BQ27546-G1 Datasheet, PDF (27/38 Pages) Texas Instruments – nullSingle-Cell Li-Ion Battery Fuel Gauge

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bq27546-G1
SLUSC53A – MAY 2015 – REVISED DECEMBER 2015
Typical Applications (continued)
NAME
Sleep Current
Charge T0
Charge T1
Charge T2
Charge T3
Charge T4
Charge Current T0
Charge Current T1
Charge Current T2
Charge Current T3
Charge Current T4
Charge Voltage T0
Charge Voltage T1
Charge Voltage T2
Charge Voltage T3
Charge Voltage T4
Chg Temp Hys
Chg Disabled
Regulation V
CC Gain
CC Delta
CC Offset
Board Offset
Pack V Offset
Table 12. Key Data Flash Parameters for Configuration (continued)
DEFAULT
15
0
10
45
50
60
50
50
50
50
0
210
210
207
205
0
5
4200
10
10
–1418
0
0
UNIT
mA
°C
°C
°C
°C
°C
% Des Cap
% Des Cap
% Des Cap
% Des Cap
% Des Cap
20 mV
20 mV
20 mV
20 mV
20 mV
°C
mV
mΩ
mΩ
Counts
Counts
mV
RECOMMENDED SETTING
Sets the threshold at which the fuel gauge enters SLEEP mode. Take care in
setting above typical standby currents else entry to SLEEP may be
unintentionally blocked.
Sets the boundary between charging inhibit and charging with T0 parameters.
Sets the boundary between charging with T0 and T1 parameters.
Sets the boundary between charging with T1 and T2 parameters.
Sets the boundary between charging with T2 and T3 parameters.
Sets the boundary between charging with T3 and T4 parameters.
Sets the charge current parameter for T0.
Sets the charge current parameter for T1.
Sets the charge current parameter for T2.
Sets the charge current parameter for T3.
Sets the charge current parameter for T4.
Sets the charge voltage parameter for T0.
Sets the charge voltage parameter for T1.
Sets the charge voltage parameter for T2.
Sets the charge voltage parameter for T3.
Sets the charge voltage parameter for T4.
Adds temperature hysteresis for boundary crossings to avoid oscillation if
temperature is changing by a degree or so on a given boundary.
Sets the voltage threshold for voltage regulation to system when charge is
disabled. It is recommended to program to same value as Charging Voltage
and maximum charge voltage that is obtained from Charge Voltage T0–4
parameters.
Calibrate this parameter using TI-supplied bqStudio software and calibration
procedure in the TRM. Determines conversion of coulomb counter measured
sense resistor voltage to current.
Calibrate this parameter using TI-supplied bqStudio software and calibration
procedure in the TRM. Determines conversion of coulomb counter measured
sense resistor voltage to passed charge.
Calibrate this parameter using TI-supplied bqStudio software and calibration
procedure in the TRM. Determines native offset of coulomb counter hardware
that should be removed from conversions.
Calibrate this parameter using TI-supplied bqStudio software and calibration
procedure in the TRM. Determines native offset of the printed circuit board
parasitics that should be removed from conversions.
Calibrate this parameter using TI-supplied bqStudio software and calibration
procedure in the TRM. Determines voltage offset between cell tab and ADC
input node to incorporate back into or remove from measurement, depending
on polarity.
10.2.2 Detailed Design Procedure
10.2.2.1 BAT Voltage Sense Input
A ceramic capacitor at the input to the BAT pin is used to bypass AC voltage ripple to ground, greatly reducing
its influence on battery voltage measurements. It proves most effective in applications with load profiles that
exhibit high-frequency current pulses (that is, cell phones), but is recommended for use in all applications to
reduce noise on this sensitive high-impedance measurement node.
Copyright © 2015, Texas Instruments Incorporated
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