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TMP411 Datasheet(PDF) 19 Page - Burr-Brown (TI) |
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TMP411 Datasheet(HTML) 19 Page - Burr-Brown (TI) |
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19 / 28 page  TMP411 SBOS383A − FEBRUARY 2007 www.ti.com 19 HIGH-SPEED MODE In order for the Two-Wire bus to operate at frequencies above 400kHz, the master device must issue a High-speed mode (Hs-mode) master code (00001XXX) as the first byte after a START condition to switch the bus to high-speed operation. The TMP411 will not acknowledge this byte, but will switch the input filters on SDA and SCL and the output filter on SDA to operate in Hs-mode, allowing transfers at up to 3.4MHz. After the Hs-mode master code has been issued, the master transmits a Two-Wire slave address to initiate a data transfer operation. The bus continues to operate in Hs-mode until a STOP condition occurs on the bus. Upon receiving the STOP condition, the TMP411 switches the input and output filter back to fast-mode operation. TIMEOUT FUNCTION When bit 7 of the Consecutive Alert Register is set high, the TMP411 timeout function is enabled. The TMP411 resets the serial interface if either SCL or SDA are held low for 30ms (typical) between a START and STOP condition. If the TMP411 is holding the bus low, it releases the bus and waits for a START condition. To avoid activating the timeout function, it is necessary to maintain a communication speed of at least 1kHz for the SCL operating frequency. The default state of the timeout function is enabled (bit 7 = high). THERM (PIN 4) AND ALERT/THERM2 (PIN 6) The TMP411 has two pins dedicated to alarm functions, the THERM and ALERT/THERM2 pins. Both pins are open-drain outputs that each require a pull-up resistor to V+. These pins can be wire-ORed together with other alarm pins for system monitoring of multiple sensors. The THERM pin provides a thermal interrupt that cannot be software disabled. The ALERT pin is intended for use as an earlier warning interrupt, and can be software disabled, or masked. The ALERT/THERM2 pin can also be configured for use as THERM2, a second THERM pin (Configuration Register: AL/TH bit = 1). The default setting configures pin 6 to function as ALERT (AL/TH = 0). The THERM pin asserts low when either the measured local or remote temperature is outside of the temperature range programmed in the corresponding Local/Remote THERM Limit Register. The THERM temperature limit range can be programmed with a wider range than that of the limit registers, which allows ALERT to provide an earlier warning than THERM. The THERM alarm resets automatically when the measured temperature returns to within the THERM temperature limit range minus the hysteresis value stored in the THERM Hysteresis Register. The allowable values of hysteresis are shown in Table 10. The default hysteresis is 10 °C. When the ALERT/THERM2 pin is configured as a second thermal alarm (Configuration Register: bit 7 = 0, bit 5 = 1), it functions the same as THERM, but uses the temperatures stored in the Local/Remote Temperature High/Low Limit Registers to set its comparison range. When ALERT/THERM2 (pin 6) is configured as ALERT (Configuration Register: bit 7 = 0, bit 5 = 0), the pin asserts low when either the measured local or remote temperature violates the range limit set by the corresponding Local/Remote Temperature High/Low Limit Registers. This alert function can be configured to assert only if the range is violated a specified number of consecutive times (1, 2, 3, or 4). The consecutive violation limit is set in the Consecutive Alert Register. False alerts that occur as a result of environmental noise can be prevented by requiring consecutive faults. ALERT also asserts low if the remote temperature sensor is open-circuit. When the MASK function is enabled (Configuration Register: bit 7 = 1), ALERT is disabled (that is, masked). ALERT resets when the master reads the device address, as long as the condition that caused the alert no longer persists, and the Status Register has been reset. Measured Temperature THERM Limit and ALERT High Limit ALERT Low Limit and THERM Limit Hysteresis THERM ALERT SMBus ALERT Read Read Time Read Figure 17. SMBus Alert Timing Diagram |
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