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LM95241CIMM Datasheet(PDF) 12 Page - National Semiconductor (TI) |
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LM95241CIMM Datasheet(HTML) 12 Page - National Semiconductor (TI) |
12 / 19 page 1.0 Functional Description (Continued) 1.8 SERIAL INTERFACE RESET In the event that the SMBus Master is RESET while the LM95241 is transmitting on the SMBDAT line, the LM95241 must be returned to a known state in the communication protocol. This may be done in one of two ways: 1. When SMBDAT is LOW, the LM95241 SMBus state machine resets to the SMBus idle state if either SMB- DAT or SMBCLK are held low for more than 35ms (t TIMEOUT). Note that according to SMBus specification 2.0 all devices are to timeout when either the SMBCLK or SMBDAT lines are held low for 25-35ms. Therefore, to insure a timeout of all devices on the bus the SMBCLK or SMBDAT lines must be held low for at least 35ms. 2. When SMBDAT is HIGH, have the master initiate an SMBus start. The LM95241 will respond properly to an SMBus start condition at any point during the communi- cation. After the start the LM95241 will expect an SMBus Address address byte. 1.9 ONE-SHOT CONVERSION The One-Shot register is used to initiate a single conversion and comparison cycle when the device is in standby mode, after which the device returns to standby. This is not a data register and it is the write operation that causes the one-shot conversion. The data written to this address is irrelevant and is not stored. A zero will always be read from this register. 2.0 LM95241 Registers Command register selects which registers will be read from or written to. Data for this register should be transmitted during the Command Byte of the SMBus write communication. P7 P6 P5 P4 P3 P2 P1 P0 Command P0-P7: Command Register Summary Name Command (Hex) Power-On Default Value (Hex) Read/Write # of used bits Comments Status Register 02h - RO 5 4 status bits and 1 busy bit Configuration Register 03h 00h R/W 5 Includes conversion rate control Remote Diode Filter Control 06h 05h R/W 2 Controls thermal diode filter setting Remote Diode Model Type Select 30h 01h R/W 2 Selects the 2N3904 or Intel processor on 65nm or 90nm process thermal diode model Remote Diode TruTherm Mode Control 07h 01h 6 Enables or disables TruTherm technology for Remote Diode measurements 1-shot 0Fh - WO - Activates one conversion for all 3 channels if the chip is in standby mode (i.e. RUN/STOP bit = 1). Data transmitted by the host is ignored by the LM95241. Local Temperature MSB 10h - RO 8 Remote Temperature 1 MSB 11h - RO 8 Remote Temperature 2 MSB 12h - RO 8 Local Temperature LSB 20h - RO 2 All unused bits will report zero Remote Temperature 1 LSB 21h - RO 3/5 All unused bits will report zero Remote Temperature 2 LSB 22h - RO 3/5 All unused bits will report zero Manufacturer ID FEh 01h RO Revision ID FFh A4h RO www.national.com 12 |
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