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AD7719

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Table XVI. IOCON (I/O and Current Source Control Register) Bit Designations

Bit

Location

Name

Description

IOCON15

PSW2

Power Switch 2 Control Bit.

Set by user to enable Power switch P2 to PWRGND.

Cleared by user to enable use as a standard I/O pin.

When the ADC is in standby mode the power switches are open.

IOCON14

PSW1

Power Switch 1 Control Bit.

Set by user to enable Power switch P1 to PWRGND.

Cleared by user to enable use as a standard I/O pin.

When ADC is in standby mode the power switches are open.

IOCON13

This bit must be zero for correct operation.

IOCON12

Burnout Current Enable Bit.

Set by user to enable the 100 nA current sources in the Main ADC signal path. A 100 nA current

source is applied to the positive input leg while a 100 nA sink is applied to the negative input.

Cleared by user to disable both transducer burnout current sources.

IOCON11

I2PIN

IEXE2, 200

µA Current Source Direction Bit.

Set by user to enable IEXC2 current source to IOUT1.

Cleared by user to enable IEXC2 current source to IOUT2.

IOCON10

I1PIN

IEXE1, 200

µA Current Source Direction Bit.

Set by user to enable IEXC1 current source to IOUT2.

Cleared by user to enable IEXC1 current source to IOUT1.

IOCON9

I2EN

IEXC2 Current Source Enable Bit.

Set by user to turn on the IEXC2 excitation current source.

Cleared by user to turn off the IEXC2 excitation current source.

IOCON8

I1EN

IEXC1 Current Source Enable Bit.

Set by user to turn on the IEXC1 excitation current source.

Cleared by user to turn off the IEXC1 excitation current source.

IOCON7

P4DIR

P4, I/O Direction Control Bit.

Set by user to enable P4 as an output.

Cleared by user to enable P4 as an input. There are weak active pull-ups internally when enabled

as an input.

IOCON6

P3DIR

P3, I/O Direction Control Bit.

Set by user to enable P3 as an output.

Cleared by user to enable P3 as an input. There are weak active pull-ups internally when enabled

as an input.

IOCON5

P2EN

P2 Digital Output Enable Bit.

Set by user to enable P2 as a regular digital output pin.

Cleared by user to three-state P2 output.

PSW2 takes precedence over P2EN.

IOCON4

P1EN

P1 Digital Output Enable Bit.

Set by user to enable P1 as a regular digital output pin.

Cleared by user to three-state P1 output.

PSW1 takes precedence over P1EN.

IOCON3

P4DAT

Digital I/O Port Data Bits.

IOCON2

P3DAT

IOCON1

P2DAT

IOCON0

P1DAT

The readback value of these bits indicate the status of their respective pin when the I/O port is

active as an input.

The values written to these data bits appear at the output port when the I/O bits are enabled as

outputs.

P2 and P1 are outputs only, so reading P2DAT and P1DAT will return what was last written to

these bits.

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