qt60325 Quantum Research Group, qt60325 Datasheet - Page 29

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

Uppercase 'V'. This get-only command returns the part
version number.
There is no put version of the command.
Section 3.1, p. 9
Uppercase 'W'. This get-only command returns the part
signature as follows:
There is no put version of this command.
Section 3.17, p. 14
Uppercase 'Z'. This put-only command forces the device to
enter sleep mode. The command 0x5A must be followed only
by a null (0x00) within 100ms or the command will fail.
The command returns 0x5A immediately before going to
sleep, and a second 0x5A upon waking up. The part must be
in Put mode for this command to work.
If for some reason the device is unable to echo back the first
‘Z’ character, for example due to the host not releasing the
SS line, the part will completely reset after about 2 seconds.
The part will reawaken after a logic low is detected for >10µs
on pin 11 (X2WS pin, see Section 3.17, p. 14). The device
then sends the second ‘Z’ back to the host, and resumes
from its prior state before it went to sleep without the need for
recalibration.
The device always reawakens in Get mode.
There is no get version of the ‘Z’ command.
Section 4, p. 16
Ctrl-Q. This command sets the communications clock rate of
the SPI interface in Master mode. The acceptable values of
the 2nd byte are:
The part must be in Put mode for this command to work.
lQ
^Q
V
W
Z
Put
Get
Put
Get
Put
Get
Put
Get
0x20
0x30
0x40
0:
1:
2:
3:
0x5A - E
0x56 - R
0x57 - R
0x11 - D
46.875 kHz {factory default}
93.75 kHz
375 kHz
1.5 MHz
Scope
Scope
Scope
Scope
n/a
n/a
n/a
n/a
(32 decimal) - for QT60325
(48 decimal) - for QT60485
(64 decimal) - for QT60645
n/a
n/a
n/a
n/a
ETURN
NTER
ETURN
ATA
Bytes / Cmd
R
S
Bytes / Cmd
Bytes / Cmd
Bytes / Cmd
P
LEEP
ATE
P
ART
ART
n/a
1
n/a
n/a
1
2
2
1
S
V
ELECTION
S
ERSION
IGNATURE
# Bytes Rtnd
2nd Byte Range
2nd Byte Range
# Bytes Rtnd
0x00..0x03
n/a
1
0x00
n/a
n/a
n/a
1
0x20, 0x30, 0x40
© Quantum Research Group Ltd.
Returns
*0x5A, 0x5A
0x00..0xFF
0x00..0x03
Returns
Returns
Returns
n/a
0x11
n/a
n/a
29
Note that when the part is in Slave mode, the host can clock
data to the device at rates up to 1.5MHz even if the setting of
^Q is slower.
New settings do not become effective until the device has
been powered off and back on again or after the reset (‘r’)
command.
Refer to Sections 4.3 and 4.4 for specific timing details.
Section 3.20, p. 15
Ctrl-R. In Put mode, controls the oscilloscope sync function
of Pin 37. The settings of this function are:
When on, Pin 37 outputs a pulse that brackets the acquire
burst(s) for the keys targeted by scope. Without this it is
virtually impossible to view signals corresponding to a specific
key.
Pin 37 idles low and pulses high during a sync pulse. Pin 37
is also used for SPI mode selection by connecting to +5 or
Ground, and as a result if ^R is used, Pin 37 should never
be clamped to a supply rail but rather connected via a 10K
resistor to prevent a short circuit. See Section 3.20.
^R is volatile, that is, it does not persist after a power down.
Section 3.19, p. 15
Ctrl-S. Controls the polarity of the Cs Clamp line, CSR, pin
35, using the 2nd byte as follows:
The part must be in Put mode for this command to work.
This pin controls the polarity of the reset signal applied to the
charge integrator reset switch. In systems using an n-channel
switch (active-high required to reset the Cs capacitor), this
option should be set to ‘1’; for a p-channel mosfet switch in
bipolar supply systems requiring an active-low to reset the Cs
capacitor, ^S should be set to ‘0’. For the reference circuit of
Figure 3-1 this should be set to ‘0’ (the default); for the circuit
of Figure 3-2 this should be set to ‘1’..
The setting of ^S does not become effective until the device
has been powered off and back on again or after the reset
(‘r’) command has been issued.
^R
^S
Get
Get
Put
Put
0:
1:
0:
1:
0x13 - C
0
X
off {factory default}
on
active-low
active-high
12 - O
1, 8, 64
1, 8, 64
Scope
Scope
-
-
S
SCILLOSCOPE
C
LAMP
Bytes / Cmd
Bytes / Cmd
www.qprox.com
P
2
1
2
1
OLARITY
S
YNC
2nd Byte Range
2nd Byte Range
0x00, 0x01
0x00, 0x01
n/a
n/a
QT60xx5 / R1.05
0x00, 0x01
0x00, 0x01
Returns
Returns
0x12
0x13