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PDF SAA8115HL Data sheet ( Hoja de datos )

Número de pieza SAA8115HL
Descripción Digital camera USB interface
Fabricantes NXP Semiconductors 
Logotipo NXP Semiconductors Logotipo



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No Preview Available ! SAA8115HL Hoja de datos, Descripción, Manual

INTEGRATED CIRCUITS
DATA SHEET
SAA8115HL
Digital camera USB interface
Preliminary specification
Supersedes data of 1999 Jun 28
File under Integrated Circuits, IC22
2000 Jan 27

1 page




SAA8115HL pdf
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AD10
to AD0
DQ15
to DQ0
YUV7
to YUV0
LLC
HREF
VS
48, 47, 45, 44,
42, 39, 38, 40,
41, 43, 46
24,
53,
102
77, 76, 75, 74, 67, 65,
62, 60, 61, 63, 64, 66,
70, 71, 72, 73
52 56 57 58 55 59 51
SDRAM
INTERFACE
7, 16, 82, 84, 23, 29, 33 115, 116, 79, 88, 6, 18, 126, 83, 86,
37, 50, 85, 122, 54, 101
117, 118 93, 119, 49, 68, 127, 89, 96,
69, 141 124, 125
123, 134 78, 98, 128 97, 129
142
USB
RAM
SPACE
103 100 109 112 110 111 108
POWER MANAGEMENT
99
104
105
28, 27, 26, 25
22, 21, 20, 19
30
31
32
FRAME RATE
CONVERTER
VIDEO
FORMATTER
COMPRESSION
ENGINE
TRANSFER
BUFFER
USB
VIDEO
FIFO
PSIE MMU
ATX
80
81
UCINT
UCPOR
UCCLK
ATXDP
ATXDM
SNDA
SNCL
SNRES
34
35
36
SNERT
INTERFACE
SAA8115HL
AUDIO
PLL
AUDIO
ADC
I2C-BUS
INTERFACE
106
107
SCL
SDA
AUDIO
VARIABLE
GAIN
AMPLIFIER
130
VGAIN
PULSE PATTERN GENERATOR
(PPG)
DC-TO-DC CONVERTER
MAIN
OSCILLATOR
MICROPHONE
SUPPLY
AUDIO
LOW NOISE
AMPLIFIER
131
LNAOUT
139, 140, 137, 138, 3, 2,
143, 144 136, 135 1, 4 8 5 9 10 12 13 14 15 11 17 87 90 91 92 94 95 113 114 120 121 133 132
FCE349
Fig.1 Block diagram.

5 Page





SAA8115HL arduino
Philips Semiconductors
Digital camera USB interface
Preliminary specification
SAA8115HL
8 FUNCTIONAL DESCRIPTION
8.1 Video synchronization
The video synchronization module is capable of locking to
the video signal implementing a horizontal gate signal
HREF (HREF = HIGH when data is valid) and a VS signal
indicating the start of a new video frame.
8.2 Frame rate converter and SDRAM interface
An optional SDRAM (external) can be accessed using the
SDRAM interface which is integrated in the SAA8115HL.
Pinning and functionality is based on the NEC
µPD4516161 (16 Mbits) and the NEC µPD4564163
(64 Mbits).
When used, the memory is placed at the video input of the
SAA8115HL before prefilter, scaler and compression
engine. At this point only YUV 4 : 2 : 2 formatted data is
available.
The use of the SDRAM is twofold:
Lowering the frame rate. The memory enables to store
one frame of video accumulated at a specific rate and to
read it out at a lower frame rate. For interline VGA
sensors, the input frame rate is either 30 fps or 15 fps.
It can be lowered with a factor of 2, 3, 6, 16 or 32.
For CIF or medium resolution PAL, the input frame rate
is only 30 fps
Enhanced snapshot mode. Storage of full size VGA
pictures in 4 : 2 : 2 format which can be retrieved upon
dedicated software command.
8.3 Video formatter: downsampler and cutter
This block is used to achieve the required output format
from the specified sensor formats (see Fig.3). It works for
YUV 4 : 2 : 2 only. In RAW mode this block is by-passed to
create a full resolution snapshot.
Horizontally a downsampling from 512 or 640 to either
384, 320, 192 or 160 or from 352 to 176 is necessary.
The horizontal downsampling is performed with the use of
a Variable Phase Delay filter (VPD-4). This filter can
realize the needed downsample factors. To avoid aliasing,
this module also contains a prefilter which has four modes:
No filter for medium resolution PAL (512 × 288) to CIF
(352 × 288) or SIF (320 × 240)
Prefilter A (3 taps) for VGA (640 × 480) to CIF or SIF,
CIF to QCIF (176 × 144) or QSIF (160 × 120)
Prefilter B (7 taps) for medium resolution PAL to QCIF
or QSIF
Prefilter A combined with prefilter B-comb (13 taps) for
VGA to QCIF or QSIF.
Prefilter B-comb is similar to prefilter B but inserts extra
taps with amplification 0.
The vertical downsampling in PAL mode is from CIF to
QCIF only. This is done via a vertical filter A (3 taps).
In VGA mode a 4 taps polyphase filter is applied to scale
from 640 × 480 to CIF and QCIF.
From a full size QCIF picture a sub-QCIF (128 × 96) cut
can be made. For the zoomed sub-QCIF format, the origin
(upper left corner) is programmable via SNERT in 13 steps
(both horizontally and vertically), so that an electronic pan
and tilt is possible.
The incoming 4 : 2 : 2 data is vertically filtered to 4 : 2 : 0,
in order to be sent over USB, by throwing away colour
samples. In the even lines the V-samples are discarded, in
the odd lines the U-samples.
2000 Jan 27
11

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