TMP100−EP, TMP101−EP

DIGITAL TEMPERATURE SENSOR

SGLS254A − JULY 2005 - REVISED APRIL 2010

7

POST OFFICE BOX 655303

APPLICATION INFORMATION

configuration register

The configuration register is an 8-bit read/write register used to store bits that control the operational modes

of the temperature sensor. Read/write operations are performed MSB first. The format of the configuration

register for the TMP100 and TMP101 is shown in Table 6, followed by a breakdown of the register bits. The

power-up/reset value of the configuration register is all bits equal to 0. The OS/ALERT bit will read as 1 after

power-up/reset.

Byte

D7

D6

D5

D4

D3

D2

D1

D0

1

OS/ALERT

R1

R0

F1

F0

POL

TM

SD

Table 6. Configuration Register Format

shutdown mode (SD)

The shutdown mode of the TMP100 and TMP101 allows the user to save maximum power by shutting down

all device circuitry other than the serial interface, which reduces current consumption to less than 1

μA. For the

TMP100 and TMP101, shutdown mode is enabled when the SD bit is 1. The device shutdowns once the current

conversion is completed. For SD equal to 0, the device maintains continuous conversion.

thermostat mode (TM)

The thermostat mode bit of the TMP101 indicates to the device whether to operate in comparator mode (TM = 0)

or interrupt mode (TM = 1). For more information on comparator and interrupt modes, see the high and low limit

registers and SMBus alert function sections.

polarity (POL)

The polarity bit of the TMP101 allows the user to adjust the polarity of the ALERT pin output. If POL = 0, the

ALERT pin will be active low as shown in Figure 4. For POL = 1, the ALERT pin will be active high and the state

of the ALERT pin is inverted.

Measured

Temperature

TMP101 ALERT PIN

(Comparator Mode)

POL = 0

TMP101 ALERT PIN

(Interrupt Mode)

POL = 0

TMP101 ALERT PIN

(Comparator Mode)

POL = 1

TMP101 ALERT PIN

(Interrupt Mode)

POL = 1

Read

Read

Time

Read

Figure 4. Output Transfer Function Diagrams