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TMP411-Q1 Datasheet(PDF) 16 Page - Texas Instruments |
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TMP411-Q1 Datasheet(HTML) 16 Page - Texas Instruments |
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16 / 40 page  TMP411-Q1 SBOS527F – DECEMBER 2010 – REVISED NOVEMBER 2013 www.ti.com STATUS REGISTER The RHIGH bit reads as 1 if the remote temperature has exceeded the remote high limit and remains The TMP411-Q1 has a Status Register to report the greater than the remote high limit less the value in state of the temperature comparators. Table 5 shows the Hysteresis Register. The LLOW and RLOW bits the Status Register bits. The Status Register is read- are not affected by the AL/TH bit. only and is read by reading from pointer address 02h. The LLOW bit reads as 1 if the local low limit was The BUSY bit reads as 1 if the ADC is making a exceeded since the last clearing of the Status conversion. It reads as 0 if the ADC is not converting. Register. The RLOW bit reads as 1 if the remote low The OPEN bit reads as 1 if the remote transistor was limit was exceeded since the last clearing of the detected as open since the last read of the Status Status Register. Register. The OPEN status is only detected when the The values of the LLOW, RLOW, and OPEN (as well ADC is attempting to convert a remote temperature. as LHIGH and RHIGH when AL/TH is 0) are latched The RTHRM bit reads as 1 if the remote temperature and read as 1 until the Status Register is read or a has exceeded the remote THERM limit and remains device reset occurs. These bits are cleared by greater than the remote THERM limit less the value in reading the Status Register, provided that the the shared Hysteresis Register; see Figure 18. condition causing the flag to be set no longer exists. The values of BUSY, LTHRM, and RTHRM (as well The LTHRM bit reads as 1 if the local temperature as LHIGH and RHIGH when ALERT/THERM2 is 1) has exceeded the local THERM limit and remains are not latched and are not cleared by reading the greater than the local THERM limit less the value in Status Register. They always indicate the current the shared Hysteresis Register; see Figure 18. state, and are updated appropriately at the end of the corresponding ADC conversion. Clearing the Status The LHIGH and RHIGH bit values depend on the Register bits does not clear the state of the ALERT state of the AL/TH bit in the Configuration Register. If pin; an SMBus alert response address command the AL/TH bit is 0, the LHIGH bit reads as 1 if the must be used to clear the ALERT pin. local high limit was exceeded since the last clearing of the Status Register. The RHIGH bit reads as 1 if The TMP411-Q1 NORs LHIGH, LLOW, RHIGH, the remote high limit was exceeded since the last RLOW, and OPEN, so a status change for any of clearing of the Status Register. If the AL/TH bit is 1, these flags from 0 to 1 automatically causes the the remote high limit and the local high limit are used ALERT pin to go low (only applies when the to implement a THERM2 function. LHIGH reads as 1 ALERT/THERM2 pin is configured for ALERT mode). if the local temperature has exceeded the local high limit and remains greater than the local high limit less the value in the Hysteresis Register. Table 5. Status Register Format STATUS REGISTER (Read = 02h, Write = NA) BIT # D7 D6 D5 D4 D3 D2 D1 D0 BIT NAME BUSY LHIGH LLOW RHIGH RLOW OPEN RTHRM LTHRM POR VALUE 0(1) 0 0 0 0 0 0 0 (1) The BUSY bit changes to 1 almost immediately (<<100 μs) following power up, as the TMP411-Q1 begins the first temperature conversion. The BUSY bit is high whenever the TMP411-Q1 is converting a temperature reading. 16 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated Product Folder Links: TMP411-Q1 |
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