VD5377 datasheet(39/88 Pages) STMICROELECTRONICS

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Doc ID 022952 Rev 2

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VD5377

Additional features

7.1

Auto-movement filter

An auto-movement filter has been added in VD5377 rev 2.0 to enhance the navigation

performance in high ambient light conditions.

The filter can only be enabled in automatic power mode(b). On initial wakeup, after sleep,

the filter will hold the sensor in the lowest run state until motion is seen is X times in Y

period. Both X and Y are programmable.

With the default settings, the AMF will look for motion in three separate 7 ms periods. Once

motion is seen in one 7 ms period, the filter will immediately move onto the next 7 ms

period.

b. Automatic power mode without standby (SYSTEM_CONFIG 0x5 = 0x09) does not function correctly when the

auto-movement filter is enabled. Suggested workaround is to use automatic power mode with use_standby_pin

enabled. Alternatively, there is a firmware patch available which can be requested from STMicroelectronics.

Table 24. Auto-movement filter

Addr

(Hex)

Signal name

Bit

Type

Default

(Hex)

Comment

AUTO_MOVEMENT_

CTRL1

bAutoMoveFilterEn

able

0RW

Auto movement filter enable

0 = Disable

1 = Enable

ucAutoMoveFilterFr

ameNb

6:1

Number of frames on which the

auto movement filter is applied

(must be greater than 1).

bAutoMoveSaturate

dExpo

7RW

When image in high light and

exposure (reg 0x47) is set to 1,

flag used by engine to discard

motion in this condition.

0 = Disable

1 = Enable

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