电子工程世界电子工程世界电子工程世界

产品描述

搜索

PCB-RELAY8

器件型号:PCB-RELAY8
器件类别:工具与设备   
厂商名称:BusBoard
下载文档

器件描述

PCBs & Breadboards Octal Relay Brd, PCB UEXT I2C, Mostly T/H

参数
产品属性属性值
Product AttributeAttribute Value
制造商:
Manufacturer:
BusBoard Prototype Systems
产品种类:
Product Category:
PCBs & Breadboards
RoHS:YES
产品:
Product:
Prototyping Boards
类型:
Type:
Multi-Component
Description/Function:Bare PCB to build relay board with 8 DPDT relays for microcontroller project
长度:
Length:
199 mm
宽度:
Width:
160 mm
商标:
Brand:
BusBoard Prototype Systems
工厂包装数量:
Factory Pack Quantity:
1

PCB-RELAY8器件文档内容

PCB-RELAY8

          Octal Relay Output Board for Microcontroller Projects

Part Number: PCB-RELAY8 (unpopulated PCB, no parts)

Features

  A bare PCB to build a relay board with 8 DPDT relays.  Each relay has  up to four 3-pin terminal

    blocks to connect to the relay contacts.

  Can be controlled via an I2C interface or 8 logic lines. UEXT connector used for I2C

    connection.

  Can be used with 5V, 9V or 12V Omron G5V series relays with 2 Amp contacts. The supply

    voltage must match the relay voltage. Separate logic supply required for I2C.

  Bare PCB only (unpopulated, no parts provided). BOM and schematic available for download.

  Mostly thru-hole construction allows for easy assembly (I2C output port is SMT).

Details

The RELAY8 is an output board providing 8 DPDT relays for microcontroller projects.   Each relay has

two switches with NO and NC contacts (Normally Open and Normally Closed).

BusBoard Prototype Systems - Built for designers

www.BusBoard.com  sales@busboard.com          BPS-DAT-(PCB-RELAY8)-0001 Rev 0.10 Datasheet.doc
Removable 5.08mm (0.2 inch) terminal blocks are used to connect circuitry to the relays. Each relay has

two switches, and each switch has two 3-pin terminal blocks that can be installed to provide an easy way

to connect multiple wires to each contact.

The RELAY8 board can be built to be controlled by 8 logic signals or an I2C interface. A 2x8 header is

used to connect to the inputs with a 16-pin ribbon cable for the logic level version. An Olimex style

UEXT 2x5 header is used for the I2C option. UEXT is an open standard developed by Olimex

providing 3 Volt I2C, SPI, and USART expansion on one connector. A 10-pin ribbon cable is used to

connect to dev boards with UEXT connectors.

The power input connector can be a coaxial barrel connector, a 2-pin terminal block, or a 2-pin MTA-

100 connector, or 0.1" spacing header.

This is an unpopulated board and no parts are included. The BOM (bill of materials) and schematic

diagram are available at http://www.busboard.us/products/PCB-RELAY8/ to construct the circuit.

Soldering is required and prior experience with electronic assembly is recommended. A PCB

soldermask helps prevent solder bridges on tracks and a silkscreen legend provides part locations.

Construction

The construction is completely thru-hole for the parallel port version, providing easy assembly,

maintenance, and modification. The I2C version uses a SMT output port IC and a 0805 capacitor                 and

resistors (it’s still easy to solder).

When assembling the board, install the SMT components first (if any). Install the thru-hole components

from shortest to tallest to make it easier to keep the parts inserted when soldering. Hint: Insert the thru-

hole parts of a particular height, place a stiff piece of cardboard over the board, and turn it over using the

cardboard to hold the parts in place. Then you can solder them.

GPIO Parallel Port Option

The parallel port connector uses an 8 bit GPIO port from the microcontroller to control the 8 relays.

The signals are carried on a 16 pin ribbon connector to the 2x8 shrouded connector J29.

The connector has the same pinout as the GPIO headers on BPS development boards and baseboards.

