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TMP104YFFR Datasheet(PDF) 9 Page - Texas Instruments |
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TMP104YFFR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 24 page TMP104 www.ti.com SBOS564A – NOVEMBER 2011 – REVISED NOVEMBER 2011 GLOBAL READ AND WRITE The host can initiate a global read or write command to all TMP104s in the daisy-chain by sending the read/write command, consisting of P7-P3 = 11110. P2-P1 indicate the data register pointer, as shown in Table 3, and P0 indicates read/write control. P0 = 0 indicates a global write command. The host must transfer one more byte of data for the register (indicated by bits P2-P1), and every TMP104 in the daisy-chain updates the appropriate register. P0 = 1 indicates a global read command. The TMP104 with the device ID of '0000' then breaks the bus connection, transmits the data from the register indicated by bits P2-P1, and then reconnects the bus. The TMP104 with the device ID of '0001' then repeats the same sequence, followed by the rest of the TMP104 devices in the daisy-chain. Table 3. Pointer Addresses P0 P0 REGISTER 0 0 Temperature register (read-only) 0 1 Configuration register (read/write) 1 0 TLOW register (read/write) 1 1 THIGH register (read/write) GLOBAL CLEAR INTERRUPT The host can initiate a global clear interrupt command (P7-P0 = 10101001) to all TMP104s in the daisy-chain. Upon receiving this command, the TMP104 disables future interrupts (D7 in the Configuration Register is set to '0'). If a TMP104 has previously broken the bus connection and sent an interrupt (logic low on the bus), it now stops holding the bus low. The device sends the baud rate calibration command and clear interrupt command to the next TMP104 in the chain, and then reconnects the bus. In the case of multiple devices having active interrupts, the clear interrupt command propagates through the daisy-chain, disables all interrupts, and reconnects the bus across all devices. GLOBAL SOFTWARE RESET The host can initiate a global software reset command (P7-P0 = 10110100) to all TMP104s in the daisy-chain. Upon receiving this command, the TMP104 resets its internal registers except for the device ID, which is not reset, and reconnects the bus. If the bus is broken before the initiation of this command, all TMP104s before the broken bus point receive the command. If the host intends to initiate a global software reset across all TMP104s in the chain, this command must be transmitted multiple times until it echoes back to the host. Copyright © 2011, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): TMP104 |
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