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ADT7490ARQZ-R7 Datasheet(PDF) 49 Page - ON Semiconductor |
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ADT7490ARQZ-R7 Datasheet(HTML) 49 Page - ON Semiconductor |
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49 / 75 page  ADT7490 http://onsemi.com 49 Table 23. PECI Reading Registers (Power−On Default = 0x80) Register Address R/W Description 0x33 Read−only PECI0: This register reads the eight bits representative of PECI Client Address 0x30. 0x1A Read−only PECI1: This register reads the eight bits representative of PECI Client Address 0x31. 0x1B Read−only PECI2: This register reads the eight bits representative of PECI Client Address 0x32. 0x1C Read−only PECI3: This register reads the eight bits representative of PECI Client Address 0x33. Table 24. IMON/VTT Reading Registers (Power−On Default = 0x00) Register Address R/W Description 0x1D Read−only Reflects the voltage measurement at the IMON input on Pin 19 (8 MSBs of reading). Input range of 0 V to 2.25 V. 0x1E Read−only Reflects the voltage measurement at the VTT input on Pin 8 (8 MSBs of reading). Input range of 0 V to 2.25 V. Table 25. Register 0x1F — Extended Resolution 3 (Power−On Default = 0x00) Bit No. R/W Description [3:0] Read−only Reserved. [5:4] Read−only Hold the two LSBs of the 10−bit VTT measurement. [7:6] Read−only Hold the two LSBs of the 10−bit IMON measurement. Table 26. Voltage Reading Registers (Power−On Default = 0x00) (Note 1) Register Address R/W Description 0x20 Read−only Reflects the voltage measurement at the 2.5 VIN input on Pin 22 (8 MSBs of reading). 0x21 Read−only Reflects the voltage measurement (Note 2) at the VCCP input on Pin 23 (8 MSBs of reading). 0x22 Read−only Reflects the voltage measurement (Note 3) at the VCC input on Pin 4 (8 MSBs of reading). 0x23 Read−only Reflects the voltage measurement at the 5 VIN input on Pin 20 (8 MSBs of reading). 0x24 Read−only Reflects the voltage measurement at the 12 VIN input on Pin 21 (8 MSBs of reading). 1. If the extended resolution bits of these readings are also being read, the extended resolution registers (Register 0x76, Register 0x77) must be read first. Once the extended resolution registers have been read, the associated MSB reading registers are frozen until read. Both the extended resolution registers and the MSB registers are frozen. 2. If VCCP Low (Bit 6 of 0x10) is set, VCCP can control the sleep state of the ADT7490. 3. VCC (Pin 4) is the supply voltage for the ADT7490. Table 27. Temperature Reading Registers (Power−On Default = 0x80) (Note 1 and 2) Register Address R/W Description 0x25 Read−only Remote 1 temperature reading (Note 3 and 4) (8 MSBs of reading). 0x26 Read−only Local temperature reading (8 MSBs of reading). 0x27 Read−only Remote 2 temperature reading (Note 3 and 4) (8 MSBs of reading). 1. If the extended resolution bits of these readings are also being read, the extended resolution registers (Register 0x76, Register 0x77) must be read first. Once the extended resolution registers have been read, all associated MSB reading registers are frozen until read. Both the extended resolution registers and the MSB registers are frozen. 2. These temperature readings can be in twos complement or Offset 64 format; this interpretation is determined by Bit 0 of Configuration Register 5 (0x7C). 3. In twos complement mode, a temperature reading of −128°C (0x80) indicates a diode fault (open or short) on that channel. 4. In Offset 64 mode, a temperature reading of −64°C (0x00) indicates a diode fault (open or short) on that channel. |
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