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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： | 12/103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: 16 of 103
2005-2010 Teridian Semiconductor Corporation
v1.1
A Maxim Integrated Products Brand
19-5370; 10/10
VA
IA
1/32768Hz =
30.518s
13/32768Hz = 397s
per mux cycle
IB
VB
Figure 4: Samples from Multiplexer Cycle
The end of each multiplexer cycle is signaled to the MPU by the CE_BUSY interrupt. At the end of each multiplexer cycle,
status information, such as sag data and the digitized input signal, is available to the MPU.
XFER_BUSY
Interrupt to MPU
20ms
833ms
Figure 5: Accumulation Interval
Figure 5 shows the accumulation interval resulting from PRE_SAMPS = 42 and SUM_CYCLES = 50, consisting of 2100 samples
of 397s each, followed by the XFER_BUSY interrupt. The sampling in this example is applied to a 50Hz signal.
There is no correlation between the line signal frequency and the choice of PRE_SAMPS or SUM_CYCLES (even though when
SUM_CYCLES = 42 one set of SUM_CYCLES happens to sample a period of 16.6ms). Furthermore, sampling does not have to
start when the line voltage crosses the zero line, and the length of the accumulation interval need not be an integer multiple of
the signal cycles.
It is important to note that the length of the accumulation interval, as determined by NACC, the product of SUM_CYCLES and
PRE_SAMPS, is not an exact multiple of 1000ms. For example, if SUM_CYCLES = 60, and PRE_SAMPS = 00 (42), the
resulting accumulation interval is:
ms
Hz
f
N
S
ACC
75
.
999
62
.
2520
13
32768
42
60
=
=
τ
This means that accurate time measurements should be based on the RTC, not the accumulation interval.
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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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