BQ24725A_17 Datasheet, PDF (22/47 Pages) Texas Instruments – 1-4 Cell Li+ Battery SMBus Charge Controller with N-Channel Power MOSFET Selector and Advanced Circuit Protection

bq24725A
SLUSAL0A – SEPTEMBER 2011 – REVISED AUGUST 2014
www.ti.com
8.5 Register Maps
8.5.1 Battery-Charger Commands
The bq24725A supports six battery-charger commands that use either Write-Word or Read-Word protocols, as
summarized in Table 2. ManufacturerID() and DeviceID() can be used to identify the bq24725A. The
ManufacturerID() command always returns 0x0040H and the DeviceID() command always returns 0x000BH.
REGISTER ADDRESS
0x12H
0x14H
0x15H
0x3FH
0XFEH
0xFFH
Table 2. Battery Charger Command Summary
REGISTER NAME
ChargeOption()
ChargeCurrent()
ChargeVoltage()
InputCurrent()
ManufacturerID()
DeviceID()
READ/WRITE
Read or Write
Read or Write
Read or Write
Read or Write
Read Only
Read Only
DESCRIPTION
Charger Options Control
7-Bit Charge Current Setting
11-Bit Charge Voltage Setting
6-Bit Input Current Setting
Manufacturer ID
Device ID
POR STATE
0xF902H
0x0000H
0x0000H
0x1000H
0x0040H
0x000BH
8.5.2 Setting Charger Options
By writing ChargeOption() command (0x12H or 0b00010010), bq24725A allows users to change several charger
options after POR (Power On Reset) as shown in Table 3.
Figure 14. Charge Options Register (0x12H)
15
ACOK Deglitch
Time Adjust
14
13
WATCHDOG Timer Adjust
12
11
BAT Depletion Comparator
Threshold Adjust
R/W
R/W
R/W R/W
7
6
5
4
IFAULT_LOW
Comparator
Threshold
Adjust
LEARN Enable IOUT Selection
AC Adapter
Indication
(Read Only)
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
10
EMI Switching
Frequency
Adjust
R/W
2
Not in use
9
EMI Switching
Frequency
Enable
R/W
1
ACOC
Threshold
Adjust
8
IFAULT_HI
Comparator
Threshold
Adjust
R/W
0
Charge Inhibit
R/W
R/W
R/W
Bit
[15]
[14:13]
Table 3. Charge Options Register (0x12H)
Field
ACOK Deglitch Time Adjust
WATCHDOG Timer Adjust
Type
Reset
R/W
R/W
Description
Adjust ACOK deglitch time.
After POR, the first time the adapter plug in occurs, deglitch time
is always 150ms no matter if this bit is 0 or 1. This bit only sets
the next ACOK deglitch time after ACFET turns off at least one
time. To change this option, VCC pin voltage must be above
UVLO and ACDET pin voltage must be above 0.6V to enable IC
SMBus communication.
0: ACOK rising edge deglitch time 150ms
1: ACOK rising edge deglitch time 1.3s <default at POR>
Set maximum delay between consecutive SMBus Write charge
voltage or charge current command. The charge will be
suspended if IC does not receive write charge voltage or write
charge current command within the watchdog time period and
watchdog timer is enabled.
The charge will be resumed after receive write charge voltage or
write charge current command when watchdog timer expires and
charge suspends.
00: Disable Watchdog Timer
01: Enabled, 44 sec
10: Enabled, 88 sec
11: Enable Watchdog Timer (175s) <default at POR>
22
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