参数资料
型号: 71M6521FE-IMR/F
厂商: Maxim Integrated
文件页数: 14/107页
文件大小: 0K
描述: IC ENERGY METER 32K FLASH 68-QFN
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,500
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-VFQFN 裸露焊盘
供应商设备封装: 64-QFN(7.5x7.5)
包装: 带卷 (TR)
71M6521DE/DH/FE Data Sheet
The CE DRAM contains 128 32-bit words. The MPU can read and write the CE DRAM as the primary means of data
communication between the two processors.
Table 2 shows the CE DRAM addresses allocated to analog inputs from the AFE.
ADDRESS (HEX)
00
01
02
03
04
05
06
07
NAME
IA
VA
IB
VB
-
-
TEMP
VBAT
DESCRIPTION
Phase A current
Phase A voltage
Phase B current
Phase B voltage
Not used
Not used
Temperature
Battery Voltage
Table 2: CE DRAM Locations for ADC Results
The CE of the 71M6521DE/DH/FE is aided by support hardware that facilitates implementation of equations, pulse
counters, and accumulators. This support hardware is controlled through I/O RAM locations EQU (equation assist),
DIO_PV and DIO_PW (pulse count assist), and PRE_SAMPS and SUM_CYCLES (accumulation assist). PRE_SAMPS
and SUM_CYCLES support a dual level accumulation scheme where the first accumulator accumulates results from
PRE_SAMPS samples and the second accumulator accumulates up to SUM_CYCLES of the first accumulator results.
The integration time for each energy output is PRE_SAMPS * SUM_CYCLES /2520.6 (with MUX_DIV = 1). CE hardware
issues the XFER_BUSY interrupt when the accumulation is complete.
Meter Equations
Compute Engine (CE) firmware and hardware for residential meter configurations implement the equations listed in
Table 3. The register EQU (located in the I/O RAM) specifies the equation to be used based on the number of phases
used for metering.
Description
EQU
0B
Watt & VAR Formula
Element 0 Element 1
0
1
2
1 element, 2W 1 φ with neutral current sense
and tamper detection (VA connected to VB)
1 element, 3W 1 φ
2 element, 4W 2 φ
VA IA
VA(IA-IB)/2
VA IA
VA IB
N/A
VB IB
Table 3: Meter Equations.
Page: 14 of 107
Rev 3
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