SC7001Q SILAN | Alldatasheet
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HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.2 2007.12.26 Http: www.silan.com.cn Page 1 of 17 QFP-80-14×20-0.8 33/4 DIGITS LCD DISPLAY ,3260-COUNT A/D FOR DMM
DESCRIPTION
The SC7001Q is a low power CMOS dual-slope A/D converter with 3 3/4-digit numeric and 33-segment ba r-graph LCD display driver, auto- ranging, and single 3V battery operation. It is ideal for high performance auto-range DMM applications with 3260 counts full-scale. The SC7001Q provides many user function: Manual Range Hold/Data Hold/Auto Power-off/Voltage/Curre nt/Resistance measurement/Diode Test/Continuity Check(Beeper). The built-in high temperature-stable CMOS bandgap reference and a CMOS Op Amp for ac-to-dc conversion are economical of saving external components. In addition, the voltage doubler enables a high performance digital multimer to be built with single 3V power supply operation.
FEATURES
- Auto range function --Voltage (DC/AC):326.0mV(NA for AC), 3.260V, 326.0V, 3260V -- Current (DC/AC): 326.0μA, 3260μA, 32.60mA, 326.0mA, 10A * Triplex LCD driver including decimal points, bargraph, and annunciators * Low power consumption: less than 1.8mW. * 3V battery operation. * Internal voltage doubler, ac-to-dc conversion Op Amp. * Range Selection/Display Hold/Auto Power-off/Diode Test/Continuity Check(Beeper) function * Built-in CMOS bandgap reference.
ORDERING INFORMATION
Part no. Package SC7001Q QFP-80-14X20-0.8
APPLICATIONS
∗ Hand-held DMM * Pocket DMM * Pen-type DMM
- Analog block 2. Digital block HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.2 2007.12.26 Http: www.silan.com.cn Page 2 of 17
HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.2 2007.12.26 Http: www.silan.com.cn Page 3 of 17 ABSOLUTE MAXIMUM RATING (note1) Characteristics Symbol Value Unit Supply Vltage (VDD to A COM) VDD 4 V Supply Vltage (VSS to A COM) VSS -4 V Digital Input Voltage DVIN -0.3~VDD+0.3 V Analog Input Voltage AVIN VSS-0.3~VDD+0.3 V Digital Output Current DIOUT -1~+1 mA Analog Output Current AIOUT -3~+3 mA Beep Output Current IBEEP -1~+1 mA LCD Output Current ILCD -0.1~+0.1 mA Operating Temperature Range TOPR 0~+50 °C Storage Temperature Range TSTG -40~+125 °C Note: 1. All voltage are measure with respect to the A COM, unless otherwise noted. The separate A GND, D GND and A COM should always be wired together. RECOMMENDED OPERATING CONDITIONS Value Characteristics Symbol Min. Typ. Max. Unit Supply voltage VDD 2.4 3.0 3.6 V Supply voltage VSS -2.4 -3.0 -3.6 V Digital input “L” voltage DVIL 0.5 V Digital input “H” voltage DVIH VDD-0.5 V Reference input voltage REF IN 0.32768 V LCD-ON drive voltage VLCD-ON 2.5 V LCD-OFF drive voltage VLCD-OFF 1.3 V Operating temperature range Topr 0 50 °C Clock frequency f 32.768 KHz ELECTRICAL CHARACTERISTICS (Tamb=25°C, VDD=3V, REF IN=0.32768V, f =32.768KHz,unless otherwise specified) Characteristics Symbol Test conditions Min. Typ. Max. Unit Supply current IDD At DCV mode, V IN=0mV with voltage doubler operated 600 μA Power-off supply current IPO At power off(down) 0 4.0 μA Digital input “H” current IIH VIH =3V -1.0 +1.0 μA Digital input “L” current IIL VIL=0V -10 μA Measuring pin leakage ILEAK -10 +10 pA Digital input “H” voltage VIH 2.5 V Digital input “L” voltage VIL 0.5 V (To be continued)
HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.2 2007.12.26 Http: www.silan.com.cn Page 4 of 17 (Continued) Characteristics Symbol Test conditions Min. Typ. Max. Unit Built-in reference voltage output range REF OUT 1.1 1.28 1.4 V Built-in reference voltage output voltage coefficient ΔREF OUT VDD=2.4~3.6V -2000 +2000 ppm/V Battery check internal comparator off-set voltage VBATT On pin 47 voltage -60 +60 mV LCD-on drive voltage VLCD-ON 2.5 V LCD-off drive voltage VLCD-OFF 1.3 V DCV measurement ERR-DCV -0.08 +0.08 %/FS DCA measurement ERR-DCA -0.15 +0.15 %/FS ACV measurement ERR-ACV -0.1 +0.1 %/FS ACA measurement ERR-ACA -0.2 +0.2 %/FS Except 32.6MΩ -0.08 +0.08 %/FS Resistance measurement ERR-R 32.6MΩ range -0.5 +0.5 %/FS Diode test ERR-D Full-scale =2.0V -0.2 +0.2 %/FS Linearity Option measurement ERR-OPT -0.08 +0.08 %/FS Beep out frequency fBEEP 4095 4096 4097 Hz Continuity check value RCC 18.3 20.7 Ω AC-to-DC conversion Amp gain AV Input range = -1~1v 70 dB O.L display count D O.L 3240 3290 count
HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.2 2007.12.26 Http: www.silan.com.cn Page 5 of 17
HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.2 2007.12.26 Http: www.silan.com.cn Page 6 of 17 PIN DESCRIPTION PIN No. Symbol Description
1 BP1 Backplane 1 of LCD display
2~27 SDP1~SDP26 Segment display
28 LOWBAT Low battery check voltage input
29 PWRMON Power monitor output
30 AUTO PWR1 Auto power ON/OFF selection 1
31 AUTO PWR2 Auto power ON/OFF selection 2
32 VDD Supply voltage
33 CINTH High-speed A/D integrating capacitor connection
ZERO(H) High-speed A/D auto zero capacitor connection
35 RINTH(H) High-speed A/D integrating resistor connection(H)
36 RINTH(L) High-speed A/D integrating resistor connection(L)
37 A COM Analog circuit reference voltage
38 REF IN Reference voltage input
39 AC AMP OUT Built-in AC Amp output
40 AC AMP IN(-) Built-in AC Amp negative input
41 AC CKT IN (+) AC measurement position input
42 CFILT OUT Output pin for external filter
43 CFILT IN Input pin for external filter
44 AC CKT IN(-) AC measurement negative input
45 A GND Analog ground
46 NC No connection. This pin should be open in normal operation
47 REF OUT Built –in bandgap reference voltage output
48 CINTL Low-speed A/D integrating capacitor connection
ZERO(L) Low-speed A/D auto zero capacitor connection
50 RINTL(L) Low-speed A/D integrating resistor connection (L)
51 RINTL(H) Low-speed A/D integrating resistor connection (H)
52 R MEAS IN Resistor and current measurement input
53 D MEAS IN Diode and current of high range measurement pin
54 I MEAS IN Input for current measurement
55 V MEAS IN Input for voltage measurement
56 1.1111MΩ Voltage measurement ÷ 10 attenuator(326.0kΩ range) 57 101.01KΩ Voltage measurement ÷ 100 attenuator(32.60kΩ range) 58 10.010 KΩ Voltage measurement ÷ 1000 attenuator(3.260kΩ range) 59 1.0001KΩ Voltage measurement ÷ 1000 attenuator(326.0Ω range) 60 10.000MΩ Resistance measurement 3.260MΩ range
61 RREF COM Attenuator resistor common connection
62 VSS Negative supply voltage connection of analog circuit
(To be continued)
(Continued) PIN No. Symbol Description
63 D GND Digital ground
64~72 F1~F9 Function input pin 1~9
73 CVD OUT Voltage double output
74 CVD(-) Voltage double capacitor connection (-)
75 CVD(+) Voltage double capacitor connection(+)
76 OUT Beep frequency output (4096Hz)
77 OSC OUT X-tal connection (32.768KHz)
78 OSC IN X-tal connection
79 BP2 Backplane 2 of LCD display
80 BP3 Backplane 3 of LCD display
