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2.10 Serial 10-bit 4-channel D/A Converter (Optional)
The 56F8323EVM board contains the provions for a user to provide a serial 10-bit,
4-channel D/A converter connected to the 56F8323's SPI #0 port. The output pins are
uncommitted and are connected to a 4x2 header, J4, to allow easy user connections. Refer
to
for the D/A connections and
Figure 2-8
output full-scale range value can be set to a value from +0.0V to +2.4V by a trimpot, R48.
If this trimpot is preset to +2.05V, it would provide approximately +2mV per step. If
another device must be used with SPI #0's MISO signal and with the D/A converter on the
board, the daisy chain jumper, JG9, can be used to extend or isolate the serial chain.
56F8323
MOSI0
MISO0
SCLK0
Figure 2-8. Serial 10-bit, 4-Channel D/A Converter
MOTOROLA
Freescale Semiconductor, Inc.
MAX5251
DIN
JG9
2
1
DOUT
SCLK
SS0
CS
RSTO
CL
Table 2-11. 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
For More Information On This Product,
Go to: www.freescale.com
Serial 10-bit 4-channel D/A Converter (Optional)
for the header's pin-out. The D/A's
Table 2-11
D/A 0
D/A 1
D/A 2
D/A 3
V
REF
+3.3VA
J4
Pin #
Signal
2
AGND
4
AGND
6
AGND
8
AGND
D/A Connector
1
2
3
4
5
6
7
8
R48
2-17
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