TMP100, 101

5

SBOS231C

www.ti.com

APPLICATIONS INFORMATION

The TMP100 and TMP101 are digital temperature sensors

optimal for thermal management and thermal protection

interface compatible and are specified over a temperature

range of –55

°C to +125°C.

The TMP100 and TMP101 require no 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.

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 register. The Pointer

Register uses the two LSBs to identify which of the data

registers should respond to a read or write command. Table

I identifies the bits of the Pointer Register byte. Table II

describes the pointer address of the registers available in the

TMP100 and TMP101. Power-up Reset value of P1/P0 is 00.

FIGURE 1. Typical Connections of the TMP101.

TMP101

0.1

µF

V+

GND

2

5

3

4

ADD0

(Input)

ALERT

(Output)

1

6

SCL

SDA

Controller

NOTE: (1) SCL, SDA and ALERT

require pull-up resistors for

FIGURE 2. Typical Connections of the TMP100.

TMP100

0.1

µF

V+

GND

2

5

3

4

ADD0

(Input)

ADD1

(Input)

1

6

SCL

SDA

Controller

NOTE: (1) SCL and SDA

require pull-up resistors for

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.

P7

P6

P5

P4

P3

P2

P1

P0

0

0

0

0

0

0

Register Bits

TABLE I. Pointer Register Byte.

P1

P0

REGISTER

0

0

Temperature Register (READ Only)

0

1

Configuration Register (READ/WRITE)

10

11

TABLE II. Pointer Addresses of the TMP100 and TMP101

Registers.

D7

D6

D5

D4

D3

D2

D1

D0

T11

T10

T9

T8

T7

T6

T5

T4

TABLE III. Byte 1 of Temperature Register.

D7

D6

D5

D4

D3

D2

D1

D0

T3

T2

T1

T0

0

0

0

0

TABLE IV. Byte 2 of Temperature Register.

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 III and Table IV. The first 12 bits are used

to indicate temperature with all remaining bits equal to zero.

Data format for temperature is summarized in Table V.

Following power-up or reset, the Temperature Register will

read 0

°C until the first conversion is complete.

FIGURE 3. Internal Register Structure of TMP100 and TMP101.

I/O

Control

Interface

SCL

SDA

Temperature

Register

Configuration

Register

T

LOW

Register

T

HIGH

Register

Pointer

Register