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EMCT03 Datasheet(PDF) 9 Page - SMSC Corporation |
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EMCT03 Datasheet(HTML) 9 Page - SMSC Corporation |
9 / 16 page 1°C Triple SMBus Temperature Sensor Datasheet SMSC EMCT03 9 Revision 2.3 (04-19-05) DATASHEET During Power on Reset (POR), the default values are stored in the registers. A POR is initiated when power is first applied to the part and the voltage on the VDD supply surpasses the POR level as specified in the electrical characteristics. Any reads to undefined registers will return 00h. Writes to any undefined registers will not have an effect. The EMCT03 uses an interlock mechanism that prevents changes in register content when fresh readings come in from the ADC during successive reads from a host. When the High Byte is read, the last conversion value is latched into the High Byte and Low Byte. Please note that the interlock mechanism is only effective when reading the High Byte first. 3.4 Temperature Monitor Registers As shown in Table 3.4, each temperature monitor has two byte wide data registers. The external monitors are equipped with both legacy and extended data format. The 11 bit data temperature is stored aligned to the left resulting in the High Byte to contain temperature in 1 °C steps and the Low Byte to contain fractions of °C as outlined below: FAh N/A Extended Format Remote Temperature 1 High Byte 00h FBh N/A Extended Format Remote Temperature 1 Low Byte 00h FCh N/A Extended Format Remote Temperature 2 High Byte 00h FDh N/A Extended Format Remote Temperature 2 Low Byte 00h 02h N/A Status register 00h 03h 09h Configuration register 47h N/A 0Fh One Shot Command -- FEh N/A Manufacturer Identifier 5Dh FFh N/A Silicon Revision Identifier 01h 11h, 16h, 4Ah, 60h, 61h, 62h, 79h, 7Ah 11h, 16h, 4Ah, 60h, 61h, 62h, 79h, 7Ah Reserved Registers for production test Table 3.5 High Byte Temperature Register REGISTER BIT 7 BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1 BIT 0 Temperature High Byte Registers 00h, 01h, F8h, FAh, FCh SIGN 64 32 16 8421 Table 3.6 Low Byte Temperature Register REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 Temperature Low Byte Registers 23h, 10h, F9h, FBh, FDh 0.500 0.250 0.125 00000 Table 3.4 Register Table (continued) REGISTER READ ADDRESS REGISTER WRITE ADDRESS REGISTER NAME DEFAULT VALUE |
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