TC3405 MICROCHIP | Alldatasheet
Document overview
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Technical content
Features
- 16-bit Resolution at Eight Conversions Per Second, Adjustable Down to 10-bit Resolution at
512 Conversions Per Second
1.8V – 5.5V Operation, Low Power Operating 250µA; Sleep: 35µA microPort™ Serial Bus Requires only two Interface Lines Uses Internal or External Reference Automatically Enters Sleep Mode when not in use One Differential and Three Single-ended Inputs with Built-In Multiplexer DD Monitor and Reset Generator Operational in Shutdown Mode
Applications
Consumer Electronics, Thermostats, CO Monitors, Humidity Meters, Security Sensors Embedded Systems, Data Loggers, Portable Equipment Medical Instruments Device Selection Table Package Type General Description The TC3405 is a low cost, low power analog-to-digital converter based on Microchip’s Sigma-Delta technol- ogy. It will perform 16-bit conversions (15-bit plus sign) at up to eight per second. The TC3405 is optimized for use as a microcontroller peripheral in low cost, battery operated systems. A voltage reference is included, or an external reference can be used. A V DD monitor with a reset generator provides Power-on Reset and Brown- out protection while an extra threshold detector is suit- able for use as an early warning power fail detector, or as a Wake-up Timer. The TC3405’s 2-wire microPort™ digital interface is used for starting conversions and for reading out the data. Driving the SCLK line low starts a conversion. After the conversion starts, each additional falling edge (up to six) detected on SCLK for t 4 seconds reduces the A/D resolution by one bit and cuts conversion time in half. After a conversion is completed, clocking the SCLK line puts the MSB through LSB of the resulting data word onto the SDAT line, much like a shift register. The part automatically sleeps when not performing a data conversion. T h eT C 3 4 0 5i sa v a i l a b l ei na1 6 - P i nP D I Pa n da1 6 - P i n QSOP package. Part Number Package Temperature Range TC3405VPE 16-Pin PDIP (Narrow) 0 °Ct o+ 8 5°C TC3405VQR 16-Pin QSOP Narrow) 0 °Ct o+ 8 5°C 16-Pin PDIP 16-Pin QSOP 1 16 21 5 31 4 41 3 51 2 61 1 71 0 IN4 IN1- IN2 REFIN GND VDD SDAT REFOU T TC3405 SCLK RESET VTH IN3 ENABLE IN1+ 16-Bit, Low Cost, Low Power Sigma-Delta A/D Converter
DS21414B-page 2 2002 Microchip Technology Inc. Typical Application Functional Block Diagram TC3405 µ Controller ENABLE SDAT SCLK AO AI RESET REFOUT REFIN VTH IN3+ IN4+ IN2+ IN1- IN1+ I/01 I/02 I/03 I/04 RST VBATT VBATT 0.1µF 130kΩ 110kΩ 390 ±10% Input 1 Input 2 Input 3 Input 4 + VDD VBATT 100k VCC TC3405 IN2 IN3 SDAT REFIN REFOUT SCLKClock Generator and Control Circuitry Data Shift Reg. Σ – ∆ Modulator1 of 4 AMux+ CONV done CONVCLK DQ SET CLR 1.193V VDD CLKOUT Start Conv. DQ SET CLR IN1+ + IN4 + Reset Delay Timer+ RESETVTH 1.23V IN1- GND ENABLE
2002 Microchip Technology Inc. DS21414B-page 3 TC3405
1.0 ELECTRICAL
Absolute Maximum Ratings* Voltage on Pin: Input Voltage (All Other Pins): *Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. TC3405 DC ELECTRICAL SPECIFICATIONS Electrical Characteristics: TA = 25°C and VDD = 2.7V, unless otherwise specified. Boldface type specifications apply for temperatures of 0°C to 85°C. VREF = 1.25V, Internal Clock Frequency = 520kHz. Symbol Parameter Min Typ Max Unit Test Conditions Power Supply VDD Supply Voltage 1.8 — 5.5 V IDD Supply Current, During Data Conversion — 250 — µA IDDSLEEP Supply Current, Sleep Mode — 35 80 µAT A =+ 2 5 ° C — 38 50 µA Accuracy (Differential Inputs) RES Resolution — 16 — Bits INL Integral Non-Linearity — .0038 — %FSR V DD =2 . 7 V VOS Offset Error — — ±0.9 %FSR IN+, IN- = 0V VNOISE Referred to input — 60 — µVrms CMR Common Mode Rejection — 75 — dB At DC FSE Full Scale Error — 0.4% — %FS PSRR Power Supply Rejection Ratio — 75 — dB V DD =2 . 5 Vt o3 . 5 V INn+, INn-, INn VIN± Differential Input Voltage — — V DD V Note 1 Absolute Voltage Range on INn+, INn-, INn GND — V DD V Input Bias Current — 1 100 nA CIN Input Sampling Capacitance — 2 — pF RIN Differential Input Resistance — 2.0 — M Ω Note 2 REFIN, REFOUT VREF REFIN Voltage Range 0 — 1.25 V IREF REFIN Input Current — 1 — µA VREFOUT REFOUT Voltage 1.175 1.193 — V REFSINK REFOUT Current Sink Capability — 10 — µA REFSRC REFOUT Current Source Capability 300 — — µA Note 1: Differential input voltage defined as (VIN+–V IN-). 2: Resistance from INn+ to INn- or INn to GND. 3: @V DD =1 . 8 V ,ISOURCE ≤ 200µA.
