Dallas, Tex. − Texas Instruments (TI) has unveiled two programmable system timers that claim to reduce system standby power consumption by up to 80 percent over existing solutions. The TPL5000 with a watchdog timer and TPL5100 with a MOS driver draw only 30 nA of current, a reduction of 90 percent compared to competitive solutions, said TI. They also replace a microcontroller's (MCU's) internal timer, allowing the MCU to remain in low-power sleep mode.
The nano timers may be used in a variety of battery-powered and energy harvesting systems, including smoke alarms, CO alarms, intelligent price tags, occupancy sensors, security cameras, door locks, wireless sensor nodes and data loggers. In these applications, the main system is in sleep mode or power-down mode most of the time, which makes the power consumption of the MCU internal timer significant, said TI. By drawing much lower current than an MCU timer, the TPL5000 and TPL5100 reduce power consumption, and extend the operating life of these systems, added the company.
In addition, by offering a selectable timing delay feature, which can be set from one to 64 seconds, the nano timers can further extend battery life in many applications including smoke detectors. It can be programmed for 16- to 1,024-second intervals in energy harvesters, wireless sensor nodes and data loggers, where measurement data changes slowly, said TI.
The TPL5000 supports the EN50271 European safety standard without adding to a system's power consumption budget, according to TI.
The TPL5000 can be used with any microcontroller, including TI's Tiva C Series TM4C123x ARM Cortex-M4, Piccolo C28x and fully programmable MSP430G2553 Value Line. It can also be used with the LMP91000 configurable AFE potentiostat for chemical sensing or the LMP91050 configurable AFE for NDIR sensing, as well as the bq25504 nano-power management IC, and TPS62175 and TPS61220 DC/DC converters.
Pricing: Suggested retail price for the TPL5000 and TPL5100 is $0.60 in quantities of 1,000. The TPL5000EVM or TPL5100EVM evaluation modules (EVMs) are available for a suggested retail price of $20. The EVMs allow designers to configure the TPL5000 and TPL5100's delay timers and measure their ultra-low current consumption, said TI. They connect directly to the MSP430, Tiva C Series and C2000 Piccolo LaunchPads to test their watchdog timer and power cycling features. IBIS models are also available for the TPL5000 and TPL5100 to verify signal integrity.