ES277 CYRUSTEK | Alldatasheet
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Technical content
Features
4,000 counts LCD display LQFP 100L package 3V DC power supply Fast ADC Conversion rate : 4 times/s for V/R modes Full automatic measurement ＊ V oltage measurement : 400.0mV , 4.000V – 1000V ＊ Current measurement : μA/mA/A ＊ Resistance measurement : 400.0Ω – 40.00MΩ ＊ Capacitance measurement: 4.000nF – 40.00mF ＊ Not contact AC electric field detection ＊ Frequency counter : 400.0Hz – 40.00MHz Diode measurement & continuity check Hazardous AC/DC voltage (HV) indication (Taiwan patent no.: 517823) 4 ADP modes with external reference voltage and one user-defined segment on LCD Temperature mode with internal scale translation circuit from 0C to 0F K-type thermocouple reference table compensation (-200 ~ 1350oC range) Push functions : ＊ MAX/MIN ＊ KEY function (Switch AC/DC, oC/oF) ＊ Data Hold & Backlight function ＊ Range change function Band-gap reference voltage output Current mode overflow selection (10A/20A or 1000A/2000A) V oltage mode overflow selection ( DC / AC : 1010V , DC / AC : 610V) LCD segment check when power on Auto power off ( 30min idle time ) Sleep state indicative signal output Re-power on On-chip buzzer driver Low battery detection Description ES277 is an integrated an alog-to-digital converter with 4,000-count LCD, auto matic range selection, and 3V DC power supply. Automatic range selection is provided for ACV/DCV measurement, resistance measurement, capacitance measurement, current measurement, and frequency counter. Expensive and bulky mech anical range switches are not required. Other features include data holding, maximum and minimum value holding, diode measurement, temperature measurement, continuity checking, low battery detection, auto power off, re-power on, backlight driver and buzzer driver. Application Digital multimeter Clamp meter
V 1.1 2 2016 / 08 /16 ES277
4000 Counts DMM
100L LQFP package NC1 NC2 NC3 COFFN 97 ADP 99 CINT4 CAZ5 RAZ6 CREFP7 VR10 OHMC114 OR 115 VR 516 VR 417 VR 318 VR 219 OVSG20 VR 121 mV in22 CREFN8 VR H9 OVH24 SGND26 ADO30 TEST531 FREQ37 AL ARM38 BKOUT39 DI SDGBP41 VS T42 SLEEP43 AS EL44 BP447 BP249 BP150 ANNUNC 52 CESEL40 AC VL27 BP348 AC VH28 ADI29 NC36 BUZIN46 OVX23 SEG14 54SEG13 55SEG12 56SEG11 57SEG10 58SEG09 59SEG08 60SEG07 61 HOLD 70 SEG06 62SEG05 63SEG04 64SEG03 65SEG02 66SEG01 67MMX 68KEY 69 RANGE 71OS C1 72 OS C2 78 FC4 82FC3 83 FC5 81 BUZOUT 79 FC2 84FC1 85SLACDC 86CP 87CN 88LB AT9 89V- 90V- 91V+ 92V+ 93DGND 94AGND 95AGND 96 VR _ADP11 OHMC213 OHMC312 NC25 CAP32 CAN33 R10K34 R1K35 DI OV45 NC 51 SEG15 53 NC 73NC 74NC 75 NC 76NC 77 FC6 80 COFFP 98 IVS 100 ES277
V 1.1 3 2016 / 08 /16 ES277 Pin No Symbol Type Description 1-3 NC - Not Connected. 4 CINT O High-resolution integrator output. Connect to integrate capacitor. ( Metalized Polypropylene Film Capacitor type is recommended) 5 CAZ O High-resolution auto-zero capacitor connection. 6 RAZ O Buffer output pin in AZ and ZI phase. 7 CREFP O Positive connection for reference capacitor of A/D. 8 CREFN O Negative connection for reference capacitor of A/D. 9 VRH O Output of band-gap voltage reference. Typically –1.23V . 10 VR I Reference input voltage connection. Typically –400mV . 11 VR_ADP I Reference input voltage connection. Typically –400 mV . 12 OHMC3 O Filter capacitor connection for resistance mode. 13 OHMC2 O Filter capacitor connection for resistance mode. 14 OHMC1 O Filter capacitor connection for resistance mode. 15 OR1 O Reference resistor connection for 400.0 Ω range
16 VR5 O V oltage measurement ÷10000 attenuator(1000V)
17 VR4 O V oltage measurement ÷1000 attenuator(400.0V) 18 VR3 O V oltage measurement ÷100 attenuator(40.00V) 19 VR2 O V oltage measurement ÷10 attenuator(4.000V)
20 OVSG O Sense low voltage for resistance/voltage measurement
21 VR1 I V oltage measurement Inpu t. Connect to an accurate 10MΩ resistor. 22 mVin I Measurement input in 400.0mV mode. 23 OVX I Sense input for resistan ce / capacitance measurement. 24 OVH O Output connection for resistance measurement. 25 NC - Not Connected. 26 SGND I Signal Ground input.
27 ACVL I
Rectified signal low input in ACV/ACA mode. Connect to negative output of external AC to DC converter.
