LETIMER – Low Energy Timer

Quick Facts

What?

The LETIMER is available in Energy Mode 0 to Energy Mode 2 and is a down-counter that can keep track of time and output configurable waveforms (pulses). Running on a 32 kHz clock the LETIMER is available even in EM2 with sub µA current consumption.

Why?

The LETIMER can provide repeatable waveforms to external components while remaining in EM2. It is well suited for e.g. metering systems.

How?

The unique LETIMER is a 16-bit timer available in energy mode EM2 in addition to EM1 and EM0. Because of this, it can be used for timing and output generation when most of the device is powered down, allowing simple tasks to be performed while the power consumption of the system is kept at an absolute minimum. The LETIMER can be used to output a variety of waveforms with minimal software intervention. It is also connected to the Real Time Counter (RTC), and can be configured to start counting on compare matches from the RTC. With buffered repeat and top value registers, the LETIMER can provide glitch-free waveforms at frequencies up to 16 kHz. It is tightly coupled to the RTC, which allows advanced time-keeping and wake-up functions in EM2.