VD5377CBSW datasheet(34/88 Pages) STMICROELECTRONICS

34 / 88 page

Key features

VD5377

34/88

Doc ID 022952 Rev 2

0x47 gives the current exposure time. This register is also used to enter the required

exposure time in manual exposure mode. Register 0x44 is the MAX_EXPO_PIX (read-

only).

Registers 0x45/0x46 are the upper and lower exposure targets (180 to 240 by default).

When the MEP is within this range the exposure is judged to have “converged” and no

further exposure updates are required until the MEP moves outside the target range. It is not

normally required to adjust the exposure targets.

The default exposure range is 1 to 255. These limits are programmable with registers

0x49/0x4a.

By default, exposure update rate is every two frames. This can be adjusted using register

0x4b. Exposure convergence can be modified by changing the exposure

increment/decrement step sizes with registers 0x4e/0x4f/0x50.

Table 18. Exposure control

Addr

(Hex)

Signal name

Bit

Type

Default

(Hex)

Comment

EXPOSURE_CONTROL

autoexpo_en

Auto exposure control

0 = Disable

1 = Enable

autoexpo_status

6:4

Auto exposure status

0 = UNDEF (no AEC

performed yet)

1 = LOW (exposure

increasing)

2 = STABLE (max exposed

pixel within range)

3 = HIGH (exposure

decreasing)

4 = SATURATED (exposure

saturation decreasing)

autoexpo_limit_flag

Exposure limit reached flag

0 = Exposure time within

range

1 = Exposure time limit

reached

MAX_EXPO_PIX

max_exposed_pixel_v

alue

7:0

Second maximum pixel value

of the current frame (before

CDS)

MAX_EXPO_PIX_THRE

SH_HIGH

max_exposed_pixel_t

hresh_high

7:0

High threshold value of max

exposed pixel where the AEC

is stable.

MAX_EXPO_PIX_THRE

SH_LOW

max_exposed_pixel_t

hresh_low

7:0

Low threshold value of max

exposed pixel where the AEC

is stable.

EXPOTIME

exposure_time

7:0

PRW

Exposure time value in 3 MHz

clk period step (333ns)

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