ADM1168

Rev. 0 | Page 7 of 28

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

NC = NO CONNECT.

DO NOT CONNECT TO THIS PIN.

12

25

32

8

9

17

16

4

VX1

VX2

VX3

VX4

VP1

VP2

VP3

VH

PDO1

PDO2

PDO3

PDO4

PDO5

PDO6

PDO7

PDO8

PIN 1

INDICATOR

ADM1168

TOP VIEW

(Not to Scale)

Figure 3. Pin Configuration

Table 4. Pin Function Descriptions

Pin No.

Mnemonic

Description

1 to 4

VX1 to VX4

High Impedance Inputs to Supply Fault Detectors. Fault thresholds can be set from 0.573 V to 1.375 V.

Alternatively, these pins can be used as general-purpose digital inputs.

5 to 7

VP1 to VP3

Low Voltage Inputs to Supply Fault Detectors. Three input ranges can be set by altering the input attenuation

on a potential divider connected to these pins, the output of which connects to a supply fault detector.

These pins allow thresholds from 2.5 V to 6 V, from 1.25 V to 3 V, and from 0.573 V to 1.375 V.

8

VH

High Voltage Input to Supply Fault Detectors. Three input ranges can be set by altering the input attenuation

on a potential divider connected to this pin, the output of which connects to a supply fault detector.

This pin allows thresholds from 6 V to 14.4 V and from 2.5 V to 6 V.

9

AGND1

Ground Return for Input Attenuators.

10

REFGND1

Ground Return for On-Chip Reference Circuits.

11, 13 to 16

NC

No Connect.

12

REFOUT

Reference Output, 2.048 V. Note that a capacitor must always be connected between this pin and REFGND.

A 10 μF capacitor is recommended for this purpose.

17 to 24

PDO8 to PDO1

Programmable Output Drivers.

25

PDOGND1

Ground Return for Output Drivers.

26

VCCP

Central Charge-Pump Voltage of 5.25 V. A reservoir capacitor must be connected between this pin and

GND. A 10 μF capacitor is recommended for this purpose.

27

A0

Logic Input. This pin sets the seventh bit of the SMBus interface address.

28

A1

Logic Input. This pin sets the sixth bit of the SMBus interface address.

29

SCL

SMBus Clock Pin. Bidirectional open drain requires external resistive pull-up.

30

SDA

SMBus Data Pin. Bidirectional open drain requires external resistive pull-up.

31

VDDCAP

Device Supply Voltage. Linearly regulated from the highest of the VPx and VH pins to a typical of 4.75 V.

A capacitor must be connected between this pin and GND. A 10 μF capacitor is recommended for

this purpose.

32

GND1

Supply Ground.