Datasheet

4
bq2040
Parameter Name Address Description Length Units
EEPROM length 0x00
Number of EEPROM data locations
must = 0x64
8 bits NA
EEPROM check1 0x01 EEPROM data integrity check byte, must = 0x5b 8 bits NA
Remaining time alarm 0x02/0x03 Sets RemainingTimeAlarm (0x02) 16 bits minutes
Remaining capacity alarm 0x04/0x05 Sets RemainingCapacityAlarm (0x01) 16 bits mAh
Reserved 0x06/0x07 Reserved for future use 16 bits NA
Initial charging current 0x08/0x09 Sets the initial charging current 16 bits mA
Charging voltage 0x0a/0x0b Sets ChargingVoltage (0x15) 16 bits mV
Battery status 0x0c/0x0d Initializes BatteryStatus (0x16) 16 bits NA
Cycle count 0x0e/0x0f Initializes and stores CycleCount (0x17) 16 bits cycles
Design capacity 0x10/0x11 Sets DesignCapacity (0x18) 16 bits mAh
Design voltage 0x12/0x13 Sets DesignVoltage (0x19) 16 bits mV
Specification information 0x14/0x15 Programs SpecificationInfo (0x1a) 16 bits NA
Manufacture date 0x16/0x17 Programs ManufactureDate (0x1b) 16 bits NA
Serial number 0x18/0x19 Programs SerialNumber (0x1c) 16 bits NA
Fast-charging current 0x1a/0x1b Sets ChargingCurrent (0x14) 16 bits mA
Maintenance-charge current 0x1c/0x1d Sets the trickle current request 16 bits mA
Reserved 0x1e/0x1f Reserved must = 0x0000 16 bits mAh
Manufacturer name 0x20-0x2b Programs ManufacturerName (0x20) 96 bits NA
Current overload 0x2c/0x2d Sets the overload current threshold 16 bits mA
Battery low % 0x2e Sets the battery low amount 8 bits %
Reserved 0x2f Reserved for future use 8 bits NA
Device name 0x30-0x37 Programs DeviceName (0x21) 64 bits NA
Li-Ion taper current 0x38/0x39
Sets the upper limit of the taper current for charge
termination
16 bits mA
Maximum overcharge limit 0x3a/0x3b Sets the maximum amount of overcharge 16 bits NA
Reserved 0x3c Reserved must = 0x00 8 bits NA
Access protect 0x3d Locks commands outside of the SBS data set 8 bits NA
FLAGS1 0x3e Initializes FLAGS1 8 bits NA
FLAGS2 0x3f Initializes FLAGS2 8 bits NA
Device chemistry 0x40-0x45 Programs DeviceChemistry (0x22) 48 bits NA
Current measurement gain 0x46/0x47 Sense resistor calibration value 16 bits NA
Battery voltage offset 0x48 Voltage calibration value 8 bits NA
Temperature offset 0x49 Temperature calibration value 8 bits NA
Maximum temperature and
∆T step
0x4a
Sets the maximum charge temperature and the ∆T
step for ∆T/∆t termination
8 bits NA
Table 1. Configuration Memory Map