Design-In Information VV6501
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10 Design-In Information
10.1 Basic support circuit
10.2 Transistor choice
The ZTX749 has a high min. H
FE
(lower on-chip current). It is also inexpensive and has good heat
dissipation.
10.3 Pin 1 and image orientation
Please note that for the sensor array to produce a correctly aligned image, pin 1 should be located
at the ‘top’ rather than 180 degrees rotated at the ‘bottom’ (see
Figure 3
).
Figure 37 : Basic support circuit
VV6501
Video
Audio
Digital
6
7
8
9
10
11
12
13
14
PORB
SUSPEND
CLKIN
15 16 17
18
19 20
21 22 23
FST
QCLK
D0
D1
D2
D3
D4
24
25
26
27
28
29
30
31
32
n/c
n/c
AUDOUTP
AUDOUTN
33343536123
4
5
PDVREG1V8
6.8nF
10uF
10uF 2.2uF
470nF
100nF
2K2
2.2
uF
100nF
1uF
3V3
4K7
4K7
SDA
1V8
3V3
5V0
SCL
STMicroelectronics advises the use of a grounding star point. All
decoupling capacitors should be placed as close to sensor as
possible.
The support circuit outlined above describes a USB based
system with a nominal 5V supplying the device.
AUDREF
A suitable choice for the
bipolar transistor would be a
ZTX749. It satisfies the
technical specification and
is very cost effective.
