at42qt1481 ATMEL Corporation, at42qt1481 Datasheet - Page 55

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

Table 5-4.
Note:
5.32
The STATUS pin can be used to indicate a variety of things in combination. The STS parameter controls which states make the STATUS pin active.
Table 5-5.
Bit
7
6
5
4
3
2
1
0
Byte
343
344
345
346
348
A CRC calculator for Microsoft
STS Bits
Frequency 0
Freq.Hop Mode
Detect Integrator
Multiplier
Frequency 1
Frequency 2
Noise Threshold
Noise Integrator
Limit
Setups CRC
Block length
Parameter
Name
STS_DEBUG
STS_KEYERROR
STS_TOUCH
Reserved
STS_SETUPS
STS_MSYNC
Reserved
STS_RSTHOST
Setups Block
Control Byte Bits
FREQ0
FHM
DIM
FREQ1
FREQ2
NSTHR
NIL
SCRC
Symbol
Bytes
®
350
Windows
1
1
1
1
2
STATUS output (active low)
1= STATUS output used for Debug. This bit cannot be used with any other
bit.
Active on any key error: (calibration failed, low signal)
Active on any change in touch status
Active on Setups CRC mismatch
Active on Mains sync error
Host watchdog – active if no host communications within any 2s period. Host
reset pulse length is 150 ms. The host watchdog is not enabled until the first
valid
command
Valid Range
®
0 – 65k
0 – 63
0 – 63
0 – 63
0 – 15
0 – 15
0 – 2
0 – 3
is available free of charge from Atmel, on request.
is received from the host.
Bits
16
6
2
2
6
6
4
4
Scope
device
Key
48
48
48
48
48
48
Default
Value Description
24
30
36
1
0
0
3
–
Bits 5 – 0 = Frequency 0. Default = 24 delay cycles
Bits 7, 6 = Frequency hop mode. Default = 1 (recalibrate after each hop)
Bits 7 – 6 = DIM. Default = 0 (x1)
Bits 5 – 0 = Frequency 1. Default = 30 delay cycles
Bits 5 – 0 = Frequency 2. Default = 36 delay cycles
Lower nibble = Noise Threshold. Default = 0 (5 counts)
Upper nibble = Noise Integrator Limit. Default = 3
CRC-16 of above setups, does NOT include CRC of command itself. The
low order byte should be sent first. See also CRC notes,
Default
0
0
1
–
0
0
–
0
Appendix
A.
Page
51
51
43
51
52
52
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53