TMP106 datasheet(5/20 Pages) TI2

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TMP106

SLLS672A − OCTOBER 2005 − REVISED JANUARY 2006

www.ti.com

APPLICATIONS INFORMATION

The TMP106 is a digital temperature sensor that is optimal

for

thermal

management

and

thermal

protection

applications. The TMP106 is Two-Wire and SMBus

interface-compatible, and is specified over a temperature

range of −40

°C to +125°C.

The TMP106 requires no external components for

operation except for pull-up resistors on SCL, SDA, and

ALERT,

although

0.1

µF bypass capacitor is

recommended, as shown in Figure 1.

TMP106

0.1

µF

V+

GND

ALERT

(Output)

SCL

SDA

Two−Wire

Controller

NOTE:SCL,SDA,and ALERT

pins require pull−up resistors.

Figure 1. Typical Connections of the TMP106

The sensing device of the TMP106 is the chip itself.

Thermal paths run through the package leads. The lower

thermal resistance of metal causes the leads to provide the

primary thermal path.

To maintain accuracy in applications requiring air or

surface temperature measurement, care should be taken

to isolate the package and leads from ambient air

temperature.

POINTER REGISTER

Figure 2 shows the internal register structure of the

TMP106. The 8-bit Pointer Register of the device is used

to address a given data register. The Pointer Register uses

the two LSBs to identify which of the data registers should

respond to a read or write command. Table 1 identifies the

bits of the Pointer Register byte. Table 2 describes the

pointer address of the registers available in the TMP106.

Power-up reset value of P1/P0 is 00.

Table 1. Pointer Register Byte

I/O

Control

Interface

SCL

SDA

Temperature

Configuration

LOW

HIGH

Pointer

Figure 2. Internal Register Structure of the

TMP106

Temperature Register (Read Only)

Configuration Register (Read/Write)

TLOW Register (Read/Write)

THIGH Register (Read/Write)

Table 2. Pointer Addresses of the TMP106

TEMPERATURE REGISTER

The Temperature Register of the TMP106 is a 12-bit,

read-only register that stores the output of the most recent

conversion. Two bytes must be read to obtain data, and are

described in Table 3 and Table 4. Note that byte 1 is the

most significant byte; byte 2 is the least significant byte.

The first 12 bits are used to indicate temperature, with all

remaining bits equal to zero. The least significant byte

does not have to be read if that information is not needed.

Data format for temperature is summarized in Table 5.

Following power-up or reset, the Temperature Register will

°C until the first conversion is complete.

T11

T10

Table 3. Byte 1 of Temperature Register

Table 4. Byte 2 of Temperature Register

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