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TMP102AIDRLR Scheda tecnica(PDF) 11 Page - Texas Instruments |
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TMP102AIDRLR Scheda tecnica(HTML) 11 Page - Texas Instruments |
11 / 22 page Device SCL SDA GND V+ ALERT ADD0 C F 10nF ³ R F 5k £ W SupplyVoltage TMP102 www.ti.com SBOS397C – AUGUST 2007 – REVISED OCTOBER 2012 SMBus ALERT FUNCTION HIGH-SPEED (Hs) MODE The TMP102 supports the SMBus Alert function. In order for the two-wire bus to operate at frequencies When the TMP102 operates in Interrupt mode (TM = above 400kHz, the master device must issue an Hs- '1'), the ALERT pin may be connected as an SMBus mode master code (00001xxx) as the first byte after a Alert signal. When a master senses that an ALERT START condition to switch the bus to high-speed condition is present on the ALERT line, the master operation. The TMP102 does not acknowledge this sends an SMBus Alert command (00011001) to the byte, but switches its input filters on SDA and SCL bus. If the ALERT pin is active, the device and its output filters on SDA to operate in Hs-mode, acknowledges the SMBus Alert command and allowing transfers at up to 3.4MHz. After the Hs-mode responds by returning its slave address on the SDA master code has been issued, the master transmits a line. The eighth bit (LSB) of the slave address byte two-wire slave address to initiate a data transfer indicates if the ALERT condition was caused by the operation. The bus continues to operate in Hs-mode temperature exceeding THIGH or falling below TLOW. until a STOP condition occurs on the bus. Upon For POL = '0', this bit is low if the temperature is receiving the STOP condition, the TMP102 switches greater than or equal to THIGH; this bit is high if the the input and output filters back to fast-mode temperature is less than TLOW. The polarity of this bit operation. is inverted if POL = '1'. Refer to Figure 15 for details of this sequence. TIMEOUT FUNCTION 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, NOISE its ALERT pin remains active. The TMP102 is a very low-power device and generates very low noise on the supply bus. Applying GENERAL CALL an RC filter to the V+ pin of the TMP102 can further The TMP102 responds to a two-wire General Call reduce any noise the TMP102 might propagate to address (0000000) if the eighth bit is '0'. The device other components. RF in Figure 11 should be less acknowledges the General Call address and than 5k Ω and CF should be greater than 10nF. responds to commands in the second byte. If the 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 Copyright © 2007–2012, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TMP102 |
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