AD7709

–14–

REV. PrA

January 2001

PRELIMINARY TECHNICAL DATA

CONFIG23

CONFIG22 CONFIG21 CONFIG20

CONFIG19 CONFIG18

CONFIG17

CONFIG16

PSW1(0)

PSW2(0)

I3EN1 (0)

I3EN1(0)

I2EN1(0)

I2EN0(0)

I1EN1(0)

I1EN0(0)

CONFIG15

CONFIG14 CONFIG13 CONFIG12

CONFIG11 CONFIG10

CONFIG9

CONFIG8

P4DIG(0)

P3DIG(0)

P2EN(0)

P1EN(0)

P4DAT(0)

P3DAT(0)

P2DAT(0)

P1DAT(0)

CONFIG7

CONFIG6

CONFIG5

CONFIG4

CONFIG3

CONFIG2

CONFIG1

CONFIG0

REFSEL(0)

CH2(0)

CH1(0)

CH0(0)

UNI(0)

RN2(0)

RN1(0)

RN0(0)

Table VI. Configuration Register Bit Designations

Bit

Bit

Location

Mnemonic

Description

CONFIG23

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.

CONFIG22

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 ADC is in standby mode the power switches are open.

CONFIG21

I3EN1

Current Source Enable Bits. Used in conjunction with bit I3EN0 to determine the function

of current source I3

CONFIG20

I3EN0

Current Source Enable Bits. Used in conjunction with bit I3EN1 to determine the function

of current source I3

I3EN1

I3EN0

Function

0

0

Current Source OFF

0

1

Current Source Routed to IOUT1 pin.

1

0

Current Source Routed to IOUT2 pin.

1

1

Current Source Routed to GND

CONFIG19

I2EN1

Current Source Enable Bits. Used in conjunction with bit I2EN0 to determine the function

of current source I2

CONFIG18

I2EN0

Current Source Enable Bits. Used in conjunction with bit I2EN1 to determine the function

of current source I2

I2EN1

I2EN0

Function

0

0

Current Source OFF

0

1

Current Source Routed to IOUT1 pin.

1

0

Current Source Routed to IOUT2 pin.

1

1

Current Source Routed to GND

CONFIG17

I1EN1

Current Source Enable Bits. Used in conjunction with bit I1EN0 to determine the function

of current source I3

CONFIG16

I1EN0

Current Source Enable Bits. Used in conjunction with bit I1EN1 to determine the function

of current source I3

I1EN1

I1EN0

Function

0

0

Current Source OFF

0

1

Current Source Routed to IOUT1 pin.

1

0

Current Source Routed to IOUT2 pin.

1

1

Current Source Routed to GND

CONFIG15

P4DIG

Digital Input Enable

Set by user to enable P4 as a digital input

Cleared by user to configure as pin P4/AIN4 as analog input.