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參數資料
| 型號： | 71M6521FE-IM/F |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, QCC68 |
| 封裝： | LEAD FREE, LQFN-68 |
| 文件頁數： | 83/103頁 |
| 文件大小： | 1691K |
| 代理商： | 71M6521FE-IM/F |
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71M6521DE/71M6521FE
Energy Meter IC
DATA SHEET
OCTOBER 2010
Page: 80 of 103
2005-2010 Teridian Semiconductor Corporation
v1.1
A Maxim Integrated Products Brand
19-5370; 10/10
CE Interface Description
CE Program
The CE program is supplied by Teridian as a data image that can be merged with the MPU operational code for meter
applications. Typically, the CE program covers most applications and does not need to be modified. For EQU = 0 and EQU =
1, CE code CE21A04_2 should be used. For EQU = 2, CE code image CE21A03_2 should be used. The description in this
section applies to CE code revision CE21A03_2.
Formats
All CE words are 4 bytes. Unless specified otherwise, they are in 32-bit two’s complement (-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 0x1000 + 4 x CE_address and 0x1003 + 4 x CE_address for the least significant byte.
Constants
Constants used in the CE Data Memory tables are:
FS = 32768Hz/13 = 2520.62Hz.
F0 is the fundamental frequency.
IMAX is the external rms current corresponding to 250mV pk at the inputs IA and IB.
VMAX is the external rms voltage corresponding to 250mV pk at the VA and VB inputs.
NACC, the accumulation count for energy measurements is PRE_SAMPS*SUM_CYCLES.
Accumulation count time for energy measurements is PRE_SAMPS*SUM_CYCLES/FS.
The system constants IMAX and VMAX are used by the MPU to convert internal quantities (as used by the CE) to external, i.e.
metering quantities. Their values are determined by the off-chip 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 80V peak is desired at the meter input, the digital value that should be pro-
grammed into SAG_THR would be 80V/SAG_THRLSB, where SAG_THRLSB is the LSB value in the description of SAG_THR.
The parameters EQU, CE_E, PRE_SAMPS, and SUM_CYCLES essential to the function of the CE are stored in I/O RAM (see I/O
RAM section).
Environment
Before starting the CE using the CE_E bit, the MPU has to establish the proper environment for the CE by implementing the
following steps:
Load the CE data into CE DRAM.
Establish the equation to be applied in EQU.
Establish the accumulation period and number of samples in PRE_SAMPS and SUM_CYCLES.
Establish the number of cycles per ADC mux frame.
Set PLS_INTERVAL[7:0] to 81.
Set FIR_LEN to 1 and MUX_DIV to 1.
There must be thirteen 32768Hz cycles per ADC mux frame (see System Timing Diagram, Figure 16). This means that the
product of the number of cycles per frame and the number of conversions per frame must be 12 (allowing for one settling
cycle). The required configuration is FIR_LEN = 1 (three cycles per conversion) and MUX_DIV = 1 (4 conversions per mux
frame).
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 71M6521FE-IMR | 制造商:Maxim Integrated Products 功能描述:Metering Systems on a Chip - SoC Residential Energy Meter IC |
| 71M6521FE-IMR/F | 功能描述:計量片上系統 - SoC Residential Energy Meter IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 處理器系列:71M6511 類型:Metering SoC 最大時鐘頻率:70 Hz 程序存儲器大小:64 KB 數據 RAM 大小:7 KB 接口類型:UART 可編程輸入/輸出端數量:12 片上 ADC: 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-64 封裝:Reel |
| 71M6521-TGP1-68M | 制造商:Maxim Integrated Products 功能描述:Programmer Accessories Gang Programmer Base w/6521 Socket Brd |
| 71M6523-DB | 功能描述:開發板和工具包 - 8051 71M6521D Demo Brd RoHS:否 制造商:Silicon Labs 產品:Development Kits 工具用于評估:C8051F960, Si7005 核心: 接口類型:USB 工作電源電壓: |
| 71M6523-IM | 功能描述:計量片上系統 - SoC Residential Energy Meter IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 處理器系列:71M6511 類型:Metering SoC 最大時鐘頻率:70 Hz 程序存儲器大小:64 KB 數據 RAM 大小:7 KB 接口類型:UART 可編程輸入/輸出端數量:12 片上 ADC: 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-64 封裝:Reel |
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