DS21414B-page 4 2002 Microchip Technology Inc. TC3405 AC ELECTRICAL SPECIFICATIONS SCLK, A0 A1, ENABLE VIL Input Low Voltage — — 0.3 x VDD V VIH Input High Voltage 0 . 7xVDD ——V ILEAK Leakage Current — 1 — µA SDAT, RESET VOL Output Low Voltage — — 0.4 V I OL =1 . 5 m A VOH Output High Voltage (SDAT) 0.9 x V DD ——V I SOURCE =4 0 0µA (Note 3) VDDMIN Minimum VDD for PFO, RESET Valid — 1.1 1.3 µA VTH,P F I VCCPFI PFI Input Voltage Range 0 — V DD V VTH, PFI Input Current -0.1 .01 0.1 µA VTHR Threshold (VTH,P F I ) — 1 . 2 3 — V Threshold Hysteresis — 30 — mV Threshold Tempco — 30 — ppm/°C Electrical Characteristics: T A = 25°C and VDD = 2.7V, unless otherwise specified. Boldface type specifications apply for temperatures of 0°C to 85°C. VREF = 1.25V, Internal Clock Frequency = 520kHz. Symbol Parameter Min Typ Max Unit Test Conditions t1 Resolution Reduction Clock Width 1 — — µsec Width of SCLK (Negative) t2 Resolution Reduction Clock Width 1 — — µsec Width of SCLK (Positive) t3 Conversion Time (15-bit Plus Sign) — 125 — msec 16-bit Conversion, T A =2 5 ° C(Note 1) Conversion Time (14-bit Plus Sign) — t 3/2.0 — msec 15-bit Conversion Conversion Time (13-bit Plus Sign) — t 3/4.0 — msec 14-bit Conversion Conversion Time (12-bit Plus Sign) — t 3/7.8 — msec 13-bit Conversion Conversion Time (11-bit Plus Sign) — t 3/15.1 — msec 12-bit Conversion Conversion Time (10-bit Plus Sign) — t 3/28.6 — msec 11-bit Conversion Conversion Time (9-bit Plus Sign) — t 3/51.4 — msec 10-bit Conversion t4 Resolution Reduction Window — t 3/85.7 — msec Width of SCLK t5 SCLK to Data Valid 1000 — — nsec SCLK Falling Edge to SDAT Valid t6 Address Setup 0 — — nsec Address Valid to SCLK t7 Address Hold 1000 — — nsec SCLK to Address Valid Hold t8 Acknowledge Delay — — 1000 nsec SCLK to SDAT Delay t9 RESET Active Time-out Period — t 3*2 — msec Delay from POR or Brown-out Recovery to RESET =V OH t11 RESET Delay 5 — 64 µsec Delay V TH Falling at 10V/msec to RESET Low Note 1: Nominal temperature drift is -2830ppm/C° for temperature less than 25°C and -1340ppm/°C for temperatures greater than 25°C. TC3405 DC ELECTRICAL SPECIFICATIONS (CONTINUED) Electrical Characteristics: TA = 25°C and VDD = 2.7V, unless otherwise specified. Boldface type specifications apply for temperatures of 0°C to 85°C. VREF = 1.25V, Internal Clock Frequency = 520kHz. Symbol Parameter Min Typ Max Unit Test Conditions Note 1: Differential input voltage defined as (VIN+–V IN-). 2: Resistance from INn+ to INn- or INn to GND. 3: @V DD =1 . 8 V ,ISOURCE ≤ 200µA.
