AT43USB326-AU Atmel, AT43USB326-AU Datasheet - Page 15
AT43USB326-AU
Manufacturer Part Number
AT43USB326-AU
Description
IC USB KEYBOARD CTRLR 48LQFP
Manufacturer
Atmel
Series
AVR®r
Datasheet
1.AT43USB326-AC.pdf
(102 pages)
Specifications of AT43USB326-AU
Applications
Keyboard Controller
Core Processor
AVR
Program Memory Type
Mask ROM (16 kB)
Controller Series
AT43USB
Ram Size
512 x 8
Interface
USB
Number Of I /o
32
Voltage - Supply
4.4 V ~ 5.25 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
48-LQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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USB Hub
USB Function
3313D–USB–04/06
A block diagram of the USB hardware of the AT43USB326 is shown in Figure 3. The USB hub
of the AT43USB326 has 3 downstream ports. The embedded function is permanently attached
to Port 1. Ports 2 and 3 are available as external ports. The actual number of ports used is
strictly defined by the firmware of the AT43USB326 and can vary from 0 to 2. Because the
exact configuration is defined by firmware, ports 2 and 3 may even function as permanently
attached ports as long as the Hub Descriptor identifies them as such.
The embedded USB function has its own device address and has a default endpoint plus 2
other programmable endpoints with their own 8-byte FIFOs. Endpoints 1 and 2 can be pro-
grammed as interrupt IN or OUT or bulk IN or OUT endpoints.
AT43USB326
15
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