Does anyone around here have experience with attiny861A current consumption, when running at very low clock frequency?
In my "invention", I use a tiny861A, clocked with a 32.768 kHz crystal, and running on 3 V (actually two AA cells in series).
When the microcontroller is active, and no other peripheral devices are switched on (there aren't that many anyway), the current consumption is around 93 - 97 ÂµA, which is about 50 percent more than I'd expected.
When looking at the datasheet, page 251, the graph shows that the current consumption at 3 V, 100 kHz, should be about 40 ÂµA. I'd be very surprised if the microcontroller would consume more current at a lower clock frequency.
The only "I/O module" that is switched on, is Timer 0, which should increase the current consumption with about 1 ÂµA (next to nothing). Also, BOD is on, which can further increase the current consumption with 18 ÂµA (page 259). Pull-up resistors are switched off.
All in all, I would expect a current consumption of 60 ÂµA or less. Certainly not above 90 ÂµA. What could I have forgotten?
When I put the microcontroller in deep sleep mode (BOD off), the current consumption is well below 1 ÂµA, so that is fine.