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VD5377 数据表(PDF) 35 Page - STMicroelectronics

部件名 VD5377
功能描述  Ultra-low power motion sensor for optical finger navigation (OFN)
PDF  88 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

VD5377 数据表(HTML) 35 Page - STMicroelectronics

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VD5377
Key features
6.5
5 x 5 high pass filter
Before each frame is processed the image data is passed through a high-pass filter to
extract edge information. The PARAMETERS_3 register 0x28 bit 5 (Table 19) permits
selection between two high pass filter options. 3 x 3 is the default high-pass filter. The
alternative 5 x 5 high-pass filter has a lower cut-off frequency and so preserves more
information in lower contrast images. This may help improve tracking performance in some
situations, although a possible effect is an increase in hover (this can be overcome by
increasing min_features threshold, register 0x29).
49
EXPOTIME_MAX
exposure_time_max
7:0
RW
ff
Maximum exposure time
applied by the AEC.
4a
EXPOTIME_MIN
exposure_time_min
7:0
RW
01
Minimum exposure time
applied by the AEC.
4b
EXPO_FRAME_UPDAT
E
autoexpo_frame_upda
te
7:0
RW
01
Exposure update frequency
(every N+1 frames). Default is
every two frames.
4e
EXPOTIME_INC_STEP expo_inc_step
7:0
RW
04
Exposure increment step
(used when below
max_expo_pix_thresh_low).
4f
EXPOTIME_DEC_STEP expo_dec_step
7:0
RW
04
Exposure decrement step
(used when above
max_expo_pix_thresh_high).
50
EXPOTIME_SAT_DEC_
STEP
expo_sat_dec_step
7:0
RW
10
Exposure decrement step
(used when above
max_expo_pix is
saturated = 255).
Table 18. Exposure control (continued)
Addr
(Hex)
Register name
Signal name
Bit
Type
Default
(Hex)
Comment
Table 19. 5x5 high-pass filter register
Addr
(Hex)
Register name
SIgnal name
Bit
Type
Default
(Hex)
Comment
28
PARAMETERS_3
Reserved
3:0
PRW
04
Reserved
Reserved
4
PRW
01
Reserved
hpf_5x5_sel
5
PRW
00
Select between 3 x 3 and 5 x 5
high pass filter.
0 = 3 x 3 high pass filter
1 = 5 x 5 high pass filter
Reserved
6
PRW
01
Reserved



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