TCN75A_1 Datasheet, PDF (9/40 Pages) Microchip Technology – 2-Wire Serial Temperature Sensor

TCN75A
3.0 PIN DESCRIPTION
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
MSOP, SOIC
1
2
3
4
5
6
7
8
Symbol
SDA
SCL
ALERT
GND
A2
A1
A0
V_DD
Bidirectional Serial Data
Serial Clock Input
Temperature Alert Output
Ground
Address Select Pin (bit 2)
Address Select Pin (bit 1)
Address Select Pin (bit 0)
Power Supply Input
Function
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_DD)
V_DD 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 Table 3-2.
TABLE 3-2: SLAVE ADDRESS
Device
A6 A5 A4 A3 A2 A1 A0
TCN75A
1001XXX
Note: User-selectable address is shown by X.
 2010 Microchip Technology Inc.
DS21935D-page 9