2002 Microchip Technology Inc. DS21414B-page 5 TC3405
2.0 PIN DESCRIPTIONS
T h ed e s c r i p t i o n so ft h ep i n sa r el i s t e di nT a b l e2 - 1 . TABLE 2-1: PIN FUNCTION TABLE Pin No. (16-Pin PDIP) (16-Pin QSOP) Symbol Description 1 IN1+ Analog Input. This is the positive terminal of a true differential input consisting of IN1+ and IN1-. VIN1 = (IN1+ – IN-). See Section 1.0, Electrical Characteristics. 2 IN1- Analog Input. This is the negative terminal of a true differential input consisting of IN1+ and IN1-. VIN1 = (IN+ – IN-) IN1- can swing to, but not below, ground. See Section 1.0, Electrical Characteristics. 3 IN2 Analog Input. This is the positive terminal of a true differential input with the negative input tied internally to GND. See Section 1.0, Electrical Characteristics. 4 IN3 Analog Input. This is the positive terminal of a true differential input with the negative input tied internally to GND. See Section 1.0, Electrical Characteristics. 5 IN4 Analog Input. This is the positive terminal of a true differential input with the negative input tied internally to GND. See Section 1.0, Electrical Characteristics. 6V TH Analog Input. This is the positive input to the internal comparator used to monitor the voltage supply. The negative input is tied to an internal reference. When V TH falls below the internal reference, the reset generator drives RESET low. See Section 1.0, Electrical Characteristics. 7R E F IN Analog Input. The converter’s reference voltage is the differential between this pin and ground times t w o .I tm a yb et i e dd i r e c t l yt oR E FOUT or scaled using a resistor divider. Any user supplied reference voltage less than 1.25 may be used in place of REF OUT. 8 GND Ground Terminal. 9R E F OUT Analog Output. The internal reference connects to this pin. It may be scaled externally, and tied to the REFIN input to provide the converter’s reference voltage. Care must be taken in connecting external circuitry to this pin. This pin is in a high impedance state during Sleep mode. 10 SDAT Digital Output (push-pull). This is the microPort™ serial data output. SDAT is driven low while the TC3405 is converting data, effectively providing a “busy” signal. After the conversion is complete, every high to low transition on the SCLK pin puts a bit from the resulting data word on the SDAT pin (from MSB to LSB). 11 ENABLE Digital Input. When this input control is pulled low, the part is internally restarted. That is, any data conversion or data read sequence is cleared and the part goes into Sleep mode. When ENABLE returns high, the part resumes normal operation.
12 RESET
Digital Output (open drain). This is the output of the VDD monitor reset generator. RESET is driven low when a Power-on Reset or Brown-out condition is detected. See Section 1.0, AC Electrical Characteristics. 13 A1 Digital Input. Controls analog multiplexer in conjunction with A0 to select one of the four input channels. This address is latched at the falling edge of the SCLK, which starts an A/D conversion. A1, A0 = 00 = Input 1; 01 = Input 2; 10 = Input 3; 11 = Input 4. 14 A0 Digital Input. Controls analog multiplexer in conjunction with A1 to select one of the four input channels. This address is latched at the falling edge of the SCLK, which starts an A/D conversion. A1, A 0=0 0=I n p u t1 ;0 1=I n p u t2 ;1 0=I n p u t3 ;1 1=I n p u t4 . 15 SCLK Digital Input. This is the microPort™ serial clock input. The TC3405 comes out of Sleep mode and a conversion cycle begins when this pin is driven low. After the conversion starts, each additional falling edge (up to six) detected on SCLK for t 4 seconds, reduces the A/D resolution by one bit. When the conversion is complete, the data word can be shifted out on the SDAT pin by clocking the SCLK pin. 16 V DD Power Supply Input.
DS21414B-page 6 2002 Microchip Technology Inc.
3.0 DETAILED DESCRIPTION
The TC3405 has a 16-bit sigma-delta A/D converter. It has one differential input, three single-ended inputs, an analog multiplexer and a V DD monitor with reset gener- ator. See the Typical Application circuit and the Functional Block diagram. The key components of the TC3405 are described below. Also refer to Figure 3-5, A/D Operational Flowchart and the Timing Diagrams, Figure 3-1, Figure 3-2 and Figure 3-3.
3.1 A/D Converter Operation
When the TC3405 is not converting, it is in Sleep mode with both the SCLK and SDAT lines high. An A/D conversion is initiated by a high to low transition on the SCLK line at which time the internal clock of the TC3405 is started and the address value (A0 and A1) is internally latched. The address value steers the ana- log multiplexer to select the input channel to be converted. Each additional high to low transition of SCLK (following the initial SCLK falling edge) during t h et i m ei n t e r v a lt 4, will decrement the conversion resolution by one bit and reduce the conversion time by one half. The time interval t 4 is referred to as the resolution reduction window. The minimum conversion resolution is 10-bits so any more than 6 SCLK transitions during t 4 will be ignored. After each high to low transition of SCLK, in the t 4 interval, the SDAT output is driven high by the TC3405 to acknowledge that the resolution has been decre- mented. When the SCLK returns high or the t 4 interval ends, the SDAT line returns low (see Figure 3-2). When the conversion is complete SDAT is driven high. The TC3405 now enters Sleep mode and the conversion value can be read as a serial data word on the SDAT line.
