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AT90SCR100 Datasheet(PDF) 206 Page - ATMEL Corporation

Part # AT90SCR100
Description  8-bit Microcontroller for Smart Card Readers
PDF  433 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90SCR100 Datasheet(HTML) 206 Page - ATMEL Corporation

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TPR0327AY–SMS–30Jan09
AT90SCR100
Figure 17-1.
USB Smart Card Interface Block Diagram
17.3
USB-IC Design
Regarding the USB-IC specifications, the AT90SCR100 pads are not exactly compliant, as they
do not include pull-down resistors of 30-150 K
Ω.
Designing a specific USB-IC system will thus require to connect 2 pull-down resistors on CC4
and CC8 pins.
Another external component will also be mandatory, to control the attachement of these pull-
down resistors, as described in the USB-IC specifications. That is why this design will require the
use of another pin to control a commutator that will attach the pull-down resistors or not.
Please refer to the USB-IC specification for details about the need of control.
TBD: references of components to achieve such functionnalities.
Logical D+
Logical D-
USB Smart Card
Interface
CPU
Internal Vcc
(SRAM)
USB Host
Controller
UHCR.PAD
CC4
CC8
= '01'
= '01'
UHCR.UHEN=1
SCIB
Controller
USB-IC Pad
UHCR.PAD
UHCR.UHEN=1
D+
D-
D+
CC4
CC4
CC8
CC8
D-
15K
15K
= '00'
= '00'
USB 2.0
clk
USB
On-Chip USB DPRAM
Pipe 0
168 Bytes
Pipe 1
Pipe 2
Pipe 3
USB Regulator
DC/DC



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