参数资料
| 型号： | 71M6521FE-DB |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 70/107页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO FOR 71M6521FE |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | 71M6521 |
| 已供物品： | 2 个板，线缆，CD，电源 |
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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
相关PDF资料 |
PDF描述 |
|---|---|
| 71M6531F-DB | BOARD DEMO 71M6531F |
| 71M6533-DB | BOARD DEMO 71M6533 |
| 71M6534H-DB | BOARD DEMO 71M6534H |
| 71M6541F-DB | DEMO BOARD 71M6541F |
| 71M6543F-DB-CT | DEMO BOARD 71M6543F-DB-CT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 71M6521FE-IGT | 制造商:Maxim Integrated Products 功能描述:Metering Systems on a Chip - SoC Residential Energy Meter IC |
| 71M6521FE-IGT/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 |
| 71M6521FE-IGT/F1 | 功能描述:计量片上系统 - SoC 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 |
| 71M6521FE-IGTR | 制造商:Maxim Integrated Products 功能描述:Metering Systems on a Chip - SoC Residential Energy Meter IC |
| 71M6521FE-IGTR/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 |
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