28 ACVH I
Rectified signal high input in ACV/ACA mode. Connect to positive output of external AC to DC converter. 29 ADI I Negative input of internal AC to DC OP Amp. 30 ADO O Output of internal AC to DC OP Amp. 31 TEST5 O Buffer output of OVSG . 32 CAP O Positive auto-zero capacitor connection for capacitor measurement. 33 CAN O Negative auto-zero capacitor connection for capacitor measurement. 34 R10K O Connect to a precise 10K Ω resister for capacitor measurement. 35 R1K O Connect to a precise 1K Ω resister for capacitor measurement.
36 NC - No connection
37 FREQ I Frequency counter input, offset V-/2 internally by the chip. 38 ALARM O HV signal detection in V oltage mode and EF mode indication output.
V 1.1 4 2016 / 08 /16 ES277 Pin Description ( Continued ) Pin No Symbol Type Description
39 BKOUT O
Push Hold key lager than 2 sec. to enable the back light function. This pin will change from V- to V+ and lasts for 5 minutes.. Once press Hold key lager than 1 sec. again , this pin will change level back to V-. 40 CESEL I V oltage OL selection feature control pin. (1010V/610V) 41 DISDGBP I Control warning buzzer output at HV mode. Pulled to low and buzzer is disabled.
42 VST I
In µA or mA modes, it is used to control the ‘µ’ or ‘m’ sign. Set to V- to enable clamp current mode. 43 SLEEP O Sleep mode indicator, asserts low in SLEEP mode.
44 ASEL I
Current mode OL indication for 1000/2000A (VST = V-) or 10/20A (VST = Floating) ranges 45 DIOV I Pulled to V- to set the 2.8V OL level in diode mode measurement 46 BUZIN I Pulled to V- to enable the buzzer output (BUZOUT) always. 47-50 BP4-1 O LCD backplane 4 - LCD backplane1
51 NC - Not connected
52 ANNUNC O
Square wave output at the backplane frequency, synchronized to BP1. ANNUNC can be used to control display annunciator. Connect a LCD segment to ANNUNC to turn it on; connect an LCD segment to its backplane to turn it off. 53-67 SEG15 - SEG01 O LCD segment line 01 – 14. 68 MMX I Pulse to V- to enable MAX/MIN function. 69 KEY I Pulse to V- to change mode. 70 HOLD I Pulse to V- less than 1 second. to enable HOLD function. 71 RANGE I Pulse to V- to enable manual mode and manual range selection.
72 OSC1 O Connect to 4MHz crystal oscillator
78 OSC2 I Connect to 4MHz crystal oscillator
79 BUZOUT O Outputs a 2KHz audio frequency signal for driving piezoelectric buzzer
80 FC6 I Switch 6 for function selection. 81 FC5 I Switch 5 for function selection. 82 FC4 I Switch 4 for function selection. 83 FC3 I Switch 3 for function selection. 84 FC2 I Switch 2 for function selection. 85 FC1 I Switch 1 for function selection. 86 SLACDC I Select initial DC/AC state. 87 CP O Positive capacitor connection for on-chip DC-DC converter. 88 CN O Negative capacitor connection for on-chip DC-DC converter.
V 1.1 5 2016 / 08 /16 ES277 Pin Description ( Continued ) Pin No Symbol Type Description
89 LBAT9 I
Low battery configuration. If 3V battery is used, connect it to DGND. The default low-battery threshold voltage is –2.3V . If 9V battery is used, the low battery enunciator is displayed when the voltage of this pin is less than VRH (-1.2V) 90 V- P Negative supply voltage. 91 V- P Negative supply voltage. 92 V+ O/P Output of on-chip DC-DC converter. 93 V+ O/P Output of on-chip DC-DC converter. 94 DGND P / G Digital ground. 95 AGND P / G Analog ground. 96 AGND P / G Analog ground.
97 COFFN O Offset canceled capacitor negative terminal for temperature mode
98 COFFP O Offset canceled capacitor positive terminal for temperature mode
99 ADP I Measurement input in ADP/Temp mode. 100 IVS I Measurement input in uA/mA/A current mode.
V 1.1 6 2016 / 08 /16 ES277 Supply V oltage (V- to AGND) -4V Analog Input V oltage V- -0.6 to V+ +0.6 V+ V+ ≥ (AGND/DGND+0.5V) AGND/DGND AGND/DGND ≥ (V- -0.5V) Digital Input V- -0.6 to DGND +0.6 Power Dissipation. Flat Package 500mW Operating Temperature -20 to 70 ℃℃ Storage Temperature -55℃ to 125 ℃ E l e c t r i c a l C h a r a c t e r i s t i c s T A=23oC Parameter Symbol Test Condition Min. Typ. Max Units Power supply V- 2.4 -3.0 3.3 V Operating supply current In DCV mode IDD Normal operation — 1.8 2.2 mA ISS In sleep mode — — 10 µA V oltage roll-over error REV 10M Ω input resistor — — ±0.1 %F.S 1 V oltage nonlinearity NLV Best case straight line CIL=MPR capacitor — — ±0.1 %F.S 1 Zero input reading 10M Ω input resistor -000 000 +000 counts Band-gap reference voltage V REF 100KΩ resistor between VRH and AGND -1.30 -1.23 -1.16 V Open circuit voltage for 400Ω measurement V-=-3V — -3.0 — V Open circuit voltage for other Ω measurement -1.19 -1.0 -0.85 V Internal pull-high to 0V current Between V- pin and HOLD, RANGE, KEY , FC1-FC5, MMX — 1.2 — µA AC frequency response at 4.000V range ±1% — 40-400 — HZ ±5% (No compensated) — 400-4000 — Capacitance measurement accuracy 4nF – 400uF -2.5 — 2.5 % -3 — 3 counts Capacitance measurement accuracy 4mF – 40mF -3.5 — 3.5 % 5 — 5 counts Reference voltage temperature coefficient TCRF -20 <T℃ A<70℃ — 100 — ppm/ ℃ Note: 1. Full Scale.
