ADT7490ARQZ-R7 datasheet(49/75 Pages) ONSEMI

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ADT7490

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Table 23. PECI Reading Registers (Power−On Default = 0x80)

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)

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)

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)

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

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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