Temperature ()
CellVoltagex()
P
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:
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re
Pre-Charge: Current
Fast -Charge Current
C
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:
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ig
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ig
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Pre-Charge: Voltage
47
SLUUBD3D – September 2015 – Revised September 2018
Copyright © 2015–2018, Texas Instruments Incorporated
Charge Algorithm
Chapter 5
SLUUBD3D – September 2015 – Revised September 2018
Charge Algorithm
5.1
Introduction
The device can change the values of
ChargingVoltage()
and
ChargingCurrent()
based on
Temperature()
,
Cell Voltage1..15()
and system fault conditions. The
ChargingStatus()
register shows the state of the
charging algorithm.
5.2
Fast and Pre-Charging
The charging algorithm adjusts
ChargingCurrent()
and
ChargingVoltage()
to allow the appropriate charging
conditions to be read.
Current State
Condition
Action
Fast Charging
Temperature()
>
Precharge Temp
+
Hysteresis
Temp
AND
ALL
CellVoltages1..15()
> Pre-Charging:
Recovery Voltage
AND
GaugingStatus() [EDV0]
= 0
ChargingStatus()[FCHG]
= 1
ChargingStatus()[PCHG]
= 0
ChargingVoltage()
=
Fast Charging: Voltage
ChargingCurrent()
=
Fast Charging: Current
Pre-Charging
Temperature()
≤
Pre-Charging:
Precharge Temp
+
Hysteresis Temp
OR
ANY
CellVoltages1..15()
≤
Pre-Charging: Start
Voltage
OR
GaugingStatus() [EDV0]
= 1
ChargingStatus()[FCHG]
= 0
ChargingStatus()[PCHG]
= 1
ChargingVoltage()
=
Fast Charging: Voltage
ChargingCurrent()
=
Pre-Charging: Current
Depending on the
FET Options[PCHG_EN]
settings, the external precharge FET or CHG FET can be
used in PRE-CHARGE mode. Setting the
Pre-Charging Current
= 0 mA disables the precharge function
by requesting 0 mA charging current from the charger.
