Other Parts Discussed in Thread: BQ24250, BQ27441-G1
Hi,
I would like to know the current consumption of the board in normal mode, sleep mode, hibernate mode and shutdown mode of BQ27441.
The BQ24250 is in HZ mode.
When I am in normal mode of the BQ27441, I measure 15mA for the board.
When I am in shutdown mode of the BQ27441, I measure less than 0.5 mA for the board.
So I concluded that it was the BQ27441 that consumed a big part of the current.
But on the BQ27441-G1 datasheet the current are very low (section 8.5).
Also I would like to go in sleep mode and hibernate mode.
I have try two methods to go in sleep mode but no one of them work so I cannot access to the hibernate mode.
method 1:
I tried to change the value of SleepCurrent(subclass ID 82 offset 31) but the value I read is 172(0x00AC) and normaly need to be 10(0x000A) on default. I tried to change this value but it's not working.
I can read correctly and modify the values before(Taper Rate and Taper Voltage) and after(Voltage at Charge Termination).
To read and modify I use the method in section 3.1 of the bq27441-G1 technical reference.
method 2:
I tried to force the SDA to 0(GND) and in other time SCL to 0(not in the same time). But the consumption was around 15 mA for the board and I can verify if I was really in the sleep mode.
See section 9.5.4.9 in the datasheet.
I have two boards and the result are similar.
Best Regards,
Pierre Krebs