參數(shù)資料
型號： ST7265
英文描述： ST7 - LOW-POWER. FULL-SPEED USB 8-BIT MCU WITH 32K FLASH. 5K RAM. FLASH CARD I/F. TIMER. PWM. ADC. I2C
中文描述： ST7的-低功耗。全速USB 8位32K快閃微控制器。 5K內(nèi)存。閃存卡的I /樓計時器。脈寬調(diào)制。 ADC的。的I2C
文件頁數(shù)： 98/166頁
文件大?。?/td> 2089K
代理商： ST7265
ST7265x
37/166
POWER SUPPLY MANAGEMENT (Cont’d)
6.4.3 Storage Media Interface I/Os
The microcontroller is able to drive Storage Media
through an interface operating at a different volt-
age from the rest of the circuit.
This is achieved by powering the Storage Media
interface I/O circuitry through a specific supply rail
connected to VDDF pin. The VDDF pin can be used
either as an input or output.
If the on-chip voltage regulator is off, power to the
interface I/Os should be provided externally to the
VDDF pin. This should be the case when in Stand-
Alone Mode, or in USB mode when the current re-
quired to power the Storage Media is above the
current capacity of the on-chip regulator.
If the on-chip voltage regulator is on, it powers the
interface I/Os, and VDDF pin can supply the Stor-
age Media. This is recommended in USB Mode,
when the current required to power the Storage
Media is within the capacity of the on-chip regula-
tor.
Application Example:
Stand-Alone Mode
– The Storage Media interface supply is powered
by VDD enabled by an external switch (see Fig-
ure 26) which connects VDD to VDDF. This switch
can be driven by any True Open Drain I/O pin
and controlled by user software.
– The on-chip voltage regulator must be disabled
to avoid any conflict and to decrease consump-
tion (reset the REGEN bit in the PCR register).
USB Mode
– In this case the core of the microcontroller is run-
ning from the USB bus power or the self power
supply. VDD and USBVDD pins are supplied with
a voltage from 4.0 to 5.5V.
– The Storage Media Interface can be powered
through the on-chip regulator (providing power to
the I/O pins and output on pin VDDF) if the current
requirement is within the output capacity of the
on chip regulator.
– The regulator output voltage can be pro-
grammed to 2.8V, 3.3V, 3.4V or 3.5 Volts, de-
pending on the Storage Media specifications.
(see VSET[1:0] bits in PCR register description)
– Should the current requirement for the Storage
Media be higher than the current capacity of the
on chip regulator, an external regulator should be
used (See Figure 27). Thus the on-chip voltage
regulator must be disabled to avoid any conflict
(reset the REGEN bit in the PCR register).
Caution: The user should ensure that VDD does
not exceed the maximum rating specified for the
Storage Media VDDF max when switching STOR-
AGE switch on.
1
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