TMP100, 101

6

SBOS231C

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The user can obtain 9, 10, 11, or 12 bits of resolution by

addressing the Configuration Register and setting the reso-

lution bits accordingly. For 9, 10, or 11 bit resolution, the most

significant bits in the Temperature Register are used with the

unused LSBs set to zero.

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 VI, 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.

FAULT QUEUE (F1/F0)

A fault condition occurs when the measured temperature

Fault Queue is provided to prevent a false alert due to

environmental noise and requires consecutive fault mea-

surements to trigger the alert function of the TMP101. Table

VII defines the number of measured faults that may be

programmed to trigger an alert condition.

TEMPERATURE

DIGITAL OUTPUT

(

(BINARY)

HEX

128

0111 1111 1111

7FF

127.9375

0111 1111 1111

7FF

100

0110 0100 0000

640

80

0101 0000 0000

500

75

0100 1011 0000

4B0

50

0011 0010 0000

320

25

0001 1001 0000

190

0.25

0000 0000 0100

004

0.0

0000 0000 0000

000

–0.25

1111 1111 1100

FFC

–25

1110 0111 0000

E70

–55

1100 1001 0000

C90

–128

1000 0000 0000

800

TABLE V. Temperature Data Format.

F1

F0

CONSECUTIVE FAULTS

00

1

01

2

10

4

11

6

TABLE VII. Fault Settings of the TMP100 and TMP101.

CONVERSION TIME

R1

R0

RESOLUTION

(typical)

0

0

9 Bits (0.5

°C)

40ms

0

1

10 Bits (0.25

°C)

80ms

1

0

11 Bits (0.125

°C)

160ms

1

1

12 Bits (0.0625

°C)

320ms

TABLE VIII. Resolution of the TMP100 and TMP101.

Byte

D7

D6

D5

D4

D3

D2

D1

D0

1

OS/ALERT

R1

R0

F1

F0

POL

TM

SD

TABLE VI. 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 will

shutdown once the current conversion is completed. For SD

equal to 0, the device will maintain 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 text “HIGH and LOW Limit Registers.”

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.

CONVERTER RESOLUTION (R1/R0)

The Converter Resolution Bits control the resolution of the

internal Analog-to-Digital (A/D) converter. This allows the

user to maximize efficiency by programming for higher reso-

lution or faster conversion time. Table VIII identifies the

Resolution Bits and relationship between resolution and con-

version time.

FIGURE 4. Output Transfer Function Diagrams.

Measured

Temperature

T

HIGH

T

LOW

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