Other Parts Discussed in Thread: , BQ25756
Hello everyone,
for my custmer I must to develop a charger and to do this I choose a BQ25750EVM board for analisys.
After the first test, I have some questions about this device:
1): is it possible to reprogram the default value of registers, for example the ICHG_REG to the lower value (400mA)?
My problem is that the BQ25750 is alway connected to the battery and the power supply (VAC).
The battery voltage is 54Vmax and the VAC voltage is 16.5V. I set the BQ25750 via hardware, for output feedback, with a 6K8Ohm. In this way I have an output about 58V.
The default registers settings (@POR) are:
so, my doubt is if something happens (like noise, mcu crash, wdg, ecc..) which causes the BQ25750 to restart, there is a risk to damage the entire system.
Of course I can handle the threshold with hardware settings, but if I want to change for example the charge current (via I2C) over the hw threshold, this is not possible.
2): is there any reason why the minimum charge current value in ICHG_REG is set to 400mA (0x08). For my application where the charge current is setting by BMS, it is necessary that current is set to start from 0mA.
3): is it possible to have a Bit Step lower than 50mA for ICHG_REG, in order to have better precision during the charge stage?
4): when I power on the EVM board LED D6 (power good) is always ON and this is OK for me, but D4(STAT1) and D5(STAT2) LEDS are blinking alternatively. NO battery is connected to the output (it is floating). What does this mean?
In the datasheet does not explain the blink case (or for me it is not so clear) of STAT1 and STAT2.
Thank you for your help.
