© Quantum Research Group Ltd.
^C 0
X
03 - NEGATIVE
T
HRESHOLD
H
Bytes / Cmd Byte 2 Range
YSTERESIS
^F
0
X
06 - BURST
Scope
1, 8, 64
1
L
ENGTH
Scope
64
64
Returns
0x03
0x01..0x03
Bytes / Cmd Byte 2 Range
Returns
0x06
0x00..0x40
Put
Get
2
1
0x01..0x03
n/a
Put
Get
2
1
0x00..0x40
n/a
Section 2.3, p. 6
Section 3.6, p. 12
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:
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:
0: 50%
1: 25%
0
1
2
3
4
5
12 15 20 25 30 40 50 64
7
10
2: 12.5%
3: 0% (no hysteresis)
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.
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.
^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.
As this parameter is common to all keys, Put and Get
operations send or return only one byte.
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.
^D 0
X
04 - POSITIVE
T
HRESHOLD
H
Bytes / Cmd Byte 2 Range
YSTERESIS
Scope
64
64
Returns
0x04
0x01..0x03
Put
Get
2
1
0x01..0x03
n/a
Section 2.3, p. 6
^G 0
X
07 - BURST
SPACING
Bytes / Cmd Byte 2 Range
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.
Scope
64
64
Returns
0x07
0x00..0x05
Put
Get
2
1
0x00..0x05
n/a
Section 3.8, p. 12
^E 0
X
05 - DWELL
T
IME IN
M
Bytes / Cmd Byte 2 Range
ACHINE
C
YCLES
Scope
64
64
Returns
0x05
0x01
Ctrl-G. In Put mode, sets the spacing between successive
acquire bursts for the entire matrix.
Put
Get
2
1
0x01
n/a
The second byte indicates the spacing to be set according to
the following values:
Sections 1.2, 3.3, 3.9, 3.13
0: 250µs
1: 300µs
2: 400µs
3: 500µs
4: 1000µs
5: 2000µs
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.
Values higher than the above will be truncated to 2000µs.
The dwell time can be shortened below 167ns by an external
circuit as described in Section 3.9.
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.
As this parameter is common to all keys, Put and Get
operations send or return only one byte, 0x01.
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'.
lQ
25
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