TPS3435 Nano IQ Precision Timeout Watchdog Timer
Texas Instruments' nano-quiescent-current (nano IQ) timer has five pinout configurations to meet various application requirements
Texas Instruments' TPS3435 nano IQ timer has an ultra-low power consumption (250 nA typical) offering a programmable high-accuracy timeout watchdog timer with a host of features for a wide variety of applications. The timeout watchdog timer can be factory-programmed or user-programmed using an external capacitor. The timer value can be changed on-the-fly using a combination of logic pins. The watchdog feature can be enabled or disabled using a dedicated pin or a combination of timer extension pins.
The device also offers start-up delay options to disable watchdog monitoring for a fixed amount of time immediately after the host powers up. The WDO delay can be set by factory-programmed default delay settings or programmed by an external capacitor. The timer has a latched-output operation where the output is latched until the watchdog fault is cleared. The TPS3435 provides a performance upgrade alternative to the TPS3431 devices and is available in small 6-pin WSON and 8-pin SOT23 packages.
- Factory-programmed or user-programmable watchdog timeout/user-programmable reset delay:
- Accurate timer: ±10% (max.)
- Factory-programmed: 1 msec to 100 sec. or 2 msec to 10 sec. (user-programmable reset delay)
- Input voltage range VDD: 1.04 V to 6.0 V
- MR-functionality support
- Ultra-low supply current IDD: 250 nA (typ.)
- Open-drain, push-pull; active-low outputs
- Various programmability options:
- Watchdog enable-disable
- Watchdog startup delay: no delay to 10 sec
- On-the-fly timer extension: 1X to 256X
- Latched output option
- Robot servo drives
- Mixed modules (AI, AO, DI, and DO)
- HVAC controllers
- Electricity meters
- Infusion pumps
- Surgical equipment