- SC7001Q INTEGRATING DUAL-SLOPE A/D CONVERTER The SC7001Q consists of a low-speed A/D and a high-speed A/D conversion circuit. Low-speed A/D conversion circuit When an analog DC input signal under 320mV is applied, the low-speed conversion proceeds like a sequence of AUTO ZERO (A.Z)→INTEGRATION (INT) →DEINTEGRATION (DEINT) → AUTO ZERO. One conversion takes 519.7ms is the voltage measurement mode. The counter data of DEINTEGRATION interval is transferred to the LCD and the output value is determined. High-speed A/D conversion circuit Range selection and barograph display operate by the high-speed conversion which is like that of low-speed A/D conversion. One conversion takes 80ms in the voltage measurement mode. Waveform and block diagram of dual-slope A/D converter (Negative input) Conversion time Tim Speed T1 T2 T3 Conversion time T1+T2+T3 Low-speed A/D 100ms 200ms 219.7ms(109.8ms)* 519.7ms(409.8ms) High-speed A/D 40ms 20ms 20ms(10ms) 80ms(70ms) * : The value of parenthesis is for current measurement mode. HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.2 2007.12.26 Http: www.silan.com.cn Page 7 of 17
- VOLTAGE MEASUREMENT In the voltage measurement mode, i nput impedance is very high because input signal is applied to the integrator through a internal buffer amplifier. Ranges are automatically changed by internal switch select a proper route and attenuate an unknown voltage input to the ratio of 1/1, 1/ 10, 1/100, 1/1000, 1/10000. 1.1111M Ω, 101.10K Ω, and 1.0001K Ω of attenuator resistors are connected to 10MΩ resistor tandemly. Range Attenuator (in tandem) Attenuation ratio Resolution 326.0(R1) 10 1 0.1mV 3.260(R2) 10M&1.1111MΩ 1/10 1 mV 32.60(R3) 10M&101.01KΩ 1/100 10 mV 326.0(R4) 10M&10.01KΩ 1/1000 100 mV 3260(R15) 10M&1.0001KΩ 1/10000 1V Counter Timer Rint Vout INT 3277 200.0ms 327kΩ (Vin • Tint)/(R • Cint) DEINT 3600 219.7ms 327 kΩ VOUT-(Vref •Tdeint)/(R• Cint) 3. CURRENT MEASUREMENT Input terminals consist of μA, mA, and 10A ranges consist of two auto ranges according to the level of the input. Input terminal Range Internal switch Attenuation ratio Resolution μA 326.0μA 3260μA S S 0.1μA 1μA mA 32.60 mA 326.0 mA S S 10μA 1μA 10A 10A S HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.2 2007.12.26 Http: www.silan.com.cn Page 8 of 17
INT 3277 200.0ms 327kΩ DEINT 3600 109.8ms 327kΩ VOUT-(Vref •Tdeint/2)/(R• Cint) 4.RESISTANCE CONTINUITY MEASUREMENT In the resistance measurement mode, each attenuation resistor is connected to a 10MΩ resistor parallelly. DUAL SLOPE A/D INT R MEAS IN REF IN 1.28V 10M 100K 900K Rx Rk s DEINT Range Counter Time Rint Except 32.60MΩ INT DEINT 3277 3600 200.0ms 129.7ms 327 kΩ 1 MΩ Resistance
32.60 MΩ INT
186.0ms 219.7ms 1 MΩ 327 kΩ Continuity Same as 326.0Ω range 5. DIODE TEST In the diode test mode, if an input voltage is over 2.01V(201counts) then “O.L” is displayed in the LCD and any more measurement is impossible. HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.2 2007.12.26 Http: www.silan.com.cn Page 9 of 17
- When F5=0 No F2 F1 F4 F3 F9=1/ F9=0 R1, DP1 R2, DP3 R3, DP2 R4, DP1 R5, DP3 R32M, DP2 Remark 1 0 0 0 0 DC/AC VOLT • • • • • × TPD 2 0 0 0 1 DC/AC VOLT • • • • • × 3 0 0 1 0 DC/AC VOLT • • • • • × 4 0 0 1 1 OHM/Contiuity • • × × × × F8=0,F9:T 5 0 1 0 0 OPTION only × × × × × × 326m VOLT 8 0 1 1 1 Contiuity /Diode F9=1, F7:T 9 1 0 0 0 LCD test × × × × × × Display 1999 10 1 0 1 0 CD/AC VOLT • • • • • ×
