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| 型号： | PS501T-I/SS |
| 厂商： | Microchip Technology |
| 文件页数： | 13/42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
5.0
CHARGE CONTROL
When ChargingCurrent is set to the ChrgCurrOff value,
no broadcasts of either ChargingCurrent or Charging-
A SBS configuration normally allows the Smart Battery
to broadcast the ChargingVoltage and ChargingCurrent
values to the Smart Battery Charger (SMBus address
12 hex) to ‘control’ when to start charge, stop charge
and when to signal a valid ‘fully charged’ condition.
AlarmWarnings are also sent from the Smart Battery
(SMBus address 16 hex) to the Smart Battery Charger.
Alternately, the SMBus Host or a “Level 3” Smart
Battery Charger may simply read the SBData values
for ChargingVoltage and ChargingCurrent from the
Smart Battery directly. The Host or “Level 3” Smart
Battery Charger is also required to read the SBData
value of BatteryStatus to obtain the appropriate alarm
and status bit flags. When used in this configuration,
the ChargingCurrent and ChargingVoltage broadcasts
can be disabled from the Smart Battery by setting the
CHARGER_MODE (bit 14) in the BatteryMode regis-
ter. The PS501 ICs support all of these functions.
(Please refer to the SBS Smart Battery Charger
Specification for a definition of the “Level 3” Smart
Battery Charger.)
The ChargingCurrent and ChargingVoltage registers
contain the maximum charging parameters desired by
the particular chemistry, configuration and environmen-
tal conditions. The environmental conditions include
the measured temperature and the measured cell or
pack voltages.
For Li-based systems, ChargingVoltage should be set
to the product of the EOCVolt and Cells values from
Voltage will occur unless a charge current greater than
NullCurr is detected by the A/D measurements.
Temperature limits are set using the ChrgMaxTemp ,
DischrgMaxTemp and ChrgMinTemp values from
EEPROM. These values represent the temperature
limits within which ChargingCurrent will be set to
ChrgCurr . Temperatures outside these limits will cause
ChargingCurrent to be set to ChrgCurrOff.
If ChargingCurrent is set to ChrgCurrOff and the mea-
sured temperature is greater than DischrgMaxTemp
and less than ChrgMaxTemp and a charge current is
measured which is significantly larger than the
ChrgCurrOff value, then ChargingCurrent will be set to
ChrgCurr unless a fully charged condition has already
been reached.
If the CHARGER_MODE bit in the BatteryMode regis-
ter is cleared (enabling broadcasts of ChargingCurrent
and ChargingVoltage), then these broadcasts will occur
every NChrgBroadcast measurement cycle.
The Smart Battery Data and Smart Battery Charger
Specifications require that ChargingCurrent and
ChargingVoltage broadcasts occur no faster than once
per 5 seconds and no slower than once per 60 seconds
when charging is occurring or desired. This requires
that the NChrgBroadcast value must be set between
10 and 120. The SMBus Specification also requires
that no broadcasts occur during the first 10 seconds
after SMBus initialization.
the EEPROM:
EXAMPLE 5-1:
CONFIGURATION
EQUATION 5-1:
Measurement cycle is 500 msec
NChrgBroadcast = 100 decimal
ChargingVoltage = EOCVolt x Cells
ChrgCurr
ChrgCurrOff
= 2500 decimal
= 10 decimal
The ChargingCurrent value is set to a maximum using
the ChrgCurr value from the EEPROM. For Lithium
systems, both ChargingCurrent and ChargingVoltage
values are maximums. When the current reaches
ChrgCurr , it will be held constant at this value. Then,
when the voltage reaches ChrgVolt , the current must
be reduced so that the voltage will be constant and not
exceed the maximum. This is accomplished by setting
ChargingCurrent to ChrgCurrOff . For safety reasons,
this current change also occurs when the temperature
limits are exceeded. When temperature or voltage lim-
its are exceeded, the value of ChargingCurrent
changes to the ChrgCurrOff value from the EEPROM.
When a valid End-Of-Charge (EOC) condition is
detected and a fully charged state is reached, the
ChargingCurrent value is set equal to the ChrgCurrOff
value.
? 2004 Microchip Technology Inc.
ChrgMaxTemp = 162 decimal
DischrgMaxTemp = 137 decimal
ChrgMinTemp = 50 decimal
Results:
ChargingCurrent and ChargingVoltage broadcasts:
100 cycles of 500 msec = every 50 seconds
Broadcast delay after SMBus initialization:
10 seconds
ChargingCurrent if Temperature > 45°C: 10 mA
ChargingCurrent if Temperature < 0°C: 10 mA
ChargingCurrent if Temperature < 35°C and
> 0°C: 2500 mA
DS21818C-page 13
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