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TMP105YZCTG4 Datasheet(PDF) 9 Page - Burr-Brown (TI) |
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TMP105YZCTG4 Datasheet(HTML) 9 Page - Burr-Brown (TI) |
9 / 16 page TMP105 SLLS648B − FEBRUARY 2005 − REVISED JANUARY 2006 www.ti.com 9 SLAVE MODE OPERATIONS The TMP105 can operate as a slave receiver or slave transmitter. Slave Receiver Mode: The first byte transmitted by the master is the slave address, with the R/W bit LOW. The TMP105 then acknowledges reception of a valid address. The next byte transmitted by the master is the Pointer Register. The TMP105 then acknowledges reception of the Pointer Register byte. The next byte or bytes are written to the register addressed by the Pointer Register. The TMP105 acknowledges reception of each data byte. The master may terminate data transfer by generating a START or STOP condition. Slave Transmitter Mode: The first byte is transmitted by the master and is the slave address, with the R/W bit HIGH. The slave acknowledges reception of a valid slave address. The next byte is transmitted by the slave and is the most significant byte of the register indicated by the Pointer Register. The master acknowledges reception of the data byte. The next byte transmitted by the slave is the least significant byte. The master acknowledges reception of the data byte. The master may terminate data transfer by generating a Not-Acknowledge on reception of any data byte, or generating a START or STOP condition. SMBus ALERT FUNCTION The TMP105 supports the SMBus Alert function. When the TMP105 is operating in Interrupt Mode (TM = 1), the ALERT pin of the TMP105 may be connected as an SMBus Alert signal. When a master senses that an ALERT condition is present on the ALERT line, the master sends an SMBus Alert command (00011001) on the bus. If the ALERT pin of the TMP105 is active, the devices will acknowledge the SMBus Alert command and respond by returning its slave address on the SDA line. The eighth bit (LSB) of the slave address byte will indicate if the temperature exceeding THIGH or falling below TLOW caused the ALERT condition. This bit will be HIGH if the temperature is greater than or equal to THIGH. This bit will be LOW if the temperature is less than TLOW. Refer to Figure 7 for details of this sequence. If multiple devices on the bus respond to the SMBus Alert command, arbitration during the slave address portion of the SMBus Alert command will determine which device will clear its ALERT status. If the TMP105 wins the arbitration, its ALERT pin will become inactive at the completion of the SMBus Alert command. If the TMP105 loses the arbitration, its ALERT pin will remain active. GENERAL CALL The TMP105 responds to a Two-Wire General Call address (0000000) if the eighth bit is 0. The device will acknowledge the General Call address and respond to commands in the second byte. If the second byte is 00000100, the TMP105 will latch the status of the address pin, but will not reset. If the second byte is 00000110, the TMP105 will latch the status of the address pin and reset the internal registers to their power-up values. TIMEOUT FUNCTION The TMP105 will reset the serial interface if either SCL or SDA are held LOW for 54ms (typ) between a START and STOP condition. The TMP105 will release the bus if it is pulled LOW and will wait for a START condition. To avoid activating the timeout function, it is necessary to maintain a communication speed of at least 1kHz for SCL operating frequency. |
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