Nano-power timers with watchdog and power-switch functions

August 26, 2013 // By Graham Prophet
Texas Instruments has introduced the TPL5000 and 5100, long-term timer ICs optimised for low power applications.

The TPL5000 can replace a micro controller’s internal timer, allowing the MCU to stay in low power sleep mode instead of running a timer, providing a total power consumption reduction of 60 to 80%. The TPL5000 is designed for use in interrupt-driven applications and provides selectable timing from 1 second to 64 seconds. Some Standards (i.e. EN50271) require implementation of a watchdog function for safety. The TPL5000 realises this watchdog function without consuming additional power. The TPL5000 can also monitor a battery management IC via a power-good digital input and reset the MCU if necessary. The device is packaged in a 10-pin VSSOP package.

It operates from 1.8V to 5.0V with current consumption of 30nA (typ, at 2.5V), and you can set timer intervals from 1sec to 64sec.

The similar TPL5100 replaces the watchdog function with a power-gating function. It has selectable timing intervals from 16 sec to 1024 sec. And features an MOS driver output.

TI; www.ti.com/product/tpl5000 / www.ti.com/product/tpl5100