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参数资料
| 型号： | 71M6521BE-IGT/F |
| 厂商： | Maxim Integrated |
| 文件页数： | 59/97页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METER 8K FLASH 64-LQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 160 |
| 系列： | Single Converter Technology® |
| 测量误差： | 0.4% |
| 电源电压： | 3 V ~ 3.6 V |
| 测量仪表类型： | 单相，双相 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 64-LQFP |
| 供应商设备封装： | 64-LQFP（10x10） |
| 包装： | 托盘 |
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71M6521BE
Energy Meter IC
DATA SHEET
JANUARY 2008
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 as stated in the Electrical Specifications, 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. 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 =
449.648.000 - 518,203,584
512 ? ( ? 2220 )
+ 25 C = 85 . 3 ° C
It is recommended to base temperature measurements on TEMP_RAW_X which is the sum of two consecutive temperature
readings thus being higher by a factor of two than the raw sensor readings.
Temperature Compensation
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 behavior (in μV/°C and
μV/°C 2 , respectively).
Since TC1 and TC2 are given in μV/°C and μV/°C 2 , respectively, the value of the VREF voltage (1.195V) has to be
taken into account when transitioning to PPM/°C and PPM/°C 2 . This means 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, using the CE register GAIN_ADJ . Since the band gap amplifier is
chopper-stabilized via the CHOP_EN bits, the most significant long-term drift mechanism in the voltage reference is removed.
The MPU, not the CE, is entirely in charge of providing temperature compensation. The MPU applies the following formula to
determine GAIN_ADJ (address 0x12) . In this formula TEMP_X is the deviation from nominal or calibration temperature
expressed in multiples of 0.1°C:
GAIN _ ADJ = 16385 +
TEMP _ X ? PPMC
2 14
+
TEMP _ X 2 ? PPMC 2
2 23
In a production electricity meter, the 71M6521BE 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. MPU access to GAIN_ADJ permits a system-wide temperature correction over the
entire meter rather than local to the chip.
V1.0
? 2005-2008 TERIDIAN Semiconductor Corporation
Page: 59 of 97
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 71M6521BE-IGTR/F | 功能描述:计量片上系统 - SoC Residential Energy Meter 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 |
| 71M6521BE-IGTR/F1 | 功能描述:计量片上系统 - SoC 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 |
| 71M6521DE | 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Energy Meter IC |
| 71M6521DE-DB | 制造商:Maxim Integrated Products 功能描述:Development Boards & Kits - 8051 71M6521DE Demo Brd |
| 71M6521DE-IGT/F | 功能描述:计量片上系统 - SoC Residential Energy Meter 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 |
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