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BQ24187 Datasheet, PDF (28/44 Pages) Texas Instruments – 1A USB-OTG Support
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bq24187
SLUSBM0 – APRIL 2014
Not Recommended for New Designs
www.ti.com
BIT
B7 (MSB)
B6
B5
B4
B3
B2
B1
B0 (LSB)
NAME
VBREG5
VBREG4
VBREG3
VBREG2
VBREG1
VBREG0
MOD_FREQ1
MOD_FREQ2
Table 4. Control/Battery Voltage Register (Read/Write)
Memory Location: 02, Reset State: 0001 0100
READ/WRITE
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
FUNCTION
Battery Regulation Voltage: 640 mV (default 0)
Battery Regulation Voltage: 320 mV (default 0)
Battery Regulation Voltage: 160 mV (default 0)
Battery Regulation Voltage: 80 mV (default 0)
Battery Regulation Voltage: 40 mV (default 1)
Battery Regulation Voltage: 20 mV (default 0)
Modify Switching Frequency Target –
00 – No Change to Nominal Frequency Target
01 – +10% Change to Nominal Frequency
10 – –10% Change to Nominal Frequency
11 – NA (default 00)
VBREG Bits
(Battery Regulation
Threshold setting)
MOD_FREQx Bits
(Frequency
Modification)
Use VBREG bits to set the battery regulation threshold. The VBATREG is calculated
using the following equation:
VBATREG = 3.5 V + VBREGCODE × 20 mV
The charge voltage range is 3.5V to 4.44V with the offset of 3.5V and step of 20mV.
The default setting is 3.6V. If a value greater than 4.44V is written, the setting goes to
4.44V. It is recommended to set VBATREG above VMINSYS.
The MOD_FREQx bits are used to change the switching frequency by ±10%. This is
used for applications where the 1.5MHz switching frequency noise interferes with
other device operation. The frequency may be modified by ±10% of the nominal
frequency.
BIT
B7 (MSB)
B6
B5
B4
B3
B2
B1
B0 (LSB)
NAME
Vender2
Vender1
Vender0
PN1
PN0
Revision2
Revision1
Revision0
Table 5. Vender/Part/Revision Register (Read only)
Memory Location: 03, Reset State: 0100 0110
READ/WRITE
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Vender Code: bit 2 (default 0)
Vender Code: bit 1 (default 1)
Vender Code: bit 0 (default 0)
FUNCTION
For I2C Address 6Bh: 00–bq24187
Revision Code
28
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