Datasheet

ADS1212, 1213
31
SBAS064A
FIGURE 28. Three-Wire Interface with a 8xC32 Microprocessor.
FIGURE 29. Three-Wire Interface with a 8xC51 Microprocessor.
Three-Wire Interface
Figure 28 shows a three-wire interface with a 8xC32 micro-
processor. Note that the Slave Mode is selected and the
SDIO pin is being used for input and output.
Figure 29 shows a different type of three-wire interface with
an 8xC51 microprocessor. Here, the Master Mode is used.
The interface signals consist of SDOUT, SDIO, and SCLK.
ADS1212
A
IN
P
A
IN
N
AGND
V
BIAS
CS
DSYNC
X
IN
X
OUT
DGND
REF
IN
REF
OUT
AV
DD
MODE
DRDY
SDOUT
SDIO
SCLK
DV
DD
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
RESET
RXD
TXD
INT0
INT1
T0
T1
WR
RD
X2
X1
V
SS
8xC32
C
2
27pF
C
1
27pF
R
1
10kΩ
DV
DD
AGND
DGND
DGND
AV
DD
DV
DD
D
CLK
Q
Q
D
CLK
Q
Q
1/2 74HC74 1/2 74HC74
XTAL
AGND
1.0µF
ADS1212
A
IN
P
A
IN
N
AGND
V
BIAS
CS
DSYNC
X
IN
X
OUT
DGND
REF
IN
REF
OUT
AV
DD
MODE
DRDY
SDOUT
SDIO
SCLK
DV
DD
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
V
CC
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
8xC51
C
1
6pF
(1)
C
2
6pF
(1)
DV
DD
AGND
DGND
DGND
AV
DD
DV
DD
XTAL
AGND
1.0µF
R
1
10kΩ
NOTE: (1) Acceptable capacitive load not to exceed 6pF (±30%).