AT43USB326-AC Atmel, AT43USB326-AC Datasheet - Page 84

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

Specifications of AT43USB326-AC

• 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: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Typical
Application
Detailed
Description
Mask Bits
84
AT43USB326
The Atmel sample version of the AT43USB326 contains firmware that supports customization
of the Vendor ID, Product ID, String Descriptor and the keyboard matrix. This information is
stored in an external AT24C02A serial EEPROM. Data in the EEPROM is stored in the follow-
ing format:
The mask bits identify what features are stored in the EEPROM. A “1” in the mask bit location
means that the feature is stored and should be read. A “0” means that the feature is not stored
and should not be read.
Address Range
0x00 - 0x01
0x02 - 0x03
0x04 onwards
0x70 - 0xFF
Address Location
0x00
0x01
Address Location
0x02
0x03
Remark
Mask 2 - Reserved for Future Use
Mask 1
Bit 7: Keyboard Matrix
Bit 6: Reserved
Bit 5: Extra Hot Key Codes
Bit 4: Serial Number String
EEPROM's signature
Mask Bits
Initial Check Byte
Keyboard matrix
Value/Content
0x17
0x5A
Content
VID, PID and strings
Bit 3: Product String
Bit 2: Manufacturer String
Bit 1: Language String
Bit 0: VID, PID, Version
3313D–USB–04/06