MCP9800A0-MSLASHMS datasheet(9/42 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS21909C-page 9

MCP9800/1/2/3

3.0

PIN DESCRIPTION

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

TABLE 3-1:

PIN FUNCTION TABLE

3.1

Serial Data Pin (SDA)

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

serially transmit data to and from the host controller.

This pin requires a pull-up resistor to output data.

3.2

Serial Clock Pin (SCLK)

The SCLK is a clock input pin. All communication and

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

generated by the host controller on the bus.

3.3

Power Supply Input (VDD)

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

specified in the DC electrical specification table, is

applied on this pin.

3.4

Ground (GND)

The GND pin is the system ground pin.

3.5

ALERT Output

The MCP9800/1/2/3’s ALERT pin is an open-drain

output pin. The device outputs an alert signal when the

ambient

temperature

goes

beyond

the

user-programmed temperature limit.

3.6

Address Pins (A2, A1, A0)

These pins are device or slave address input pins and

are available only with the MCP9801/03. The device

addresses for the MCP9800/02 are factory-set.

The address pins are the Least Significant bits (LSb) of

the device address bits. The Most Significant bits

(MSb) (A6, A5, A4, A3) are factory-set to <1001>. This

is illustrated in Table 3-2.

MCP9800

MCP9802

SOT-23-5

MCP9801

MCP9803

MSOP, SOIC

Symbol

Function

SDA

Bidirectional Serial Data

SCLK

Serial Clock Input

ALERT

Temperature Alert Output

GND

Ground

—

Address Select Pin (bit 2)

—

Address Select Pin (bit 1)

—

Address Select Pin (bit 0)

VDD

Power Supply Input

TABLE 3-2:

SLAVE ADDRESS

Device

MCP9800/02A0

10010

MCP9800/02A5

10011

MCP9801/03

1001X

Note:

User-selectable address is shown by X.

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