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LM75AD Datasheet(PDF) 10 Page - NXP Semiconductors |
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LM75AD Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 18 page ![]() Philips Semiconductors Product data sheet LM75A Digital temperature sensor and thermal Watchdog ™ 2004 Oct 05 10 Overtemp shut-down threshold (Tos) and hysteresis (Thyst) registers These two registers are write/read registers, and also called set-point registers. They are used to store the user-defined temperature limits, called overtemp shut-down threshold (Tos) and hysteresis (Thyst), for the device Watchdog operation. At the end of each conversion the Temp data will be compared with the data stored in these two registers in order to set the state of the device OS output accordingly as described in the “General operation” section. Each of the set-point registers contains two 8-bit data bytes consisting of one MS data byte and one LS data byte the same as the Temp register. However, only 9 bits of the two bytes are used to store the set-point data in 2’s complement format with the resolution of 0.5 °C. The Tos register table (Table 8) and Thyst register table (Table 9) show the bit arrangement of the Tos data and Thyst data in the data bytes. Notice that because only 9-bit data are used in the set-point registers, the device uses only the 9 MSB bits of the Temp data for data comparison. Table 8. Tos register table Tos MS byte Tos LS byte MSB LSB MSB LSB B7 B6 B5 B4 B3 B2 B1 B0 B7 B6 B5 B4 B3 B2 B1 B0 Tos data (9 bits) Not used MSB LSB D8 D7 D6 D5 D4 D3 D2 D1 D0 X X X X X X X Table 9. Thyst register table Thyst MS byte Thyst LS byte MSB LSB MSB LSB B7 B6 B5 B4 B3 B2 B1 B0 B7 B6 B5 B4 B3 B2 B1 B0 Thyst data (9 bits) Not used MSB LSB D8 D7 D6 D5 D4 D3 D2 D1 D0 X X X X X X X When a set-point register is read, all 16 bits are provided to the bus and must be collected by the controller to complete the bus operation. However, only the 9 significant bits should be used and the 7 LSB bits of the LS byte are equal to zero and should be ignored. The Tos and Thyst table (Table 10) shows examples of the limit data and value. Table 10. Tos and Thyst table Limit data Limit temp value 11–bit Binary (2’s complement) 3-bit Hex Decimal value °C 0111 1101 0 0FAh 250 +125.0 °C 0001 1001 0 032h 50 +25.0 °C 0000 0000 1 001h 1 +0.5 °C 0000 0000 0 000h 0 0.0 °C 1111 1111 1 1FFh –1 –0.5 °C 1110 0111 0 1CEh –50 –25.0 °C 1100 1001 0 192h –110 –55.0 °C |
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