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TMP411-Q1 Datasheet(PDF) 26 Page - Texas Instruments |
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TMP411-Q1 Datasheet(HTML) 26 Page - Texas Instruments |
26 / 40 page ![]() TMP411-Q1 SBOS527F – DECEMBER 2010 – REVISED NOVEMBER 2013 www.ti.com HIGH-SPEED MODE masked. The ALERT/THERM2 pin can also be configured for use as THERM2, a second THERM pin For the two-wire bus to operate at frequencies above (Configuration Register: AL/TH bit = 1). The default 400 kHz, the master device must issue a high-speed setting configures pin 6 to function as ALERT (AL/TH mode (Hs-mode) master code (00001XXX) as the = 0). first byte after a START condition to switch the bus to high-speed operation. The TMP411-Q1 does not The THERM pin asserts low when either the acknowledge this byte, but switches the input filters measured local or remote temperature is outside of on SDA and SCL and the output filter on SDA to the temperature range programmed in the operate in Hs-mode, allowing transfers at up to 3.4 corresponding Local or Remote THERM Limit MHz. After the Hs-mode master code has been Register. The THERM temperature limit range can be issued, the master transmits a two-wire slave address programmed with a wider range than that of the limit to initiate a data transfer operation. The bus registers, which allows ALERT to provide an earlier continues to operate in Hs-mode until a STOP warning than THERM. The THERM alarm resets condition occurs on the bus. Upon receiving the automatically when the measured temperature STOP condition, the TMP411-Q1 switches the input returns to within the THERM temperature limit range and output filters back to fast-mode operation. minus the hysteresis value stored in the THERM Hysteresis Register. The allowable values of TIME-OUT FUNCTION hysteresis are shown in Table 11. The default hysteresis is 10°C. When the ALERT/THERM2 pin is When bit 7 of the Consecutive Alert Register is set configured as a second thermal alarm (Configuration high, the TMP411-Q1 time-out function is enabled. Register: bit 7 = 0, bit 5 = 1), it functions the same as The TMP411-Q1 resets the serial interface if either THERM, but uses the temperatures stored in the SCL or SDA is held low for 30 ms (typical) between a Local/Remote Temperature High/Low Limit Registers START and STOP condition. If the TMP411-Q1 is to set its comparison range. holding the bus low, it releases the bus and waits for a START condition. To avoid activating the time-out When ALERT/THERM2 (pin 6) is configured as function, it is necessary to maintain a communication ALERT (Configuration Register: bit 7 = 0, bit 5 = 0), speed of at least 1 kHz for the SCL operating the pin asserts low when either the measured local or frequency. The default state of the time-out function remote temperature violates the range limit set by the is enabled (bit 7 = high). corresponding Local/Remote Temperature High/Low Limit Registers. This alert function can be configured THERM (PIN 4) AND ALERT/THERM2 (PIN 6) to assert only if the range is violated a specified number of consecutive times (1, 2, 3, or 4). The The TMP411-Q1 has two pins dedicated to alarm consecutive violation limit is set in the Consecutive functions, the THERM and ALERT/THERM2 pins. Alert Register. False alerts that occur as a result of Both pins are open-drain outputs that each require a environmental noise can be prevented by requiring pullup resistor to V+. These pins can be wire-ORed consecutive faults. ALERT also asserts low if the together with other alarm pins for system monitoring remote temperature sensor is open-circuit. When the of multiple sensors. The THERM pin provides a MASK function is enabled (Configuration Register: bit thermal interrupt that cannot be software-disabled. 7 = 1), ALERT is disabled (that is, masked). ALERT The ALERT pin is intended for use as an earlier resets when the master reads the device address, as warning interrupt, and can be software disabled, or long as the condition that caused the alert no longer persists, and the Status Register has been reset. 26 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated Product Folder Links: TMP411-Q1 |
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