SLUSCU0I March 2018 – September 2020 BQ77915
The BQ77915 device supports 3-series, 4-series, or 5-series packs. To avoid accidentally detecting a UV fault on unused (shorted) cell inputs, the device must be configured for the specific cell count of the pack. This is set with the configuration pin, CCFG, which is mapped as shown in Table 9-7. The device periodically checks the CCFG status and takes tCCFG_DEG time to detect the pin status.
|< VCCFGL for tCCFG_DEG||3 cells||VSS|
|Within VCCFGM for tCCFG_DEG||4 cells||AVDD|
|> VCCFGH for tCCFG_DEG||5 cells||Floating|
The CCFG pin should be tied to the recommended net from Table 9-7. The device compares the CCFG input voltage to the AVDD voltage and should never be set above the AVDD voltage. When the device configuration is for 5 series, leave the CCFG pin floating. The internal pin bias is approximately 33% of the AVDD voltage for 5-series configuration.