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TMP102AIDRLR Folha de dados(PDF) 11 Page - Burr-Brown (TI) |
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TMP102AIDRLR Folha de dados(HTML) 11 Page - Burr-Brown (TI) |
11 / 19 page www.ti.com SMBus ALERT FUNCTION HIGH-SPEED (Hs) MODE TIMEOUT FUNCTION NOISE GENERAL CALL TMP102 SCL SDA GND V+ ALERT ADD0 C F 10nF ³ R F 5k £ W SupplyVoltage TMP102 SBOS397 – AUGUST 2007 The TMP102 supports the SMBus Alert function. In order for the two-wire bus to operate at When the TMP102 operates in Interrupt mode (TM = frequencies above 400kHz, the master device must '1'), the ALERT pin may be connected as an SMBus issue an Hs-mode master code (00001xxx) as the Alert signal. When a master senses that an ALERT first byte after a START condition to switch the bus condition is present on the ALERT line, the master to high-speed operation. The TMP102 does not sends an SMBus Alert command (00011001) to the acknowledge this byte, but switches its input filters bus. If the ALERT pin is active, the device on SDA and SCL and its output filters on SDA to acknowledges the SMBus Alert command and operate in Hs-mode, allowing transfers at up to responds by returning its slave address on the SDA 3.4MHz. After the Hs-mode master code has been line. The eighth bit (LSB) of the slave address byte issued, the master transmits a two-wire slave indicates if the ALERT condition was caused by the address to initiate a data transfer operation. The bus temperature exceeding THIGH or falling below TLOW. continues to operate in Hs-mode until a STOP For POL = '0', this bit is low if the temperature is condition occurs on the bus. Upon receiving the greater than or equal to THIGH; this bit is high if the STOP condition, the TMP102 switches the input and temperature is less than TLOW. The polarity of this bit output filters back to fast-mode operation. is inverted if POL = '1'. Refer to Figure 15 for details of this sequence. If multiple devices on the bus respond to the SMBus The TMP102 resets the serial interface if SCL is held Alert command, arbitration during the slave address low for 30ms (typ). The TMP102 releases the bus if it portion of the SMBus Alert command determines is pulled low and waits for a START condition. To which device will clear its ALERT status. The device avoid activating the timeout function, it is necessary with the lowest two-wire address wins the arbitration. to maintain a communication speed of at least 1kHz If the TMP102 wins the arbitration, its ALERT pin for SCL operating frequency. becomes inactive at the completion of the SMBus Alert command. If the TMP102 loses the arbitration, its ALERT pin remains active. The TMP102 is a very low-power device and generates very low noise on the supply bus. Applying an RC filter to the V+ pin of the TMP102 The TMP102 responds to a two-wire General Call can further reduce any noise the TMP102 might address (0000000) if the eighth bit is '0'. The device propagate to other components. RF in Figure 11 acknowledges the General Call address and should be less than 5k Ω and C F should be greater responds to commands in the second byte. If the than 10nF. second byte is 00000110, the TMP102 internal registers are reset to power-up values. The TMP102 does not support the General Address acquire command. Figure 11. Noise Reduction 11 Submit Documentation Feedback |
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