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| 型号： | PS501-I/SS |
| 厂商： | Microchip Technology |
| 文件页数： | 7/42页 |
| 文件大小： | 0K |
| 描述： | IC FIELD REPROG BATT MGR 28SSOP |
| 标准包装： | 47 |
| 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： | 管件 |
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PS501
2.5
Temperature Measurements
CFVPack values.
The A/D receives input from the internal temperature
FIGURE 2-2:
COVPack AND CFVPack
VALUE RELATIONSHIP
sensor to measure the temperature. Optionally, an
external thermistor can be connected to the V NTC pin
which is also monitored by the A/D converter. An output
Raw Measurement
COVPack
Ideal A/D Response
Actual A/D
Response
CFVPack
Actual Voltage
reference voltage for use with an external thermistor is
provided on the V REFT pin. The A/D uses an 11-bit
resolution mode for the temperature measurements.
A standard 10 kOhms at 25°C Negative-Temperature-
Coefficient (NTC) device of the 103ETB type is
suggested for the optional external thermistor. One leg
of the NTC should be connected to the V REFT pin and
the other to both the V NTC pin and a 3.65 kOhms resis-
tor to analog ground (V SSA ). The resistor forms the
lower leg of a voltage divider circuit. To maintain high
accuracy in temperature measurements, a 1% resistor
should be used.
A look-up table is used to convert the voltage measure-
ment seen at the V NTC pin to a temperature value. The
external thermistor should be placed as close as possi-
In-circuit calibration of the voltage is done at the time of
manufacture to obtain absolute accuracy in addition to
high resolution. Individual cell voltage measurements
can be accurate to within ±20 mV.
The individual cell voltage inputs are also calibrated the
same way the pack voltage is. There is one offset value,
COVCell , for all individual cells and up to four different
correction factors, CFVCell1 through CFVCell4 , one for
each cell input.
? 2004 Microchip Technology Inc.
ble to the battery cells and should be isolated from any
other sources of heat that may affect its operation.
Calibration of the temperature measurements involves
a correction factor and an offset exactly like the current
and voltage measurements. The internal temperature
measurement makes use of correction factor CFTempI
and offset COTempI , while the V NTC and V REFT pins for
the optional external thermistor make use of correction
factor CFTempE and offset COTempE .
DS21818C-page 7
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