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參數資料
型號: 71M6521DE-IMR/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: 69/103頁
文件大小: 1691K
代理商: 71M6521DE-IMR/F
71M6521DE/71M6521FE
Energy Meter IC
DATA SHEET
OCTOBER 2010
Page: 68 of 103
2005-2010 Teridian Semiconductor Corporation
v1.1
A Maxim Integrated Products Brand
19-5370; 10/10
Optical Interface
The pins OPT_TX and OPT_RX can be used for a regular serial interface, e.g. by connecting a RS_232 transceiver, or they
can be used to directly operate optical components, e.g. an infrared diode and phototransistor implementing a FLAG interface.
Figure 36 shows the basic connections. The OPT_TX pin becomes active when the I/O RAM register OPT_TXDIS is set to 0.
The polarity of the OPT_TX and OPT_RX pins can be inverted with configuration bits OPT_TXINV and OPT_RXINV, re-
spectively.
The OPT_TX output may be modulated at 38kHz when system power is present. Modulation is not available in BROWNOUT
mode. The OPT_TXMOD bit enables modulation. The duty cycle is controlled by OPT_FDC[1:0], which can select 50%, 25%,
12.5%, and 6.25% duty cycle. A 6.25% duty cycle means OPT_TX is low for 6.25% of the period.
The receive pin (OPT_RX) may need an analog filter when receiving modulated optical signals.
With modulation, an optical emitter can be operated at higher current than nominal, enabling it to increase the distance
along the optical path.
If operation in BROWNOUT mode is desired, the external components should be connected to V3P3D.
OPT_TX
R
2
R
1
OPT_RX
71M6521
V3P3SYS
Phototransistor
LED
100k
Ω
100pF
V3P3SYS
OPT_TX
R
2
R
1
OPT_RX
71M6521
V3P3SYS
Phototransistor
LED
100k
Ω
100pF
V3P3SYS
Figure 36: Connection for Optical Components
Connecting V1 and Reset Pins
A voltage divider should be used to establish that V1 is in a safe range when the meter is in mission mode (V1 must be lower
than 2.9V in all cases in order to keep the hardware watchdog timer enabled). For proper debugging or loading code into the
71M6521DE/FE mounted on a PCB, it is necessary to have a provision like the header shown above R1 in Figure 37. A
shorting jumper on this header pulls V1 up to V3P3 disabling the hardware watchdog timer.
The parallel impedance of R1 and R2 should be approximately 20 to 30k
in order to provide hysteresis for the power fault
monitor.
相關PDF資料
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71M6521FE-IM/F SPECIALTY ANALOG CIRCUIT, QCC68
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71M6532D-IGTR/F 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQFP100
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相關代理商/技術參數
參數描述
71M6521DH 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Energy Meter ICs
71M6521DH-IGT/F 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Energy Meter ICs
71M6521DH-IGTR/F 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Energy Meter ICs
71M6521FE 制造商:TERIDIAN 制造商全稱:TERIDIAN 功能描述:Energy Meter IC
71M6521FE-DB 功能描述:開發板和工具包 - 8051 71M6521FE 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:
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