REV. G

–4–

AD7416/AD7417/AD7418

AD7417 PIN FUNCTION DESCRIPTION

Pin No.

Mnemonic

Description

1, 16

NC

No Connection. Do not connect anything to this pin.

2

SDA

Digital I/O. Serial bus bidirectional data. Push-pull output.

3

SCL

Digital Input. Serial bus clock.

4

OTI

This is a logic output. The overtemperature indicator (OTI) is set if the result of a conversion on

Channel 0 (temperature sensor) is greater than an 8-bit word in the overtemperature register (OTR).

The signal is reset at the end of a serial read operation. Open-drain output.

5

Reference Input. An external 2.5 V reference can be connected to the AD7417 at this pin. To enable the

on-chip reference, the REFIN pin should be tied to GND. If an external reference is connected to the

AD7417, the internal reference will shut down.

6GND

Ground reference for track-and-hold, comparator and capacitor DAC, and digital circuitry.

7–10

Analog Input Channels. The AD7417 has four analog input channels. The input channels are single-ended

nel is selected by writing to the configuration register of the AD7417. (See Control Byte section.)

11

A2

Digital Input. The highest programmable bit of the serial bus address.

12

A1

Digital Input. The middle programmable bit of the serial bus address.

13

A0

Digital Input. The lowest programmable bit of the serial bus address.

14

Positive Supply Voltage, 2.7 V to 5.5 V.

15

CONVST

Logic Input Signal. Convert start signal. The rising edge of this signal fully powers up the part. The

power-up time for the part is 4

µs. If the CONVST pulse is greater than 4 µs, the falling edge of CONVST

places the track-and-hold mode into hold mode and initiates a conversion. If the pulse is less than 4

µs,

an internal timer ensures that the track-and-hold does not go into hold and conversion is not initiated

until the power-up time has elapsed. The track-and-hold goes into track mode again at the end of con-

version. (See Operating Mode section.)

AD7417 PIN CONFIGURATION

SOIC/TSSOP

TOP VIEW

(Not to Scale)

NC = NO CONNECT

NC

SDA

SCL

OTI

GND

NC

CONVST

A0

A1

A2

AD7417

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9