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| 型号： | 71M6543F-DB-CT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 44/91页 |
| 文件大小： | 0K |
| 描述： | DEMO BOARD 71M6543F-DB-CT |
| 标准包装： | 1 |
| 系列： | * |
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71M6543 Demo Board User’s Manual
3)
4)
The reference voltage of the 71M6543F IC. At the temperature extremes, this voltage can deviate by a
few mV from the room temperature voltage and can therefore contribute to some temperature-related
error, both for the current measurement (pins IAP and IAN) of the neutral current sensor (if used) and
for the voltage measurement (pin VA). As with the Remote Sensor Interface IC, the TC of the
71M6543F reference voltage has both linear and quadratic components. The reference voltage of the
71M6543F over temperature is predictable within ±40 PPM/°C, which means that compensation of the
current and voltage reading is possible to within ±0.24%.
The 71M6543H has more predictable temperature coefficients that allow compensation to within ±10
PPM/°C, resulting in ±0.06% inaccuracy.
The temperature coefficients of the reference voltage are published in the 71M6543F/H data sheet.
The Demo Code will automatically generate the compensation coefficients based on TC 1 and TC 2 us-
ing the fuse values in each device.
The voltage divider network (resistor ladder) on the Demo Board will also have a TC. Ideally, all resis-
tors of this network are of the same type so that temperature deviations are balanced out. However,
even in the best circumstances, there will be a residual TC from these components.
Table 2-1: Temperature-Related Error Sources
Measured Item
Energy Reading
for phase A
Energy Reading
for phase B
Energy Reading
for phase C
Neutral Current
Reading
Error Sources for Current
VREF of 71M6xx3 for phase A
Shunt resistor for phase A
VREF of 71M6xx3 for phase B
Shunt resistor for phase B
VREF of 71M6xx3 for phase C
Shunt resistor for phase C
71M6543 VREF
Sensor for neutral current
Error Sources for Voltage
71M6543 VREF
Voltage divider for VA
71M6543 VREF
Voltage divider for VB
71M6543 VREF
Voltage divider for VC
--
--
Pins on 71M6543
VA, ADC2/ADC3
(IBP/IBN)
VB, ADC4/ADC5)
ICP/ICN
VC, ADC6/ADC7
(IDP/IDN)
ADC0/ADC1
(IAP/IAN)
When can summarize the thermal errors per phase n in the following equation:
P n = V n ? I n ? ( 1 + C VD ) ? ( 1 + C 4 X ) ? ( 1 + C Sn ) ? ( 1 + C 6 X )
The terms used in the above equation are defined as follows:
?
?
?
?
?
?
Vn = voltage applied to the meter in phase n
In = current applied to the shunt in phase n
C VD = error contribution from the voltage divider
C 4X = error contribution from the voltage reference of the 71M6543
C Sn = error from the shunt resistor that is connected via the Remote Interface IC
C 6X = error contribution from the voltage reference of the Remote Interface IC
2.3.2 SOFTWARE FEATURES FOR TEMPERATURE COMPENSATION
In the default settings for the Demo Code, the CECONFIG register has its EXT_TEMP bit (bit 22) set, which
means that temperature compensation is performed by the MPU by controlling the GAIN_ADJ0 through
GAIN_ADJ, registers of the CE. Generally, these four (and when using neutral current measurement, five) reg-
isters are used as follows:
?
?
?
?
?
GAIN_ADJ0 for VA, VB, VC – CE RAM 0x40
GAIN_ADJ1 – Current, phase A (via 71M6xx3) – CE RAM 0x41
GAIN_ADJ2 - Current, phase B (via 71M6xx3) – CE RAM 0x42
GAIN_ADJ3 - Current, phase C (via 71M6xx3) – CE RAM 0x43
GAIN_ADJ4 – Current from neutral current sensor (via 71M6543) – CE RAM 0x44
In general, the GAIN_ADJn registers offer a way of controlling the magnitude of the voltage and current signals
in the data flow of the CE code. A value of 16385 means that no adjustment is performed (unity gain), which
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相关代理商/技术参数 |
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| 71M6543F-IGT/F | 功能描述:计量片上系统 - SoC Precision 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 |
| 71M6543F-IGTR/F | 功能描述:计量片上系统 - SoC Precision 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 |
| 71M6543FT-IGT/F | 制造商:Maxim Integrated Products 功能描述:ENERGY METER ICS - Rail/Tube |
| 71M6543FT-IGTR/F | 制造商:Maxim Integrated Products 功能描述:3-PHASE SOC, 64KB FLASH, PRES TEMP SENSOR - Tape and Reel |
| 71M6543G | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation |
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