BQ24725A_17 Datasheet, PDF (25/47 Pages) Texas Instruments – 1-4 Cell Li+ Battery SMBus Charge Controller with N-Channel Power MOSFET Selector and Advanced Circuit Protection

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bq24725A
SLUSAL0A – SEPTEMBER 2011 – REVISED AUGUST 2014
8.5.4 Setting the Charge Voltage
To set the output charge regulation voltage, write a 16bit ChargeVoltage() command (0x15H or 0b00010101)
using the data format listed in Table 5. The bq24725A provides charge voltage range from 1.024V to 19.200V,
with 16mV step resolution. Sending ChargeVoltage() below 1.024V or above 19.2V clears the register and
terminates charging. Upon POR, charge voltage limit is 0V.
The SRN pin is used to sense the battery voltage for voltage regulation and should be connected as close to the
battery as possible, and place a decoupling capacitor (0.1µF recommended) as close to the IC as possible to
decouple high frequency noise.
Figure 16. Charge Voltage Register (0x15H)
15
Not in use
R/W
14
13
Charge
Charge
Voltage, DACV Voltage, DACV
10
9
R/W
12
11
Charge
Charge
Voltage, DACV Voltage, DACV
8
7
R/W R/W
10
Charge
Voltage, DACV
6
R/W
9
Charge
Voltage, DACV
5
R/W
8
Charge
Voltage, DACV
4
R/W
7
6
5
4
Charge
Charge
Charge
Charge
Voltage, DACV Voltage, DACV Voltage, DACV Voltage, DACV
3
2
1
0
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
3
Not in use
R/W
2
Not in use
R/W
1
Not in use
R/W
0
Not in use
R/W
Table 5. Charge Voltage Register (0x15H)
Bit Field
[15] Not in use
[14] Charge Voltage, DACV 10
[13] Charge Voltage, DACV 9
[12] Charge Voltage, DACV 8
[11] Charge Voltage, DACV 7
[10] Charge Voltage, DACV 6
[9]
Charge Voltage, DACV 5
[8]
Charge Voltage, DACV 4
[7]
Charge Voltage, DACV 3
[6]
Charge Voltage, DACV 2
[5]
Charge Voltage, DACV 1
[4]
Charge Voltage, DACV 0
[3]
Not in use
[2]
Not in use
[1]
Not in use
[0]
Not in use
Type
Reset
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Not used.
0 = Adds 0mV of charger voltage.
1 = Adds 16384mV of charger voltage.
0 = Adds 0mV of charger voltage.
1 = Adds 8192mV of charger voltage.
0 = Adds 0mV of charger voltage.
1 = Adds 4096mV of charger voltage.
0 = Adds 0mV of charger voltage.
1 = Adds 2048mV of charger voltage.
0 = Adds 0mV of charger voltage.
1 = Adds 1024mV of charger voltage.
0 = Adds 0mV of charger voltage.
1 = Adds 512mV of charger voltage.
0 = Adds 0mV of charger voltage.
1 = Adds 256mV of charger voltage.
0 = Adds 0mV of charger voltage.
1 = Adds 128mV of charger voltage.
0 = Adds 0mV of charger voltage.
1 = Adds 64mV of charger voltage.
0 = Adds 0mV of charger voltage.
1 = Adds 32mV of charger voltage
0 = Adds 0mV of charger voltage.
1 = Adds 16mV of charger voltage.
Not used.
Not used.
Not used.
Not used.
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