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TMP102AIDRLT Arkusz danych(PDF) 9 Page - Texas Instruments |
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TMP102AIDRLT Arkusz danych(HTML) 9 Page - Texas Instruments |
9 / 30 page TMP102 www.ti.com SBOS397F – AUGUST 2007 – REVISED DECEMBER 2015 Table 3. 13-Bit Temperature Data Format TEMPERATURE (°C) DIGITAL OUTPUT (BINARY) HEX 150 0 1001 0110 0000 0960 128 0 1000 0000 0000 0800 127.9375 0 0111 1111 1111 07FF 100 0 0110 0100 0000 0640 80 0 0101 0000 0000 0500 75 0 0100 1011 0000 04B0 50 0 0011 0010 0000 0320 25 0 0001 1001 0000 0190 0.25 0 0000 0000 0100 0004 0 0 0000 0000 0000 0000 –0.25 1 1111 1111 1100 1FFC –25 1 1110 0111 0000 1E70 –55 1 1100 1001 0000 1C90 7.3.2 Serial Interface The TMP102 device operates as a slave device only on the two-wire bus and SMBus. Connections to the bus are made through the open-drain I/O lines, SDA and SCL. The SDA and SCL pins feature integrated spike suppression filters and Schmitt triggers to minimize the effects of input spikes and bus noise. The TMP102 device supports the transmission protocol for both fast (1 kHz to 400 kHz) and high-speed (1 kHz to 2.85 MHz) modes. All data bytes are transmitted MSB first. 7.3.3 Bus Overview The device that initiates the transfer is called a master, and the devices controlled by the master are called slaves. The bus must be controlled by a master device that generates the serial clock (SCL), controls the bus access, and generates the START and STOP conditions. To address a specific device, a START condition is initiated, indicated by pulling the data-line (SDA) from a high to low logic level when SCL is high. All slaves on the bus shift in the slave address byte on the rising edge of the clock, with the last bit indicating whether a read or write operation is intended. During the ninth clock pulse, the slave being addressed responds to the master by generating an acknowledge and by pulling SDA pin low. A data transfer is then initiated and sent over eight clock pulses followed by an acknowledge bit. During the data transfer the SDA pin must remain stable when SCL is high, because any change in SDA pin when SCL pin is high is interpreted as a START signal or STOP signal. When all data have been transferred, the master generates a STOP condition indicated by pulling SDA pin from low to high, when the SCL pin is high. 7.3.4 Serial Bus Address To communicate with the TMP102, the master must first address slave devices via a slave address byte. The slave address byte consists of seven address bits, and a direction bit indicating the intent of executing a read or write operation. The TMP102 features an address pin to allow up to four devices to be addressed on a single bus. Table 4 describes the pin logic levels used to properly connect up to four devices. Copyright © 2007–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TMP102 |
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