user's guide to Expand development system capabilities by adding 12bit Digital to Analog Converter 12bit-DAC
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Table of Contents Introduction to 12bit-DAC 4 Key features 4 System Specification 5 1. Connecting with development system 6 2. DIP switch settings 7 3. Connecting 12bit-DAC with analog device 8 4. Jumper settings for reference voltage 9 5. Schematic 10 6.
Introduction to 12bit-DAC Accessory board is designed for usage with various development systems and other MCU device with 2x5 header. 12bit -DAC additional board is designed for Digital to Analog Conversion. To communicate with MCU accessory board use serial SPI interface.
System Specification power supply 3.3V to 5V DC depends on development system in use power consumption max 50mA ( current at supply pins) board dimensions 49.59 x 23.88mm (1.95 x 0.94“) weight ~9g (0.
1. Connecting with development system Figure 1-1: 12bit-DAC connected to development system Figure 1-2: Connecting 12bit-DAC 12bit-DAC is designed for connection with 2x5 male headers on development system port’s via 2x5 female header on accessory board. Every pin on 2x5 female header is marked so for proper orientation just compare marks between accessory board and development system.
2. DIP switch settings In order to connect 12bit-DAC to different development system it is necessary to make settings on DIP switch SW1. Every pin on DIP switch SW1 is connected to different pin of 2x5 female header. In table 1 is given list which switch on DIP switch SW1 should be turned ON for different development system.
3. Connecting 12bit-DAC with analog device Figure 3-1: 12bit-DAC connected with other device via wire GND In order to connect 12bit-DAC accessory board with analog device it is necessary to provide twisted wires or shielded cable which is good choice if cable goes thru electrically noisy environment.
4. Jumper settings for reference voltage Figure 4-1: Ref. voltage is 4.096V Figure 4-2: Ref. voltage is VCC In order to set reference voltage (Vref) it is necessary to place jumper J1 in adequate position. To use reference voltage of 4.096V place jumper J1 to 4.096 position, Figure 4-1. For VCC reference voltage (3.3V or 5V depends on development system in use) place jumper J1 in VCC position, Figure 4-2.
5. Schematic VCC P4 P6 VCC VCC REF1 VIN GND VOUT P1 P3 P5 P7 P3 P5 P6 P3 P4 P6 P7 P1 R1 VCC E1 10uF VCC SW1 Vref 4.
6. Dimensions 23.88mm(0.94'’) 16.36mm(0.64'’) 49.59mm(1.95'’) 7.51mm(0.
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