MCP9844 datasheet(7/44 Pages) MICROCHIP

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 2013 Microchip Technology Inc.

DS20005192A-page 7

MCP9844

3.0

PIN DESCRIPTION

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

TABLE 3-1:

PIN FUNCTION TABLES

3.1

Address Pins (A0, A1, A2)

These pins are device address input pins.

The address pins correspond to the Least Significant

bits (LSb) of the address bits. The Most Significant bits

(MSb) are A6, A5, A4, A3. Refer to Table 3-2.

All address pins have an internal pull-down resistor.

3.2

Ground Pin (GND)

The GND pin is the system ground pin.

3.3

Serial Data Line (SDA)

The SDA is a bidirectional input/output pin used to seri-

ally transmit data to/from the host controller. This pin

requires a pull-up resistor. (See Section 4.0 “Serial

Communication”

3.4

Serial Clock Line (SCL)

The SCL is a clock input pin. All communication and

timing is relative to the signal on this pin. The clock is

generated by the host or master controller on the bus.

(See Section 4.0 “Serial Communication”.)

3.5

Temperature Alert, Open-Drain

Output (Event)

The MCP9844 temperature Event output pin is an

open-drain output. The device outputs a signal when

the ambient temperature goes beyond the user pro-

grammed temperature limit. (See Section 5.2.3

“Event Output Configuration”

3.6

Power Pin (VDD)

VDD is the power pin. The operating voltage range, as

specified in the DC electrical specification table, is

applied on this pin.

3.7

Exposed Thermal Pad (EP)

There is an internal electrical connection between the

Exposed Thermal Pad (EP) and the GND pin; they can

be connected to the same potential on the Printed Cir-

cuit Board (PCB). This provides better thermal conduc-

tion from the PCB to the die.

MCP9844

Symbol

Description

TDFN

Slave Address

GND

Ground

SDA

Serial Data Line

SCL

Serial Clock Line

Event

Temperature Alert Output

8VDD

Power Pin

Exposed Thermal Pad (EP); can be connected to GND.

TABLE 3-2:

MCP9844 ADDRESS BYTE

Device

Address Code

Slave

Address

Sensor

Note 1:

User selectable address is shown by X,

where X is ‘1’ or ‘0’ for VDD and GND,

respectively

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