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Power Supplies

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Power Supplies

Table 2. J7: Serial Interface Pins (continued)

Pin No.

Pin Name

Signal Name

I/O Type

Pullup

Function

J7.12

GPIO3

PWRSEL

In

High

Selects

±2.5V

or +5V supply

J7.13

DR

DOUT/DRDY

Out

None

ADS1246 data

out

J7.14

GPIO4

Unused

—

None

J7.15

INT

DRDY

Out

None

J7.16

SCL

SCL

High

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

High

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 ADS1246 pins. See the ADS1246 data sheet for

complete details on these pins.

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

+3.3VD

3.3V digital supply

Always

J3.9

VD1

Unused

No

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.

SBAU149A – June 2009 – Revised July 2009

ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK

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