TMP102_13 datasheet(5/22 Pages) TI

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I/O

Control

Interface

SCL

SDA

Temperature

Configuration

LOW

HIGH

Pointer

Device

0.01mF

V+

GND

ALERT

(Output)

ADD0

SCL

SDA

Two-Wire

Controller

NOTE:SCL,SDA,andALERT

pinsrequirepull-upresistors.

TMP102

www.ti.com

SBOS397C – AUGUST 2007 – REVISED OCTOBER 2012

APPLICATION INFORMATION

POINTER REGISTER

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.

which of the data registers should respond to a read

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

or write command. Table 1 identifies the bits of the

ALERT. A 0.01

μF bypass capacitor is recommended,

Pointer Register byte. During a write command, P2

as shown in Figure 7.

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

air temperature. A thermally-conductive adhesive is

Table 1. Pointer Register Byte

helpful in achieving accurate surface temperature

measurement.

Table 2. Pointer Addresses

Temperature Register (Read Only)

Configuration Register (Read/Write)

TLOW Register (Read/Write)

THIGH Register (Read/Write)

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