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- Operating Modes 1.1. Voltage Measurement A re-configurable voltage divider automatically provides a suitable range in voltage measurement mode. 400.0mV range is independent and manua l mode. It takes input signal from mVin (pin22). The other ranges take the input signal from VR1 (pin21). The following table summarizes the Full-Scale ranges in each configuration. Configuration Full Scale Range Divide r Ratio Resister Connection Input Pin VR1 400.0mV 1 - mVin V.S. SGND VR2 4.000V 1/10 VR2 (1.111M Ω) VR1 V.S. SGND VR3 40.00V 1/100 VR3 (101K Ω) VR1 V.S. SGND VR4 400.0V 1/1000 VR4 (10.01K Ω) VR1 V.S. SGND VR5 1000V 1/10000 VR5 (1K Ω) VR1 V.S. SGND Note: The VST (pin42) is used to control the voltage initial range from 4.000V or 400.0V . Set VST to V- to select the initial range at 400.0V and set VST to floating state to select the initial range at 4.000V . The ES277 support the hazardous live voltage warning. When the voltage measured exceeds the 30V , the buzzer generates 2KHz beep and ALARM (pin38) drive high output (V+ level) periodically. It can remind the user to notic e the hazardous voltage. The buzzer sound warning could be cancelled by DISDGBP (pin41). 1.1.1. OL Selection ES277 has a voltage OL sel ection feature archived by configuring the pin CESEL (pin40). In automatic voltage mode, ES277 will show OL when the voltage is exceed the overflow level. If CESEL is connected to DGND, ES277 will have a 1010V overflow level in voltage mode. If CESEL connected to V-, the overflow level will be set to 610V in DCV and ACV mode. The configuration of CESEL is listed below. For ACV/DCV voltage modes: CESEL V- DGND Floating DCV 610V 1010V 250V ACV 610V 1010V 250V
V 1.1 8 2016 / 08 /16 ES277 1.2. Current Measurement For Multi-meter ES277 has 3 automatic current measurement m odes for multi-meter. The following table summarizes the full-scale range of each mode. When ES277 operates in the current measurement modes for multi-meter, it takes high input from pin IVS (pin100), low input from pin SGND and reference voltage from VR (pin10). Mode FC1~4 Full Scale Input Terminal Automatic1 1,1,0,1 400.0µA / 4000µA IVS V .S. SGND Automatic2 1,1,1,1 40.00mA / 400.0mA IVS V .S. SGND Automatic3 0,0,0,0 4.000A /20.00A 1 IVS V .S. SGND Note: 1. Connect ASEL (pin44) to V- will set maximum readings of input for Automatic3 mode to 10.00A. 1.3. Current Measurement For Clamp-meter ES277 has 2 automatic and 4 manual current m easurement modes for Clamp meter application. The following table summarizes the Full-Scale range of each mode. When ES277 is operated in the automatic modes or the manual mode1~4, it takes high input from IVS pin, low input from SGND and reference voltage from VR. Mode FC1~4 1VST Full Scale Input Terminal Automatic1 1,1,0,1 0 400.0A / 2000A 2 IVS V .S. SGND Automatic2 1,1,1,1 0 40.00A / 999.9A IVS V .S. SGND Manual1 1,1,0,0 X 4.000A IVS V .S. SGND Manual2 1,0,0,0 X 40.00A IVS V .S. SGND Manual3 1,0,1,0 X 400.0A IVS V .S. SGND Manual4 1,0,0,1 X 1000A or 2000A 2 IVS V .S. SGND Note: 1. Connect VST to V- will disable the “µ2” / ”m2” symbol on LCD panel. 2. Connect ASEL to V- will set maximum of input for Automatic1 & Manual4 modes to 1000A.
V 1.1 9 2016 / 08 /16 ES277 1.4. Resistance Measurement A re-configurable divider automatically provides a suitable Full-Scale range in resistance measurement mode. The following table summarizes the full-scale ranges and the referen ce resistors in each configuration. Configuration Full Scale Range Relative Resistor Equivalent value OR1 400.0Ω OR1 100 Ω OR2 4.000KΩ VR5 1K Ω OR3 40.00KΩ VR4 || VR1 10K Ω OR4 400.0KΩ VR3 || VR1 100K Ω OR5 4.000MΩ VR2 || VR1 1M Ω OR6 40.00MΩ VR1 10M Ω 1.5. Capacitance Measurement The following table summarizes the eight ranges of capacitance measurement mode. Configuration1 Full Scale Range Relative Re sistor Measurement Period C13 4.000nF Ratio to C2 0.25 sec C22 40.00nF CAL 0.25 sec C3 400.0nF Ratio to C2 0.9 sec C4 4.000uF Ratio to C2 0.9 sec C5 40.00uF Internal matching 0.25 sec C6 400.0uF Internal matching 1.25 sec(max) C7 4.000mF Internal matching 2.5 sec(max) C8 40.00mF Internal matching 12.5 sec(max) Note: 1. In order to obtain an accurate reading, a capacitor must be discharged before measurement begins. The chip has a built-in discharge mode to automatically discharge the capacitor. In discharge mode, the main-display shows dIS.C. Discharging through the chip is quite slow. We recommend users to discharge the capacitor with some other apparatus. 2. The C2 range is calibrated in calibration scheme. (VR adjusted in OVX pin path) 3. The C1 range residual offset could be compensated by the small capacitors near to OVH pin.
