ADM1027 datasheet(13/56 Pages) AD

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REV. A

ADM1027

–13–

VID CODE MONITORING

The ADM1027 has five dedicated voltage ID (VID code) inputs.

These are digital inputs that can be read back through the

VID register (Reg. 0x43) to determine the processor voltage

required/being used in the system. Five VID code inputs

support VRM9.x solutions.

VID CODE REGISTER – Register 0x43

<0> = VID0

(reflects logic state of Pin 5)

<1> = VID1

(reflects logic state of Pin 6)

<2> = VID2

(reflects logic state of Pin 7)

<3> = VID3

(reflects logic state of Pin 8)

<4> = VID4

(reflects logic state of Pin 19)

ADDITIONAL ADC FUNCTIONS

A number of other functions are available on the ADM1027 to

offer the systems designer increased flexibility:

Turn Off Averaging

For each voltage measurement read from a value register,

16 readings have actually been made internally and the results

averaged before being placed into the value register. There may

be an instance where the user would like to speed up conversions.

Setting Bit 4 of Configuration Register 2 (Reg. 0x73) turns

averaging off. This effectively gives a reading 16

¥ faster than

711

ms, but the reading may be noisier.

Bypass Voltage Input Attenuators

Setting Bit 5 of Configuration Register 2 (Reg. 0x73) removes

the attenuation circuitry from the 2.5 V, VCCP, VCC, 5 V, and

12 V inputs. This allows the user to directly connect external

sensors or rescale the analog voltage measurement inputs for

other applications. The input range of the ADC without the

attenuators is 0 V to 2.25 V.

Single-Channel ADC Conversions

Setting Bit 6 of Configuration Register 2 (Reg. 0x73) places the

ADM1027 into single-channel ADC conversion mode. In this

mode, the ADM1027 can be made to read a single voltage channel

only. If the internal ADM1027 clock is used, the selected input

will be read every 711

ms. The appropriate ADC channel is

selected by writing to Bits <7:5> of TACH1 minimum high

byte register (0x55).

Bits <7:5> Reg. 0x55

Channel Selected

000

2.5 V

001

VCCP

010

VCC

011

5 V

100

12 V

Configuration Register 2 (Reg. 0x73)

<4> = 1

Averaging off

<5> = 1

Bypass input attenuators

<6> = 1

Single-channel convert mode

TACH1 Minimum High Byte (Reg. 0x55)

<7:5>

Selects ADC channel for single-channel convert mode

ADM1027 Datasheet(PDF) 13 Page - Analog Devices

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