参数资料
| 型号： | 78M6613-SP-1 |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/33页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT 78M6613-SP-1 |
| 标准包装： | 1 |
| 系列： | * |
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DS_6613_018
78M6613 Data Sheet
3.2
Temperature Measurement
Measurement of absolute temperature uses the on-chip temperature sensor while applying the following
formula:
T =
( N ( T ) ? N n )
S n
+ T n
In the above formula, T is the temperature in °C, N(T) is the ADC count at temperature T, N n is the ADC
count at 25°C, S n is the sensitivity in LSB/°C and T n is +25°C.
Example: At 25°C a temperature sensor value of 518,203,584 (N n ) is read by the ADC by a 78M6613 in
the 32-pin QFN package. At an unknown temperature T the value 449,648,000 is read at (N(T)). The
absolute temperature is then determined by dividing both N n and N(T) by 512 to account for the 9-bit
shift of the ADC value and then inserting the results into the above formula, using –2220 for LSB/°C:
T =
449,648,00 0 - 518,203,58 4
512 ? ( ? 2220 )
+ 25 C = 85 . 3 ° C
3.3
Temperature Compensation
behavior (in μ V/°C and μ V/°C , respectively).
(1.195V) has to be taken into account when transitioning to PPM/°C and PPM/°C . This means
Temperature Coefficients: The internal voltage reference is calibrated during device manufacture.
The temperature coefficients TC1 and TC2 are given as constants that represent typical component
2
Since TC1 and TC2 are given in μ V/°C and μ V/°C 2 , respectively, the value of the VREF voltage
2
that PPMC = 26.84*TC1/1.195, and PPMC2 = 1374*TC2/1.195).
Temperature Compensation : The CE provides the bandgap temperature to the MPU, which then may
digitally compensate the power outputs for the temperature dependence of VREF.
The MPU, not the CE, is entirely in charge of providing temperature compensation. The MPU applies
the following formula to determine any gain adjustments . In this formula TEMP_X is the deviation from
nominal or calibration temperature expressed in multiples of 0.1°C:
TEMP _ X ? PPMC TEMP _ X 2 ? PPMC 2
GAIN _ ADJ = 16385 +
2 14 2 23
+
In a power and energy measurement unit, the 78M6613 is not the only component contributing to
temperature dependency. A whole range of components (e.g. current transformers, resistor
dividers, power sources, filter capacitors) will contribute temperature effects. Since the output of
the on-chip temperature sensor is accessible to the MPU, temperature-compensation
mechanisms with great flexibility are possible (e.g. system-wide temperature correction over the
entire unit rather than local to the chip).
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相关代理商/技术参数 |
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| 78M6618 | 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Octal Power and Energy Measurement IC |
| 78M6618-IM | 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Octal Power and Energy Measurement IC |
| 78M6618-IM/F | 功能描述:计量片上系统 - SoC 8 Out Sgl Phase Pwr & Energy Msrmt IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel |
| 78M6618-IM/F/P | 制造商:Maxim Integrated Products 功能描述:PROGRAMMED - LEAD FREE - Rail/Tube |
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