MCP98243 datasheet(11/62 Pages) MICROCHIP

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DS22153C-page 11

MCP9843/98243

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 address bits. The Most Significant bits

(MSb) (A6, A5, A4, A3). This is shown in Table 3-2.

The A0 Address pin is a multi-function pin. This input

pin is also used for high voltge input VHV to enable the

EEPROM Software Write Protect feature, see

Section 5.3.3 “Write Protection”.

All address pin have an internal pull-down resistors.

3.2

Ground Pin (GND)

The GND pin is the system ground pin.

3.3

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”).

3.4

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 MCP9843/98243 temperature Event 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

“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.

MCP9843/98243

Symbol

Description

DFN, TDFN,

UDFN

TSSOP

Slave Address and EEPROM Software Write Protect high voltage

input (VHV)

Slave Address

GND

Ground

SDA

Serial Data Line

SCL

Serial Clock Line

Event

Temperature Alert Output

VDD

Power Pin

—

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

TABLE 3-2:

MCP9843/98243 ADDRESS

BYTE

Device

Address Code

Slave

Address

A6 A5 A4 A3 A2 A1 A0

Sensor

EEPROM

Write Protect

Note:

User-selectable address is shown by X.

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