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TMP102 Datasheet(PDF) 11 Page - Texas Instruments |
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TMP102 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 19 page 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 www.ti.com ............................................................................................................................................... SBOS397B – AUGUST 2007 – REVISED OCTOBER 2008 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 '1'), the ALERT pin may be connected as an SMBus Hs-mode master code (00001xxx) as the first byte Alert signal. When a master senses that an ALERT after a START condition to switch the bus to condition is present on the ALERT line, the master high-speed operation. The TMP102 does not sends an SMBus Alert command (00011001) to the acknowledge this byte, but switches its input filters on bus. If the ALERT pin is active, the device SDA and SCL and its output filters on SDA to operate acknowledges the SMBus Alert command and in Hs-mode, allowing transfers at up to 3.4MHz. After responds by returning its slave address on the SDA the Hs-mode master code has been issued, the line. The eighth bit (LSB) of the slave address byte master transmits a two-wire slave address to initiate a indicates if the ALERT condition was caused by the data transfer operation. The bus continues to operate temperature exceeding THIGH or falling below TLOW. in Hs-mode until a STOP condition occurs on the bus. For POL = '0', this bit is low if the temperature is Upon receiving the STOP condition, the TMP102 greater than or equal to THIGH; this bit is high if the switches the input and output filters back to temperature is less than TLOW. The polarity of this bit 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 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 © 2007–2008, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TMP102 |
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