MCP9808 datasheet(11/52 Pages) MICROCHIP

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DS25095A-page 11

MCP9808

3.0

PIN DESCRIPTION

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

3.1

Serial Data Line (SDA)

SDA is a bidirectional input/output pin, used to serially

transmit data to/from the host controller. This pin

requires a pull-up resistor. (See

Section 4.0 “Serial

Communication”.)

3.2

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”.)

3.3

Temperature Alert, Open-Drain

Output (Alert)

The MCP9808 temperature Alert output pin is an

open-drain output. The device outputs a signal when the

ambient temperature goes beyond the user-programmed

temperature limit. (See

Section 5.2.3 “Alert Output

Configuration”).

3.4

Ground Pin (GND)

The GND pin is the system ground pin.

3.5

Address Pins (A0, A1, A2)

These pins are device address input pins.

The address pins correspond to the Least Significant

bits (LSbs) of the address bits and the Most Significant

bits (MSbs): A6, A5, A4, A3. This is illustrated in

Table 3-2.

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. The EP

may be connected to the system ground on the Printed

Circuit Board (PCB).

TABLE 3-1:

PIN FUNCTION TABLE

DFN

MSOP

Symbol

Pin Function

SDA

Serial Data Line

SCL

Serial Clock Line

Alert

Temperature Alert Output

GND

Ground

Slave Address

VDD

Power Pin

—

Exposed Thermal Pad (EP); must be connected to GND

TABLE 3-2:

MCP9808 ADDRESS BYTE

Device

Address Code

Slave

Address

A6 A5 A4 A3

A1 A0

MCP9808

011

x(1)

MCP9808(2)

001

Note 1: User-selectable address is shown by ‘x’.

A2, A1 and A0 must match the

corresponding device pin configuration.

2: Contact factory for this address code.

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