qt60325 Quantum Research Group, qt60325 Datasheet - Page 25

• Manufacturer Part Number: qt60325
• Description: 32, 48, 64 Key Qmatrix Keypanel Sensor Ics
• Manufacturer: Quantum Research Group

Section 2.3, p. 6
Ctrl-C. In Put mode, the command followed by a setting is
programmed into eeprom for all keys only. The value should
be from 0 to 3, representing hysteresis as follows:
Values other than the above will be rounded down.
The percentage is the distance from the threshold level to the
reference level. The hysteresis level is always closer to the
threshold point than to the reference point. 25% is a
reasonable value under most conditions.
As this parameter is common to all keys, Put and Get
operations send or return only one byte.
Section 2.3, p. 6
Ctrl-D. Identical in operation to ^C above except this applies
to positive 'detections' used to recalibrate the sensor (see ^B
above for details). Uses same hysteresis values as ^C above.
Sections 1.2, 3.3, 3.9, 3.13
Ctrl-E. Governs the delay from the rise of an X drive to the
termination of Y transfer gating ('dwell time').
This command is included for compatibility with future
versions. The device defaults to 1 (one) machine cycle of
dwell or 167ns with a 6MHz oscillator. Although the command
will be accepted, this setting cannot be changed.
The dwell time can be shortened below 167ns by an external
circuit as described in Section 3.9.
As this parameter is common to all keys, Put and Get
operations send or return only one byte, 0x01.
lQ
^C
^D
^E
Put
Get
Put
Get
Put
Get
0:
1:
2:
3:
0
0
0
X
X
X
05 - D
03 - N
04 - P
50%
25%
12.5%
0% (no hysteresis)
Scope
Scope
Scope
64
64
64
64
64
64
WELL
OSITIVE
EGATIVE
T
Bytes / Cmd
Bytes / Cmd
Bytes / Cmd
IME IN
T
T
HRESHOLD
HRESHOLD
2
1
2
1
2
1
M
ACHINE
Byte 2 Range
H
Byte 2 Range
Byte 2 Range
H
0x01..0x03
0x01..0x03
YSTERESIS
YSTERESIS
C
0x01
n/a
n/a
n/a
YCLES
© Quantum Research Group Ltd.
0x01..0x03
0x01..0x03
Returns
Returns
Returns
0x03
0x04
0x05
0x01
25
Section 3.6, p. 12
Ctrl-F. In Put mode the command sets the burst length of one
or more keys, according to the current scope. Valid decimal
values are:
Values other than the above will be rounded down.
In Get mode, the command will return a single byte according
to the rules of Section 5.2, page 21.
^F sets the length of the acquisition burst on a key by key
basis. This setting is directly proportional to signal gain. This
setup interacts with Negative and Positive Threshold (^A and
^B). Increasing ^F can allow for higher threshold levels and
more robust signals, at the expense of increased radiated
emissions and reduced Cx load capacity.
Special condition: If the value for ^F for a key is set to zero
the burst disabled and the key will not function; the key will
report back with an error code. The timing for the 'phantom
burst' will be preserved so that overall key scan timing will
remain unchanged.
Section 3.8, p. 12
Ctrl-G. In Put mode, sets the spacing between successive
acquire bursts for the entire matrix.
The second byte indicates the spacing to be set according to
the following values:
Values higher than the above will be truncated to 2000µs.
Longer delay times equate to slower acquisitions. At lower
delay times (faster rep rates) there can be conflicts with long
burst lengths which will prevent proper operation; see Section
5.7.
The time required to scan the entire keymatrix once is the
above delay multiplied by 64 regardless of the number of
keys actually used or the part model number.
Burst spacing also affects recalibration time; see Section 2.10
The scope for this function is always 'all keys'.
^F
^G
Get
Get
Put
Put
0
12 15 20 25 30 40 50 64
0:
1:
2:
3:
4:
5:
0
0
X
X
06 - B
07 - B
1
250µs
300µs
400µs
500µs
1000µs
2000µs
1, 8, 64
Scope
Scope
2
64
64
1
URST
URST
3
L
S
Bytes / Cmd
Bytes / Cmd
ENGTH
www.qprox.com
4
PACING
2
1
2
1
5
7
Byte 2 Range
Byte 2 Range
0x00..0x40
10
0x00..0x05
n/a
n/a
QT60xx5 / R1.05
0x00..0x40
0x00..0x05
Returns
Returns
0x06
0x07