LM9627CCEA National Semiconductor, LM9627CCEA Datasheet - Page 17

• Manufacturer Part Number: LM9627CCEA
• Manufacturer: National Semiconductor
• Type: CMOSr

Specifications of LM9627CCEA

• Sensor Image Color Type: Color
• Sensor Image Size Range: 250,920 to 480,000Pixels
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: 0C to 50C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 48
• Lead Free Status / RoHS Status: Not Compliant

Functional Description
8.0
8.1
The LM9627 has a built-in bad pixel detection and correction
block that operates on the fly. This block can be switched off by
the user.
8.2
In addition to the programmable gain the LM9627 has a built in
black level compensation block as illustrated in Figure 25. This
block can be switched off.
The black level compensation block will subtract the average
signal level of the black pixels around the array from the digital
video output to compensate for the temperature and integration
time dependent dark signal level of the pixels. The exponential
averaging circuit shown in figure 25 only operates on the least
significant 8 bits of the video data.
9.0
9.1
The LM9627 is equipped with an on-board power management
system allowing the analog and digital circuitry to be switched
off (power down) and on (power up) at any time.
The sensor can be put into power down mode by asserting a
logic one on the “pdwn” pin or by writing to the power down bit in
the main configuration register via the I
interface.
To power up the sensor a logic zero can be asserted on the
“pdwn” pin or write to the power down bit in the main configura-
tion register via the I
It will take a few milli seconds for all the circuits to power up. The
power management register contains a bit indicating when the
sensor is ready for use. During this time the sensor cannot be
used for capturing images. A status bit in the power manage-
ment register will indicate when the sensor is ready for use.
9.2
In addition to the power up/power down features of the sensor,
sections of the analog video processing chain can be powered
down and re-routed during normal operation. This flexibility
allows power dissipation to be traded of with signal gain as
shown in the table below:
Confidential
input signal
SIGNAL PROCESSING
Bad Pixel Detection & Correction
Black Level Compensation
POWER MANAGMENT
Power Up and Down
Advanced Power Features
Figure 25. Digital Black Level Compensation.
PGA Amp
on
off
*
(1-a)
*
a
Figure 26. Power Control
2
C compatible serial interface.
+
+
only enabled for black pixels
Power Saving
0mW
10mW
(continued)
z
-1
2
C compatible serial
-
+
17
10.0 ANALOG GAIN ADJUSTMENT
The integrated analog programmable gain amplifier is capable
of applying a linear gain 1X to 5.6X in 64 linear steps. This can
be programmed using the VGAIN register as shown in the table
below:
VidGain
Code
Dec
10
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
11
0
1
2
3
4
5
6
7
8
9
VidGain
Code
Hex
0C
0D
1C
1D
0A
0B
0E
0F
1A
1B
1E
1F
00
01
02
03
04
05
06
07
08
09
10
12
13
14
15
16
17
18
19
11
Value
Gain
Amp
1.07
1.15
1.22
1.29
1.37
1.44
1.51
1.58
1.66
1.73
1.88
1.95
2.02
2.17
2.24
2.31
2.39
2.46
2.53
2.61
2.68
2.75
2.83
2.97
3.04
3.12
3.19
3.26
1.8
2.1
2.9
1
VidGain
Code
Dec
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
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VidGain
Code
Hex
2C
2D
3C
3D
2A
2B
2E
2F
3A
3B
3E
3F
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
Value
Gain
Amp
3.34
3.41
3.48
3.56
3.63
3.77
3.85
3.92
3.99
4.07
4.14
4.21
4.29
4.36
4.43
4.58
4.65
4.72
4.87
4.94
5.02
5.09
5.16
5.23
5.31
5.38
5.45
5.53
3.7
4.5
4.8
5.6