Datasheet

 2010 Microchip Technology Inc. DS21935D-page 9

TCN75A

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)

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 (SCL)

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 controller on the bus.

3.3 Power Supply Input (V

)

is the power pin. The operating voltage, as

specified in the DC electrical specification table, is

applied on this pin.

3.4 Ground (GND)

GND is the system ground pin.

3.5 ALERT Output

The TCN75A’s ALERT pin is an open-drain output. The

device outputs an alert signal when the ambient

temperature goes beyond the user-programmed

temperature limit.

3.6 Address Pins (A2, A1, A0)

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

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 Tab l e 3 - 2.

MSOP, SOIC Symbol Function

1 SDA Bidirectional Serial Data

2 SCL Serial Clock Input

3 ALERT Temperature Alert Output

4 GND Ground

5 A2 Address Select Pin (bit 2)

6 A1 Address Select Pin (bit 1)

7 A0 Address Select Pin (bit 0)

Power Supply Input

TABLE 3-2: SLAVE ADDRESS

Device A6 A5 A4 A3 A2 A1 A0

TCN75A 1001XXX

Note: User-selectable address is shown by X.