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CS5516-AS Datasheet(PDF) 33 Page - Cirrus Logic

Part # CS5516-AS
Description  16BIT/20-BIT BRIDGE TRANSDUCER A/D CONVERTER
PDF  41 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS5516-AS Datasheet(HTML) 33 Page - Cirrus Logic

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A bridge driver, composed of a Siliconix TP0610
transistor and a Micrel MIC4428 dual CMOS
driver, is provided which allows the BX2 output
from the CS5516 or CS5520 to provide either dc
or ac excitation to the bridge.
The digital interface pins of the A/D converter
connect to the microcontroller, or alternatively,
these connections can be cut, or the on-board
microcontroller can be removed, and the user’s
own microcontroller can be interfaced to J1
header connector.
Figure 2 illustrates the Motorola 68HC705C8
microcontroller which reads or writes data into
the A/D converter and communicates with the
PC-compatible computer via the RS-232 inter-
face. The microcontroller derives its 4 MHz
clock from the A/D converter clock. The micro-
controller is configured to communicate over the
RS-232 link at 4800 baud, no parity, 8-bit data,
and 1 stop bit. A Motorola MC145407 RS-232
interface chip is used to send and recieve data to
the PC-compatible computer via the 25-pin Sub-
D connector.
Table 1 lists the commands sent to the microcon-
troller to write to or to read from the registers in
the A/D converter.
If software other than that
provided with the evaluation board is used, the
format of the data transmitted over the RS232
line is as follow:
Write commands are com-
Vpp
OSC2
OSC1
PA1
PD2
PD4
PD7
PA0
PA2
VDD
PB7
19
PB6
18
PB5
17
PB4
16
PB3
15
PB2
14
PB1
13
PB0
12
38
39
10
31
32
33
36
11
9
PD3
+
47
µF
0.1
µF
RESET
IRQ
PD0
PD1
PC7 21
PC6 22
PC5 23
PC4 24
PC3 25
PC2 26
PC1 27
PC0 28
PA7
4
PA6
5
PA5
6
PA4
7
PA3
8
TCAP
37
TCMP
35
PD5
34
2
29
30
RESET
10k
1
µF
1
+5VD
10k
3
470
Vss
20
40
68HC705C8
10k
U2
C24
470
R20
C23
C22
D1
SMODE
SOD
SCLK
DRDY
OSCLK
SID
CS
RST
From
Figure 1
470
D2
+5VD
RI
TXD
RXD
RTS
CTS
DTR
DSR
DCD
22
2
3
4
5
20
6
8
7
10k
10
µF
18
20
5
6
7
8
9
10
11
12
13
14
15
16
1
3
19
17
10
µF
+
+
+
Vcc
C2+
VDD
C2-
+5VD
GND
Vss
2
4
C1+
C1-
Sub-D
25 Pin
C28
C27
R28
U4
MC145407
10
µF
C25
10
µF
C26
RXD
TXD
Figure 2. Microcontroller and RS-232 Interface
CDB5516/CDB5520
DS74DB3
33
DS74DB4
33



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