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参数资料
| 型号： | 71M6521FE-IM/F |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/107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： | 260 |
| 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： | 散装 |
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71M6521DE/DH/FE Data Sheet
Battery Monitor
The battery voltage is measured by the ADC during alternative multiplexer frames if the BME (Battery Measure
Enable) bit in the I/O RAM is set. While BME is set, an on-chip 45k ? load resistor is applied to the battery, and a
scaled fraction of the battery voltage is applied to the ADC input. After each alternative MUX frame, the result of the
ADC conversion is available at CE DRAM address 07. BME is ignored and assumed zero when system power is not
available (V1 < VBIAS). See the Battery Monitor section of the Electrical Specifications for details regarding the ADC
LSB size and the conversion accuracy.
Functional Description
The AFE functions as a data acquisition system, controlled by the MPU. The main signals (IA, VA, IB, VB) are
sampled and the ADC counts obtained are stored in CE DRAM where they can be accessed by the CE and, if
necessary, by the MPU. Alternate multiplexer cycles are initiated less frequently by the MPU to gather access to the
slow temperature and battery signals.
VREF
IA
VA
IB
VB
VBAT
MUX
VBIAS
VBIAS
V3P3A
-
?Σ ADC
CONVERTER
+
ADC_E
FIR
TEMP
MUX
MUX
CTRL
EQU
MUX_ALT
CHOP_E
MUX_DIV
VREF
VREF_CAL
VREF_DIS
CROSS
CK32
FIR_DONE
FIR_START
VREF
4.9MHz
FIR_LEN
Figure 3: AFE Block Diagram
Digital Computation Engine (CE)
The CE, a dedicated 32-bit signal processor, performs the precision computations necessary to accurately measure
energy. The CE calculations and processes include:
?
?
?
?
?
?
?
Multiplication of each current sample with its associated voltage sample to obtain the energy per sample
(when multiplied with the constant sample time).
Frequency-insensitive delay cancellation on all six channels (to compensate for the delay between samples
caused by the multiplexing scheme).
90 ° phase shifter (for VAR calculations).
Pulse generation.
Monitoring of the input signal frequency (for frequency and phase information).
Monitoring of the input signal amplitude (for sag detection).
Scaling of the processed samples based on calibration coefficients.
The CE program resides in flash memory. Common access to flash memory by CE and MPU is controlled by a
memory share circuit. Each CE instruction word is two bytes long. Allocated flash space for the CE program cannot
exceed 1024 words (2KB). The CE program counter begins a pass through the CE code each time multiplexer state 0
begins. The code pass ends when a HALT instruction is executed. For proper operation, the code pass must be
completed before the multiplexer cycle ends (see System Timing Summary in the Functional Description Section).
The CE program must begin on a 1Kbyte boundary of the flash address. The I/O RAM register CE_LCTN[4:0]
defines which 1KB boundary contains the CE code. Thus, the first CE instruction is located at 1024* CE_LCTN[4:0] .
The CE DRAM can be accessed by the FIR filter block, the RTM circuit, the CE, and the MPU. Assigned time slots
are reserved for FIR, RTM, and MPU, respectively, to prevent bus contention for CE DRAM data access. Holding re-
gisters are used to convert 8-bit wide MPU data to/from 32-bit wide CE DRAM data, and wait states are inserted as
needed, depending on the frequency of CKMPU.
Rev 3
Page: 13 of 107
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| 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: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 |
| 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:开发板和工具包 - 8051 71M6521D Demo Brd RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:C8051F960, Si7005 核心: 接口类型:USB 工作电源电压: |
| 71M6523-IM | 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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