ADM1034 datasheet(18/40 Pages) AD

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ADM1034

Rev. 0 | Page 18 of 40

ADDITIONAL FUNCTIONS

Several other temperature measurement functions available on

the ADM1034 offer the systems designer added flexibility.

Turn-off Averaging

The ADM1034 performs averaging at conversion rates of less

than or equal to 8 conversions per second. This means that the

value in the measurement register is the average of 16 measure-

ments. For faster measurements, set the conversion rate to 16

conversions per second or greater. (Averaging is not carried out

at these conversion rates.) Alternatively, switch off averaging at

the slower conversion rates by setting Bit 1 (AVG) of

Configuration 1 Register (Address 0x01).

Single-Channel ADC Conversions

In normal operating mode, the ADM1034 converts on three

temperature channels: the local temperature channel, and the

remote 1 and remote 2 channels. However, the user has the

option to set up the ADM1034 to convert on one channel only.

To enable single-channel mode, the user sets the round-robin

bit (Bit 7) in Configuration Register 2 (Address 0x02) to 0.

When the round-robin bit equals 1, the ADM1034 converts on

all three temperature channels. In single-channel mode, it

converts on one channel only, to be determined by the state of

the channel selector bits (Bits 5 and 4) of the Configuration

Table 11. Channel Selector

Bits 5:4

Channel Selector (Configuration 2)

Local Channel = Default

Remote 1 Channel

Remote 2 Channel

Reserved

Removing Temperature Errors

As CPUs run faster and faster, it gets more difficult to avoid

high frequency clocks when routing the D+ and D− traces

around a system board. Even when the recommended layout

guidelines are followed, temperature errors attributed to noise

coupled onto the D+ and D− lines remain. High frequency

noise generally gives temperature measurements that are

consistently too high. The ADM1034 has Local, Remote 1, and

Remote 2 temperature offset registers at 0x16, 0x17, and 0x18—

one for each channel. By completing a one-time calibration, the

user can determine the offset caused by the system board noise

and remove it using the offset registers. The registers

automatically add a twos compliment word to the remote

temperature measurements, ensuring correct readings in the

value registers.

Table 12. Offset Registers

Registration

Description

Default

0x16

Local Offset

0x00

0x17

Remote 1 Offset

0x00

0x18

Remote 2 Offset

0x00

Table 13. Offset Register Values

Code

Offset Value

0 0000 000

0°C (Default Value)

0 0000 001

0.125°C

0 0000 111

0.875°C

0 0001 111

1.875°C

0 0111 111

7.875°C

0 1111 111

15.875°C

1 0000 000

−16°C

1 1111 000

−0.875°C

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