at42qt2100 ATMEL Corporation, at42qt2100 Datasheet - Page 27

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

5.4
5.4.1
5.4.2
9554CX–AT42–11/11
“Send Debug Data”
Introduction
Host Data
In a “Send Debug Data” exchange (Req = 001) the host requests the QT2100 to send 16-bit
debug data on the next 3-byte exchange.
In “Send Debug Data” command mode the host sends the 3-byte data in
Table 5-9.
Byte 0
Byte 1
Table 5-10.
Note:
Host
Byte
Debug Data: 1 bit, specifying the debug data that should be returned. Either of two 16-bit
debug data states may be requested:
Req: Set to 001 to indicate “Send Debug Data” command mode.
Channel: 4 bits indicating the measurement channel for which the “Send Debug Data” is
requested. Channels are mapped to keys or slider/wheel electrodes, as in
0
1
2
Channel
Debug Data = 0: Reference – the reference level used by the QT2100 for comparison
with the current measurements to detect touch. The reference value is a 16-bit
unsigned integer.
Debug Data = 1: Delta – the difference between the reference level and the current
level, indicating how close the channel is to detecting touch. The delta value is a 16-bit
signed integer.
Bits labelled “0” should not be altered
0
1
2
3
4
5
6
7
8
9
“Send Debug Data” Command Mode – Host Command Bytes
Channel Mappings
7
0
0
Req = 001
Sensing Object
Key B1
Key B2
Key B3
Key B4
Key B5
Key B6
Key B7
Slider/Wheel A1
Slider/Wheel A2
Slider/Wheel A3
6
0
0
5
0
0
4
0
0
0
Bit
3
0
0
2
0
0
Channel
AT42QT2100
Table
Table
1
0
0
5-9.
5-10.
Debug
Data
0
0
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