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LM95231BIMM Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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LM95231BIMM Datasheet(HTML) 9 Page - National Semiconductor (TI) |
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9 / 20 page  1.0 Functional Description (Continued) the remote diodes to sense temperatures above 127˚C. Local temperature resolution is not programmable and is always 9-bits plus sign and has a 0.25˚C LSb. The LM95231 remote diode temperature accuracy will be trimmed for the thermal diode of a Pentium 4 processor on 90nm process or a 2N3904 transistor and the accuracy will be guaranteed only when using either of these diodes when selected appropriately. TruTherm mode should be enabled when measuring a Pentium 4 processor on 90nm process and disabled when measuring a 2N3904 transistor. Enabling TruTherm mode with a 2N3904 transistor connected may produce unexpected temperature readings. Diode fault detection circuitry in the LM95231 can detect the presence of a remote diode: whether D+ is shorted to V DD, D- or ground, or whether D+ is floating. The LM95231 register set has an 8-bit data structure and includes: 1. Most-Significant-Byte (MSB) Local Temperature Regis- ter 2. Least-Significant-Byte (LSB) Local Temperature Regis- ter 3. MSB Remote Temperature 1 Register 4. LSB Remote Temperature 1 Register 5. MSB Remote Temperature 2 Register 6. LSB Remote Temperature 2 Register 7. Status Register: busy, diode fault 8. Configuration Register: resolution control, conversion rate control, standby control 9. Remote Diode Filter Setting 10. Remote Diode Model Select 11. Remote Diode TruTherm Mode Control 12. 1-shot Register 13. Manufacturer ID 14. Revision ID 1.1 CONVERSION SEQUENCE In the power up default state the LM95231 takes maximum a 77.5 ms to convert the Local Temperature, Remote Tem- perature 1 and 2, and to update all of its registers. Only during the conversion process is the busy bit (D7) in the Status register (02h) high. These conversions are addressed in a round robin sequence. The conversion rate may be modified by the Conversion Rate bits found in the Configu- ration Register (03h). When the conversion rate is modified a delay is inserted between conversions, the actual maximum conversion time remains at 87.7 ms. Different conversion rates will cause the LM95231 to draw different amounts of supply current as shown in Figure 1. 1.2 POWER-ON-DEFAULT STATES LM95231 always powers up to these known default states. The LM95231 remains in these states until after the first conversion. 1. Command Register set to 00h 2. Local Temperature set to 0˚C until the end of the first conversion 3. Remote Diode Temperature set to 0˚C until the end of the first conversion 4. Remote Diode digital filters are on. 5. Remote Diode 1 model is set to Pentium 4 processor on 90nm process with TruTherm mode enabled. Remote Diode 2 model is set to 2N3904 with TruTherm mode disabled. 6. Status Register depends on state of thermal diode in- puts 7. Configuration register set to 00h; continuous conversion, typical time = 85.8 ms when TruTherm Mode is enabled for Remote 1 only 1.3 SMBus INTERFACE The LM95231 operates as a slave on the SMBus, so the SMBCLK line is an input and the SMBDAT line is bidirec- tional. The LM95231 never drives the SMBCLK line and it does not support clock stretching. According to SMBus specifications, the LM95231 has a 7-bit slave address. All bits A6 through A0 are internally programmed and can not be changed by software or hardware. The SMBus slave ad- dress is dependent on the LM95231 part number ordered: Part Number A6 A5 A4 A3 A2 A1 A0 LM95231BIMM, LM95231CIMM 010101 1 LM95231BIMM-1, LM95231CIMM-1 001100 1 LM95231BIMM-2, LM95231CIMM-2 010101 0 20120247 FIGURE 1. Conversion Rate Effect on Power Supply Current www.national.com 9 |
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