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LM95221 Datasheet(PDF) 8 Page - Texas Instruments |
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LM95221 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 25 page LM95221 SNIS134B – MAY 2004 – REVISED MARCH 2013 www.ti.com FUNCTIONAL DESCRIPTION The LM95221 is a digital sensor that can sense the temperature of 3 thermal zones using a sigma-delta analog- to-digital converter. It can measure its local die temperature and the temperature of two diode connected MMBT3904 transistors using a ΔVbe temperature sensing method. The 2-wire serial interface, of the LM95221, is compatible with SMBus 2.0 and I2C. Please see the SMBus 2.0 specification for a detailed description of the differences between the I2C bus and SMBus. The temperature conversion rate is programmable to allow the user to optimize the current consumption of the LM95221 to the system requirements. The LM95221 can be placed in shutdown to minimize power consumption when temperature data is not required. While in shutdown, a 1-shot conversion mode allows system control of the conversion rate for ultimate flexibility. The remote diode temperature resolution is eleven bits and is programmable to 11-bits unsigned or 10-bits plus sign. The least-significant-bit (LSb) weight for both resolutions is 0.125°C. The unsigned resolution allows 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 LM95221 remote diode temperature accuracy will be trimmed for the thermal diode of a Prescott processor and the accuracy will be ensured only when using this diode. Diode fault detection circuitry in the LM95221 can detect the presence of a remote diode: whether D+ is shorted to VDD, D- or ground, or whether D+ is floating. The LM95221 register set has an 8-bit data structure and includes: 1. Most-Significant-Byte (MSB) Local Temperature Register 2. Least-Significant-Byte (LSB) Local Temperature Register 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. 1-shot Register 10. Manufacturer ID 11. Revision ID CONVERSION SEQUENCE The LM95221 takes approximately 66 ms to convert the Local Temperature, Remote Temperature 1 and 2, and to update all of its registers. Only during the conversion process the busy bit (D7) in the Status register (02h) is high. These conversions are addressed in a round robin sequence. The conversion rate may be modified by the Conversion Rate bits found in the Configuration Register (03h). When the conversion rate is modified a delay is inserted between conversions, the actual conversion time remains at 66ms (26 ms for each remote and 14 ms for local). Different conversion rates will cause the LM95221 to draw different amounts of supply current as shown in Figure 7. 8 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Product Folder Links: LM95221 |
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