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TMP451 Datenblatt(PDF) 21 Page - Texas Instruments

Teilenummer TMP451
Bauteilbeschribung  TMP451 ±1°C Remote and Local Temperature Sensor With η-Factor and Offset Correction, Series-Resistance Cancellation, and Programmable Digital Filter
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TMP451 Datenblatt(HTML) 21 Page - Texas Instruments

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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.
Copyright © 2013–2014, Texas Instruments Incorporated
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