3.2 Reading the Data Word
After the conversion is complete and SDAT goes high, the conversion value can be clocked serially onto the SDAT line by high to low transitions of the SCLK. The data word is in two’s compliment format with the sign bit clocked onto the SDAT line, first followed by the MSB and ending in the LSB. For a 16-bit conversion the data word would consist of a sign bit followed by 15 magni- tude bits, T able 3-1 shows the data word versus input voltage for a 16-bit conversion. Note that the full scale input voltage range is ±(2 REF IN – 1LSB). When REFOUT is fed back directly to REF IN,a nL S Bi s7 3µV for a 16-bit conversion, as REF OUT is typically 1.193V. Figure 3-4 shows typical SCLK and SDAT waveforms for 16, 12 and 10-bit conversions. Note that any com- plete convert and read cycle requires 17 negative edge clock pulses. The first is the convert command. Then, up to six of these can occur in the resolution reduction window, t 4, to decrement resolution. The remaining pulses clock out the conversion data word. TABLE 3-1: DATA CONVERSION WORD VS. VOLTAGE INPUT (REF IN = 1.193V) The SCLK input has a filter which rejects any positive or negative pulse of width less than 50nsec to reduce noise. The rejection width of this pulse can vary between 50nsec and 750nsec depending on process- ing parameters and supply voltage. Figure 3-1 and Table 3-2 show information for deter- mining the mode of operation for the TC3401 part by recording the value of SDAT for SCLK in a high, then low, then high state. For example, if SCLK goes through a 1-0-1 transition and the corresponding values of SDAT are 1-1-0, then the SCLK falling edge started a new data conversion. A 0-1-0 for SDAT would have indicated a resolution reduction had occurred. This is useful if the microcontroller has a Watchdog Reset or otherwise loses track of where the TC3405 is in the conversion and data readout sequence. The microcontroller can simply transition SCLK until it “finds” a Start Conversion condition. FIGURE 3-1: SCLK, SDAT LOGIC STATE DIAGRAM TABLE 3-2: SCLK, SDAT LOGIC STATE *Note: The code X00 has a dual meaning: Data Transfer or Busy converting. To avoid confusion, the user should send only the required number of pulses for the desired resolution, then wait for SDAT to rise to 1, indicating conversion is complete before clocking SCLK again to read out data bits. Data Word INn + –I N n -( V o l t s ) 0111 1111 1111 1111 2.38596 (Positive Full Scale) 0000 0000 0000 0001 72.8 E -6 0000 0000 0000 0000 0 1111 1111 1111 1111 -72.8 E -6 1000 0000 0000 0001 -2.38596 (Negative Full Scale) 1000 0000 0000 0000 Reserved Code AB C S t a t u s 1 1 0 Start Conversion 0 1 0 Resolution Reduction x 1 1 Data Transfer x 0 0 Data Transfer or Busy* SCLK SDAT A BC
2002 Microchip Technology Inc. DS21414B-page 7 TC3405 FIGURE 3-2: CONVERSION AND DATA OUTPUT TIMING FIGURE 3-3: RESET AND POWER FAIL TIMING SCLK SDAT DN-1 DN-1 D0 (LSB) DN (MSB) Data Conversion Complete Sleep Mode A0, A1 Start Conversion and Resolution Control Timing Data Output Timing t6 t7 RESET VTH 1.23 VDD Reset Generator Timing t9 t11 1.1
1.20 Hysteresis
1.80
DS21414B-page 8 2002 Microchip Technology Inc. FIGURE 3-4: SCLK AND SDAT WAVEFORMS FOR 16, 12 AND 10-BIT CONVERSIONS SCLK SDAT t3a 16-bit Data Conversion, Data Word A5A5h SCLK SDAT 16-bit Data Conversion, Long Start Pulse, Data Word 5A5Ah > t3a Data Conversion Complete SCLK SDAT 12-bit Conversion, Data Word = AB3h SCLK SDAT t3g 10-bit Conversion with "Extra" Data Reduction Clocks, Data Word = 3A4h Data Conversion Complete Data Conversion Complete Data Conversion Complete t3e < t4 < t4
2002 Microchip Technology Inc. DS21414B-page 9 TC3405 FIGURE 3-5: A/D OPERATIONAL FLOWCHART Yes No Yes No Yes Yes Yes No No No Yes Yes No Yes No POR Sleep SDAT = High SCLK Hgh to Low? Power Up Analog, Start CONVCLK (= 0), Start Conversion, Resolution = 2m (m = 16), Latch Input Channel Address (if applicable). SCLK Low to High transition? SDAT = Low CONVCLK < 29? SCLK High to Low? A/D Resolution > 210? Reduce A/D Resolution by 1-bit (m = m – 1); SDAT = High SDAT = Low CONVCLK = 2m? (Conversion Done?) Power Down Analog, Conversion Complete, SDAT = High SCLK High to Low? SDAT = Dm; m = m – 1 m ≥ 0? SDAT = High Internal Reset Sleep No
DS21414B-page 10 2002 Microchip Technology Inc.
