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VV6501 датащи(PDF) 24 Page - STMicroelectronics

номер детали VV6501
подробное описание детали  VGA CMOS Color Image Sensor
PDF  60 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VV6501 датащи(HTML) 24 Page - STMicroelectronics

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Functional Description
VV6501
24/60
3.3
Power management
3.3.1
Voltage regulators
The power management block on the device avoids the requirement for any external system
regulators in a 5 V based camera product. The scheme is shown in
Figure 19.
q
Digital Regulator 1 - This 5 V to 3.3 V regulator uses an external bipolar transistor to supply
loads up to 200 mA. It is typically used to power the sensor digital logic and may also be used
to supply an external co-processor if required. This regulator is always on.
q
Digital Regulator2 - This 3.3 V to 1.8 V regulator uses an external bipolar transistor to supply
loads up to 100 mA. This supply may be used for an external co-processor if required. This
regulator is controlled by the PDREG1V8 pin and must be switched off if not required.
q
Audio Amp Regulator - This 5 V to 3.3 V regulator supplies the audio amplifier and the buffer
amplifier used to supply the reference to the microphone (Load 5 mA). It should be externally
decoupled with a 2.2 µF capacitor. For applications without audio this regulator may be
powered down via the SIF registers.
q
Video Regulator - This 5 V to 3.3 V regulator supplies the analogue video circuitry. It should be
externally decoupled with a 2.2 µF capacitor.
Figure 19: Voltage regulator block diagram
PDREG1V8
10µF
5V
co-
vbg
5V
vbg
core (1v8)
IO (3V3)
1v8
3v3
Dig Reg1
5V Bandgap
+
-
VBASE3V3
VDIG3V3
V5V
4-5.5V
ZTX749
VBG
VDD
VDD
6.8nF
3V
vbg
Dig Reg2
+
-
pd
pdreg2
VDIG1V8
5V
vbg
VidReg
+
-
pd
VID3V3
pdvidreg
pdaudreg
5V
vbg
AudReg
+
-
pd
AUD3V3
VBASE1V8
10µF
1
µF
ZTX749
VV6501
Digital
block
Audio
amplifier
Voltage
doubler
Video
block
Power management block
2.2µF
2.2µF
processor



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