Using the BQ7692006PWR configured for an over current trip point of 8.25A in 8mS I can not get the fault to occur. The BQ7692006PWR is returning a current measurement of -9.79A over I2C. The circuit is driving a PWM'd resistive load.
The short circuit faults occur when I short the load. Over voltage, and under voltage faults all occur when expected.
I'm using PROTECT1 0x82 and PROTECT2 = 0x03 with a 4mOhm sense resistor. This results in protection settings of
| SC: 22.25A for 70uS OC: 8.25A for 8mS |
Reading the register values from SYS_CRTL1 to UV_TRIP I get the following values from the BQ7692006PWR.
This is a custom board, not an EVM, and I have the following scope screen capture. It's noisy due to long ground wires on the scope probes, so not very accurate in the vertical scale. But it does show the PWM'd current at the sense resistor R105. A similar signal is present across C66 but I don''t have enough hands to hold the probes in place and capture the image.
I'm curious if the PWM'd load is preventing the over current from triggering since the current that exceeds the threshold is less than 8mS. It seems odd that the BQ IC is returning a value higher current measurement than the over current trip threshold, but not indicating an over current fault condition.
