BQ24257 Datasheet, PDF (30/45 Pages) Texas Instruments – 2A Single Input I2C, Standalone Switch-Mode Li-Ion Battery Charger with Integrated Current Sense Resistor

bq24257
bq24258
SLUSBG0B – FEBRUARY 2013 – REVISED JULY 2013
Register #3
Memory location: 02, Reset state: 1000 1111
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BIT
B7(MSB)
B6
B5
B4
B3
B2
B1⁽⁴⁾⁽⁵⁾
NAME
V_{BATREG_5} ⁽¹⁾
V_{BATREG_4} ⁽¹⁾
V_{BATREG_3} ⁽¹⁾
V_{BATREG_2} ⁽¹⁾
V_{BATREG_1} ⁽¹⁾
V_{BATREG_0} ⁽¹⁾
USB_DET_1/EN1
B0(LSB) USB_DET_0/EN0
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read Only
Read Only
FUNCTION
Battery Regulation Voltage: 640mV (default 1)
Battery Regulation Voltage: 320mV (default 0)
Battery Regulation Voltage: 160mV (default 0)
Battery Regulation Voltage: 80mV (default 0)
Battery Regulation Voltage: 40mV (default 1)
Battery Regulation Voltage: 20mV (default 1)
Return USB detection result or pin EN1/EN0 status –
00 – DCP detected / EN1=0, EN0=0
01 – CDP detected / EN1=0, EN0=1
10 – SDP detected / EN1=1, EN0=0
11 – Apple/TT or non-standard adaptor detected/EN1=1, EN0=1
(1) Charge voltage range is 3.5V—4.44V with the offset of 3.5V and step of 20mV (default 4.2V)
• V_BATREG – Sets the battery regulation voltage
• USB_DET/EN – Provides status of the D+/D– detection results for spins that include the D+/D– pins or the
state of EN1/EN2 for spins that include the EN1/EN2 pins.
Register #4
Memory location: 03, Reset state: 0000 0000
BIT
B7(MSB)
B6
B5
B4
B3
B2
B1
B0(LSB)
NAME
I_{CHG_4} ^{(1) (2)}
I_{CHG_3} ^{(1) (2)}
I_{CHG_2} ^{(1) (2)}
I_{CHG_1} ^{(1) (2)}
I_{CHG_0} ^{(1) (2)}
I_{TERM_2} ⁽³⁾
I_{TERM_1} ⁽³⁾
I_{TERM_0} ⁽³⁾
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
FUNCTION
Charge current 800mA – (default 0)
Charge current: 400mA – (default 0)
Charge current: 200mA – (default 0)
Charge current: 100mA – (default 0)
Charge current: 50mA – (default 0)
Termination current sense threshold: 100mA (default 0)
Termination current sense threshold: 50mA (default 0)
Termination current sense threshold: 25mA (default 0)
(1) Charge current offset is 500mA and default charge current is 500mA (maximum is 2.0A)
(2) When all bits are 1’s, it is external ISET charging mode
(3) Termination threshold voltage offset is 50mA. The default termination current is 50mA if ICHG is selected from I2C. Otherwise,
termination is set to 10% in external I_set mode with +/-10% accuracy.
• I_CHG – Sets the charge current regulation
• I_TERM – Sets the current level at which the charger will terminate
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