V 1.1 10 2016 / 08 /16 ES277 1.6. Continuity Check Continuity check shares the same configuration with 400.0 Ω manual resistance measurement mode and has buzzer output to indicate cont inuity. The buzzer generates 2KHz beep and ALARM (pin 38) drive high output (V+ level) whenever the reading is less than 30 Ω. The ES277 is built in a high speed short detection circuit and the detection period could be less than 10ms. 1.7. Diode Measurement Diode measurement mode shares the same configuration with 4.000V manual voltage measurement mode and has buzzer output to indicate con tinuity. The buzzer generates a 2KHz sound and ALARM (pin 38) drive high output (V+ level) whenever the reading is less than 30mV . The source output voltage is the same as V+ terminal. If the test circuit is open or the vo ltage drop between the two ports of the diode under test is la rger than 2V or 2.8V (depends on DIOV pin level), the LCD panel will show “OL”. DIOV DGND/Floating V- OL 2.000V 2.800V 1.8. Frequency Counter The time base of the frequency counter is derived from an external crystal oscillator by Tcounter = 4,000,000 Fosc Where Fosc is the frequency of the crystal oscillator. Thus, the counter has a 1-second time base when a 4MHz oscillator is used. The frequency counter can select the proper range automatically or manually. Auto-range operation extends over six decades, from 400.0Hz to 40.00MHz. The following table summarizes the Full-Scale range of the frequency counter. Range Full Scale FR1 400.0Hz FR2 4.000KHz FR3 40.00KHz FR4 400.0KHz FR5 4.000MHz FR6 40.00MHz *If input frequency is less than 1.0Hz, ES277 will show 0.0Hz
V 1.1 11 2016 / 08 /16 ES277 1.9. Electrical field detection mode (NCV) ES277 supports a non-contact AC voltage measuremen t, which is called elect ric field measurement also. The ADC input is configured from ADP pin vs. SGND. When no or less electric field is detected, the LCD display shows “EF”. If the electric field is detected, the strength will be showed on the LCD display by “-“ not digits type. Le vel 1(equivalent to 12.5% full scal e of ADC) is “-“ and the level 4(equivalent to 100% full scale of AD C) is “----“. Additional beeper ( BUZOUT pin) and LED alarm (ALARM pin) will be output from ES277. The freque ncy of buzzer and LED alarm depends on the strength of electric field also. The Faster beeper means the stronger electric field (AC voltage) is sensed. The input voltage is taken from ADP (pin99) and the reference voltage is taken from VR_ADP (pin11) Mode FC1~4 SLACDC Full Scale Input Terminal EF 0,1,1,0 X - ADP V .S. SGND 1.10. Temperature Measurement mode Temperature measurement mode takes input signal from ADP pin and the reference voltage is taken from VR_ADP (pin11). The ES277 has ºC to ºF scale translation ci rcuit and standard K-type thermocouple reference table is built-in. External cold-junction compensation circuit is still necessary. In temperature measurement mode, automatic range (0.1 oC/1oC) is available. Auto Range ºC range Lower range: -200.0 ºC ~ 400.0 ºC (0.1oC resolution) Higher range: -200 ºC ~ 1350 ºC (1 oC resolution) ºF range Lower range: -328.0 ºF ~ 999.9 ºF(752.0 ºF in Auto range) Higher range: -328 ºF ~ 2462 ºF ADP 100M EF test circuit EFin+ SGND AGND EFin‐ 100k VRADP‐400mV
V 1.1 12 2016 / 08 /16 ES277 1.11. ADP ES277 provides 4 manual range ADP measur ement modes for user define. The ADP pin is auxiliary input terminal for ADC of ES277. The full scale for ADP mode is 400.0mV. If FC5=0, the minus sign when ADPin < 0 will not be shown on LCD segment. Mode FC1~4 SLACDC Full Scale Input Terminal ADP0 0,0,1,1 1 4000 ADP V .S. SGND ADP1 0,0,0,1 1 400.0 ADP V .S. SGND ADP2 0,1,1,1 1 40.00 ADP V .S. SGND ADP3 0,0,1,0 1 4.000 ADP V .S. SGND 1.12. Auto Power Off (APO) ES277 has a default auto power off function. If the me ter is idle for more than the given idle time duration, the chip automatically tu rns the power off. The idle time to trigger the auto power off function is fixed to 30 minutes. When APO is occu rred, the state of the meter is reserved. The APO symbol on the LCD panel indicates whether the auto power off is enabled or not. In some cases, user might want to disable APO. There is one way to disable this feature as following: 1. Power on the meter when any of the push functions, except for HOLD, is pressed down. Note: Powering on the meter while pressing HOLD and lasts 2 seconds turns on all LCD segments until HOLD is pressed again. 1.13. Sleep The meter enters sleep mode after auto power off. The SLEEP pin (pin34) asserts low (V-) in the sleep mode, and asserts high (V+, not 0V) after re-power on. 1.14. Re-Power On After auto power-off (APO occurred), pushing any of the push function or changing the rotary mode can turn on the meter again. If the meter is re-powered on by changi ng the rotary mode, the saved state is cleared. If the mete r is re-powered on by push functions , the chip restores the saved state and enters HOLD mode. The LCD displays the saved value.
