ATSAM3S-EK Atmel, ATSAM3S-EK Datasheet - Page 928
![no-image](/images/manufacturer_photos/0/0/78/atmel_sml.jpg)
ATSAM3S-EK
Manufacturer Part Number
ATSAM3S-EK
Description
KIT EVAL FOR ATSAM3S4C
Manufacturer
Atmel
Series
SAM3Sr
Type
MCUr
Specifications of ATSAM3S-EK
Contents
Board, Cables, Power Supply
Silicon Manufacturer
Atmel
Core Architecture
ARM
Core Sub-architecture
Cortex-M3
Kit Contents
Board
Features
TFT Colour LCD Display, SD/MMC Interface
Svhc
No SVHC (15-Dec-2010)
Rohs Compliant
Yes
For Use With/related Products
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATSAM3S-EK
Manufacturer:
Atmel
Quantity:
135
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- Download datasheet (24Mb)
37.5
37.5.1
37.5.2
928
Typical Connection
SAM3S Preliminary
USB Device Transceiver
VBUS Monitoring
Figure 37-2. Board Schematic to Interface Device Peripheral
The USB device transceiver is embedded in the product. A few discrete components are
required as follows:
VBUS monitoring is required to detect host connection. VBUS monitoring is done using a stan-
dard PIO with internal pull-up disabled. When the host is switched off, it should be considered as
a disconnect, the pull-up must be disabled in order to prevent powering the host through the pull-
up resistor.
When the host is disconnected and the transceiver is enabled, then DDP and DDM are floating.
This may lead to over consumption. A solution is to enable the integrated pull-down by disabling
the transceiver (TXVDIS = 1) and then remove the pull-up (PUON = 0).
A termination serial resistor must be connected to DDP and DDM. The resistor value is defined
in the electrical specification of the product (R
• the application detects all device states as defined in chapter 9 of the USB specification;
• to reduce power consumption the host is disconnected
• for line termination.
PIO
DDM
DDP
– VBUS monitoring
5V Bus Monitoring
47 K
27 K
R
R
EXT
EXT
EXT
).
2
3
Connector
6500C–ATARM–8-Feb-11
Type B
1
4
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