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NXP Semiconductors
LM75B
Digital temperature sensor and thermal watchdog
NXP B.V. 2008.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
Date of release: 9 December 2008
Document identifier: LM75B_2
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
19. Contents
1
2
3
4
5
6
6.1
6.2
7
7.1
7.2
7.2.1
7.3
7.4
7.4.1
7.4.2
7.4.3
7.4.4
General description. . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ordering information. . . . . . . . . . . . . . . . . . . . . 2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pinning information. . . . . . . . . . . . . . . . . . . . . . 3
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4
Functional description . . . . . . . . . . . . . . . . . . . 4
General operation. . . . . . . . . . . . . . . . . . . . . . . 4
I
2
C-bus serial interface . . . . . . . . . . . . . . . . . . . 6
Bus fault time-out . . . . . . . . . . . . . . . . . . . . . . . 6
Slave address. . . . . . . . . . . . . . . . . . . . . . . . . . 6
Register list. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pointer register . . . . . . . . . . . . . . . . . . . . . . . . . 7
Configuration register . . . . . . . . . . . . . . . . . . . . 7
Temperature register. . . . . . . . . . . . . . . . . . . . . 8
Overtemperature shutdown threshold (Tos)
and hysteresis (Thyst) registers . . . . . . . . . . . . 9
OS output and polarity . . . . . . . . . . . . . . . . . . 10
OS comparator and interrupt modes . . . . . . . 10
OS fault queue . . . . . . . . . . . . . . . . . . . . . . . . 11
Shutdown mode . . . . . . . . . . . . . . . . . . . . . . . 11
Power-up default and power-on reset. . . . . . . 11
Protocols for writing and reading the registers 12
Application design-in information . . . . . . . . . 15
Typical application. . . . . . . . . . . . . . . . . . . . . . 15
LM75A and LM75B comparison . . . . . . . . . . . 15
Temperature accuracy . . . . . . . . . . . . . . . . . . 16
Noise effect. . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 17
Recommended operating conditions. . . . . . . 17
Static characteristics. . . . . . . . . . . . . . . . . . . . 18
Dynamic characteristics . . . . . . . . . . . . . . . . . 20
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 21
Soldering of SMD packages . . . . . . . . . . . . . . 24
Introduction to soldering . . . . . . . . . . . . . . . . . 24
Wave and reflow soldering . . . . . . . . . . . . . . . 24
Wave soldering. . . . . . . . . . . . . . . . . . . . . . . . 24
Reflow soldering. . . . . . . . . . . . . . . . . . . . . . . 25
Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . 26
Revision history. . . . . . . . . . . . . . . . . . . . . . . . 27
Legal information. . . . . . . . . . . . . . . . . . . . . . . 28
Data sheet status . . . . . . . . . . . . . . . . . . . . . . 28
Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.5
7.6
7.7
7.8
7.9
7.10
8
8.1
8.2
8.3
8.4
9
10
11
12
13
14
14.1
14.2
14.3
14.4
15
16
17
17.1
17.2
17.3
17.4
18
19
Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Contact information . . . . . . . . . . . . . . . . . . . . 28
Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29