- • • • • • F6=1 11 1 0 1 1 OHM 12 1 1 0 0 OPTION × × × × × × 326m VOLT 13 1 1 0 1 DC/AC mA × × • • × × 14 1 1 1 0 DC/AC μA × × × • • × 15 1 1 1 1 DC/AC VOLT • • • • • × * R1~R5: Range 1~Range 5. * R32M: R32M is 32MΩ range of resistance measurement. * DP1~DP3: Dot point 1, 2, 3 on the LCD. * F7: Manual Range Hold (to release ‘RH’, F7=0 during over 1sec). * F8: Data Hold (by toggling). * F5: Mode can be changed by a toggle switch with F9 (F9=1→0) when F5=0. Mode can be changed by a touch switch with F9 (F9=1→0→1). * TPD: Auto power off time (10 minutes). * F1~F9: Initial state using internal pull up (DC 326.0mV Range) . So every function pin (F1~F9) is “1” state unless certain input is given. * T: Toggle. 2. When F5=1 No F2 F1 F4 F3 F9=1/ F9=0 R1, DP1 R2, DP3 R3, DP2 R4, DP1 R5, DP3 R32M, DP2 Remark 16 0 0 0 0 DC/AC VOLT • • • • • × TPD 17 0 0 0 1 DC/AC VOLT • • • • • × 18 0 0 1 0 DC/AC VOLT • • • • • × CONTINUITY • × × × × × F9:T 19 0 0 1 1 CONTINUITY • × × × × × 20 0 1 1 1 HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.2 2007.12.26 Http: www.silan.com.cn Page 10 of 17
- Auto power off function Power turned off by 10 minutes unless input value changed within a defined time. * This function selected as follows. Auto PWR1(Pin30) + Auto PWR2(PIN31) 0+0 1+0 0+1 1+1 POWER Power on Auto power off Off Off 4.Full display value according to mode Mode R1 R2 R3 R4 R5 R32M DC 326.0mV 3.260V 32.60V 326.0V 3260V Voltage AC 3.260V 32.60V 326.0V 3260V mA 32.60mA 326.0mA Current (AC/CD) μA 326.0μA 3260μA DP3 of R4 is not displayed under voltage, current mode. LCD DRIVE WAVEFORM BACKPLANE 1 BACKPLANE 2 BACKPLANE 3 SEGMENT ON SEGMENT OFF D GND D GND 256/6=42.67Hz HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.2 2007.12.26 Http: www.silan.com.cn Page 11 of 17
TRIPLEXED LCD DISPLAY FORMAT BP NO IC PIN NO 2 3 4 5 6 7 8 9 10 11 12 13 14 BP2 79 p31 Ω K d0 p30 dp1 d1 p29 dp2 d2 p28 dp3 BP3 80 p32 V M c0 g0 e0 c1 g1 e1 c2 g2 e2 c3 BP1 1 p33 R-H m b0 a0 f0 b1 a1 f1 b2 a2 f2 b3 BP NO IC PIN NO 15 16 17 18 19 20 21 22 23 24 25 26 27 BP2 79 d3 AC p27 p22 p21 p16 p15 p10 p9 p4 p3 p- BP3 80 e3 ⎯ D-H p26 p23 p20 p17 p14 p11 p8 p5 p2 p0 BP1 1 a3, DC p25 p24 p19 p18 p13 p12 p7 p6 p1 HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.2 2007.12.26 Http: www.silan.com.cn Page 12 of 17
TYPICAL APPLICATION CIRCUIT HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.2 2007.12.26 Http: www.silan.com.cn Page 13 of 17
HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.2 2007.12.26 Http: www.silan.com.cn Page 14 of 17 COMPONENT VALUE No Value Unit No Value Unit R1 9900 KΩ C1 0.022 μF R2 909 KΩ C2 0.022 μF R3 100 KΩ C3 10 μF R4 900 KΩ C4 10 μF R5 1.1 MΩ C5 10 pF R6 101.01 KΩ C7 0.015 μF R7 10.01 KΩ C8 0.22 μF R8 1.001 KΩ C9 10 μF C10 0.1 μF R9 10 MΩ C11 0.0068 μF R10 100 KΩ C12 0.15 μF R11 470 KΩ C13 1 μF R12 0.1 MΩ C14 10 μF R13 100 KΩ VR1 20 KΩ R14 160 KΩ VR2 200 KΩ R15 150 KΩ VR3 500 Ω R16 324 KΩ R17 1 MΩ D1 1N4148 R18 8.2 KΩ D2 1N4148 R19 100 KΩ D3 1N4148 R20 10 KΩ D4 1N4148 R21 10 KΩ D5 1N4148 R22 100 KΩ D6 1N4148 D7 1N4148 R27 50 KΩ R28 150 KΩ Q1 C2500 R32 39 Ω Q2 C2500 R33 495 Ω Q3 C945 R34 4.995 Ω X-Tal 32768 Hz R36 324 KΩ R37 990 KΩ Z1 ZENAMIC 220
HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.2 2007.12.26 Http: www.silan.com.cn Page 15 of 17
QFP-80-14×20-0.8 UNIT: mm HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.2 2007.12.26 Http: www.silan.com.cn Page 16 of 17 23.9±0.4 0.80 20.0±0.2 0.8±0.2 3.35MAX 14.0±0.2 17.9±0.4 0.35 0.15±0.05 12.0 0.05MIN 16.3±0.4 HANDLING MOS DEVICES: Electrostatic charges can exist in many things. All of our MOS devices are internally protected against electrostatic discharge but they can be damaged if the following precautions are not taken:
- Persons at a work bench should be earthed via a wrist strap.
- Equipment cases should be earthed.
- All tools used during assembly, including soldering tools and solder baths, must be earthed.
- MOS devices should be packed for dispatch in antistatic/conductive containers.