TMP102 datasheet(5/19 Pages) BURR-BROWN

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APPLICATION INFORMATION

POINTER REGISTER

TMP102

0.01mF

V+

GND

2

5

3

ALERT

(Output)

4

ADD0

1

SCL

6

SDA

To

Two-Wire

Controller

NOTE:SCL,SDA,andALERT

pinsrequirepull-upresistors.

I/O

Control

Interface

SCL

SDA

Temperature

Register

Configuration

Register

T

LOW

Register

T

HIGH

Register

Pointer

Register

TMP102

SBOS397 – AUGUST 2007

The TMP102 is a digital temperature sensor that is

optimal

for

thermal-management

and

thermal-

Figure 8 shows the internal register structure of the

protection applications. The TMP102 is two-wire- and

TMP102. The 8-bit Pointer Register of the device is

SMBus interface-compatible, and is specified over a

used to address a given data register. The Pointer

temperature range of –40

°C to +125°C.

Register uses the two LSBs (see Table 11) to

identify which of the data registers should respond to

Pull-up resistors are required on SCL, SDA, and

a read or write command. Table 1 identifies the bits

ALERT. A 0.01

μF bypass capacitor is recommended,

of

the

Pointer

Register

byte.

During

a

write

as shown in Figure 7.

command, P2 through P7 must always be '0'.

Table 2 describes the pointer address of the

registers available in the TMP102. Power-up reset

value of P1/P0 is '00'. By default, the TMP102 reads

the temperature on power-up.

Figure 7. Typical Connections

The temperature sensor in the TMP102 is the chip

itself. Thermal paths run through the package leads,

as well as the plastic package. The lower thermal

resistance of metal causes the leads to provide the

primary thermal path.

To maintain accuracy in applications requiring air or

Figure 8. Internal Register Structure

surface temperature measurement, care should be

taken to isolate the package and leads from ambient

Table 1. Pointer Register Byte

air temperature. A thermally-conductive adhesive is

helpful in achieving accurate surface temperature

P7

P6

P5

P4

P3

P2

P1

P0

measurement.

0

Register Bits

Table 2. Pointer Addresses

P1

P0

REGISTER

0

Temperature Register (Read Only)

0

1

Configuration Register (Read/Write)

1

0

TLOW Register (Read/Write)

1

THIGH Register (Read/Write)

5

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