MCP9805 datasheet(7/34 Pages) MICROCHIP

7 / 34 page

DS21977B-page 7

MCP9805

3.0

PIN DESCRIPTION

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

TABLE 3-1:

PIN FUNCTION TABLES

3.1

Slave Address Pins (A0, A1, A2 )

A0, A1 and A2 are device slave address input pins.

The address pins correspond to the Least Significant

bits (LSbs) of the address byte (see Section 5.1.4

“Address Byte”). The Most Significant bits A6, A5, A4,

A3 are factory set. This is shown in Table 3-2.

3.2

Ground Pin (GND)

The GND pin is the system ground pin.

3.3

Open-Drain 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 5.0 “Serial

Communication”).

3.4

Open-Drain Serial Clock Line

(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 or master controller on the bus.

(See Section 5.0 “Serial Communication”).

3.5

Open-Drain Temperature Event

Output pin (Event)

The MCP9805 Event pin is an open-drain output. The

device outputs a signal when the ambient temperature

goes beyond the user-programmed temperature limit.

(see Section 4.2.3 “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.

DFN/TSSOP

Symbol

Pin Function

Slave Address

GND

Ground

SDA

Serial Data Line

SCLK

Serial Clock Line

Event

Temperature Event Output

8VDD

Power

TABLE 3-2:

MCP9805 ADDRESS BYTE

Device

Address Code

Slave Address

A5 A4 A3

MCP9805

Note:

User-selectable address is shown by X.

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