參數(shù)資料
型號： ST72651AR6T1E/XXX
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, MICROCONTROLLER, PQFP64
封裝： 10 X 10 MM, ROHS COMPLIANT, TQFP-64
文件頁數(shù)： 91/161頁
文件大?。?/td> 2656K
代理商： ST72651AR6T1E/XXX
ST72651AR6
35/161
Doc ID 7215 Rev 4
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.
Caution: If VDDF is supplied externally, the regu-
lator must not be enabled.
Important Note:
If VDDF is not present, all VDDF-driven I/Os cannot
be used and are tied to ground. Refer to Section
9.2.4 for more details.
Application Example:
Stand-Alone Mode
– The Storage Media interface supply is powered
by VDD enabled by an external switch which con-
nects 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. 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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