VV5409C001 View Datasheet(PDF) - Vision
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VV5409C001 Datasheet PDF : 39 Pages
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VV5409 CMOS Monochrome Sensor Datasheet (Restricted) Rev 1.0
[120] - Analogue Test Register AT0
Bit
Function
PAL/NTSC
value
Default
Comment
0 Enable test output on AVO
0
Off / On
1 Monitor bitline voltage or
0
input to the Column Sample
Hold
Vx / V1
2 Monitor column 354 or 355
0
354 / 355
3 Spare
0
4 OSA Pre-Charge Timing
1
LRPC /(LRPC + PRPC)
5 OSA Pixel Rate Pre-Charge
0
Hi Duration
4 ns / 8 ns
6 OSA Pre-Charge Voltage
0
VDD / VDD - 0.5 V
7 VRT Voltage
0
2.5 V / 2.75 V
0
Internal test mode
0
Internal test mode
0
Internal test mode
0
0
0 - Line Rate Pre-Charge (LRPC)
1 - LRPC + PIx Rate Precharge
(PRPC)
0
0 - PRPC Width = 4 ns
1 - PRPC Width = 8 ns
0
0 - Pre-Charge Voltage = VDD
1 - Pre-Charge Voltage = VDD -
0.5 V
0
0 - VRT = 2.5 V
1 - VRT = 2.75 V
Table 6.30 : [120] - Analogue Test Register AT0
[121] - Microphone Amplifier Setup Register AT1
Bit
Function
3:0 Microphone Amplifier Gain
4 Digitise Microphone Amplifier Output
Off / On
5 Pad to supply analogue input to
Microphone amplifier
On / Off
6 Power down microphone amplifier
Off / On
Default
0
0
0
0
Comment
See Table 6.32
If this bit is selected, the ADC will
convert the output from the microphone
amplifier
If this bit is1, the pad will supply a signal
holdpix which will inhibit the ADC
operating. If this bit is 0, the holdpix
input is connected to the input of the
microphone amplifier
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VV5409 CMOS Monochrome Sensor Datasheet (Restricted) Rev 1.0
Bit
Function
Default
Comment
7 Microphone Amplifier Digitisation Mode
EAV / Always
0
Digitise the MicrophoneMicrophone
output, either only during the end of
active video embedded escape
sequence, or always
Table 6.31 : [121] - Microphone Amplifier Setup Register AT1
The register values shown in Table 6.32 correspond to actual gain values, where Actual gain = Vout/Vin.
Register: at1 on VV5409. Default is 15.
Gain register 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Actual gain 1 2 4 8 2 4 8 16 4 8 16 32 8 16 32 64
Table 6.32 : Audio Gain register Settings
6.7 Types of serial interface messages
This section gives guidelines on the basic operations of reading data from, and writing data to, the serial-
interface.
The serial-interface supports variable length messages. A message may contain no data-bytes, one data-
byte, or many data-bytes. This data, can be written to, or read from common, or different locations within the
sensor. The range of instructions available are detailed below.
• Write no data-byte, only sets the index for a subsequent read message
• Single location, multiple data write, or read for monitoring (real time control)
• Multiple location, multiple data read, or write, for fast information transfers.
Examples of these operations are given below. A full description of the internal registers, is given in the
previous section. For all examples, the slave address used is 3210 for writing, and 3310 for reading. The write
address includes the read/write bit (the lsb), set to zero while this bit is set in the read address.
6.7.1 Single location, single data write
When a random value is written to the sensor, the message will look like this:
Device
Start address Ack
Index
Data
Stop
S
2010
A0
3210
A
8510
AP
Figure 6.4 : Single location, single write
In this example, the fineH exposure register (index = 3210), is set to 8510. The r/w-bit is set to zero for writing,
and the inc bit (msbit of the index byte), is set to zero, to disable automatic incrementation of the index after
writing the value. The address index is preserved and may be used by a subsequent read. The write message
is terminated with a stop condition from the master.
Commercial In Confidence
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08/10/98
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