参数资料
| 型号： | 71M6541F-DB |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 126/166页 |
| 文件大小： | 0K |
| 描述： | DEMO BOARD 71M6541F |
| 标准包装： | 1 |
| 系列： | * |
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71M6541D/F/G and 71M6542F/G Data Sheet
5.3
5.3.1
CE Interface Description
CE Program
The CE performs the precision computations necessary to accurately measure energy. These computations
include offset cancellation, phase compensation, product smoothing, product summation, frequency
detection, VAR calculation, sag detection and voltage phase measurement. All data computed by the CE
is dependent on the selected meter equation as given by EQU[2:0] ( I/O RAM 0x2106[7:5] ).
The CE program is supplied by Maxim as a data image that can be merged with the MPU operational
code for meter applications. Typically, the CE program provided with the demonstration code covers most
applications and does not need to be modified. Other variations of CE code are available from Maxim.
The descriptions provided in this section apply to the CE code revisions shown in Table 77 . Contact the
local Maxim representative to obtain the appropriate CE code required for a specific application.
Table 77. Standard CE Codes
5.3.2
Device
71M6541D/F/G
71M6542F/G
CE Data Format
Local Sensors
CE41A01 (Eq. 0 or 1)
CE41A01 (Eq. 0 or 1)
CE41A04 (Eq. 2)
Remote Sensor
CE41B016601
CE41B016201
(Eq. 0, 1 or 2)
All CE words are 4 bytes. Unless specified otherwise, they are in 32-bit two’s complement format
(-1 = 0xFFFFFFFF). Calibration parameters are defined in flash memory (or external EEPROM) and
must be copied to CE data memory by the MPU before enabling the CE. Internal variables are used in
internal CE calculations. Input variables allow the MPU to control the behavior of the CE code. Output
variables are outputs of the CE calculations. The corresponding MPU address for the most significant
byte is given by 0x0000 + 4 x CE_address and by 0x0003 + 4 x CE_address for the least significant byte.
5.3.3
Constants
Constants used in the CE Data Memory tables are:
?
?
?
?
?
?
?
?
Sampling Frequency: F S = 32768 Hz/13 = 2520.62 Hz.
F 0 is the fundamental frequency of the mains phases.
IMAX is the external rms current corresponding to 250 mV pk (176.8 mV rms) at the inputs IA and IB.
IMAX needs to be adjusted if the pre-amplifier is activated for the IAP-IAN inputs. For a 250 μ? shunt
resistor, IMAX becomes 707 A (176.8 mV rms / 250 μ? = 707.2 A rms).
VMAX is the external rms voltage corresponding to 250 mV pk at the VA and VB inputs.
N ACC , the accumulation count for energy measurements is SUM_SAMPS[12:0] (I/O RAM 0x2107[4:0],
0x2108[7:0]) .
The duration of the accumulation interval for energy measurements is SUM_SAMPS[12:0] / F S .
X is a gain constant of the pulse generators. Its value is determined by PULSE_FAST and PULSE_SLOW
(see Table 83 ).
Voltage LSB (for sag threshold) = VMAX * 7.879810 -9 V.
The system constants IMAX and VMAX are used by the MPU to convert internal digital quantities (as
used by the CE) to external, i.e., metering quantities. Their values are determined by the scaling of the
voltage and current sensors used in an actual meter. The LSB values used in this document relate digital
quantities at the CE or MPU interface to external meter input quantities. For example, if a SAG threshold
of 80 V rms is desired at the meter input, the digital value that should be programmed into SAG_THR (CE
RAM 0x24) would be 80 Vrms * SQRT(2)/ SAG_THR LSB , where SAG_THR LSB is the LSB value in the
description of SAG_THR (see Table 84 ).
126
Rev 4
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| 72346-001 | 72346-1-SCA-II REC |
| 72347-001LF | CONN RECEPT SCA2 20POS VERT PCB |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 71M6541F-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 |
| 71M6541F-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 |
| 71M6541FT-IGT/F | 制造商:Maxim Integrated Products 功能描述:1-PHASE SOC, 64KB FLASH, PRES TEMP SENSOR - Rail/Tube |
| 71M6541FT-IGTR/F | 制造商:Maxim Integrated Products 功能描述:1-PHASE SOC, 64KB FLASH, PRES TEMP SENSOR - Tape and Reel |
| 71M6541G | 制造商:未知厂家 制造商全称:未知厂家 功能描述:71M6541D/71M6541F/71M6541G/71M6542F/71M6542G 是 TeridianTM 的第4 代高集成度单相电表SoC |
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