BQ24157S Datasheet, PDF (28/45 Pages) Texas Instruments – Full USB Compliance and USB-OTG Support

Not Recommended for New Designs
bq24157S
SLUSB76B – FEBRUARY 2013 – REVISED MAY 2015
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Table 9. Special Charger Voltage/Enable Pin Status Register
Memory Location: 05, Reset state: 000X X100^{(1) (2)}
BIT
B7 (MSB)
B6
NAME
NA
FAC_MODE
B5
LOW_CHG
B4
DPM_STATUS
B3
B2
B1
B0 (LSB)
CD_STATUS
VSREG2
VSREG1
VSREG0
Read or Write
Read or Write
Read or Write
Read or Write
Read only
Read only
Read or Write
Read or Write
Read or Write
FUNCTION
NA
0 – Disables factory test mode
1 – Enables the factory test mode
0 – Normal charge current sense voltage at 04H,
1 – Low charge current sense voltage of 22.1 mV (default 0)
0 – DPM mode is not active,
1 – DPM mode is active
0 – CD pin at LOW level,
1 – CD pin at HIGH level
Special charger voltage: 320mV step (default 1)
Special charger voltage: 160mV step (default 0)
Special charger voltage: 80mV step (default 0)
(1) Special charger voltage offset is 4.2 V and default special charger voltage is 4.52 V.
(2) Default charge current will be 550 mA, if 68-mΩ sensing resistor is used, since default LOW_CHG = 0.
Table 10. Safety Limit Register (Read or Write, Write Only One Time After Reset)
Memory Location: 06, Reset State: 01000000
BIT
B7 (MSB)
B6
B5
B4
B3
B2
B1
B0 (LSB)
NAME
V_MCHRG3 ⁽¹⁾
V_MCHRG2 ⁽¹⁾
V_MCHRG1 ⁽¹⁾
V_MCHRG0 ⁽¹⁾
V_MREG3
V_MREG2
V_MREG1
V_MREG0
Read or Write
Read or Write
Read or Write
Read or Write
Read or Write
Read or Write
Read or Write
Read or Write
Read or Write
FUNCTION
Maximum charge current sense voltage: 54.4-mV step (default 0) ⁽²⁾
Maximum charge current sense voltage: 27.2-mV step (default 1)
Maximum charge current sense voltage: 13.6-mV step (default 0)
Maximum charge current sense voltage: 6.8-mV step (default 0)
Maximum battery regulation voltage: 160-mV step (default 0)
Maximum battery regulation voltage: 80-mV step (default 0)
Maximum battery regulation voltage: 40-mV step (default 0)
Maximum battery regulation voltage: 20-mV step (default 0)
(1) Refer to Table 13
SPACE
• Maximum charge current sense voltage offset is 37.4 mV (550 mA), default at 64.6 mV (950 mA) and the
maximum charge current option is 1.55 A (105.4 mV), if 55-mΩ sensing resistor is used.
• Maximum battery regulation voltage offset is 4.2 V (default at 4.2 V) and maximum battery regulation voltage
option is 4.44 V.
• Memory location 06H resets only when V_(CSOUT) drops below either 1) V_(SHORT) threshold (typical 2.05 V) if
VBUS>V(UVLO) or 2) the digital reset threshold (typ 2.4V) if VBUS<V(UVLO). After reset, the maximum
values for battery regulation voltage and charge current can be programmed until any writing to other register
locks the safety limits. Programmed values exclude higher values from memory locations 02 (battery
regulation voltage), and from memory location 04 (fast charge current).
• If host accesses (write command) to some other register before safety limit register, the safety default values
are used.
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