SPMU383 April 2026 BQ27Z846
Before writing this command, the Override Key unlock sequence must be sent to register 0x00. The Override Key values can be read using ManufacturerAccess() 0x0035 Security Keys. The default Override Key is 0x2D18 (first word) and 0x2E9B (second word). Send the first word to register 0x00 (LSB first), then send the second word to register 0x01 to unlock. The unlock window is 4 seconds; the write must complete within this time.
After completing a write to this command, allow at least 100 ms before initiating the next write sequence. This ensures the device has time to complete internal flash operations.
This command enables writing the thirty advanced charge algorithm charging current values in SEALED mode. The data written will take immediate effect. However, to prevent over-usage of this command from causing severe data flash wear, Sealed Write.Hold Off sets the delay time before the new charging current value is written to data flash. Sealed Write.Lockout sets the period of time after the value is written to data flash when 0x00B2 command is ignored. The maximum limit on values allowed to write is CHGI Override Max and minimum limit on values allowed to write is CHGI Override Min. The format is as following: aaAAbbBBccCCddDDeeEEffFFggGGhhHHiiIIjjJJkkKKllLLmmMMnnNNooOO where:
| Value | Description | Unit |
|---|---|---|
| AAaa | Low Temperature Charging Current Low | mA |
| BBbb | Low Temperature Charging Current Med | mA |
| CCcc | Low Temperature Charging Current High | mA |
| DDdd | Standard Temperature Low Charging Current Low | mA |
| EEee | Standard Temperature Low Charging Current Med | mA |
| FFff | Standard Temperature Low Charging Current High | mA |
| GGgg | Standard Temperature High Charging Current Low | mA |
| HHhh | Standard Temperature High Charging Current Med | mA |
| IIii | Standard Temperature High Charging Current High | mA |
| JJii | High Temperature Charging Voltage Charging Current Low | mA |
| KKkk | High Temperature Charging Charging Current Med | mA |
| LLll | High Temperature Charging Charging Current High | mA |
| MMmm | Recommended Temperature Charging Current Low | mA |
| NNnn | Recommended Temperature Charging Current Med | mA |
| OOoo | Recommended Temperature Charging Current High | mA |