DAC8562
REV. A
–14–
Decoding Multiple DAC8562s
The CE function of the DAC8562 can be used in applications
to decode a number of DACs. In this application, all DACs re-
ceive the same input data; however, only one of the DACs’ CE
input is asserted to transfer its parallel input register contents
into the DAC. In this circuit, shown in Figure 40, the CE tim-
ing is generated by a 74HC139 decoder and should follow the
DAC8562’s standard timing requirements. To prevent timing
errors, the 74HC139 should not be activated by its ENABLE
input while the coded address inputs are changing. A simple
timing circuit, R1 and C1, connected to the DACs’ CLR pins
resets all DAC outputs to zero during power-up.
MICROPROCESSOR INTERFACING
DAC-8562–MC68HC11 INTERFACE
The circuit illustrated in Figure 41 shows a parallel interface be-
tween the DAC8562 and a popular 8-bit microcontroller, the
M68HC11, which is configured in a single-chip operating
mode. The interface circuit consists of a pair of 74ACT11373
transparent latches and an inverter. The data is loaded into the
latches in two 8-bit bytes; the first byte contains the four most
significant bits, and the lower 8 bits are in the second byte. Data
is taken from the microcontroller’s port B output lines, and
three interface control lines, CLR, CE, and MSB/LSB, are con-
trolled by the M68HC11's PC2, PC1, and PC0 output lines, re-
spectively. To transfer data into the DAC, PC0 is set, enabling
U1’s outputs. The first data byte is loaded into U1 where the
four least significant bits of the byte are connected to
MSB–DB8. PC0 is then cleared; this latches U1’s inputs and
enables U2’s outputs. U2s outputs now become DB7–DB0.
The DAC output is updated with the contents of U1 and U2
when PC1 is cleared. The DAC’s CLR input, controlled by the
M68HC11’s PC2 output line, provides an asynchronous clear
function that sets the DAC’s output to zero. Included in this sec-
tion is the source code for operating the DAC-8562–M68HC11
interface.
VCC
1G
1A
1B
2G
2A
2B
GND
1Y0
1Y1
1Y2
1Y3
2Y0
2Y1
2Y2
2Y3
12
1k
+5V
16
1
2
3
15
14
13
8
11
10
9
7
6
5
4
NC
0.1F
+5V
ENABLE
CODED
ADDRESS
+5V
C1
0.1F
R1
1k
15
DAC-8562
#4
13
16
15
16 DAC-8562
#1
13
15
DAC-8562
#2
13
15
DAC-8562
#3
13
16
VOUT1
VOUT3
VOUT4
VOUT2
DATA
74HC139
Figure 40. Decoding Multiple DAC8562s Using the CE Pin
13
23
22
21
20
1
16
15
14
24
1
2
3
4
9
10
11
12
U1
C
1D
2D
3D
4D
5D
6D
7D
8D
OC
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
13
23
22
21
20
1
16
15
14
24
1
2
3
4
9
10
11
12
U2
C
1D
2D
3D
4D
5D
6D
7D
8D
OC
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
CLR
CE
MSB/ LSB
15
16
9
8
7
6
5
4
3
2
U3
CLR
CE
MSB
DB10
DB9
DB8
DB7
DB6
DB5
DB4
1
19
18
17
DB3
DB2
DB1
LSB
NC
PC2
PC1
74ACT11373
*DAC-8562
74ACT11373
VOUT
74HC04
*M6BHC11
PC2
PC1
PC0
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
*ADDITIONAL PINS OMITTED FOR CLARITY
1
2
13
Figure 41. DAC8562 to MC68HC11 Interface
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