Difference between revisions of "I2C DAC"
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+ | = General info = | ||
Based on the MCP4726 chip from Microchip.<br> | Based on the MCP4726 chip from Microchip.<br> | ||
http://ww1.microchip.com/downloads/en/DeviceDoc/22272C.pdf <br> | http://ww1.microchip.com/downloads/en/DeviceDoc/22272C.pdf <br> | ||
Line 5: | Line 6: | ||
1100 000 and 1100 001 '''OR'''<br> | 1100 000 and 1100 001 '''OR'''<br> | ||
1100 010 and 1100 011<br> | 1100 010 and 1100 011<br> | ||
− | + | You can order both versions. The addresses of your board can be found on the bottom side. | |
+ | |||
+ | = Physical dimensions = | ||
+ | * Board outline: 25x25mm | ||
+ | * Mounting hole diameter: 3mm | ||
+ | * Mounting hole pitch: 19x19mm (3mm from board edge) | ||
+ | |||
+ | = Using the board = | ||
Set a voltage: | Set a voltage: | ||
sudo i2cset -y 1 0x60 0x40 0xff 0xf0 i | sudo i2cset -y 1 0x60 0x40 0xff 0xf0 i | ||
Line 13: | Line 21: | ||
-y don't ask confirmation | -y don't ask confirmation | ||
1 number of the I2C bus (0 on older raspberry pi's) | 1 number of the I2C bus (0 on older raspberry pi's) | ||
− | 0x60 address of the DAC, use 0x61 for the other DAC. | + | 0x60 address of the DAC, use 0x61 (or 0x62 and 0x63) for the other DAC. |
0x40 configuration: normal. | 0x40 configuration: normal. | ||
0xff high 8 bits of the value | 0xff high 8 bits of the value | ||
0xf0 lower four bits of the value (in the high nibble) | 0xf0 lower four bits of the value (in the high nibble) |
Latest revision as of 13:08, 11 November 2015
General info
Based on the MCP4726 chip from Microchip.
http://ww1.microchip.com/downloads/en/DeviceDoc/22272C.pdf
I2C address:
1100 000 and 1100 001 OR
1100 010 and 1100 011
You can order both versions. The addresses of your board can be found on the bottom side.
Physical dimensions
- Board outline: 25x25mm
- Mounting hole diameter: 3mm
- Mounting hole pitch: 19x19mm (3mm from board edge)
Using the board
Set a voltage:
sudo i2cset -y 1 0x60 0x40 0xff 0xf0 i ^^ ^ < Voltage bits
explanation of the arguments:
-y don't ask confirmation 1 number of the I2C bus (0 on older raspberry pi's) 0x60 address of the DAC, use 0x61 (or 0x62 and 0x63) for the other DAC. 0x40 configuration: normal. 0xff high 8 bits of the value 0xf0 lower four bits of the value (in the high nibble)