TMP100 datasheet(5/19 Pages) TI

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TMP100

TMP101

SBOS231G − JANUARY 2002 − REVISED NOVEMBER 2007

www.ti.com

APPLICATIONS INFORMATION

The TMP100 and TMP101 are digital temperature sensors

optimal for thermal management and thermal protection

applications. The TMP100 and TMP101 are I2C and

SMBus interface-compatible and are specified over a

temperature range of −55

°C to +125°C.

The

TMP100

and

TMP101

require

external

components for operation except for pull-up resistors on

SCL, SDA, and ALERT, although a 0.1

µF bypass

capacitor is recommended, as shown in Figure 1 and

Figure 2.

TMP101

0.1

µF

V+

GND

ADD0

(Input)

ALERT

(Output)

SCL

SDA

To I2C

Controller

NOTE: (1) SCL, SDA and ALERT

require pull−up resistors for

I2C bus applications.

Figure 1. Typical Connections of the TMP101

TMP100

0.1

µF

V+

GND

ADD0

(Input)

ADD1

(Input)

SCL

SDA

To I2C

Controller

NOTE: (1) SCL and SDA

require pull−up resistors for

I2C bus applications.

Figure 2. Typical Connections of the TMP100

The die flag of the lead frame is connected to pin 2. The

sensing device of the TMP100 and TMP101 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. The GND pin of the TMP100 or TMP101 is directly

connected to the metal lead frame, and is the best choice

for thermal input.

To maintain the accuracy in applications requiring air or

surface temperature measurement, care should be taken

to isolate the package and leads from ambient air

temperature. A thermally-conductive adhesive will assist

in achieving accurate surface temperature measurement.

POINTER REGISTER

Figure 3 shows the internal register structure of the

TMP100 and TMP101. The 8-bit Pointer Register of the

TMP100 and TMP101 is used to address a given data

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 TMP100 and

TMP101. Power-up Reset value of P1/P0 is 00.

I/O

Control

Interface

SCL

SDA

Temperature

Configuration

LOW

HIGH

Pointer

Figure 3. Internal Register Structure of the

TMP100 and TMP101

Table 1. Pointer Register Type

Table 2. Pointer Addresses of the TMP100 and

TMP101 Registers

Temperature Register (READ Only)

Configuration Register (READ/WRITE)

TLOW Register (READ/WRITE)

THIGH Register (READ/WRITE)

TEMPERATURE REGISTER

The Temperature Register of the TMP100 or TMP101 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. The first 12 bits

are used to indicate temperature with all remaining bits

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