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| 型号： | PS501T-I/SS |
| 厂商： | Microchip Technology |
| 文件页数： | 10/42页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MANAGER REPROG 28SSOP |
| 标准包装： | 1 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 5.6 V ~ 18 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 标准包装 |
| 其它名称： | PS501T-I/SSDKR |
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PS501
4.0
CAPACITY MONITORING
The total capacity added or subtracted from the battery
(change in charge) per measurement period is
The PS501 internal CPU uses the voltage, current and
temperature data from the A/D converter, along with
parameters and cell models, to determine the state of the
battery and to process the SBData function instruction
set.
expressed by the following formula:
EQUATION 4-1:
? Charge = Σ i ? t (the current integrated over time)
By integrating measured current, monitoring voltages
and temperature, adjusting for self-discharge and
checking for End-Of-Charge and End-Of-Discharge
conditions, the PS501 creates an accurate fuel gauge
under all battery conditions.
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CurrError (Current Measurement Error)
PwrConsumption * ? t (PS501 I DD )
% of Self-Discharge * FCC
SelfDischrgErr (Self-Discharge Error)
4.1
Capacity Calculations
The error terms are always subtracted, even though
they are +/- errors, so that the fuel gauge value will
The PS501 calculates State-Of-Charge and fuel gaug-
ing functions using a ‘coulomb counting’ method, with
additional inputs from battery voltage and temperature
measurements. By continuously and accurately mea-
suring all the current into and out of the battery cells,
along with accurate three-dimensional cell models, the
PS501 is able to provide accurate predictions of SOC
and run-time.
The capacity calculations consider two separate states:
charge acceptance or Capacity Increasing (CI) and dis-
never be overestimated. Current draw of the PS501
and the self-discharge terms are also always
subtracted. The SBData value, MaxError , is the total
accumulated error as the gas gauge is running.
The battery current will be precisely measured and
integrated in order to calculate total charge removed
from or added to the battery. Based on look-up table
values, the capacity is adjusted for self-discharge
relative to current, temperature and SOC.
charge or Capacity Decreasing (CD). The CI state only
occurs when a charge current larger than the EEPROM
4.2
Discharge Termination
NullCurr value is measured. Otherwise, while at rest
and/or while being discharged, the state is CD.
Conditions must persist for at least NChangeState
measurement periods for a valid state change between
CD and CI. A minimum value of 2 is suggested for
NChangeState .
Regardless of the CI or CD state, self-discharge is also
calculated and subtracted from the integrated capacity
values. Even when charging, there is still a self-discharge
occurring in the battery.
To compensate for known system errors in the capacity
calculations, a separate error term is also continuously
calculated. This term is the basis for the SBData value
of MaxError. Two error values are located in EEPROM.
The CurrError value is the inherent error in current
measurements and should be set based on the selec-
tion of a sense resistor and calibration results. The
SelfDischrgErr value is the error in the parameter
tables for self-discharge and depends on the accuracy
of the cell chemistry model for self-discharge.
Since the PS501 electronics also drain current from the
battery system, another EEPROM value allows even
this minor drain to be included in the capacity calcula-
tions. The PwrConsumption value represents the
drain of the IC and associated circuitry, including
additional safety monitoring electronics if present. A
typical value of 77 represents the module’s nominal
power consumption, including the PS501 typical
consumption.
DS21818C-page 10
Discharge termination is determined based on the
End-Of-Discharge (EOD) voltage point. The voltage
level at which this point occurs can be chosen to be
constant, or to change depending on the temperature
and discharge rate, since these factors affect the volt-
age curve and total capacity of the battery. The EOD
voltage parameter table predicts the voltage point at
which this EOD will be reached, based on discharge
rate and temperature.
The PS501 will monitor temperature and discharge rate
continuously and update the Veodx in real-time. When
the voltage measured on the cell is below EOD voltage
for the duration of EODRecheck x periods (500 ms), a
valid EOD has occurred.
When a valid EOD has been reached, the
TERMINATE_DISCHARGE_ALARM bit (bit 11) in
BatteryStatus will be set. This will cause an
AlarmWarning condition with this bit set.
Additionally, the REMAINING_TIME_ALARM and/or
REMAINING_CAPACITY_ALARM bits can be set first to
give a user defined early warning prior to the
TERMINATE_DISCHARGE_ALARM. The remaining
time alarm will trigger in battery status when the remain-
ing time calculation falls below a threshold set by the
SMBus command. The remaining capacity alarm will be
set in battery status when the capacity falls below a
threshold set by the SMBus command. Use an SMBus
Write command to Remaining TimeAlarm (command
code 0x02) or RemainingCapacityAlarm (command
code 0x01) to set these values.
? 2004 Microchip Technology Inc.
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