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TMP122AIDBVR Scheda tecnica(PDF) 8 Page - Texas Instruments |
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TMP122AIDBVR Scheda tecnica(HTML) 8 Page - Texas Instruments |
8 / 19 page TMP122, TMP124 8 SBOS272B www.ti.com F1 F0 CONSECUTIVE FAULTS 00 1 01 2 10 4 11 6 TABLE VIII. Fault Settings of the TMP122 and TMP124. THERMOSTAT MODE (TM1/TM0) The Thermostat Mode bits of the TMP122/TMP124 indicate to the device whether to operate in Comparator Mode, Interrupt Mode or Interrupt Comparator Mode. For more information on Comparator and Interrupt Mode, see text HIGH and LOW limit registers. The bit assignments for thermostat mode are described in Table VII. Power on default is comparator mode. POLARITY (POL) The Polarity Bit of the TMP122/TMP124 adjusts the polarity of the ALERT pin output. By default, POL = 0 and the ALERT pin will be active LOW, as shown in Figure 8. For POL = 1 the ALERT Pin will be active HIGH, and the state of the ALERT Pin is inverted. FAULT QUEUE (F1/F0) A fault condition occurs when the measured temperature exceeds the limits set in the THIGH and TLOW registers. The Fault Queue is provided to prevent a false alert due to environmental noise and requires consecutive fault mea- surements to trigger the alert function of the TMP122/TMP124. Table VIII defines the number of consecutive faults required to trigger a consecutive alert condition. Power-on default for F1/F0 is 0/0. HIGH AND LOW LIMIT REGISTERS In Comparator Mode (TM1/TM0 = 0/0), the ALERT Pin of the TMP122/TMP124 becomes active when the temperature equals or exceeds the value in THIGH and generates a consecutive number of faults according to fault bits F1 and F0. The ALERT pin will remain active until the temperature falls below the indicated TLOW value for the same number of faults. In Interrupt Mode (TM1/TM0 = 0/1) the ALERT pin becomes active when the temperature equals or exceeds THIGH for a consecutive number of fault conditions. The ALERT pin remains active until a read operation of any register occurs. The ALERT pin will also be cleared if the device is placed in Shutdown Mode. Once the ALERT pin is cleared, it will only become active again by the temperature falling below TLOW. When the temperature falls below TLOW, the ALERT pin becomes active and remains active until cleared by a read operation of any register. Once the ALERT pin is cleared, the above cycle will repeat with the ALERT pin becoming active when the temperature equals or exceeds THIGH. In Interrupt/Comparator Mode (TM1/TM0 = 1/0), the ALERT Pin of the TMP122/TMP124 becomes active when the tem- perature equals or exceeds the value in THIGH and generates a consecutive number of faults according to fault bits F1 and F0. The ALERT pin will remain active until the temperature falls below the indicated TLOW value for the same number of faults and a communication with the device has occurred after that point. Operational modes are represented in Figure 8. Tables IX and X describe the format for the THIGH and TLOW registers. Power-up reset values for THIGH and TLOW are: THIGH = 80°C and TLOW = 75°C. The format of the data for THIGH and TLOW is the same as for the Temperature Register. All 13 bits for the Temperature, THIGH, and TLOW registers are used in the comparisons for the ALERT function for all con- verter resolutions. The three LSBs in THIGH and TLOW can affect the ALERT output even if the converter is configured for 9-bit resolution. D15 D14 D13 D12 D11 D10 D9 D8 H12 H11 H10 H9 H8 H7 H6 H5 D7 D6 D5 D4 D3 D2 D1 D0 H4 H3 H2 H1 H0 1 1 0 TABLE IX. THIGH Register. D15 D14 D13 D12 D11 D10 D9 D8 L12 L11 L10 L9 L8 L7 L6 L5 D7 D6 D5 D4 D3 D2 D1 D0 L4 L3 L2 L1 L0 1 0 0 TABLE X. TLOW Register. TM1 TM0 MODE OF OPERATION 0 0 Comparator Mode 0 1 Interrupt Mode 1 0 Interrupt Comparator Mode 11 — TABLE VII. Mode Settings of the TMP122. FIGURE 8. ALERT Output Transfer Function Diagrams. Measured Temperature T HIGH T LOW TMP122/124 ALERT PIN (Comparator Mode) POL = 0 TMP122/124 ALERT PIN (Interrupt Mode) POL = 0 TMP122/124 ALERT PIN (Interrupt/Comparator Mode) POL = 0 Read Read Time Read |
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