Part Number:BQ35100
Hello,
Regarding the board TIDA-01236, there's the arrangement as described in the related document TIDUCU1 as using a TPS61070 as a boost converter used for two purposes, feeding 4V for the buzzer and powering and enabling at the same time the BQ35100, this has several issues as described below:
1. BAT has voltage from the battery even when REGIN, the main input voltage for the device, does not.
2. GE is supposed to be low for the chip to be powered off, the only "pull-down" I see is that from the feedback pin for the boost regulator, more than 2M. Obviously the chip wouldn't have direct power, but I wonder if some internal circuitry would run if it "draws" power from the I2C pull-up resistors.
3. There are obviously pull-up resistors on the I2C lines, which would put voltage on the BQ31500 inputs even when powered off, the input protection on most ICs are diodes to the power rails, so it would "parasitically" power it and put extra leakage drain on the battery and well, put voltage on the un-powered chip.
Is the implementation on that reference board validated and characterized to behave as intended in ultra-low power applications?
I don't know, am I missing something here?
Thanks.