V 1.1 13 2016 / 08 /16 ES277 1.15. Hazardous Voltage Indication The ES277 could provide the AC/DC hazardous vol tage indication for voltage/resistor/ diode modes. Of course, the indication could support LCD symbol / LED ( ALARM pin) /Buzzer driving (Buzzer could be disabled by DISDGBP pin) simultaneously. Especially ES277 could detect the AC voltage in DCV mode and detects the DC voltage in ACV mode. It means if not proper AC or DC voltage signal exists on the devi ce under test when DCV or ACV measurement mode is set, the HV indication will be active. HV indication criterion Function / Range DC voltage (typ.) AC voltage (typ.) AC mV > + 3V OL AC 4V > + 20V OL AC 40V – 1000V > + 100V > 30Vrms DC mV OL > 3Vrms (40-1kHz) DC 4V OL > 20Vrms (40-1kHz) DC 40V-1000V > + 30V > 90Vrms (40-1kHz) Freq. mode > + 70V > 40Vrms (40-1kHz) Res/Cap/Diode modes > + 10V > 10Vrms (40-1kHz) Note: If AC+DC signal is applied, the voltage criterion will be changed.
V 1.1 14 2016 / 08 /16 ES277 1.16. Low Battery Voltage Detection ES277 provides a voltage detection input (pin 89: LBAT9) for non-3V battery application. When LBAT9 is less than VRH terminal voltage, the LCD segment of low battery will appear. For 3V battery application, pull LBAT9 to DGND directly and the same detecti on will be made when V- is less than 2.3V typ.. When the Low battery status lasts for 10 seconds, the LCD segment of low battery will be blinking. When the symbol is blinking for 20 seconds , the operation of meter will be inhibited and LCD panel will show “ Lo.bt”. In this case, it is suggested to replace a new battery immediately. After “Lo.bt” appears and lasts for 60 seconds, ES277 will enter to auto power off mode. Low battery test ( 9V battery) 680K 270K BAT LBAT9 AGND 0.1u
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- Measurement Mode Switching Measurement mode depends on the logic level of SLACDC, FC1, FC2, FC3, FC4, FC5 and KEY selection. When FC5 is high, the measurement mode list is shown below: SLACDC FC6 FC1 FC2 FC3 FC4 Mode KEY selection 0 1 1 0 1 1 Auto DC V oltage Measurement DCV ↔ ACV 0 1 1 1 0 1 Auto DC Current Measurement(µA) DCuA ↔ ACuA 0 1 1 1 1 1 Auto DC Current Measurement(mA) DCmA ↔ ACmA 0 0 1 1 1 1 Capacitance Measurement ---- 0 1 0 0 0 0 Auto DC Current Measurement(A) DCA ↔ ACA 0 1 1 1 1 0 AC/DC V oltage Scan mode Scan AC DC Scan 0 1 1 1 0 0 3Manual DC 4.000A DCA ↔ ACA 0 1 1 0 0 0 3Manual DC 40.00A DCA ↔ ACA 0 1 1 0 1 0 3Manual DC 400.0A DCA ↔ ACA 0 1 1 0 0 1 3Manual DC 2000A DCA ↔ ACA 0 1 0 0 1 1 Resistance Measurement Ω ↔ Continuity 0 1 0 0 0 1 Continuity Check Continuity ↔ Diode 0 1 0 1 1 1 Resistance Measurement Ω Continuity Diode 0 1 0 0 1 0 Frequency Measurement ---- 0 1 0 1 1 0 NCV (EF mode) ---- 0 1 0 1 0 0 Auto Temperature Measurement ( ℃) ↔ ℃℉ 0 1 0 1 0 1 DCmV DCmV ↔ ACmV 1 1 1 0 1 1 Auto AC V oltage Measurement ACV ↔ DCV 1 1 1 1 0 1 Auto AC Current Measurement(µA) ACuA ↔ DCuA 1 1 1 1 1 1 Auto AC Current Measurement(mA) ACmA ↔ DCmA 1 1 0 0 0 0 Auto AC Current Measurement(A) ACA ↔ DCA 1 1 1 1 1 0 AC/DC V oltage Scan mode Scan AC DC Scan 1 1 1 1 0 0 3Manual AC 4.000A ACA ↔ DCA 1 1 1 0 0 0 3Manual AC 40.00A ACA ↔ DCA 1 1 1 0 1 0 3Manual AC 400.0A ACA ↔ DCA 1 1 1 0 0 1 3Manual AC 2000A ACA ↔ DCA 1 1 0 0 1 1 1 1 0 0 0 1 1 1 0 1 1 1 1 1 0 0 1 0 1 1 0 1 1 0 NCV (EF mode) ---- 1 1 0 1 0 0 Auto Temperature Measurement(℉) ℉↔℃ 1 1 0 1 0 1 ACmV ACmV ↔ DCmV Note: 1. When FC5 is high, the ADP0, ADP1, ADP2 and ADP3 modes can display minus sign. 2. These modes could be designed for multimeter current modes, please refer to section 1.2. 3. These modes could be designed for clampmeter current modes, please refer to section 1.3.
