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TMP451 Datasheet(PDF) 18 Page - Texas Instruments |
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TMP451 Datasheet(HTML) 18 Page - Texas Instruments |
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18 / 42 page  TMP451 SBOS686A – JUNE 2013 – REVISED DECEMBER 2014 www.ti.com 7.6.1.3 Local Temperature High Byte Register (offset: Read = 00h; Write = N/A) [reset = 00h] Figure 18. Local Temperature High Byte Register 7 6 5 4 3 2 1 0 LT11 LT10 LT9 LT8 LT7 LT6 LT5 LT4 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 LEGEND: R/W = Read/Write; R = Read only; -n = value after reset Table 4. Local Temperature High Byte Register Field Descriptions Bit Field Type Reset Description 7 - 0 LT11 - LT4 R 0h Local temperature high byte. The resolution of the LSB in this register is 1°C. 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. 7.6.1.4 Remote Temperature High Byte Register (offset: Read = 01h; Write = N/A) [reset = 00h] Figure 19. Remote Temperature High Byte Register 7 6 5 4 3 2 1 0 RT11 RT10 RT9 RT8 RT7 RT6 RT5 RT4 R-0h R-0h R-0h R-0h R-0h R-0h R-0h R-0h LEGEND: R/W = Read/Write; R = Read only; -n = value after reset Table 5. Remote Temperature High Byte Register Field Descriptions Bit Field Type Reset Description 7 - 0 RT11 - RT4 R 0h Remote temperature high byte. The resolution of the LSB in this register is 1 °C. 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. 7.6.1.5 Status Register (offset: Read = 02h; Write = N/A) [reset = N/A] Figure 20. Status Register 7 6 5 4 3 2 1 0 BUSY LHIGH LLOW RHIGH RLOW OPEN RTHRM LTHRM R R R R R R R R LEGEND: R/W = Read/Write; R = Read only; -n = value after reset 18 Submit Documentation Feedback Copyright © 2013–2014, Texas Instruments Incorporated Product Folder Links: TMP451 |
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