MCP9902 datasheet(8/50 Pages) MICROCHIP

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MCP9902/3/4

DS20005382C-page 8

 2015-2016 Microchip Technology Inc.

3.0

PIN DESCRIPTIONS

The MCP9902/3/4 has two variants that include

features unique to each device. Refer to the table to

determine applicability of the pin descriptions.

The description of the pins is listed in Table 3-1.

3.1

Power Supply (VDD)

This pin is used to supply power to the device.

3.2

Diode 1 Pair (DN1/DP1)

Remote Diode 1 anode (DP1) and cathode (DN1) pins

for the MCP9902/3/4.

3.3

Diode 2 Pair (DN2/DP2)

Remote Diode 2 anode (DP2) and cathode (DN2) pins

for the MCP9903.

3.4

Anti-Parallel Diode Pair (DN3/DP2

and DN2/DP3) (MCP9904 only)

• DP2/DN3: DP2 anode and DN3 cathode

• DN2/DP3: DN2 cathode and DP3 anode

3.5

THERM LIMIT ALERT

(THERM/ADDR)

This pin asserts low when the hardware-set THERM

limit threshold is exceeded by one of the temperature

sensors. The assertion of this signal can’t be controlled

or masked by register setting. If enabled, the SMBus

slave address is set by the pull-up resistor on this pin.

3.6

Ground (GND)

This pin is used for system ground for the device.

3.7

Maskable ALERT

(ALERT/THERM2)

This pin asserts when a diode temperature exceeds

the ALERT threshold. This pin may be masked by

3.8

SMBus Data (SMDATA)

This is the open drain, bidirectional data pin for SMBus

communication.

3.9

SMBus Clock (SMCLK)

This is the SMBus input clock pin for SMBus

communication.

3.10

Exposed Thermal Pad (EP)

Not internally connected, but recommend grounding for

mechanical support.

TABLE 3-1:

PIN FUNCTION TABLE

MCP9902

WDFN

MCP9903

VDFN

MCP9904

VDFN

Name

Type

Description

111

VDD

PPower

222

DP1

Analog

Diode 1/2 Connection

333

DN1

Analog

Diode 1/2 Connection

—4

DP2(1)(/DN3)(2)

Analog

Diode 1/2 Connection

—5

DN2(1)(/DP3)(2)

Analog

Diode 1/2 Connection

566

GND

Ground

477

THERM/ADDR

Non-Maskable THERM

ALERT/THERM2

Maskable ALERT/THERM2

799

SMDATA

SMBus Clock

810

SMCLK

SMBus Data

911

—

Exposed Thermal pad

Note 1:

MCP9903 only.

MCP9904 only.

See Section 3.10 “Exposed Thermal Pad (EP)” for grounding recommendations.

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