PAC1934 datasheet(14/64 Pages) MICROCHIP

14 / 64 page

PAC1931/2/3/4

DS20005850E-page 14

 2017-2019 Microchip Technology Inc.

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

3.1

SenseN+/SenseN– (N=1,2,3,4)

These two pins form the differential input for measuring

voltage across a sense resistor in the application. The

positive input (SenseN+) also acts as the input pin for

bus voltage.

3.2

Ground (GND)

System ground.

3.3

SMBus Data (SM_DATA)

This is the bi-directional SMBus data pin. This pin is

open drain, and requires a pull-up resistor to VDD I/O.

3.4

SMBus Clock (SM_CLK)

This is the SMBus clock input pin.

3.5

Positive Power Supply Voltage

(VDD)

Power supply input pin for the device. 2.7-5.5V range,

bypass with 100 nF ceramic capacitor to ground near

the IC.

3.6

Digital Power Reference Voltage

(VDD I/O)

Connect this pin to the power supply voltage for the

digital controller driving the SMBus pins and digital

input pins for the device, 1.62V-5.5V. Bypass with

100 nF ceramic capacitor to ground near the IC. This

pin does not supply power, instead it acts as the VIH

reference.

TABLE 3-1:

PIN DESCRIPTIONS

QFN

WLCSP16

Symbol

Pin Type

Description

1C3

SLOW/ALERT

Digital I/O pin

Voltage range is set by VDD I/O pin. Default function is

SLOW, may be programmed to function as ALERT pin

(Open Collector when functioning as ALERT, requires pull-up

resistor to VDD I/O).

2A4

VDD

Power for IC

Positive power supply voltage

GND

Ground pin

Ground for the IC

SM_CLK

SMBus clock input

Clock Input pin

SM_DATA

SMBus data I/O

Open drain requires pull-up resistor to VDD I/O

ADDRSEL

Analog I/O pin

Address selection for the SMBus Slave address

7(1)

C1(2)

SENSE3

32V analog pin

0-32V range, connect to load side of sense resistor

8(1)

D1(2)

SENSE3+

32V analog pin

0-32V range, connect to supply side of sense resistor

9(1)

D2(2)

SENSE4

32V analog pin

0-32V range, connect to load side of sense resistor

10(1)

D3(2)

SENSE4+

32V analog pin

0-32V range, connect to supply side of sense resistor

SENSE1+

32V analog pin

0-32V range, connect to supply side of sense resistor

SENSE1

32V analog pin

0-32V range, connect to load side of sense resistor

A1(2)

SENSE2+

32V analog pin

0-32V range, connect to supply side of sense resistor

B1(2)

SENSE2-

32V analog pin

0-32V range, connect to load side of sense resistor

VDD I/O

Sets VIH

reference for digital

I/O

Digital power reference level for digital I/O

PWRDN

Digital input pin

Voltage range is set by VDD I/O pin. Active low puts the

device in power-down state (all circuitry is powered down

including SMBus).

—

N/C

The Exposed pad is not electrically connected

Note 1: For PAC1932, pins 7,8,9,10 are not connected inside and should be grounded.

For PAC1933, pins 9 and 10 are not connected inside and should be grounded.

2: For PAC1931, solder balls on A1, B1, C1, D1, D2, and D3 are present but the channels are disabled internally and

should be grounded. For PAC1932, solder balls on C1, D1, D2, and D3 are present but the channels are disabled

internally and should be grounded. For PAC1933, solder balls on D2 and D3 are present but the channels are disabled

internally and should be grounded.

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