8:1 Serial Port Expander
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1 8:1 Serial Port Expander V 1.3 This is an evolving document check back for updates. Features Expand a single UART (RX / TX) serial port into 8 additional serial ports On-board LEDs indicate which channel has been opened Supports baud rates greater then 1M Baud Easily connect two Serial Port Expanders together to get 16 additional serial ports Operating voltage 3.3V to 5V Power consumption 0.15mA at 3.3 volts Description The Atlas Scientific 8:1 Serial Port Expander, enables the user to easily expand one hardware serial port into 8 serial ports. The on-board LEDs provide the user with a simple way of identifying which one of the 8 serial ports is opened. Atlas-Scientific.com Copyright Atlas Scientific LLC All Rights Reserved 1
2 9 8 TM :1 Serial Port Expander System overview The Atlas Scientific 8:1 Serial Port Expander has been designed to help the embedded systems engineer easily add an expanded number of UART serial ports to a microcontroller that does not have enough ports for its intended application. The microcontrollers UART is connected to the port expander and the serial signal is then routed to one of the new ports. Controlling what port the signal is routed to is done through a simple 3 pin binary switch. This device will use 3 GPIO pins from your microcontroller to operate properly RESET ICSP2 AREF L GND DIGITAL (PWM= ) TX0 RX0 TX RX Arduino ON 1 IOREF RESET 3V3 ICSP 5V POWER GND GND VIN A0 ANALOG IN A1 A2 A3 A4 A5 Expanding an Arduino Uno s single serial port to 8 serial ports. Expanding a Raspberry Pi s single serial port to 8 serial ports. Atlas-Scientific.com Copyright Atlas Scientific LLC All Rights Reserved 2
3 Device operation Max baud rate 1M baud Power 3.3V to 5.0V Power consumption 5V 0.15mA 3.3V } The on board LEDs can not be disabled The Atlas Scientific 8:1 Serial Port Expander is broken up into two sections, a control section and an output section. Control section Output section Atlas-Scientific.com Copyright Atlas Scientific LLC All Rights Reserved 3
4 Output section The output section consists of eight output ports. These ports are marked P1 P8 Each of these eight output ports consist of an RX and TX pin. Each one of these RX/TX pins connects to your peripheral device, like this: This is correct Control section VCC Supply voltage (3.3V to 5V) RX Data in TX Data out S1 Output direction control 1 S2 Output direction control 2 S3 Output direction control 3 EN Enable GND Supply ground Atlas-Scientific.com Copyright Atlas Scientific LLC All Rights Reserved 4
5 VCC and ground VCC can be as high as 5 volts. Keep VCC and GND tied to the main power bus of your system. RX / TX The main RX and TX input pins are connected to the microcontrollers TX and RX pins respectively. S1, S2 and S3 S1 S3 are the control switches (pins) which guide the RX and TX signals to the correct output section. All that is needed to guide the RX/TX signal to 1 of the 8 available ports is to set the S1 S3 pins high or low. The combination of the S1 S3 pin state is not arbitrary. It is the equivalent of binary 0 to binary 7. Atlas Scientific has chosen to name the expanded ports P1 P8 however, they are address by setting S1 S3 using the binary numbers 0 7. Example To open port eight you would set pins S1, S2 and S3 high (binary 7). Atlas-Scientific.com Copyright Atlas Scientific LLC All Rights Reserved 5
6 EN pin If this feature is not being used, you can leave the EN pin floating. In previous versions of the Serial port expander this pin needed to be connected to GND if it was not being used. This is no longer the case. The pin can be left floating if this feature is not being used. The pin marked EN is the enable line. If EN is pulled high (or set to 1 by your microcontroller) the 8:1 Serial Port Expander will not work. At first this may seem unnecessary however, use of the EN pin will allow you to control 16 or more devices with just 1 serial port and two or more 8:1 Serial Port Expanders. Refer to the Arduino UNO + 2 Serial Port Expander code to see how this is done. Atlas-Scientific.com Copyright Atlas Scientific LLC All Rights Reserved 6
7 8:1 Serial Port Expander footprint 2.54 mm (0.1 ) 1. In your CAD software place an 9 position header mm (0.9 ) 31.5 mm (1.24 ) 2. Place two, 12 position headers at both left and right of the 9 position header as shown. 3. Once this is done you can delete the horizontal 9 position header. Make sure that the two, 12 position headers are 20.32mm (0.8 ) apart from each other mm (0.8 ) Atlas-Scientific.com Copyright Atlas Scientific LLC All Rights Reserved 7
8 Atlas-Scientific.com Copyright Atlas Scientific LLC All Rights Reserved 8
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