V 1.1 16 2016 / 08 /16 ES277 Measurement Mode Switching (Continued) Measurement mode depends on the logic level of SLACDC, FC1, FC2, FC3, FC4, FC5 and KEY selection. When FC5 is low, the KEY function is disabled in most modes. The measurement mode list is shown below: SLACDC FC6 FC1 FC2 FC3 FC4 Mode KEY operation is not available 0 1 1 0 1 1 Auto DC V oltage Measurement ---- 0 1 1 1 0 1 Auto DC Current Measurement(µA) ---- 0 1 1 1 1 1 Auto DC Current Measurement(mA) ---- 0 0 1 1 1 1 Capacitance Measurement ---- 0 1 0 0 0 0 Auto DC Current Measurement(A) ---- 0 1 1 1 1 0 AC/DC V oltage Scan mode ---- 0 1 1 1 0 0 3Manual DC 4.000A ---- 0 1 1 0 0 0 3Manual DC 40.00A ---- 0 1 1 0 1 0 3Manual DC 400.0A ---- 0 1 1 0 0 1 3Manual DC 2000A ---- 0 1 0 0 1 1 Resistance Measurement ---- 0 1 0 0 0 1 Continuity Check ---- 0 1 0 1 1 1 Diode Measurement ---- 0 1 0 0 1 0 Frequency Measurement ---- 0 1 0 1 1 0 NCV (EF mode) ---- 0 1 0 1 0 0 Auto Temperature Measurement(℃) ---- 0 1 0 1 0 1 DCmV ---- 1 1 1 0 1 1 Auto AC V oltage Measurement ---- 1 1 1 1 0 1 Auto AC Current Measurement(µA) ---- 1 1 1 1 1 1 Auto AC Current Measurement(mA) ---- 1 1 0 0 0 0 Auto AC Current Measurement(A) ---- 1 1 1 1 1 0 AC/DC V oltage Scan mode ---- 1 1 1 1 0 0 3Manual AC 4.000A ---- 1 1 1 0 0 0 3Manual AC 40.00A ---- 1 1 1 0 1 0 3Manual AC 400.0A ---- 1 1 1 0 0 1 3Manual AC 2000A ---- 1 1 0 0 1 1 1 1 0 0 0 1 1 1 0 1 1 1 1 1 0 0 1 0 1 1 0 1 1 0 NCV (EF mode) ---- 1 1 0 1 0 0 Auto Temperature Measurement(℉) ---- 1 1 0 1 0 1 ACmV ---- Note: 1. When FC5 is low, the ADP0, ADP1, ADP2 and ADP3 modes can’t display minus sign. 2. These modes could be designed for multi-meter current modes, please refer to section 1.2. 3. These modes could be designed for clamp-meter current modes, please refer to section 1.3.
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- Push Function All the enabled push functions will be reset wh en the measurement mode is changed when FC1-FC6 modes are changed. The following table lis ts the available function versus every measurement mode. Note: 1Include automatic μA, automatic mA and manual A modes, please refer to section 1.2. 2Include 2 automatic modes and 4 manual modes, please refer to section 1.3. 3Push HOLD key and last for 2 seconds will active the back light output driver (BKOUT). 4Only available at auto range mode MMX KEY HOLD/BKLIT 3 RANGE Voltage mode O O O O mV mode O O O X 1Current Mode for Multimeter O O O O 2Current Mode for Clampmeter O O O O 4 Resistance O O O O Continuity O O O X Capacitance O X O O Diode mode O O O X Frequency X X O O Temperature O O O O 4 EF Mode X X O X ADP mode O O O X
V 1.1 18 2016 / 08 /16 ES277 3.1. Range Push RANGE1 key to switch from automatic to manual mode, and while in manual mode, changes the full-scale range. The following figure shows the state transition. Automatic Mode Manual Mode 1 push < 1 sec 1 push > 1 sec 1 push < 1 sec Range up Measurement Mode Auto Manual Control Range Initial Range V VR2 – VR5 VRi → VRi + 1, VR5 → VR2 4.000V – 1000V 4.000V 1 Auto µA IR1 – IR2 IR1 → IR2, IR2 → IR1 400.0µA – 4000µA 400.0µA Auto mA IR1 – IR2 IR1 → IR2, IR2 → IR1 40.00mA – 400.0mA 40.00mA Auto A IR1 – IR2 IR1 → IR2, IR2 → IR1 4.000A – 20.00A2 4.000A Auto 40A/1000A (clamp) IR1 – IR2 IR1 → IR2, IR2 → IR1 40.00A – 999.9A 40.00A Auto 400A/2000A (clamp) IR1 – IR2 IR1 → IR2, IR2 → IR1 400.0A – 2000A2 400.0A Ω OR1 – OR6 ORi → ORi + 1, OR6 → OR1 400.0Ω – 40.00MΩ 400.0 Ω Temp T1-T2 T1T2 T2T1 400.0oC-1350oC 400.0 oC Capacitance C1-C8 Ci Ci +1 C8 C1 4.000nF – 40.00mF 4.000nF Frequency FR1 – FR7 FRi → FRi + 1 FR7 → FR1 400.0Hz – 40.00MHz 400.0Hz Note: 1. Initial range of voltage mode depends on VST pin configuration 2. OL level is set by ASEL pin
V 1.1 19 2016 / 08 /16 ES277 3.2. HOLD and BKOUT output Feature HOLD mode makes the meter stop updating the LCD pane l. This mode can be nested in most of the special modes. Enabling HOLD function in au tomatic mode makes the meter switch to manual mode, but the range remains the same. ES277 provi des a backlight output fe ature. To activate backlight output feature, press down the HOLD key and last for 2 seconds. The meter will enable output from BKOUT. 3.3. KEY See Section “Measurement Mode Switching” for the function of this pin. 3.4. Max/Min + HOLD The meter displays the maximum or minimum value of the input in Max/Min mode. When MMX key is pressed for the first time, the meter disp lays the maximum value. The meter displays the minimum value, when it is pressed again. When MMX key is pressed for the third time, the meter displays current value. The mete r returns to normal operation if MMX is pressed and held for longer than one second. Pressing HOLD in Max/Min mode makes the me ter stop updating the maximum or the minimum value. Original state (Automatic/manual) “MAX” active max value “MIN” active min value hold max value. hold min value. Push HOLD Push HOLD 1 push<1 sec 1 push<1 sec 1 push>1 sec 1 push>1 sec 1 push<1 sec
