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LM95231CIMMX-2 Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LM95231CIMMX-2 Datasheet(HTML) 10 Page - National Semiconductor (TI) |
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10 / 20 page  1.0 Functional Description (Continued) 1.4 TEMPERATURE DATA FORMAT Temperature data can only be read from the Local and Remote Temperature registers . Remote temperature data with the digital filter off is repre- sented by an 11-bit, two’s complement word or unsigned binary word with an LSb (Least Significant Bit) equal to 0.125˚C. The data format is a left justified 16-bit word avail- able in two 8-bit registers. Unused bits will always report "0". 11-bit, 2’s complement (10-bit plus sign) Temperature Digital Output Binary Hex +125˚C 0111 1101 0000 0000 7D00h +25˚C 0001 1001 0000 0000 1900h +1˚C 0000 0001 0000 0000 0100h +0.125˚C 0000 0000 0010 0000 0020h 0˚C 0000 0000 0000 0000 0000h −0.125˚C 1111 1111 1110 0000 FFE0h −1˚C 1111 1111 0000 0000 FF00h −25˚C 1110 0111 0000 0000 E700h −55˚C 1100 1001 0000 0000 C900h 11-bit, unsigned binary Temperature Digital Output Binary Hex +255.875˚C 1111 1111 1110 0000 FFE0h +255˚C 1111 1111 0000 0000 FF00h +201˚C 1100 1001 0000 0000 C900h +125˚C 0111 1101 0000 0000 7D00h +25˚C 0001 1001 0000 0000 1900h +1˚C 0000 0001 0000 0000 0100h +0.125˚C 0000 0000 0010 0000 0020h 0˚C 0000 0000 0000 0000 0000h Remote temperature data with the digital filter on is repre- sented by a 13-bit, two’s complement word or unsigned binary word with an LSb (Least Significant Bit) equal to 0.03125˚C (1/32˚C). The data format is a left justified 16-bit word available in two 8-bit registers. Unused bits will always report "0". 13-bit, 2’s complement (12-bit plus sign) Temperature Digital Output Binary Hex +125˚C 0111 1101 0000 0000 7D00h +25˚C 0001 1001 0000 0000 1900h +1˚C 0000 0001 0000 0000 0100h +0.03125˚C 0000 0000 0000 1000 0008h 0˚C 0000 0000 0000 0000 0000h −0.03125˚C 1111 1111 1111 1000 FFF8h −1˚C 1111 1111 0000 0000 FF00h −25˚C 1110 0111 0000 0000 E700h −55˚C 1100 1001 0000 0000 C900h 13-bit, unsigned binary Temperature Digital Output Binary Hex +255.875˚C 1111 1111 1110 0000 FFE0h +255˚C 1111 1111 0000 0000 FF00h +201˚C 1100 1001 0000 0000 C900h +125˚C 0111 1101 0000 0000 7D00h +25˚C 0001 1001 0000 0000 1900h +1˚C 0000 0001 0000 0000 0100h +0.03125˚C 0000 0000 0000 1000 0008h 0˚C 0000 0000 0000 0000 0000h Local Temperature data is represented by a 10-bit, two’s complement word with an LSb (Least Significant Bit) equal to 0.25˚C. The data format is a left justified 16-bit word avail- able in two 8-bit registers. Unused bits will always report "0". Local temperature readings greater than +127.875˚C are clamped to +127.875˚C, they will not roll-over to negative temperature readings. Temperature Digital Output Binary Hex +125˚C 0111 1101 0000 0000 7D00h +25˚C 0001 1001 0000 0000 1900h +1˚C 0000 0001 0000 0000 0100h +0.25˚C 0000 0000 0100 0000 0040h 0˚C 0000 0000 0000 0000 0000h −0.25˚C 1111 1111 1100 0000 FFC0h −1˚C 1111 1111 0000 0000 FF00h −25˚C 1110 0111 0000 0000 E700h −55˚C 1100 1001 0000 0000 C900h 1.5 SMBDAT OPEN-DRAIN OUTPUT The SMBDAT output is an open-drain output and does not have internal pull-ups. A “high” level will not be observed on this pin until pull-up current is provided by some external source, typically a pull-up resistor. Choice of resistor value depends on many system factors but, in general, the pull-up resistor should be as large as possible without effecting the SMBus desired data rate. This will minimize any internal temperature reading errors due to internal heating of the LM95231. The maximum resistance of the pull-up to provide a 2.1V high level, based on LM95231 specification for High Level Output Current with the supply voltage at 3.0V, is 82k Ω (5%) or 88.7k Ω (1%). 1.6 DIODE FAULT DETECTION The LM95231 is equipped with operational circuitry designed to detect fault conditions concerning the remote diodes. In the event that the D+ pin is detected as shorted to GND, D−, V DD or D+ is floating, the Remote Temperature reading is –128.000 ˚C if signed format is selected and +255.875 if unsigned format is selected. In addition, the appropriate status register bits RD1M or RD2M (D1 or D0) are set. When TruTherm mode is active the condition of diode short of D+ to D− will not be detected. Connecting a 2N3904 transistor with TruTherm mode active may cause a detection of a diode fault. www.national.com 10 |
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