3.3 V DD Monitor
The TC3405 RESET output is in high impedance provided the voltage at V TH is greater than the internal voltage reference. This reference is approximately the same value as the voltage appearing at REF OUT.W h e n VTH is less than the internal reference, RESETis pulled low. When V TH rises above the internal reference voltage again, RESET is held low for the reset active time-out period, t9, before being released. The RESET output is valid for VDD =1 . 3 Vt o5 . 5 V . When used to generate a Power-on or Brown-out Reset, an external resistor network is required to divide the appropriate V DD threshold down to 1.23V at the VTH input, (See the Typical Application circuit). For example, to generate a POR for a VDD at 3V -10%, the values of R1 and R2 should be 137k Ω and 115k Ω respectively. Since RESET is an open drain, it can be wired-OR’ed with another open drain or external switch if desired.
2002 Microchip Technology Inc. DS21414B-page 11 TC3405
4.0 PACKAGING INFORMATION
4.1 Package Marking Information
Package marking data not available at this time.
4.2 Taping Forms
Component Taping Orientation for 16-Pin QSOP (Narrow) Devices PIN 1 User Direction of Feed Standard Reel Component Orientation for TR Suffix Device W P Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 16-Pin QSOP (N) 12 mm 8 mm 2500 13 in Carrier Tape, Reel Size, Number of Components Per Reel and Reel Size
DS21414B-page 12 2002 Microchip Technology Inc.
4.3 Package Dimensions
.110 (2.79) .090 (2.29) .022 (0.56) .015 (0.38) .150 (3.81) .115 (2.92) .770 (19.56) .740 (18.80) .045 (1.14) .030 (0.76) .070 (1.78) .045 (1.14) .310 (7.87) .290 (7.37) .040 (1.02) .020 (0.51) .270 (6.86) .240 (6.10) .200 (5.08) .140 (3.56) .014 (0.36) .008 (0.20) .400 (10.16) .310 (7.87) 16-Pin PDIP (Narrow) PIN 1 10° MAX. Dimensions: inches (mm) MAX. PIN 1 .157 (3.99) .150 (3.81) .196 (4.98) .189 (4.80) .012 (0.31) .008 (0.21) .010 (0.25) .004 (0.10) .069 (1.75) .007 (0.19) .050 (1.27) .016 (0.41) .244 (6.20) .228 (5.80) .025 (0.635) TYP. 16-Pin QSOP (Narrow) Dimensions: inches (mm)
© 2002 Microchip Technology Inc. DS21414B-page 13 TC3405 SALES AND SUPPORT Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom- mended workarounds. T o determine if an errata sheet exists for a particular device, please contact one of the following: 1. Your local Microchip sales office 2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 3. The Microchip Worldwide Site (www.microchip.com) Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using. New Customer Notification System Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
DS21414B-page 14 © 2002 Microchip Technology Inc. NOTES:
2002 Microchip Technology Inc. DS21414B-page 15 TC3405 Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip T echnology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip’s products as critical com- ponents in life support systems is not authorized except with express written approval by Microchip. No licenses are con- veyed, implicitly or otherwise, under any intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, FilterLab, K EELOQ,m i c r o I D ,M P L A B ,P I C ,P I C m i c r o ,P I C M A S T E R , PICSTART, PRO MATE, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Tech- nology Incorporated in the U.S.A. and other countries. dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, microPort, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. Serialized Quick Turn Programming (SQTP) is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received QS-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona in July 1999 and Mountain View, California in March 2002. The Company’s quality system processes and procedures are QS-9000 compliant for its PICmicro ® 8-bit MCUs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, non-volatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001 certified.
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