The Vlogic power is separate from the Vrelay power to allow the relays to be driven at a different

voltage, or to provide a higher current supply for the relays. Vlogic and Vrelay can be connected if

needed using jumper JU1.

The GPIO 2x8 connector J29 pinout is as follows:

Signal Function   Pin      Pin             Signal Function

Relay 1           1                     2  +5V

Relay 2           3                     4  +3V3 (not connected)

Relay 3           5                     6  Uncommitted Pin

Relay 4           7                     8  Uncommitted Pin

Relay 5           9        10              Uncommitted Pin

Relay 6           11       12              Uncommitted Pin

Relay 7           13       14              Uncommitted Pin

Relay 8           15       16              Ground

BusBoard Prototype Systems - Built for designers

www.BusBoard.com  sales@busboard.com                        BPS-DAT-(PCB-RELAY8)-0001 Rev 0.10 Datasheet.doc
I2C Driver Option

An I2C driver can be installed to control the relays instead of using 8 GPIO lines. This uses fewer

microcontroller pins. Two connector options are provided, a 4-pin connector J46, or a 2x5 UEXT

header J55.

The I2C driver IC is PCF8574T which is available from NXP and Texas Instruments.

The I2C address can be selected using jumpers JU2, JU3, and JU4.

4-pin I2C Connector J45

J46 provides a 4 pin connection for the I2C interface.

A Tyco MTA-100 type polarized connector is typically used, but the 0.1” pin spacing allows other

connector types to be fitted as well.

The SMT pull-up resistors must be installed on the baseboard or on a peripheral board for the I2C to

function. Typically they are on the microcontroller board, allowing multiple peripheral boards to be

connected. The pull-up resistors R21 and R22 are not fitted in this case

The 4-pin I2C connector signals are as follows:

Pin  Name              Description                      Signal Direction

1    GND               Ground

2    SDA               I2C Data                         Bi-directional

3    SCL               I2C Clock                        Output

4    +5V (or +3.3V)    Power to I2C Driver              Power to Relay8

UEXT Connector J55

The Universal-EXTension-Connector (UEXT) is an expansion connector standard created by Olimex

Ltd. (www.Olimex.com). It provides an asynchronous serial port (USART), SPI and I2C all on the same

connector. Peripheral modules for UEXT are available from Olimex (and stocked at www.Mouser.com)

as well as from other suppliers.

The Relay8 uses only the I2C signals and power and ground to power Vlogic for the Driver IC (pins

1,2,5,6).

The UEXT interface standard uses a 2x5 polarized header with 0.1” spacing. Modules connect to the

UEXT connector with a 10-pin ribbon cable.

The UEXT pinout is as follows:

Direction            Signal Function             Pin    Pin  Signal Function      Direction

Output               +3.3 Volts                  1      2    GND                  -

Output from MCU      USART-TX                    3      4    USART-RX             Input to MCU

Output               I2C-SCL                     5      6    I2C-SDA              Bi-directional

Master In Slave Out  SPI-MISO                    7      8    SPI-MOSI             Master Out Slave In

Master Out Slave In  SPI-SCK                     9      10   SPI-SSN              Master Out Slave In

Most UEXT modules are designed for 3.3V operation only. Therefore, no +5V power option is provided

on most UEXT headers.

BusBoard Prototype Systems - Built for designers

www.BusBoard.com     sales@busboard.com                     BPS-DAT-(PCB-RELAY8)-0001 Rev 0.10 Datasheet.doc
Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory,  Delivery  &  Lifecycle  Information:

BusBoard Prototype Systems:

PCB-RELAY8
小广播

About Us 关于我们 客户服务 联系方式 器件索引 网站地图 最新更新 手机版

站点相关: 大学堂 TI培训 Datasheet 电子工程

北京市海淀区知春路23号集成电路设计园量子银座1305 电话:(010)82350740 邮编:100191

电子工程世界版权所有 京ICP证060456号 京ICP备10001474号 电信业务审批[2006]字第258号函 京公海网安备110108001534 Copyright © 2005-2020 EEWORLD.com.cn, Inc. All rights reserved