BQ24180 Datasheet, PDF (30/39 Pages) Texas Instruments – Fully Integrated Switch-Mode One-Cell Li-Ion Charger with Full USB Compliance and Accessory Power Connection

bq24180
SLUSA02 A – FEBRUARY 2010 – REVISED FEBRUARY 2010
www.ti.com
Safety Limit Register (READ/WRITE, Write only once after reset!)
Memory location: 06, Reset state: 0101 0000
BIT
NAME
Read/Write FUNCTION
B7(MSB)
V_MCHRG3
Read/Write Maximum charge current sense voltage: 54.4mV (default 0)
B6
V_MCHRG2
Read/Write Maximum charge current sense voltage: 27.2mV (default 1)
B5
V_MCHRG1
Read/Write Maximum charge current sense voltage: 13.6mV (default 0)
B4
V_MCHRG0
Read/Write Maximum charge current sense voltage: 6.8mV (default 1)
B3
V_MREG3
Read/Write Maximum battery regulation voltage: 160mV (default 0)
B2
V_MREG2
Read/Write Maximum battery regulation voltage: 80mV (default 0)
B1
V_MREG1
Read/Write Maximum battery regulation voltage: 40mV (default 0)
B0(LSB)
V_MREG0
Read/Write Maximum battery regulation voltage: 20mV (default 0)
• Maximum charge current sense voltage offset is 550mA (default at 950mA) and the maximum charge current
option is 1.55A, if 68-mΩ sensing resistor is used.
• Maximum battery regulation voltage offset is 4.2V (default at 4.2V) and maximum battery regulation voltage
option is 4.44V.
• Memory location 06 resets only when V_BAT voltage drops below V_SHORT threshold (typ. 2.0V) goes to logic '0'.
During reset, the maximum values in 06H keep the default value regardless of the write action to this register.
After reset (V_BAT>V_SHORT), the maximum values for battery regulation voltage and charge current can be
programmed many times 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 default values hold!
blank paragraph for spacer
BIT
B7(MSB)
B6
B5
B4
B3
B2
B1
B0(LSB)
NTC Monitor Register (READ/WRITE) – Memory location: 07, Reset state: 100X 0000
NAME
Read/Write FUNCTION
2XTMR_EN
Read/Write 1 – Timer slowed by 2x when in thermal regulation or VIN_HIGH protection,
0 – Timer not slowed at any time (default 1)
TMR_1
TMR_2
Read/Write
Read/Write
Safety Timer Time Limit
00 – 27 minute fast charge,
01 – 3 hour fast charge,
10 – 6 hour fast charge,
11 – Disable safety timers (default 00)
NA
Read/Write NA
TS_/EN
Read/Write 1 – TS function disabled,
0 – TS function enabled (default 0)
TS_FAULT2
TS_FAULT1
TS_FAULT0
Read only
Read only
Read only
TS Fault Mode:
000 – TS temp < 5°C or TS temp > 55°C,
010 – Normal, No TS fault,
011 – 45°C < TS temp < 55°C,
100–111 – TS Open
30
Submit Documentation Feedback
Product Folder Link(s): bq24180
Copyright © 2010, Texas Instruments Incorporated