Power Supplies
Table 2. J7: Serial Interface Pins (continued)
Pin No.
Pin Name
Signal Name
I/O Type
Pullup
Function
J7.13
DR
DOUT/DRDY
Out
None
ADS1247 data out
J7.14
GPIO4
Unused
-
—
None
J7.15
INT
DRDY
Out
None
J7.16
SCL
SCL
I
2
C
High
I
2
C clock
J7.17
TOUT
CLK
In
None
Can be used to provide
a clock from a
processor
J7.18
DGND
DGND
In/Out
None
Digital ground
J7.19
GPIO5
CLK Select
—
None
J7.20
SDA
SDA
I
2
C
High
I
2
C data
Many pins on J7 have weak pull-up resistors. These resistors provide default settings for many of the
control pins. Many pins on J7 correspond directly to ADS1247 pins. See the
for
complete details on these pins.
4
Power Supplies
J3 is the power-supply input connector.
lists the configuration details for J3.
Table 3. J3 Configuration: Power-Supply Input
Pin No.
Pin Name
Function
Required
J3 .1
+VA
Unused
No
J3 .2
–
VA
Unused
No
J3.3
+5VA
+5V analog supply
Always
J3.4
–
5VA
–
5V analog supply
Only in bipolar mode
J3.5
DGND
Digital ground input
Yes
J3.6
AGND
Analog ground input
Yes
J3.7
+1.8VD
1.8V digital supply
No
J3.8
VD1
Unused
No
J3.9
+3.3VD
3.3V digital supply
Always
J3.10
+5VD
+5V digital supply
No
All of the power supplies (AVDD, AVSS, and DVDD) have corresponding jumpers on J10 that can be
replaced with a current meter to measure the respective supply currents.
5
SBAU148B
–
June 2009
–
Revised May 2011
ADS1147EVM, ADS1247EVM, ADS1147EVM-PDK, ADS1247EVM-PDK
Copyright
©
2009
–
2011, Texas Instruments Incorporated
