参数资料
型号: ADM1276-3ACPZ-RL
厂商: Analog Devices Inc
文件页数: 32/48页
文件大小: 0K
描述: IC HOT SWAP CTLR PMBUS 20LFCSP
标准包装: 5,000
类型: 热交换控制器
应用: 通用
内部开关:
电流限制: 可调
电源电压: 2.95 V ~ 20 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 20-WQFN 裸露焊盘,CSP
供应商设备封装: 20-LFCSP-WQ(5x5)
包装: 带卷 (TR)
ADM1276
VOLTAGE AND CURRENT CONVERSION USING
LSB VALUES
The direct format voltage and current values returned by the
READ_VIN, READ_VOUT, and READ_IOUT commands, and
the corresponding peak versions, are the data output directly by
the ADM1276 ADC. Because the voltages and currents are 12-bit
ADC output codes, they can also be converted to real-world values
when there is knowledge of the size of the LSB on the ADC.
The m, b, and R coefficients defined for the PMBus conversion
are required to be whole integers by the standard and have,
therefore, been rounded slightly. Using this alternative method,
with the exact LSB values, can provide somewhat more accurate
numerical conversions.
To convert an ADC code to current in amperes, the following
formulas can be used:
V SENSE = LSB 25 mV × ( I ADC ? 2048)
I OUT = V SENSE /( R SENSE × 0.001)
where:
V SENSE = (V SENSE+ ) ? (V SENSE? ).
LSB 25 mV = 12.4 μV.
I ADC is the 12-bit ADC code.
I OUT is the measured current value in amperes.
R SENSE is the value of the sense resistor in milliohms.
To convert an ADC code to a voltage, the following formula can
be used:
V M = LSB xV × ( V ADC + 0.5)
Data Sheet
where:
V M is the measured value in volts.
V ADC is the 12-bit ADC code.
LSB xV values are based on the voltage range (see Table 8).
Table 8. Voltage Ranges and LSB Values
Voltage Range, LSB xV LSB Magnitude
0 V to 6 V 1.488 mV
0 V to 20 V 5.208 mV
To convert a current in amperes to a 12-bit value, the following
formula can be used (round the result to the nearest integer):
V SENSE = I A × R SENSE × 0.001
I CODE = 2048 + ( V SENSE / LSB 25 mV )
where:
V SENSE = (V SENSE+ ) ? (V SENSE? ).
I A is the current value in amperes.
R SENSE is the value of the sense resistor in milliohms.
I CODE is the 12-bit ADC code.
LSB 25 mV = 12.4 μV.
To convert a voltage to a 12-bit value, the following formula can
be used (round the result to the nearest integer):
V CODE = ( V A / LSB xV ) ? 0.5
where:
V CODE is the 12-bit ADC code.
V A is the voltage value in volts.
LSB xV values are based on the voltage range (see Table 8).
Rev. C | Page 32 of 48
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