qt1100a Quantum Research Group, qt1100a Datasheet - Page 23

• Manufacturer Part Number: qt1100a
• Description: 10 Key Qtouch? Sensor Ic
• Manufacturer: Quantum Research Group

Table 3-1 Control Commands
Commands are divided into two types: Control commands, which force the device into various modes or are used for serial communications management, and Status commands
which report back with information about the device or the sensing process.
LQ
Hex
0x00
0x01
0x02
0x03
0x04
0x05
0x1k
Page
16
17
18
18
18
18
18
CAL key ‘k’
CAL ALL
SETUPS
Name
RESET
SLEEP
NULL
RUN
Used to get data back in SPI mode
Enter Setups mode and stop sensing, followed by block
load of binary Setups data from host. Command must
be repeated 2 times within 100ms or it will fail. Returns
with 0x53 when ready to accept block.
Enter RUN mode without benefit of calibration.
Command must be repeated 2 times within 100ms to
execute or it will fail.
Force device to enter Cal mode to recalibrate all keys;
enters RUN mode afterwards automatically. Command
must be repeated 2 times within 100ms to execute or it
will fail.
Force device to reset. Sends back ‘0xFB’ to
acknowledge prior to reset. Command must be
repeated 2 times within 100ms to execute or it will fail.
Enter sleep. Command must be repeated 2 times within
100ms to execute or it will fail.
Force calibration of key #k where k= 0..9
Command must be repeated 2 times within 100ms to
execute or it will fail.
Description
Command
Bytes per
23
1
2
2
2
2
2
2
Returned
0 in UART
1 in SPI
Bytes
2
1
1
1
2
1
0xFA + 0x05
0xFE, 0xF0,
0xF1, 0xF2
Return
Range
0..0xFF
0x53 +
0xFD
0xFC
0xFB
0xF8
SPI mode: Flushes pending data from QT1100A.
UART mode: Serves no function and evokes no response
Returns 0x53 after second 0x01 is received.
During or after block load; returns 0xFE if pass, or, 0xF0 if
CRC fail, or, 0xF1 if 100ms timeout between bytes, or,
0xF2 if EEPROM programming failed.
Returns 0xFD after the second 0x02 is received.
Returns 0xFC after second 0x03 is received.
Check on progress of each key using 0x8k commands.
Returns 0xFB to acknowledge command, then resets
device. After reset, part restarts, recalibrates, and runs
automatically (same as any other type of reset).
Returns 0xFA to acknowledge command; sleeps in low
power mode, wakes on WAKE pin; returns 0x05 after wake.
Used in normal running mode to calibrate one specific key.
Normal sensing of other keys not affected. Calibration
takes place in the key’s normal timeslot. Returns 0xF8 to
acknowledge command was received and the requested
calibration will take place.
Copyright © 2003-2005 QRG Ltd
QT1100A-ISG R3.02/1105
Notes