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TMP451 Datasheet(PDF) 25 Page - Texas Instruments |
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TMP451 Datasheet(HTML) 25 Page - Texas Instruments |
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25 / 42 page  TMP451 www.ti.com SBOS686A – JUNE 2013 – REVISED DECEMBER 2014 7.6.1.18 Local Temperature Low Byte Register (offset: Read = 15h; Write = N/A) [reset = 00h] Figure 33. Local Temperature Low Byte Register 7 6 5 4 3 2 1 0 LT3 LT2 TL1 LT0 RESERVED R-0h R-0h R-0h R-0h R-0h LEGEND: R/W = Read/Write; R = Read only; -n = value after reset Table 20. Local Temperature Low Byte Register Field Descriptions Bit Field Type Reset Description 7 - 0 LT3 - LT0 R 0h Local temperature low byte. The resolution of the four bits in this register is 0.0625C. This register is read-only and is updated by the ADC each time a temperature measurement is completed. When the full temperature value is needed, reading the high byte register first causes the low byte register value to be locked (the ADC does not write to it) until it is read. The same thing happens upon reading the low byte register value first (the high byte register value is locked until it is read). This mechanism assures that both bytes of the read operation are from the same ADC conversion. This assurance remains valid only until another register is read. For proper operation, read the high byte of the temperature result first. Read the low byte register in the next read command; if the low byte is not needed, the register may be left unread. 7.6.1.19 Remote Temperature THERM Limit Register (offset: Read = 19h; Write = 19h) [reset = 6C] Figure 34. Remote Temperature THERM Limit Register 7 6 5 4 3 2 1 0 RTH11 RTH10 RTH9 RTH8 RTH7 RTH6 RTH5 RTH4 R/W-0h R/W-1h R/W-1h R/W-0h R/W-1h R/W-1h R/W-0h R/W-0h LEGEND: R/W = Read/Write; R = Read only; -n = value after reset Table 21. Remote Temperature THERM Limit Register Field Descriptions Bit Field Type Reset Description 7 - 0 RTH11 - RTH4 R/W 6Ch Remote temperature THERM limit. These bits determine the value of the THERM limit to which the remote temperature measurement is compared. The resolution of the LSB in this register is 1 °C. 7.6.1.20 Local Temperature THERM Limit Register (offset: Read = 20h; Write = 20h) [reset = 55] Figure 35. Local Temperature THERM Limit Register 7 6 5 4 3 2 1 0 LTH11 LTH10 LTH9 LTH8 LTH7 LTH6 LTH5 LTH4 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 22. Local Temperature THERM Limit Register Field Descriptions Bit Field Type Reset Description 7 - 0 LTH11 - LTH4 R/W 55h Local temperature THERM limit. These bits determine the value of the THERM 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 Submit Documentation Feedback 25 Product Folder Links: TMP451 |
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