MCP3204/3208 Module¶
This module contains the driver for Microchip MCP3204/3208 analog to digital converter with SPI serial interface (datasheet).
Example:
from microchip.mcp3208 import MCP3208
...
mcp = mcp3208.MCP3208(SPI0, D17)
value_0 = mcp.get_raw_data(True, 0)
value_1 = mcp.get_raw_data(False, 2)
MCP3208 class¶
-
class
MCP3208(spidrv, cs, clk = 400000)¶ Creates an instance of the MCP3208 class. This class allows the control of both MCP3204 and MCP3208 devices.
Parameters: - spidrv – SPI Bus used ‘(SPI0, ...)’
- cs – Chip select pin
- clk – Clock speed, default 400 kHz
-
get_raw_data(single, channel)¶ Return the conversion result as an integer between 0 and 4095 (12 bit).
Input mode and channel are selected by single and channel parameters according to the following table.
single channel Input Configuration Channel Selection True 0 single-ended CH0 True 1 single-ended CH1 True 2 single-ended CH2 True 3 single-ended CH3 True 4* single-ended CH4 True 5* single-ended CH5 True 6* single-ended CH6 True 7* single-ended CH7 False 0 differential CH0 = IN+ CH1 = IN- False 1 differential CH0 = IN- CH1 = IN+ False 2 differential CH2 = IN+ CH3 = IN- False 3 differential CH2 = IN- CH3 = IN+ False 4* differential CH4 = IN+ CH5 = IN- False 5* differential CH4 = IN- CH5 = IN+ False 6* differential CH6 = IN+ CH7 = IN- False 7* differential CH6 = IN- CH7 = IN+ Note
channel values marked with * are available for the MCP3208 only.
The digital output code is determined by the reference voltage Vref and the analog input voltage Vin:
Digital output code = 4096 * Vin / Vref