EV76C560/660/661 1 line mode
Rev. 0.4 Dec 13 / ViP
BRIEF DESCRIPTION
- Procedure for switching the EV76C560/660/661 matrix sensor in 1 line mode.
Application Note
APPLICABLE PRODUCT
- EV76C560
- EV76C660/661
EOS-AN016
KEYWORDS
- 1 line mode
- line rate
1. DESCRIPTION
This document gives the procedure to switch the EV76C560 matrix sensor in a “1 line mode”. This mode allows using the
matrix sensor like a line scan sensor. The new image frequency unit will be the “line rate”, in line per second. Two
different modes will be available:
A continuous line mode, at more than 12k lines/s.
An interrupted line mode using frame readout and synchronization signals, at more than 63k lines/s.
Figure 1 : Continuous mode timing
Figure 2 : Interrupted mode timing (classic frame synchronization signals)
FEN
LEN
Line 1 Line 2 Line 3
PRELIMINARY
Line 1024
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PRELIMINARY
2. CONTINUOUS LINE MODE USEFUL REGISTERS
This part gives a list of the useful registers to program for activating the continuous line mode.
Table 1 : Continuous line mode registers programming
Register
Address (hex)
Register name
Bits
Register Value
Action / Comments
Extra_line_nb
[15:12]
h1
Reduce to 2 lines
Line_length
[10:0]
h70
For a CLK_CHAIN at 85.5MHz
Roi_expanded
[8]
1
Roi Expanded On
Clamp_auto_en
[9]
0
The clamp is manual
h0A
Roi_max_id
[13:12]
b00
Only one ROI : ROI 1 selected
h0B
Roi_video_en
[3]
0
No video mode
h12
Reg_roi_0l_1
[10:0]
Between d6
and d1024
Every useful line of the matrix
can be chosen
h13
Reg_roi_h_1
[10:0]
d1
The width is one single line
h14
Reg_roi_0c_1
[10:0]
d6
Default value, can be changed
h15
Reg_roi_w_1
[10:0]
d1280
Default value, can be changed
h39
Init_line_nb
[14:12]
d0
Initialisation time reduce to
minimum
h04
h07
To achieve the following line rate, the overlap readout mode must be enabled (if not, the line rate will be reduced):
With a CLK_CHAIN = 48MHz, the maximum line rate is 7200 lines/s (line length is d200).
With a CLK_CHAIN = 85.5MHz, the maximum line rate is up to 12600 lines/s (line length is d112).
The default line mode is defined without context or histogram data:
-
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If only the context is enabled, extra_line_nb must be set to 3
-
If only the histogram is enabled, extra_line_nb must be set to 2
-
If the context and the histogram are enabled, extra_line_nb must be set to 4
EOS-AN016
Rev. 0.4 Dec 13 / ViP
PRELIMINARY
EOS-AN016
3. INTERRUPTED LINE MODE USEFUL REGISTERS
This part gives a list of the useful registers to program for activating the interrupted line mode.
The user can choose one line (among the 1024 matrix useful lines). The sensor will read always this same line during the
ROI height. This mode is a line scan with frame synchronization.
Basically, if the physical line 512 is chosen, the sensor will read this line 1024 times (by default, but can be changed).
Table 2 : Interrupted line mode registers programming
Register
Address (hex)
Register name
Bits
h04
Extra_line_nb
[15:12]
h1
Reduce to 2 lines
h04
Line_length
[10:0]
h70
For a CLK_CHAIN at 85.5MHz
h07
Roi_expanded
[8]
1
Roi Expanded On
h07
Clamp_auto_en
[9]
0
The clamp is manual
h0A
Roi_max_id
[13:12]
00
Only one ROI : ROI 1 selected
Register Value
Action / Comments
h0B
Roi_video_en
[3]
0
No video mode
h0B
Roi_readout_mode
[5:4]
b10
ERS readout mode
h0B
Roi_overlap_mode
[2]
1
Overlap mode enabled
h12
Reg_roi_0l_1
[10:0]
d6
Default value, can be changed
h13
Reg_roi_h_1
[10:0]
d1024
Default value, can be changed
h14
Reg_roi_0c_1
[10:0]
d6
Default value, can be changed
h15
Reg_roi_w_1
[10:0]
d1280
Default value, can be changed
h39
Init_line_nb
[14:12]
d2
Initialisation time at 2 lines
h75
Line mode
[11]
1
Specific line mode enabled
Line number
[10:0]
d511
Line 511 is reset, can be
changed
Line mode
[11]
1
Specific line mode enabled
Line number
[10:0]
d512
Line 512 is read, can be
changed
h75
h76
h76
The following line rate can be achieved, depending on the CLK_CHAIN:
With a CLK_CHAIN = 48MHz, the maximum line rate is up to 35600 lines/s (line length is d200).
With a CLK_CHAIN = 85.5MHz, the maximum line rate is up to 63600 lines/s (line length is d112).
The line rate can be reduced by increasing the value of the line_length register. But it will at the same time increase the
integration time.
The time between two frames is done versus the readout mode in the following table.
Table 3 : time between frames adjustments
Readout mode
Overlap
Init_line
Clamp enable
Roi expanded
Time between frames
ERS
On
2
Off
On
95.3 µs (6 lines)
ERS
On
0
On
Off
190 µs (12 lines)
Important note: if Context and/or Histogram are output, the bitfield Extra_line_nb must be set at 3.
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Rev. 0.4 Dec 13 / ViP
PRELIMINARY
4. GENERAL CONSIDERATIONS
Using the line modes, the user will take care of some specific adjustments:
Image offset level adjustment using the register 38h (clamp_manual_offset)
Image offset improvement with register 41h: value 9630h for Global Shutter mode, value 9605h for ERS / Global
Reset modes.
Table 4 : Register h41 values versus readout mode
Register Address
(hex)
Value Global Shutter
(hex)
Value Global Reset / ERS
(hex)
h41
h9630
h9605
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EOS-AN016
Rev. 0.4 Dec 13 / ViP