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LM75B Datasheet(PDF) 7 Page - NXP Semiconductors |
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LM75B Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 29 page LM75B_2 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 02 — 9 December 2008 7 of 29 NXP Semiconductors LM75B Digital temperature sensor and thermal watchdog 7.4.1 Pointer register The Pointer register contains an 8-bit data byte, of which the two LSB bits represent the pointer value of the other four registers, and the other 6 MSB bits are equal to 0, as shown in Table 5 and Table 6. The Pointer register is not accessible to the user, but is used to select the data register for write/read operation by including the pointer data byte in the bus command. Because the Pointer value is latched into the Pointer register when the bus command (which includes the pointer byte) is executed, a read from the LM75B may or may not include the pointer byte in the statement. To read again a register that has been recently read and the pointer has been preset, the pointer byte does not have to be included. To read a register that is different from the one that has been recently read, the pointer byte must be included. However, a write to the LM75B must always include the pointer byte in the statement. The bus communication protocols are described in Section 7.10. At power-up, the Pointer value is equal to 00 and the Temp register is selected; users can then read the Temp data without specifying the pointer byte. 7.4.2 Configuration register The Configuration register (Conf) is a write/read register and contains an 8-bit non-complement data byte that is used to configure the device for different operation conditions. Table 7 shows the bit assignments of this register. Table 5. Pointer register B7 B6 B5 B4 B3 B2 B[1:0] 0 0 0 0 0 0 pointer value Table 6. Pointer value B1 B0 Selected register 0 0 Temperature register (Temp) 0 1 Configuration register (Conf) 1 0 Hysteresis register (Thyst) 1 1 Overtemperature shutdown register (Tos) Table 7. Conf register Legend: * = default value. Bit Symbol Access Value Description B[7:5] reserved R/W 000* reserved for manufacturer’s use; should be kept as zeroes for normal operation B[4:3] OS_F_QUE[1:0] R/W OS fault queue programming 00* queue value = 1 01 queue value = 2 10 queue value = 4 11 queue value = 6 B2 OS_POL R/W OS polarity selection 0* OS active LOW 1 OS active HIGH |
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