PS401-I/SS Microchip Technology, PS401-I/SS Datasheet - Page 15

• Manufacturer Part Number: PS401-I/SS
• Description: IC FUEL GAUGE BATTERY MGR 28SSOP
• Manufacturer: Microchip Technology

Specifications of PS401-I/SS

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5.1
For a typical lithium ion constant-current/constant-
voltage charge system, the PS401 will monitor the
taper current that enters the battery once the battery
has reached the final voltage level of the charger. Once
the taper current falls to a certain level indicating that
the battery is full, the End-Of-Charge (EOC) will be
triggered. Different taper currents will be used for
different temperatures. See the parameter explanation
in the programming section for details.
When a valid fully charged EOC condition is detected,
the following actions occur:
• The FULLY_CHARGED status bit (bit 5) in the
• RelativeStateOfCharge is set to 100%.
• ChargingCurrent is set to ChrgCurrOff value.
• SBData value for MaxError is cleared to zero
• The TERMINATE_CHARGE_ALARM bit (bit 14)
• The OverChrg value is incremented for any
• Control flags for internal operations are set to
• Other BatteryStatus or AlarmWarning flag bits
 2003 Microchip Technology Inc.
SBData value of BatteryStatus is set to one to
indicate a full condition. (This will remain set
until RelativeStateOfCharge drops below the
ClrFullyChrg value in OTP EPROM.)
percent (0%).
is set in BatteryStatus and an AlarmWarning
broadcast is sent to the SMBus Host and Smart
Battery Charger addresses.
charge received above 100% after a valid fully
charged EOC condition.
indicate a valid full charge condition was
achieved.
may also be set depending on the conditions
causing the EOC.
Full Charge Detection Methods
5.2
The PS401 SMBus Smart Battery IC provides multiple
temperature alarm set points and charging conditions.
The following EEPROM and OTP EPROM parameters
control how the temperature alarms and charging
conditions operate.
HighTempAl: When the measured temperature is
greater than HighTempAl, the Over_Temp_Alarm is
set.
Terminate_Charge_Alarm is also set.
ChrgMinTemp, DischrgMaxTemp and ChrgMaxTemp:
If the measured temperature is less than ChrgMinTemp,
the ChargingCurrent is set to ChrgCurrOff and the
ChargingVoltage is set to ChrgVolt to communicate to
the charger that the non-charging state of current and
voltage should be given. When measured temperature
is greater than ChrgMaxTemp and the system is charg-
ing, or greater than DischrgMaxTemp and the system is
discharging, then ChargingCurrent is set to ChrgCurrOff
and the ChargingVoltage is set to ChrgVoltOff
also. Otherwise ChargingCurrent = ChrgCurr and
ChargingVoltage = ChrgVolt.
If
Temperature Algorithms
the
battery
is
charging,
DS40238B-page 15
PS401
then
the