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参数资料
| 型号： | 71M6515H-IGTWR/F |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP64 |
| 封装： | LEAD FREE, LQFP-64 |
| 文件页数： | 16/60页 |
| 文件大小： | 826K |
| 代理商： | 71M6515H-IGTWR/F |
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71M6515H
Energy Meter IC
DATA SHEET
JULY 2011
Page: 23 of 60
2005
2011 Teridian Semiconductor Corporation
1.6
A Maxim Integrated Products Brand
Temperature Compensation for Energy Measurements
TEMP_NOM is one of the calibration parameters that must be loaded by the host in order to enable temperature measurement
and thereby temperature compensation.
PPMC and PPMC2, the linear and quadratic compensation coefficients, compensate for temperature drift in the 71M6515H
reference that affects the meter performance. PPMC and PPMC2 describe how the 71M6515H calculations are to respond to
temperature. This means they should be the negative of the meter behavior before compensation. PPMC and PPMC2 are
scaled from PPM/°C and PPM/°C
2 values. See the register description for details. Temperature compensation can be
selected to operate in one of two modes shown in the table below:
Temperature Compensation Mode
DEFAULT_PPM Bit in
CONFIG Register
PPMC, PPMC2 Calculation
Internal (CE)
1
By post-processor, based on
stored VREF characteristics
External (host)
0
By host
When the part is first powered up, TEMP_NOM, PPMC, and PPMC2 are zero. When the host writes its calibration value into
TEMP_NOM (after setting the DEFAULT_PPM bit on the CONFIG register to 1), PPMC and PPMC2 will automatically be
initialized to the values that best compensate for the temperature drift of the internal reference. These parameters will be
individually customized for 71M6515H parts. If, for some reason, the host writes to TEMP_NOM again, PPMC and PPMC2 will
not be changed since they will no longer be zero.
If TEMP_NOM is not loaded by the host, PPMC and PPMC2 are ignored, and their values are permanently held at zero.
If TEMP_NOM is zero, no temperature compensation occurs, even if PPMC and PPMC2 are loaded.
If the host wishes to provide its own compensation, it should read PPMC and PPMC2 and modify them by merging the
additional compensation into to them. In that case, the DEFAULT_PPM bit in the CONFIG register must be zero.
Temperature Compensation for the Crystal and RTC
The crystal oscillator contributes negligible error to energy calculations. However, sometimes specifications for the real time
clock (RTC) require better accuracy than that provided by the untrimmed watch crystal. The 71M6515H therefore allows
calibration of the RTC clock. Calibration requires that frequency tolerance and frequency stability either be obtained from the
manufacturer or be independently measured (the RTC clock is available on the TMUX pin). Calibration does not change the
frequency of the RTC clock, but rather increments or decrements the clock by one second when sufficient error has
accumulated. Positive correction makes the clock run faster.
The formula for the RTC correction factor is as follows:
CORRECTION [PPM] =
T
CALC
Y
T
CALC
Y
CALC
Y
+
+
2
1000
2
_
100
1
_
10
0
_
Where
Y_CALC0 = 10 * crystal frequency deviation from ideal (measured)
Y_CALC1 = 100 * crystal skew (nominally zero)
Y_CALC2 = 1000 * crystal frequency stability (specified)
T = T - Calibration Temperature in °C
Calibration
Calibration Factors for CT and Resistive Shunt
Once installed in a meter, the TERIDIAN 71M6515H IC has to be calibrated for the tolerances of current sensors, voltage
dividers and signal conditioning components. The room temperature reading of its temperature sensor must also be entered.
These calibration factors must be stored by the host and, upon power up, loaded into the TERIDIAN 71M6515H. Typical
calibration constants are listed in Table 4.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 71M6521BE | 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Energy Meter IC |
| 71M6521BE-DB | 制造商:Maxim Integrated Products 功能描述:Development Boards & Kits - 8051 71M6521BE Demo Brd |
| 71M6521BE-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 |
| 71M6521BE-IGT/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 |
| 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 |
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