TCN75A
3.0
PIN DESCRIPTION
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
MSOP, SOIC
1
2
3
4
5
6
7
8
PIN FUNCTION TABLE
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)
3.5
ALERT Output
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.
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.
3.2
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.
3.6
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.
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.
TABLE 3-2:
Device
TCN75A
Note:
SLAVE ADDRESS
A6
1
A5
0
A4
0
A3
1
A2
X
A1
X
A0
X
3.4
Ground (GND)
GND is the system ground pin.
User-selectable address is shown by X.
©
2006 Microchip Technology Inc.
DS21935C-page 7
MICROCHIP [ MICROCHIP TECHNOLOGY ]
