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ST7265X bảng dữ liệu(PDF) 34 Page - STMicroelectronics

tên linh kiện ST7265X
Giải thích chi tiết về linh kiện  LOW-POWER, FULL-SPEED USB 8-BIT MCU WITH 32K FLASH, 5K RAM, FLASH CARD I/F, TIMER, PWM, ADC, I2C, SPI
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST7265X bảng dữ liệu(HTML) 34 Page - STMicroelectronics

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POWER SUPPLY MANAGEMENT (Cont’d)
6.4.2.1 Switching from Stand-Alone Mode to
USB Mode
In Stand-Alone Mode, when the user plugs in the
USB cable, 4V min. is input to USBVDD. The on-
chip power Supply Manager generates an internal
interrupt when USBVDD reaches USBVIT+ (if the
PLGIE bit in the PCR register is set). The user pro-
gram then can finish the current processing, and
MUST generate a software RESET afterwards.
This puts the microcontroller into reset state and
all I/O ports go into input high impedance mode.
During and after this (software induced) reset
phase, the USBEN pin is set to output low level by
hardware. This causes the USB SWITCH to be
turned ON. Consequently, VDD pin is powered by
USBVDD supply. See Figure 24.
Once in USB mode, no power is drawn from the
step-up converter output.
For more details, refer to Figure 25.
Figure 24. External Power Supply Switch
VDD1
USB SWITCH
VDD2
VDDA
USBVDD
USBEN
ST7
(True OD, H/W crtl)
Step-up converter
4V min. from USB
Note 1: Ground lines not shown
PCR REGISTER
PLG
General Purpose I/O (I/O port DR, DDR)
Option bit
USBEN H/W
CONTROL
USBVIT-
USBVIT+
USBVIT-
PLG bit
USBVDD
Alternate Function (USBEN)
PMOS
VITPF
USBVIT+
VITMF Bit
VITPF Bit
PLGIE
VITMF
Interrupt Request
RESET
LOGIC
S/W RESET
EDGE DETECTOR
USB VOLTAGE
DETECTOR
WITH LATCH
DETEN
(Note 2)
Note 2: Suggested device: IRLML6302 (International
rectifier) or Si230DS (Siliconix)
1



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