Siemens S50037 ユーザーズマニュアル
SieMo S50037 Data Book
PRELIMINARILY
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USB Interface
Overview
12Mbits/s bit rate
BC01 operates as a peripheral USB
device
Two modes, bus powered and self
powered
Careful product design is required for
product to remain USB1.1 compliant
4 USB lines are required
Minimum voltage on VCC_IO terminal
is 3.0V for USB operation
The SieMo contains its own full-speed
(12Mbits/s) USB interface. To get a
product USB 1.1 certified, please visit
(12Mbits/s) USB interface. To get a
product USB 1.1 certified, please visit
for further information. The
voltage on Vcc-IO must be between 3.0
and 3.4 V for USB operation. It is possible
to connect the Vcc-IO to the Vreg output of
the module, which provides a regulated
voltage of 3.15V.
and 3.4 V for USB operation. It is possible
to connect the Vcc-IO to the Vreg output of
the module, which provides a regulated
voltage of 3.15V.
Although SieMo is capable of meeting the
USB 1.1 specification, Siemens cannot
guarantee that an application circuit
designed around the IC is USB compliant.
The choice of application circuit,
component choice and PCB layout all
affect USB signal quality and electrical
characteristics. The information in this
document is intended as a guide and
should be read in association with the
USB 1.1 specification, with particular
attention being given to Chapter 7.
Independent USB qualification must be
sought before an application is deemed
USB compliant and can bear the USB
logo. Such qualification can be obtained
from a USB plugfest or from an
independent USB test house.
USB 1.1 specification, Siemens cannot
guarantee that an application circuit
designed around the IC is USB compliant.
The choice of application circuit,
component choice and PCB layout all
affect USB signal quality and electrical
characteristics. The information in this
document is intended as a guide and
should be read in association with the
USB 1.1 specification, with particular
attention being given to Chapter 7.
Independent USB qualification must be
sought before an application is deemed
USB compliant and can bear the USB
logo. Such qualification can be obtained
from a USB plugfest or from an
independent USB test house.
Disconnect and Resume Signalling
SieMo provides some signalling lines for
USB operation. These functions are
disabled by default but can be activated
via firmware settings.
The USB_DETACH and USB_WAKE_UP
terminals provide extra signalling
alongside the normal USB data lines. They
are not part of the USB specification and
full USB functionality can be attained
without their use. The Disconnect
message may be useful on its own, but it
is hard to see an application for
USB_RESUME in isolation.
USB_DETACH (Disconnect Signalling)
USB_DETACH is an input, when asserted
high, causes SieMo to put
USB_PULL_UP, USB_D- and USB_D+ in
a high-impedance state. This detaches the
device from the bus and is logically
equivalent to unplugging the module.
When USB_DETACH is taken low, SieMo
will connect back to USB and await
enumeration by the USB host.
USB operation. These functions are
disabled by default but can be activated
via firmware settings.
The USB_DETACH and USB_WAKE_UP
terminals provide extra signalling
alongside the normal USB data lines. They
are not part of the USB specification and
full USB functionality can be attained
without their use. The Disconnect
message may be useful on its own, but it
is hard to see an application for
USB_RESUME in isolation.
USB_DETACH (Disconnect Signalling)
USB_DETACH is an input, when asserted
high, causes SieMo to put
USB_PULL_UP, USB_D- and USB_D+ in
a high-impedance state. This detaches the
device from the bus and is logically
equivalent to unplugging the module.
When USB_DETACH is taken low, SieMo
will connect back to USB and await
enumeration by the USB host.
USB_RESUME
USB_WAKE_UP is an active high output
used only when USB_DETACH is active to
wake-up the host and allow USB
communication to recommence. It
replaces the function of the USB Resume
message, which cannot be sent while
SieMo is effectively disconnected from the
bus.
USB_WAKE_UP is an active high output
used only when USB_DETACH is active to
wake-up the host and allow USB
communication to recommence. It
replaces the function of the USB Resume
message, which cannot be sent while
SieMo is effectively disconnected from the
bus.
Power Modes
SieMo is by default set to be powered from
the Bus. It can be set to a self powered
Device by changing firmware settings. In
this case the USB_ON must be connected
to the Vbus line via a 47k/22k
the Bus. It can be set to a self powered
Device by changing firmware settings. In
this case the USB_ON must be connected
to the Vbus line via a 47k/22k