TMP451

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SBOS686A – JUNE 2013 – REVISED DECEMBER 2014

The remaining bits of the configuration register are reserved and must always be set to 0. The power-on reset

value for this register is 00h.

7.6.1.7 Conversion Rate Register (offset: Read = 04h; Write = 0Ah) [reset = 08h]

Figure 22. Conversion Rate Register

7

6

5

4

3

2

1

0

RESERVED

CR3

CR2

CR1

CR0

R/W-0h

R/W-1h

R/W-0h

R/W-0h

R/W-0h

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

Table 8. Conversion Rate Register Field Descriptions

Bit

Field

Type

Reset

Description

3 - 0

CR3 - CR0

R/W

8h

Conversion rate selection. Refer to Table 9

The conversion rate register (read address 04h, write address 0Ah) controls the rate at which temperature

conversions are performed. This register adjusts the idle time between conversions but not the conversion time

itself, thereby allowing the TMP451 power dissipation to be balanced with the temperature register update rate.

Table 9 lists the conversion rate options and corresponding time between conversions. The default value of the

register is 08h, which gives a default rate of 16 conversions per second.

Table 9. Conversion Rate

VALUE

CONVERSIONS PER SECOND

TIME (SECONDS)

00h

0.0625

16

01h

0.125

8

02h

0.25

4

03h

0.5

2

04h

1

1

05h

2

0.5

06h

4

0.25

07h

8

0.125

08h

16 (default)

0.0625 (default)

09h

32

0.03125

7.6.1.8 Local Temperature High Limit Register (offset: Read = 05h; Write = 0Bh) [reset = 55h]

Figure 23. Local Temperature High Limit Register

7

6

5

4

3

2

1

0

LTHL11

LTHL10

LTHL9

LTHL8

LTHL7

LTHL6

LTHL5

LTHL4

R/W-0h

R/W-1h

R/W-0h

R/W-1h

R/W-0h

R/W-1h

R/W-0h

R/W-1h

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

Table 10. Local Temperature High Limit Register Field Descriptions

Bit

Field

Type

Reset

Description

7 - 0

LTHL11 - LTHL4

R/W

55h

These bits determine the value of the high temperature limit to

which the local temperature measurement is compared. The

resolution of the LSB in this register is 1°C.

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