AD5749

Rev. 0 | Page 9 of 28

Pin No.

Mnemonic

Description

12, 13

REXT2, REXT1

A 15 kΩ external current setting resistor can be connected between the REXT1 and REXT2 pins to

improve the IOUT temperature drift performance.

14

VREF

Buffered Reference Input.

15

VIN

Buffered Analog Input (0 V to 4.096 V).

16

GND

Ground Connection.

17

AVDD

Positive Analog Supply.

18

IOUT

Current Output.

19, 20, 23, 24

DNC

Do not connect to these pins.

21, 22

GND

Ground Connection.

25, 26, 27, 28

NC

No Connect. Can be tied to GND.

29

HW SELECT

This part is used to configure the part to hardware or software mode.

HW SELECT = 0 selects software control.

HW SELECT = 1 selects hardware control.

30

RESET

In software mode, this pin resets the part to its power-on state. Active low.

In hardware mode, there is no reset. If using the part in hardware mode, the RESET pin should be tied

high.

31

FAULT/TEMP

Fault Alert (FAULT). In software mode, this pin acts as a general fault alert pin. It is asserted low when an

open-circuit, overtemperature error, or PEC interface error is detected. This pin is an open-drain output

and must be connected to a pull-up resistor.

Overtemperature Fault (TEMP). In hardware mode, this pin acts as an overtemperature fault pin. It is

asserted low when an overtemperature error is detected. This pin is an open-drain output and must be

connected to a pull-up resistor.

32

NC/IFAULT

No Connect (NC). In software mode, this pin is a no connect. Instead, tie this pin to GND.

Open-Circuit Fault Alert (IFAULT). In hardware mode, this pin acts as an open-circuit fault alert pin. It is

asserted low when an open-circuit error is detected. This pin is an open-drain output and must be

connected to a pull-up resistor.

33 (EPAD)

EPAD

The exposed paddle is tied to GND.