PAC1941T-1ESLASH4MX. datasheet(18/96 Pages) MICROCHIP

18 / 96 page

PAC194X

DS20006543A-page 18

 2021 Microchip Technology Inc.

3.1

SENSE[N]+/- (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 (SENSE[N]+) also acts as the input pin

for bus voltage.

3.2

Ground (GND)

System ground.

3.3

SMBus Data (SM_DATA)

This is the bidirectional SMBus data pin. This pin is

open-drain and requires a pull-up resistor to VDD.

3.4

SMBus Clock (SM_CLK)

This is the SMBus clock input pin and requires an

external pull-up resistor, except if used in High-Speed

mode, which requires a CMOS driver from the host.

3.5

Positive Power Supply Voltage

(VDD)

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

bypass with 100 nF ceramic capacitor to ground near

the IC.

3.6

Address Selection (ADDRSEL)

Connect a resistor from this pin to ground to select the

SMBus address.

TABLE 3-2:

PAC194X-2 PIN FUNCTION TABLE

VQFN

WLCSP

Symbol

Pin Type

Description

SLOW/ALERT1

Digital I/O Pin

Default: SLOW input pin. When high, all channels

sample at 8 SPS. The pin may be programmed to

function as the ALERT1 pin or GPIO (open-drain).

2A4

VDD

Power for IC

Positive power supply voltage.

GND

Ground Pin

Ground for the IC.

SCL

SMBus Clock

Input

Clock Input pin requires a pull-up resistor VDD voltage

for the digital controller.

SDA

SMBus Data I/O

Open-drain requires a pull-up resistor VDD voltage for

the digital controller.

ADDRSEL

Analog I/O Pin

Address selection for the SMBus client address.

7C1(2)

VBUS2-(1)

Analog Input Pin

0-FSR, connect to the ground sense point for VBUS2.

8D1(2)

VBUS2+(1)

Analog Input Pin

0-FSR, connect to VBUS2+.

9D2(2)

SENSE2-(1)

Analog Input Pin

0-FSR, connect to the low side of the sense resistor.

D3(2)

SENSE2+(1)

Analog Input Pin

0-FSR, connect to the low side of the sense resistor.

SENSE1+

Analog Input Pin

0-FSR, connect to the low side of the sense resistor.

SENSE1-

Analog Input Pin

0-FSR, connect to the low side of the sense resistor.

VBUS1+

Analog Input Pin

0-FSR, connect to VBUS1+.

VBUS1-

Analog Input Pin

0-FSR, connect to the ground sense point for VBUS1.

GPIO/ALERT2

Digital I/O Pin

Default: GPIO, Input mode. May be programmed to

be the ALERT2 pin indicator (open-drain) or the GPIO

function (open-drain).

PWRDN

Digital Input Pin

Active-low puts the device in a Power-Down state (all

circuitry is powered down, including SMBus).

—

N/C

The Exposed Pad is not electrically connected.

Note 1: VQFN Package: for PAC1941-2, pins 7, 8, 9 and 10 are not connected inside and must be grounded.

2: WLCSP: for PAC1942-2, pins C1, D1, D2 and D3 are inactive and must be grounded

3: Analog Input pins: for any unused channels, connect the SENSE+ and SENSE- pins to ground. Voltage

may be applied to the analog input pins before or after VDD is applied to the device. For the PAC194X-2

devices, the SENSE+ and SENSE- pins have a Common-mode range from 0V to 9V.

4: For the analog input pins, the safe operating voltage range is up to 9V.

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