TMP107

SBOS716B – MAY 2015 – REVISED SEPTEMBER 2015

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7.6.2 Configuration Register (address = 1h) [reset = A000h]

The configuration register is a read and write register used to store bits that control the part operation. The

format and power-up or reset value of the configuration register for the TMP107 is shown in Figure 32 and

Table 5. When the NUS bit is 0, all writes to this register are stored in register logic. When NUS is 1, then all

writes to this register program the EEPROM location that stores the configuration bits. Writes to this location are

followed by a 16-ms wait period for programming the EEPROM. When the configuration register is written, the

current conversion is aborted and new action is taken based on the new written bits. Thus, if the TMP107 is put

into shutdown, the device goes into shutdown immediately. If the conversion rate is changed, any ongoing

conversion is aborted and a new conversion starts with the new conversion rate.

Figure 32. Configuration Register

15

14

13

12

11

10

9

8

CR2

CR1

CR0

OS

SD

FH1

FL1

T1/A1

R/W-5h

R/W-0h

R/W-0h

R-0h

R-0h

R/W-0h

7

6

5

4

3

2

1

0

POL1

FH2

FL2

T2/A2

POL2

Reserved

RST

Reserved

R/W-0h

R-0h

R-0h

R/W-0h

R/W-0h

R-0h

W-0h

R-0h

LEGEND: R/W = Read/Write; R = Read only; W = Write only; -n = value after reset

Table 5. Configuration Register Field Descriptions

Bit

Field

Type

Reset

Description

15-13

CR2-CR0

R/W

5h

Conversion rate.

The conversion rate bits control the update rate of the analog-to-digital converter

(ADC). Table 6 describes the relationship between the values of the conversion rate

bits and the corresponding conversion time and average quiescent current. These

bits only affect continuous-conversion mode and not one-shot mode.

12

OS

R/W

0h

One-shot mode.

0: Default.

1: Starts a single temperature conversion if the SD bit is set to 1. The TMP107

returns to the shutdown state at the completion of the single conversion. When the

configuration register is read, OS always reads zero.

11

SD

R/W

0h

Shutdown mode.

0: The TMP107 is in continuous-conversion mode.

1: The TMP107 is in shutdown mode. Initiate a conversion by writing a 1 to the OS

bit.

10

FH1

R

0h

High limit 1 flag.

0: Indicates that the temperature result does not exceed high limit 1.

1: Indicates when the temperature result exceeds high limit 1.

9

FL1

R

0h

Low limit 1 flag. In therm mode, this bit is not used and always reads 0.

0: In alert mode, this bit indicates that the temperature result is greater than low limit

1.

1: In alert mode, this bit indicates when the temperature result is less than low limit 1.

8

T1/A1

R/W

0h

Alert and therm mode 1.

0: Alert mode: In this mode, the high limit 1 and low limit 1 form a window. If the

temperature result is greater than high limit 1 or less than low limit 1, the respective

flag (either FH1 or FL1) is asserted. After the flag is asserted, clear the flag by

reading the configuration register.

1: Therm mode: In this mode, the limits are used to form an upper limit threshold

detector. If the temperature result is greater than high limit 1, the FH1 flag is

asserted. The FH1 flag is then deasserted only after the temperature drops below

low limit 1. In therm mode, only the FH1 flag is active. The FL1 flag always reads 0.

In this mode, the flags are asserted and deasserted only at the end of a conversion

and cannot be cleared by a configuration register read.

7

POL1

R/W

0h

0: Polarity of the ALERT1 pin is active low.

1: Polarity of the ALERT1 pin is active high.

6

FH2

R

0h

High limit 2 flag.

0: Indicates that the temperature result does not exceed high limit 2.

1: Indicates when the temperature result exceeds high limit 2.

5

FL2

R

0h

Low Limit 2 Flag. In therm mode, this bit is not used and always reads 0.

0: In alert mode, this bit indicates that the temperature result is greater than low limit

2.

1: In alert mode, this bit indicates when the temperature result is less than low limit 2.

24

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