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TMP400 Datasheet(PDF) 17 Page - Texas Instruments |
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TMP400 Datasheet(HTML) 17 Page - Texas Instruments |
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17 / 25 page  www.ti.com HIGH-SPEED MODE ALERT (PIN 11) TIMEOUT FUNCTION STBY (PIN 15) Measured Temperature ALERTHighLimit ALERTLowLimitHysteresis ALERT SMBusALERT Read Read Time Read TMP400 SBOS404 – DECEMBER 2007 In order for the Two-Wire bus to operate at The ALERT pin of the TMP400 is dedicated to alarm frequencies above 400kHz, the master device must functions. This pin has an open-drain output that issue a High-speed mode (Hs-mode) master code requires a pull-up resistor to V+. It can be wire-ORed (00001XXX) as the first byte after a START condition together with other alarm pins for system monitoring to switch the bus to high-speed operation. The of multiple sensors. The ALERT pin is intended for TMP400 does not acknowledge this byte, but use as an earlier warning interrupt, and can be switches the input filters on SDA and SCL and the software disabled, or masked. output filter on SDA to operate in Hs-mode, allowing The ALERT pin (pin 11) asserts low when either the transfers at up to 3.4MHz. After the Hs-mode master measured local or remote temperature violates the code has been issued, the master transmits a range limit set by the corresponding Local/Remote Two-Wire slave address to initiate a data transfer Temperature High/Low Limit Registers. This alert operation. The bus continues to operate in Hs-mode function can be configured to assert only if the range until a STOP condition occurs on the bus. Upon is violated a specified number of consecutive times receiving the STOP condition, the TMP400 switches (1, 2, 3, or 4). The consecutive violation limit is set in the input and output filter back to fast-mode the Consecutive Alert Register. False alerts that operation. 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 When bit 7 of the Consecutive Alert Register is set (Configuration Register: bit 7 = 1), ALERT is disabled high, the TMP400 timeout function is enabled. The (that is, masked). ALERT resets when the master TMP400 resets the serial interface if either SCL or reads the device address, as long as the condition SDA are held low for 30ms (typical) between a that caused the alert no longer persists, and the START and STOP condition. If the TMP400 is Status Register has been reset. 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 The TMP400 features a standby pin (STBY) that, frequency. The default state of the timeout function is when pulled low, disables the device. During normal enabled (bit 7 = high). operation STBY should be tied high (V+). When STBY is pulled low, the TMP400 is immediately disabled. If the TMP400 receives a One-Shot command when STBY is pulled low, the command is ignored and the TMP400 continues to be disabled until STBY is pulled high. Figure 18. SMBus Alert Timing Diagram Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 17 Product Folder Link(s): TMP400 |
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