AT43USB326-AU Atmel, AT43USB326-AU Datasheet - Page 85

• 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

Initial Check Byte
Keyboard Matrix
Example of
SEEPROM Data
3313D–USB–04/06
Address locations 0x04 through 0x6E store the VID, PID, Release Number and String
Descriptors if they are enabled by the mask bits in location 0x03. The data are stored sequen-
tially as described below:
Table 24. VID and PID
Table 25. Language ID and Strings
This check byte is located immediately after the last VID, PID or stings. It is computed as the
truncated sum of Mask1 and all the string length specified.
The keyboard matrix is 144 bytes. If specified, its check byte is located in address 0x6F while
the matrix itself is located from address 0x70 - 0xFF.
Table 26 through Table 34 illustrate the contents of a SEEPROM for a typical AT43USB326-
based keyboard.
Table 26. Preamble
Address
00
01
02
03
Length (N)
Byte 1
VID
0x70 = Col 0, Row 0
0x71 = Col 0, Row 1
.......
0x78 = Col 1, Row 0
0x79 = Col 1, Row 1
.....
0xF8 = Col 17, Row 0
0xF9 = Col 17, Row 1
.....
0xFF = Col 17, Row 7
Byte 2
Byte 1
VID
Byte 1
Byte 2
PID
Data
17
5A
00
BF
Byte 2
PID
Release #
Byte 1
Description
Fixed ID
Fixed ID
Reserved
Mask bits
AT43USB326
Byte N - 1
Release #
Byte 2
Check Byte
Check
Byte
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