Datasheet

23
bq2040
Description
EEPROM
Address
EEPROM
Hex Contents
Example
Values Notes
Low
Byte
High
Byte
Low
Byte
High
Byte
EEPROM
length
0x00 64 100 Must be equal to 0x64.
EEPROM check 1 0x01 5b 91 Must be equal to 0x5b.
Remaining time
alarm
0x02 0x03 0a 00 10 minutes Sets the low time alarm level.
Remaining
capacity alarm
0x04 0x05 f0 00 240mAh Sets the low capacity alarm level.
Reserved 0x06 0x07 00 00 0 Not currently used by the bq2040.
Initial charging
current
0x08 0x09 60 09
2400mA
Sets the initial charge request.
Charging voltage 0x0a 0x0b d8 40 16600mV
Used to set the fast-charge voltage for the Smart
Charger.
Battery status 0x0c 0x0d 80 00 128 Initializes BatteryStatus.
Cycle count 0x0e 0x0f 00 00 0
Contains the charge cycle count and can be set to zero
for a new battery.
Design capacity 0x10 0x11 60 09 2400mAh Normal battery pack capacity.
Design voltage 0x12 0x13 40 38 14400mV Nominal battery pack voltage.
Specification
information
0x14 0x15 10 00 1.0 Default value for this register in a 1.0 part.
Manufacture
date
0x16 0x17 a1 20
May 1, 1996
= 8353
Packed per the ManufactureDate description.
Serial number 0x18 0x19 12 27 10002 Contains the optional pack serial number.
Fast-charging
current
0x1a 0x1b 60 09 2400mA
Used to set the fast-charge current for the Smart
Charger.
Maintenance
charge current
0x1c 0x1d 00 00 0mA
Contains the desired maintenance current after fast-
charge termination by the bq2040.
Reserved 0x1e 0x1f 00 00 0 Must be programmed to 0x00.
Current
overload
0x2c 0x2d 70 17 6000mA
Sets the discharge current at which EDV threshold
monitoring is disabled.
Battery low % 0x2e 08 3%
Sets the battery capacity that RemainingCapacity is
reduced to at EDV1. The value equals 2.56 ∗ (%RM at
EDV1)
Table 10. Example Register Contents