ADM1068

Preliminary Technical Data

Rev. PrB | Page 6 of 28

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

1

24

25

32

8

9

17

16

VX1

VX2

VX3

VX4

VP1

VP2

VP3

VH

PDO1

PDO2

PDO3

PDO4

PDO5

PDO6

PDO7

PDO8

NC = NO CONNECT

PIN 1

INDICATOR

ADM1068

TOP VIEW

(Not to Scale)

Figure 3. LQFP Pin Configuration

Table 2. Pin Function Descriptions

Pin No.

Mnemonic

Description

11, 13-16

NC

No connection.

1–4

VX1–4

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.

5–7

VP1–3

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 6.0 V, 1.25 V to 3.00 V, and 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 6.0 V to 14.4 V and 2.5 V to 6.0 V.

9

AGND

Ground Return for Input Attenuators.

10

REFGND

Ground Return for On-Chip Reference Circuits.

12

REFOUT

2.048 V Reference Output.

17-24

PDO8–1

Programmable Output Drivers.

25

PDOGND

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.

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. Open-drain output requires external resistive pull-up.

30

SDA

SMBus Data I/O Pin. Open-drain output requires external resistive pull-up.

31

VDDCAP

Device Supply Voltage. Linearly regulated from the highest of the VP1–3, VH pins to a typical of 4.75 V.

32

GND

Supply Ground.