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- Miscellaneous The conditions, which the meter turns on the buzzer, include: (1) Changing measurement mode generates one beep. (2) Pressing any of the push functions genera tes one beep, if the function is valid. (3) Power on and re-power on generate one beep. (4) Input overflow in voltage and current mode generates one beep every 0.3 seconds (or 3.33 beeps per second.) (5) Hazard voltage indication is ac tive generates one beep per second and could be disabled by DISDGBP pin. (6) Continuity(diode) check generates a continuous 2KHz beep whenever the measurement is less then 30Ω(30mV) (7) Auto power off generates a 2KHz beep which lasts for 1.5 seconds. The following figures show the output waveform from the BUZOUT pin. 0.5 mS (a) Continuous 2KHz beep 0.3 sec 0.15 sec (b) 3.33 beep/sec
V 1.1 21 2016 / 08 /16 ES277 4.1. LCD Panel S01 S02 S03 S04 S 05 S06 S07 S08 S09 BP1 MANU AUTO SCAN 4B 3A 3B 2A 2B 1A BP2 APO AC 4A 4G 3F 3G 2F 2G 1F BP3 DANGE MINUS 4F 4C 3E 3C 2E 2C 1E BP4 LBAT DC 4E 4D DP3 3D DP2 2D DP1 S10 S11 S12 S13 S14 S15 BP1 1B BUZZER HOLD μ2 M n BP2 1G DIODE MAX m2 K μ1 BP3 1C ℃ MIN V Ω m1 BP4 1D ℉ ADP A Hz F LCD Backplane Waveform BP1 BP2 BP3 BP4 V‐ +3.1 V‐ +3.1 V‐ +3.1 V‐ +3.1
V 1.1 22 2016 / 08 /16 ES277 4.2. LCD Display On Condition LCD Annunciator Condition V In voltage measurement mode, and diode measurement mode. A In current measurement mode. Ω In resistance measurement mode, and continuity mode. In continuity check mode. In diode mode. F In capacitance measurement mode. m1 In capacitor measurement mode and the fu ll scale range is in the order of mF. µ1 In capacitor measurement mode and the fu ll scale range is in the order of uF. n In capacitor measurement mode and the fu ll scale range is in the order of nF. Hz In frequency mode. ADP When ADP0-3 mode is active. DC In DC voltage or DC current mode. AC In AC voltage or AC current mode. AUTO When automatic full scale range selection is enabled. MANU In manual mode. HOLD When HOLD function is enabled. MAX When MAX function is enabled. MIN When MIN function is enabled. m2 In voltage or current measurement mode and the full scale range is in the order of 10 -3. µ2 In current measurement mode and the fu ll scale range id in the order of uA. M In resistance measurement mode and th e full scale range is in the order of MΩ. K In resistance measurement mode and th e full scale range is in the order of KΩ. ℃ In temperature measurement mode and when the unit is ℃. ℉ In temperature measurement mode and when the unit is ℉. When the reading is exceeding default hazardous live voltage or OL in DCV or ACV , the HV warning symbol will be display. APO When auto power off function is enabled. LBAT When battery voltage is too low SCAN When ACV/DCV scan mode is selected
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4.3 Operating Timing
ES277 incorporates a dual slope ADC with four phases: ZI, AZ, INT and DINT. The timing of each phase are listed below. (1) V oltage / Diode /ADP / Manual Current (for clampmeter) measurement: Phase High resolution ZI 20ms AZ 20ms INT 100ms DINT 110ms (2) Current mode for multimeter/Auto Current mode for clampmeter/2-range auto voltage mode: Phase DC / AC DC Lower Range DC/AC 999.9A ZI 50ms 20ms 20ms AZ 25ms 20ms 20ms INT 100ms 1000ms 100ms DINT 110ms 110ms 260ms (3) Continuity / Ohm measurement: Phase Time ZI 20ms AZ 20ms INT 25ms DINT 185ms (4) Frequency : Every conversion takes 1.05 second. (5) Temperature measurement: Phase Time ZI 20ms AZ 20ms INT 500ms DINT 210ms Note: 1. In the frequency measurement with auto mode, if the range is changed, the internal clock rate will increase ten times and the new measurement cycle becomes 1/10 times of the original cycle until the range is stable.
