Datasheet

www.ti.com

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

C High I

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

C High I

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 ADS1247 data sheet for

complete details on these pins.

4 Power Supplies

J3 is the power-supply input connector. Table 3 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.

SBAU148B– June 2009– Revised May 2011 ADS1147EVM, ADS1247EVM, ADS1147EVM-PDK, ADS1247EVM-PDK

Submit Documentation Feedback