TC3405

Supply Voltage .................................................................... 6.0V
Voltage on Pin:
        RESET................................................. (GND 0.3V) to 5.5V
Input Voltage (All Other Pins):........ (GND 0.3V) to (V_DD + 0.3V)
Operating Temperature Range .................................... 0 to 85
Storage Temperature ........................................... -65 to +150

*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.

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 V_DD 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 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 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.