MCP9808
3.0
PIN DESCRIPTION
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
DFN
PIN FUNCTION TABLE
MSOP
Symbol
Pin Function
1
2
3
4
5
6
7
8
9
1
2
SDA
SCL
Alert
GND
A2
Serial Data Line
Serial Clock Line
Temperature Alert Output
Ground
3
4
5
Slave Address
Slave Address
Slave Address
Power Pin
6
A1
7
A0
8
VDD
EP
—
Exposed Thermal Pad (EP); must be connected to GND
3.1
Serial Data Line (SDA)
3.5
Address Pins (A0, A1, A2)
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”.)
These pins are device address input pins.
The address pins correspond to the Least Significant
bits (LSbs) of the address bits and the Most Significant
bits (MSbs): A6, A5, A4, A3. This is illustrated in
Table 3-2.
3.2
Serial Clock Line (SCL)
TABLE 3-2:
Device
MCP9808 ADDRESS BYTE
Address Code
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”.)
Slave
Address
A6 A5 A4 A3 A2 A1 A0
MCP9808
MCP9808(2)
0
1
0
0
1
0
1
1
x(1)
x
x
x
x
3.3
Temperature Alert, Open-Drain
Output (Alert)
x
Note 1: User-selectable address is shown by ‘x’.
A2, A1 and A0 must match the
The MCP9808 temperature Alert 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 “Alert Output
Configuration”).
corresponding device pin configuration.
2: Contact factory for this address code.
3.6
Power Pin (V
)
DD
VDD is the power pin. The operating voltage range, as
specified in the DC electrical specification table, is
applied on this pin.
3.4
Ground Pin (GND)
The GND pin is the system ground pin.
3.7
Exposed Thermal Pad (EP)
There is an internal electrical connection between the
Exposed Thermal Pad (EP) and the GND pin. The EP
may be connected to the system ground on the Printed
Circuit Board (PCB).
© 2011 Microchip Technology Inc.
DS25095A-page 11
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