TC3405| Datasheet

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TC3405
16-Bit, Low Cost, Low Power Sigma-Delta A/D Converter
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 250uA; Sleep: 35uA microPortTM 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 VDD Monitor and Reset Generator Operational in Shutdown Mode

Package Type
16-Pin PDIP 16-Pin QSOP
IN1+ IN1IN2 IN3 IN4 VTH REFIN GND 1 2 3 4 5 6 7 8 16 15 14 VDD SCLK A0 A1 RESET ENABLE SDAT REFOUT

TC3405

13 12 11 10 9

Applications
Consumer Electronics, Thermostats, CO Monitors, Humidity Meters, Security Sensors Embedded Systems, Data Loggers, Portable Equipment Medical Instruments

General Description
The TC3405 is a low cost, low power analog-to-digital converter based on Microchip's Sigma-Delta technology. 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 VDD monitor with a reset generator provides Power-on Reset and Brownout protection while an extra threshold detector is suitable for use as an early warning power fail detector, or as a Wake-up Timer. The TC3405's 2-wire microPortTM 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 t4 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. The TC3405 is available in a 16-Pin PDIP and a 16-Pin QSOP package.

Device Selection Table
Part Number TC3405VPE Package 16-Pin PDIP (Narrow) Temperature Range 0 C to +85 C 0 C to +85 C

TC3405VQR 16-Pin QSOP Narrow)

2002 Microchip Technology Inc.

DS21414B-page 1