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TMP122-EP Datasheet(PDF) 9 Page - Texas Instruments |
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TMP122-EP Datasheet(HTML) 9 Page - Texas Instruments |
9 / 17 page THERMOSTAT MODE (TM1/TM0) POLARITY (POL) FAULT QUEUE (F1/F0) TMP122-EP www.ti.com .......................................................................................................................................................................................... SBOS454 – NOVEMBER 2008 The Thermostat Mode bits of the TMP122 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 7. Power on default is comparator mode. Table 7. Mode Settings TM1 TM0 MODE OF OPERATION 0 0 Comparator mode 0 1 Interrupt mode 1 0 Interrupt comparator mode 1 1 Reserved The Polarity Bit of the TMP122 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. Figure 8. ALERT Output Transfer Function Diagrams 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 measurements to trigger the alert function of the TMP122. Table 8 defines the number of consecutive faults required to trigger a consecutive alert condition. Power-on default for F1/F0 is 0/0. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): TMP122-EP |
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