2015-2016 Microchip Technology Inc. DS20005386B-page 11
PAC1710/20
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Tabl e 3-1.
3.1 Sense1+/Sense1-
These two pins form the differential input for measuring
voltage across a sense resistor in the application. The
positive input (Sense1+) also acts as the input pin for
bus voltage.
3.2 Sense2+/Sense2- (PAC1720 only)
These two pins form the differential input for measuring
voltage across a sense resistor in the application. The
positive input (Sense2 +) also acts as the input pin for
bus voltage.
3.3 Ground (GND)
System ground.
3.4 Address Selection (ADDR_SEL)
Address selection for the SMBus Slave address, based
on the pull-down resistor.
3.5 SMBus ALERT (ALERT)
This pin is the SMBus ALERT pin that is asserted under
fault conditions.
3.6 SMBus Data (SMDATA)
This is the bidirectional SMBus data pin. This pin is
open drain, and requires a pull-up resistor.
3.7 SMBus Clock (SMCLK)
This is the SMBus clock pin. This pin is open drain, and
requires a pull-up resistor.
3.8 Positive Power Supply Voltage
(V
DD
)
Power supply input pin for the device.
3.9 Exposed Thermal Pad (EP)
This pad should be connected to ground for noise
immunity.
TABLE 3-1: PIN DESCRIPTIONS
PAC1710/20
3x3 VDFN
Symbol
Type
(See Table 3-2)
Description
1 SENSE1+ AIO40 VBUS1/VSENSE1+ input
2 SENSE1- AIO40 VSENSE1- input
3 SENSE2+ AIO40 VBUS2/VSENSE2+ input
4 SENSE2- AIO40 VSENSE2- input
5 GND Power Ground
6 ADDR_SEL AIO Selects SMBus/I
2
C™ address
7ALERTDO SMBus Alert Pin
8 SMDATA DIOD SMDATA: SMBus - requires pull-up resistor
9 SMCLK DI SMCLK: SMBus - requires pull-up resistor
10 V
DD
Power Positive power supply voltage
11 EP — Not internally connected, but recommend grounding.
TABLE 3-2: PIN TYPES DESCRIPTION
Pin Type Description
Power This pin is used to power the device
AIO40 Analog Input/Output
– this pin is used as
an I/O for analog signals.
Maximum voltage is 40V.
AIO5 Analog Input/Output – this pin is used as
an I/O for analog signals.
Maximum voltage is 5V.
DI Digital Input – this pin is used for digital
inputs
DIOD Digital Input/Output Open Drain
– this pin
is used for digital I/O and is open drain
