at42qt2100 ATMEL Corporation, at42qt2100 Datasheet - Page 21

• Manufacturer Part Number: at42qt2100
• Description: Qtouch Touch Sensor Ic
• Manufacturer: ATMEL Corporation

9554CX–AT42–11/11
Byte 0
Table 5-2.
Byte 1
Table 5-3.
AKS – Three bits used to determine the AKS mode, as shown in
Section 4.3.4 on page 15
SLD – Scrolling device type selection.
PROX – This setting is included to ensure compatibility with host drivers designed for the
QT1106. Any key may be optimized as a proximity sensor but key 7 should be used in any
application where AKS is required, as it can be excluded from AKS by selecting AKS mode
101.
Req – Set to 000 to indicate “Normal Exchange” mode.
LP Mode – After each measurement and processing cycle the device goes to sleep for a
period, the duration of which is set by the LP mode as per
LP Mode Bits
AKS Bits
SLD = 0: Wheel mode (default)
SLD = 1: Linear slider mode
000
001
010
011
100
101
000
001
010
011
100
AKS Mode
Sleep/Low Power Modes
AKS Option
AKS disabled (default)
AKS global: All 7 keys + slider/wheel are in the same group
AKS group 1: all keys
AKS group 2: slider/wheel
AKS group 1: keys 1 – 4
AKS group 2: keys 5 – 7
AKS group 3: slider/wheel
AKS group 1: keys 1 – 4
AKS group 2: keys 5 – 7 + slider/wheel
AKS group 1: keys 1 – 6 + slider/wheel
AKS group 2: key 7
Operating Mode
Free run – 0 ms sleep period in each cycle (default):
Acquisition and processing carried out continuously with no sleep. This mode
has the highest power consumption, but the quickest response.
60 ms sleep period in each cycle
120 ms sleep period in each cycle
240 ms sleep period in each cycle
480 ms sleep period in each cycle
for further information).
Table
5-3.
AT42QT2100
Table 5-2
(see
21