MCP9802 Microchip Technology Inc., MCP9802 Datasheet - Page 7

• Manufacturer Part Number: MCP9802
• Description: 2-wire High-accuracy Temperature Sensor
• Manufacturer: Microchip Technology Inc.

3.0
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
3.1
The 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
The SCLK 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
The V
specified in the DC electrical specification table, is
applied on this pin.
3.4
The GND pin is the system ground pin.
 2004 Microchip Technology Inc.
MCP9800
MCP9802
SOT-23-5
DD
PIN DESCRIPTION
Serial Data Pin (SDA)
Serial Clock Pin (SCLK)
Power Supply Input (V
pin is the power pin. The operating voltage, as
Ground (GND)
—
—
—
5
4
3
2
1
PIN FUNCTION TABLE
MSOP, SOIC
MCP9801
MCP9803
1
2
3
4
5
6
7
8
DD
)
Symbol
ALERT
SCLK
GND
SDA
V
A2
A1
A0
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
3.5
The MCP9800/1/2/3’s ALERT pin is an open-drain
output pin. The device outputs an alert signal when the
ambient
programmed temperature limit.
3.6
These pins are device or slave address input pins and
are available only with the MCP9801/03. The device
addresses for the MCP9800/02 are factory-set.
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:
MCP9801/03
MCP9800/02A0
MCP9800/02A5
Note:
Device
ALERT Output
Address Pins (A2, A1, A0)
temperature
User-selectable address is shown by X.
MCP9800/1/2/3
SLAVE ADDRESS
A6
1
1
1
Function
A5
0
0
0
goes
A4
0
0
0
beyond
A3
1
1
1
DS21909B-page 7
A2
X
0
1
the
A1
X
0
0
user-
A0
X
0
1