at42qt1481 ATMEL Corporation, at42qt1481 Datasheet - Page 35

• Manufacturer Part Number: at42qt1481
• Description: 48-key Qmatrix Ic
• Manufacturer: ATMEL Corporation

Figure 4-1.
9621B–AT42–06/11
NOTE: CRC errors or incorrect
responses should cause each
transmission to retry
Internal Host
Comms with
Processes
Power On or Hardware Reset
0xF0 not
returned
QT
Suggested Communications Flow
'Last command'
~10 ms Delay
0x0F
Get
Keys OK
Only 1 Key
returned
in Detect
0xF0
no error
Done
No key,
Key Detection(s) Processing
CRC is OK
Device Overview
Setups CRC
detections
Cal Key 'k'
Report all
Check
0x0E
0x06
0x07
0xck
Stuck Key
Detected
> 1 Key
Detected
Setups CRC
failed once
Setups CRC failed twice
Any Error Flag, or
EN60730 counter
sequence error
Safe Shutdown
Load Setups
EEPROM CRC error, or
calibration fail, or
Block
EN60730 error, or
FMEA error
0x01
multiple errors
FMEA fail, or
Error Handling
Calibration
AT42QT1481
Errors for All
Error
0x0B
Keys
Get
Force Reset
0x04
resolvable
error
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