参数资料
型号: MC34708VM
厂商: Freescale Semiconductor
文件页数: 79/159页
文件大小: 0K
描述: IC POWER MANAGEMENT 206MAPBGA
标准包装: 160
应用: 通用
电源电压: 1.8 V ~ 4.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 206-LFBGA
供应商设备封装: 206-MAPBGA(13x13)
包装: 托盘
Functional Block Description
from address 0 to the stop address programmed in ADSTOP. By default, the ADCONT is set low (disabled). In the continuous
mode, the ADHOLD bit will allow the software to hold the ADC sequencer from updating the results register while the ADC results
are read. Once the sequence of A/D conversions is complete, the ADRESULTx results are stored in 4 SPI registers (ADC 4 -
ADC 7).
7.7.3
7.7.3.1
Dedicated Readings
Channel 0 Battery Voltage
The battery voltage is read at the BATTISNSN pin on channel 0. The battery voltage is first scaled as V(BATT)/2 to fit the input
range of the ADC.
Table 70. Battery Voltage Reading Coding
Conversion Code
ADRESULTx[9:0]
Voltage at Input ADC in V Voltage at BATTISNSN in V
1 111 111 111
1 000 010 100
0 000 000 000
2.400
1.250
0.000
4.800
2.500
0.000
7.7.3.2
Channel 1 Battery Current (Optional)
Battery current is only valid after a battery voltage reading. The current flowing into and out of the battery can be read via the
ADC by monitoring the voltage drop over the sense resistor between BATTISNSN and BATTISNSP.
The voltage difference between BATTISNSN and BATTISNSP is amplified to fit the ADC input range as V(BATTISNSP -
BATTISNSN)*15. Since battery current can flow in both directions, the conversion is read out in 2’s complement. Positive
readings correspond to the current flowing into the battery, and negative readings to the current flowing out of the battery.
Table 71. Battery Current Reading Coding
Conversion
Code ADRESULTx [9:0]
0 111 111 111
0 000 000 001
0 000 000 000
1 111 111 111
1 000 000 000
Voltage at input
ADC in mV
1200.00
2.346
0
-2.346
-1200.00
BATTISNSN–BATTISNSP in mV
80
0.156
0
-0.156
-80
Current through
20 mOhm in mA
4000
7.813
0
7.813
4000
Current Flow
To battery
To battery
-
From battery
From battery
The value of the sense resistor used determines the accuracy of the result, as well as the available conversion range. Note that
excessively high values can impact the operating life of the device due to extra voltage drop across the sense resistor.
If battery current sense is required, add a 20 m ? resistor between the BATTISNSN and BATTISNSP terminal, as shown in
MC34708
Analog Integrated Circuit Device Data ?
79
Freescale Semiconductor
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