Customers trying to use BQ32000 in their 5V system products(water heater)
As BQ32000 is powered by 3.3V a voltage regulator is needed in this case.
In order to save LDO cost, we are planning to use a resistor divider to generate 3.3V for BQ32000.
- Any potential risk for this structure?
- The supply current BQ32000 needed? (In datasheet chapter 6.5 I found Icc is about 0.1mA. I want to double confirm 100uA is enough for BQ32000)
- What's the minimum voltage BQ32000 could work when it powered by a backup supply? (Is 1.4V or 2V?)
- BQ32000 communicated with 5V MCU with I2C interface. If I pull-up I2C interface to 3.3V, could we connect to MCU directly without a level shifter? Will MCU signal with 5V voltage level damage BQ32000? (I am not sure what voltage level BQ32000 will see as we pull-up the bus to 3.3V)
- I noticed that BQ32000 could charge the backup supply internally, I wondering to know how much current it could handle during the charge?