BQ24188_15 Datasheet, PDF (31/52 Pages) Texas Instruments – bq24188 2A, 30V, Host-Controlled Single-Input, Single Cell Switchmode Li-Ion Battery Charger with Power Path Management and USB-OTG Support

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bq24188
SLUSC44A – DECEMBER 2014 – REVISED MAY 2015
9.6.3 Control/Battery Voltage Register (READ/WRITE)
Memory location: 02, Reset state: 0001 0100
Figure 21. Control/Battery Voltage Register
B7(MSB)
B6
B5
B4
B3
B2
B1
B0(LSB)
1
0
0
0
1
1
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
BIT
B7(MSB)
B6
B5
B4
B3
B2
B1
B0(LSB)
FIELD
V_BREG5
V_BREG4
V_BREG3
V_BREG2
V_BREG1
V_BREG0
MOD_FREQ1
MOD_FREQ0
TYPE
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
DESCRIPTION
Battery Regulation Voltage: 640mV (default 0)
Battery Regulation Voltage: 320mV (default 0)
Battery Regulation Voltage: 160mV (default 0)
Battery Regulation Voltage: 80mV (default 1)
Battery Regulation Voltage: 40mV (default 0)
Battery Regulation Voltage: 20mV (default 1)
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)
V_BREG Bits (Battery Regulation Threshold setting)
Use V_BREG bits to set the battery regulation threshold. The VBATREG is calculated using the following
equation:
indent V_BATREG = 3.5 V + V_BREGCODE × 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 V_BATREG
above V_MINSYS.
MOD_FREQx Bits (Frequency Modification)
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.
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