参数资料
| 型号： | SC900841JVKR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 161/192页 |
| 文件大小： | 0K |
| 描述： | IC POWER MGT 338-MAPBGA |
| 标准包装： | 2,000 |
| 应用： | PC，PDA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 338-TFBGA |
| 供应商设备封装： | 338-MAPBGA |
| 包装： | 带卷 (TR) |
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FUNCTIONAL DEVICE OPERATION
ADC SUBSYSTEM
BATTERY VOLTAGE
The battery voltage is read at the VBAT pin at channel 6.
The battery voltage is first scaled by subtracting 2.40 V in
order to fit the input range of the ADC.
Table 101. Battery Voltage Reading Coding
terminal voltage at VBAT and the voltage difference between
VBAT and ISNSBATN are sampled simultaneously, but
converted one after the other. This is done to efficiently
perform the voltage and current reading at the same time.
The voltage difference between VBAT and ISNSBATN is
first amplified to fit the ADC input range as V(VBAT -
Conversion Code
1 111 111 111
1 000 010 100
0 000 000 000
Voltage at ADC input
2.400 V
1.250 V
0.000 V
Voltage at VBAT
4.800 V
2.500 V
0.000 V
VISNSBATN)*20. Since battery current can flow in both
directions, the conversion is read out in 2's complement
format. Positive readings correspond to the current flow out
of the battery, and negative readings to the current flowing
into the battery.
The value of the sense resistor used, determines the
BATTERY CURRENT
The current flowing out of and into the battery can be read
via the ADC by monitoring the voltage drop across the sense
resistor between the VBAT and ISNSBATN pins. The battery
Table 102. Battery Current Reading Coding
accuracy of the result as well as the available conversion
range. Note that excessively high values can impact the
operating life of the system, due to extra voltage drop across
the sense resistor.
Conversion Code
0 111 111 111
0 000 000 001
0 000 000 000
1 111 111 111
1 000 000 000
Voltage at ADC input ADC
1200 mV
2.346 mV
0.000 mV
-2.346 mV
-1200 mV
V BAT -V ISNSBAT
60.000 mV
0.117 mV
0.000 mV
-0.117 mV
-60.000 mV
Current Through 20 m
3.000 A
0.0059 A
0.000 A
0.0059 A
3.000 A
Current Flow
From Battery
From Battery
-
To Battery
To Battery
CHARGER INPUT VOLTAGE
One of the spare options is to read the charger voltage
measured at the RAWCHG pin at Channel 8. The charger
voltage is first scaled in order to fit the input range of the ADC.
Table 103. Charger Input Voltage Reading Coding
corresponding scaling factor of 1 (for an input range of 2.0 V)
and a gain of 1 sets a corresponding scaling factor of 10 (for
an input range of 200 mV).
Table 104. General Purpose Analog Inputs Reading
Coding
Conversion Code
1 101 010 100
0 000 000 000
Voltage at ADC input
2.000 V
0.000 V
Voltage at VBAT
20.000 V
0.000 V
Conversion Code
1 111 111 111
1 011 111 111
Voltage at ADC
input
2.400
1.800
Voltage at ADINx
Input
0.200
0.150
GAIN
1
BATTERY THERMISTOR
Channel 9 is used to read out the battery pack thermistor.
0 011 111 111
0 000 000 000
0.600
0.000
0.050
0.000
The thermistor will have to be biased with an external pull-up
to a voltage rail greater than the ADC input range. In order to
save current when the thermistor reading is not required, the
thermistor is biased from VCORE through a cutoff switch
connected to VNTC pin. A resistor divider network should
assure the resulting voltage falls within the ADC input range.
1 111 111 111
1 011 111 111
0 011 111 111
0 000 000 000
2.400
1.800
0.600
0.000
2.000
1.500
0.500
0.000
0
GENERAL PURPOSE ANALOG INPUTS
There are twelve general purpose analog input channels
that can be measured through the ADIN10-ADIN21 pins. Two
voltage scaling (gain) settings can be selected to
accommodate a wider range of inputs through the
ADCCNTL3 and ADCCNTL4 registers. A gain of 0 sets a
APPLICATION SUPPLY (IF USED)
Channel 22 can be used to read the application supply
voltage at the VPWR pin. This can be enabled by setting the
VPWRCON bit in the FSLADCCNTL register high. The
battery voltage is first scaled as VPWR/2 in order to fit the
input range of the ADC.
900841
Analog Integrated Circuit Device Data
Freescale Semiconductor
161
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