参数资料
型号: 71M6521DE-IGT/F
厂商: Maxim Integrated
文件页数: 70/107页
文件大小: 0K
描述: IC ENERGY METER 16K FLASH 64LQFP
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 160
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-LQFP
供应商设备封装: 64-LQFP(10x10)
包装: 管件
71M6521DE/DH/FE Data Sheet
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 38 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 ,
respectively.
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.
V3P3SYS
71M6521
OPT_RX
100pF 100k Ω
R 1
Phototransistor
V3P3SYS
OPT_TX
R 2
LED
Figure 38: 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/DH/FE mounted on a PCB, it is necessary to have a provision like the header
shown above R1 in Figure 39. 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.
V3P3
R 1
R 3
GND
R 2
5k Ω
C 1
100pF
V1
Figure 39: Voltage Divider for V1
Page: 70 of 107
Rev 3
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