AD7151 datasheet(17/28 Pages) AD

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AD7151

Rev. 0 | Page 17 of 28

TIMEOUT REGISTER

When either the approaching or receding timeout elapses (that

is, after the defined number of CDC conversions is counted),

the data average (and thus the thresholds) is forced to follow the

new CDC data value immediately.

Address Pointer 0x0A

8 Bits, Read/Write, Factory Preset 0x86

Table 9. Timeout Register Bit Map

Bit

Bits [7:4]

When the timeout register equals 0, timeouts are disabled.

Bits [3:0]

Mnemonic

TimeOutApr

TimeOutRec

Default

0x08

0x06

DATA AVERAGE

+ SENSITIVITY

LARGE CHANGE IN DATA

TOWARDS THRESHOLD

DATA AVERAGE

THRESHOLD

TIME

TIMEOUT APPROACHING

The register sets timeouts for the adaptive threshold mode.

The approaching timeout starts when the CDC data crosses the

data average ± sensitivity band toward the threshold, according

to the selected positive, negative, or window threshold mode. The

approaching timeout elapses after the number of conversion cycles

equals 2TimeOutApr, where TimeOutApr is the value of the four most

significant bits of the timeout register.

Figure 37. Threshold Timeout Approaching

After a Large Change in CDC Data Toward Threshold

The receding timeout starts when the CDC data crosses the

data average ± sensitivity band away from the threshold,

according to the selected positive or negative threshold mode.

The receding timeout is not used in the window threshold

mode. The receding timeout elapses after the number of

conversion cycles equals 2TimeOutRec, where TimeOutRec is the

value of the four least significant bits of the timeout register.

DATA AVERAGE

+ SENSITIVITY

LARGE CHANGE IN DATA

AWAY FROM THE THRESHOLD

DATA AVERAGE

THRESHOLD

TIME

TIMEOUT RECEDING

Figure 38. Threshold Timeout Receding

After a Large Change in CDC Data Away from Threshold

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