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MCP48X1DAC(4) NetBSD Kernel Interfaces Manual MCP48X1DAC(4)
Powered by man-cgi (2021-03-02).
Maintained for NetBSD
by Kimmo Suominen.
Based on man-cgi by Panagiotis Christias.
mcp48x1dac -- Microchip 48x1 digital to analog converter
mcp48x1dac* at spi? slave ? flags N
The mcp48x1dac driver supports the MCP48x1 family of digital to analog
converters. The digital values to be converted to analog signal are
passed through the sysctl(8) node.
The driver reports the current voltage output on the chip's DAC channel
through the envsys(4) API. It calculates these values assuming that
internal 2.048V reference voltage (Vref) is used.
The following table shows the supported chips. The type of the chip can
be selected with the flags argument in the config file.
Designation Resolution flags
MCP4801 8 bits 0
MCP4811 10 bits 1
MCP4821 12 bits 2
The following sysctl(3) variables are provided:
Defines digital data to be converted into analog signal. This
value is interpreted literally and sent to the DAC without any
conversion. Refer to the chip datasheet for more information.
When set to 1 it enables 2x output gain on the DAC channel. The
default value is 0.
envsys(4), spi(4), sysctl(8)
MCP4801/4811/4821 8/10/12-Bit Voltage Output Digital-to-Analog Converter
with Internal VREF and SPI Interface Data Sheet.
The mcp48x1dac driver first appeared in NetBSD 7.0.
The mcp48x1dac driver was written by Radoslaw Kujawa.
This man page is based on mcp3kadc(4) page by Frank Wille.
There are bugs.
NetBSD 9.99 August 23, 2015 NetBSD 9.99