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EMC1033-ACZT-TR Datasheet(PDF) 11 Page - SMSC Corporation |
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EMC1033-ACZT-TR Datasheet(HTML) 11 Page - SMSC Corporation |
11 / 25 page 1°C Triple SMBus Sensor with Resistance Error Correction Datasheet SMSC EMC1033 11 Revision 1.1 (01-19-07) DATASHEET is a function of temperature. The higher the temperature measured, the greater the error introduced. To provide maximum flexibility to the user, the EMC1033 provides a 6-bit ideality factor register for each remote diode. The ideality factor of the remote diode is programmed in these registers to eliminate errors across all temperatures. See section Section 4.18, "Ideality Factor Register," on page 19 for details on programming these registers. 4.4 Temperature Measurement Results and Data The 11-bit temperature measurement results are stored in temperature value registers. The EMC1033 has two temperature ranges and the default range is from 0 to 127 °C. This range uses binary number format, and the most significant bit is not used. The extended range is from –64 °C to +191°C and is binary offset by 64 °C. Table 4.1 shows the two temperature data formats with an LSB equivalent to 0.125 °C. The format is selected as described in Section 4.11, "Configuration Register," on page 16 Note 4.1 Data in Binary Format reads 0000 0000 000 for all temperatures ≤ 0.00°C Note 4.2 Data in Offset Binary Format reads 0000 0000 000 for all temperatures ≤ -64 °C Note 4.3 Data in Binary Format reads 0111 1111 000 for all temperatures ≥ +127°C Note 4.4 Data in Offset Binary Format reads 1111 1111 000 for all temperatures ≥ +191 °C The 11-bit temperature data is stored with the 8 most significant bits stored in the High Byte register and the 3 least significant bits in the Low Byte register. The Low Byte register contains the three least significant bits as outlined in Table 4.2. These bits are stored in the upper three bits of the register, and the five LSB positions of this register always read zero. In Table 4.2, the upper case “B” shows the bit position of a 16-bit word created by concatenating the High Byte and Low Byte, and the lower case “b” shows the bit position in the 11-bit temperature data. The resolution of the internal temperature is 0.5 °C and the b1 and b0 bits of the Internal Temperature Value Low Byte register will always read 0. Table 4.1 Temperature Data Format ACTUAL TEMP. ( °C) DEFAULT RANGE BINARY EXTENDED RANGE OFFSET BINARY -63 0000 0000 000 Note 4.1 0000 0001 000 Note 4.2 -0.125 0000 0000 000 Note 4.1 0011 1111 111 0 0000 0000 000 Note 4.1 0100 0000 000 +0.125 0000 0000 001 0100 0000 001 +0.250 0000 0000 010 0100 0000 010 +1 0000 0001 000 0100 0001 000 +127 0111 1111 000 Note 4.3 1011 1110 000 +128 0111 1111 000 Note 4.3 1011 1111 000 +190 0111 1111 000 Note 4.3 1111 1110 000 +191 0111 1111 000 Note 4.3 1111 1111 000 Note 4.4 Table 4.2 Bit Position of Two Byte Values HIGH BYTE LOW BYTE B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0 0 0 0 0 0 |
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