Other Parts Discussed in Thread: ISO1540
Hi team,
My project using 2xbq76952 stacking together to manage 24 battery cells, and both bq76952 using isolated i2c (ISO1540) to communicate with host MCU. Now I have some problem to enter shutdown mode using I2C command, the hardware using optocoupler which the primary side using MCU to control the second side connect or disconnect TS2 to VSS, as I expect to using MCU to wake up each bq76952. There are some problems:
1. some time when I send the shutdown conmmand, the device won't enter shutdown mode, i read out the battery status register (0x258d) which indicate the device receive the shutdown but not perform it. Why this happen? By the way the LD pin of device is connect to VSS through an 1k resistor. I measure the TS2 pin which is 0V. Dose TS2 below VWAKEONTS2 cause the device not enter shudown mode?
2. I notice the manual mentioned TS2 is default set to 18K pull up by default and i also try to config the TS2 pin to ADC input , but why TS2 is still 0V.