AT43USB326-AU Atmel, AT43USB326-AU Datasheet - Page 15

• Manufacturer Part Number: AT43USB326-AU
• Description: IC USB KEYBOARD CTRLR 48LQFP
• Manufacturer: Atmel
• Series: AVR®r

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

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
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