Serial 10-Bit 4-Channel D/A Converter; Serial 10-Bit, 4-Channel D/A Converter; D/A Header Description - Motorola 56F805 Hardware User Manual

2.14 Serial 10-bit 4-channel D/A Converter

The 56F805EVM board contains a serial 10-bit, 4-channel D/A converter connected to the
56F805's SPI port. The output pins are uncommitted and are connected to a 4X2 header,
J20, to allow easy user connections. Refer to
for the header's pin out. The D/A's output full-scale range value can be set to
Table 2-10
a value from 0.0V to 2.4V by a trimpot. This trimpot is preset to 2.05V, which provides
approximately 2mV per step.
56F805
Figure 2-10. Serial 10-bit, 4-Channel D/A Converter
MOTOROLA
Freescale Semiconductor, Inc.
+3.3V
U18
MOSI DIN
OUT A
MISO DOUT
OUT B
SCLK SCLK
OUT C
OUT D
PB4 CS
RSTO CL
Table 2-10. D/A Header Description
Pin # Signal
1 D/A Channel 0
3 D/A Channel 1
5 D/A Channel 2
7 D/A Channel 3
Technical Summary
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Go to: www.freescale.com
Serial 10-bit 4-channel D/A Converter
for the D/A connections and to
Figure 2-10
+3.3VA
D/A CONNECTOR
J20
1
3
5
7
Vref
+3.3VA
10K
R107
J20
Pin # Signal
2 AGND
4 AGND
6 AGND
8 AGND
2
4
6
8
2-15