at42qt1481 ATMEL Corporation, at42qt1481 Datasheet - Page 37

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

Table 4-5.
Hex
0x06
0x07
0x0B
0x0D
0x0E
0x0F
0x10
0x13
0x16
Name
Return last command Returns last command received
Return internal code
Return internal code
QT1481 Overview
Error flags for all
Report all keys
EEPROM CRC
Dump Setups
Command Summary (Continued)
Sleep
Device status, indication of first key
touched, EN60730 counters.
Sends back all key detect status bits
(bit-field)
Returns Setups block area followed
by CRC. Scanning is halted and then
autorestarted after the command has
completed.
Gets EEPROM CRC
Diagnostic code for factory use.
Diagnostic code for factory use.
Enter sleep at end of each matrix
scan if no activity and if sleep is also
enabled in Setups
Description
Error bit fields
#/Cmd
1
1
1
1
1
1
1
1
1
# Rtnd
nn+2
7
8
8
2
1
3
3
1
Rtn Range
0 – 0xFFFF
nn+2 bytes
each byte
0 – 0xFF
0 – 0xFF
0 – 0xFF
0 – 0xFF
0 – 0xFF
0 – 0xFF
0 – 0xFF
6 bytes
6 bytes
0xE9
CRC
16
16
16
16
16
16
–
–
–
Description
Returns 5 individual data bytes in following
sequence:
16-bit CRC (of command + return data) is
appended to return
16-bit CRC (of command + return data) is
appended to return
16-bit CRC (of command + return data) is
appended to return
Dump of fixed length ‘nn’ followed by CRC-16
CRC is same as CRC at end of Setups block
load.
LSL and CRC words are sent back to host low
byte first.
In UART mode, part times out if each byte not
transmitted within 110 ms of previous byte. This
can happen if DRDY is driven by the host.
In SPI mode, the entire command must be
completed within 110 ms.
CRC-16 only on Setups block
This CRC is the same as the CRC at the end of
Setups block load. This word is returned low byte
first.
Returns 1's complement of last command even if
bad
Returns internal code. 16-bit CRC (of command +
return data) is appended to return
Returns internal code. 16-bit CRC (of command +
return data) is appended to return
Returns 1's complement of command to
acknowledge; wakes on INT to scan matrix before
returning to sleep. Sleep disabled on receipt of
any other valid command.
Device Status
1st key (range 0 – 47)
100 ms Counter (host must read for EN60730
compliance)
Matrix Scan Counter (host must read for
EN60730 compliance)
Signal Fail Counter (host must read for
EN60730 compliance)
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