V 1.1 24 2016 / 08 /16 ES277 Application Circuit 1. A VG Circuit (ES277 dice form only) 123456 A B C D 6 5 4 3 2 1 D C B A Title Number RevisionSize B Date: 31-May-2016 Sheet of File: D:\\Protel 99\\Protel file\\KA055\\KA055.ddb Drawn B y: ES277 ( AVG ) Demo Board Circuit Jack Chang ES277 SW9 FC5 SW10 FC4 SW7 SLACDC FC4 FC5 SLACDC V - SW11 FC3 SW12 FC2 SW13 FC1 FC1 FC2 FC3 SW18 MAXMIN MMX V - SW19 KEY SW20 HOLD HOLD KEY SW1 uA SW3 mA uA/mA uA mA A R15 0.99R16 0.01 BZ1 Buzzer V - R1 10K R2 10K BU Z OU T 2N 3906D5 BKOUT R4 100K V - BK OUT R9 100 HV R5 100K V - AL ARM R10 100 2N 3904 2N 3904 + C3 10uF + C4 10uF ZR 2 7.5V V + C6 0.1uF C5 0.1uF ZR 1 5.6V SW2 Pow er S witch V - Bat- Ba t+ Metallized Polyester Capacitor : C11 R7 100K SW17 EF Mode ADP mVin Q112N 2222 Q102N2222 R26 2.2K PTC OVX R27 2.2K PTCOVH R31 10M / 1000V R8 100K Q72N 2222 Q62N2222 Q92N 2222 Q82N2222 C18 220pF Close t o IC R38 200 C10 1uF Q42N3904 Q122N2222 FREQ R37 200 R39 200K SW14 mVin SW24 FREQ DISDG BP BUZIN VS T BUZOUT BK OUT AS EL SEG12 SEG13 SEG14 SEG08 SEG09 SEG10 SEG11 SEG04 SEG05 SEG06 SEG07 SEG03 SEG02 SEG01 BP4 BP3 BP2 BP1 CE SEL AL ARM 4M Hz KE Y ANNUNC FC 5 HOLD FC 2 FC 3 FC 4 FC 1 MMX IVS SLACDC ADP V - V + LBAT9 470nF C12 220nF 10% C11 220nF 10% C13 220nF 10% VRH R20 99.7 R21 1K R22 10.01 R23 101K R24 1.111M OVSG SLEEP SW5 ADP SW6 Te mper ature Pr ecisi on Resist ors VIN R19 56KR34 100K VR 4 10 K +C16 4.7uF R18 56KR33 24K VR 3 10 K +C15 4.7uF R17 56KR32 24K VR 2 10 K +C14 4.7uF V/R/TEMP COM IVS mVin OVX OVH VIN R6 100K EF V - BT1 DC 3.0V Precision Resistors
7 Cop per A rea
TEMP_COM SGND For Temper at ure For DMM LM 385_1.25V R30 V + Q14 2N3904 R13 15K R14 20K R12 100 VR 1 200 R29 10M R11 300 DIP 2N3904 Close to Input TEMP_COM R28 1M R25 40M ~ 60M SW16 Temperature Mode Q5 2N2222 CINT 1 CAZ 2 RAZ 3 CREFP4 CREFN5 VR H 6 VR 7 OHMC210 VR 4 14 VR 3 15 VR 2 16 OVSG 17 VR 1 18 mV in 19 OVX 20 OVH 21 SGND22 VR _ADP8 OHMC39 AC VH24 ADO26 R10K30 R1K31 DI SDGBP36 VS T37 SLEEP38 DI OV40 BUZIN41 BP442 BP343 ANNUNC46 SEG1448 SEG1349 SEG1151 AS EL39 TEST527 SEG1547 CAP28 CAN29 CESEL35 BP145 AC VL23 SEG0953 SEG0854 SEG0755 SEG0656 SEG0557 SEG0458 SEG0359 SEG0260 FC 5 70 SEG0161 MM X62 KE Y63 HOLD64 OS C166 OS C2 67BUZOUT 68FC 6 69 FC 4 71FC 3 72 LB AT9 78 V+ 82V+ 83 V- 81 V- 79 DGND 84AGND 85AGND 86 ADP 89IVS 90 OHMC111 VR 5 13OR 1 12 ADI25 NC FREQ32 ALARM33 BKOUT34 BP244 SEG1250 SEG1052 FC 2 73FC 1 74SLACDC 75CP 76CN 77 V- 80 COFFP 88 COFFN 87 NC RANGE65 NC ES277 RANGE SW21 HOLD RANGE ACVL ACVH ADO ADI TEST5 D2 D1 D4 D3 C9 1uF C8 33nF C7 22nF C17 470nF 10% DIOV R36 1K R35 10K SEG15 FC 6 SW8 FC6 FC6 Pr ecisi on R esist ors C1 470nF R40 10K R41 15K R42 15K TEST5 ADI ACVH ACVL +C 2 0 1uF+ C21 1uF C19 0.1uF R44 56K R43 56K D9 1N 4148 D7 1N 4148 VR 7 10K C22 10uF ADO Option R45 200K VR 5 50K
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Package Information
100L LQFP Outline drawing Dimension parameters