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Command: mcp48x1dac | Section: 4 | Source: NetBSD | File: mcp48x1dac.4
MCP48X1DAC(4) FreeBSD Kernel Interfaces Manual MCP48X1DAC(4)
NAME
mcp48x1dac - Microchip 48x1 digital to analog converter
SYNOPSIS
mcp48x1dac* at spi? slave ? flags N
DESCRIPTION
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
SYSCTL VARIABLES
The following sysctl(3) variables are provided:
machdep.mcp48x1dac0.data
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.
machdep.mcp48x1dac0.gain
When set to 1 it enables 2x output gain on the DAC channel. The
default value is 0.
SEE ALSO
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.
HISTORY
The mcp48x1dac driver first appeared in NetBSD 7.0.
AUTHORS
The mcp48x1dac driver was written by Radoslaw Kujawa.
This man page is based on mcp3kadc(4) page by Frank Wille.
BUGS
There are bugs.
FreeBSD 14.1-RELEASE-p8 August 23, 2015 FreeBSD 14.1-RELEASE-p8