ST7265X データシートの表示（PDF） - STMicroelectronics
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ST7265X Datasheet PDF : 166 Pages
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ST7265x
POWER SUPPLY MANAGEMENT (Cont’d)
6.4.4 Power Management Application Example
In the example shown in Figure 28, the VDD supply
is provided by a step up. In this case the step up
must be capable of tolerating voltages up to 5.5V
on its Vout pin.
Figure 28. Dual Power Supply Application Example (low current Storage Media)
USBVDD Switch
USBVDD
=4.0-5.5V
USBVDD
USB port
4.7µF
USB
5V
VCC
DP
DP
DM
GND
DM
USB
GND
USB
USBEN
VDD
POWER
MANAGEMENT
50µH
1.2V
Step Up
10µF
DEC Switch
I/O
LOGIC
Audio
AMP
DAC
I2S
MPEG
Decoder
STA013
I2C
I2C
2
DTC
4
MP3
1.5Mbit/s Max
THRESH
REGULATOR
level translator
Cbus=40pF max
VDDF
KEYBOARD
LED
FLASH
VPP
12V for
Flash prog.
LCD DISPLAY
LIGHT
TDA7474
STORAGE
MEDIA
2M - 128MByte
100nF
STORAGE Switch
4.7µF
Vdd in Stand-Alone mode
Regulator output (2.8 - 3.5V) in USB mode
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