at42qt1070 ATMEL Corporation, at42qt1070 Datasheet - Page 20

• Manufacturer Part Number: at42qt1070
• Description: Qtouch 7-channel Sensor Ic
• Manufacturer: ATMEL Corporation

5.4
5.5
5.6
5.7
20
Address 2: Detection Status
Address 3: Key Status
Address 4 – 17: Key Signal
Address 18
AT42QT1070
–
31: Reference Data
Table 5-4.
Table 5-5.
Table 5-6.
Table 5-7.
CALIBRATE: This bit is set during a calibration sequence.
OVERFLOW: This bit is set if the time to acquire all key signals exceeds 8 ms.
TOUCH: This bit is set if any keys are in detect.
KEY0 – 6: bits 0 to 6 indicate which keys are in detection, if any. Touched keys report as 1,
untouched or disabled keys report as 0.
KEY SIGNAL: addresses 4 – 17 allow key signals to be read for each key, starting with key 0.
There are two bytes of data for each key. These are the key’s 16-bit key signals which are
accessed as two 8-bit bytes, stored MSByte first. These addresses are read-only.
REFERENCE DATA: addresses 18 – 31 allow reference data to be read for each key, starting
with key 0. There are two bytes of data for each key. These are the key’s 16-bit reference data
which is accessed as two 8-bit bytes, stored MSByte first. These addresses are read-only.
Address
Address
Address
Address
20 – 31
6 – 17
18
19
3
4
5
2
Reserved
CALIBRATE OVERFLOW
Detection Status
Key Status
Key Signal
Reference Data
b7
b7
b7
b7
KEY6
b6
b6
b6
b6
MSByte/LSByte OF REFERENCE DATA FOR KEYS 1 – 6
MSByte/LSByte OF KEY SIGNAL FOR KEYS 1 – 6
MSByte OF REFERENCE DATA FOR KEY 0
LSByte OF REFERENCE DATA FOR KEY 0
KEY5
MSByte OF KEY SIGNAL FOR KEY 0
b5
b5
LSByte OF KEY SIGNAL FOR KEY 0
b5
b5
–
KEY4
b4
b4
b4
b4
–
KEY3
b3
b3
b3
b3
–
KEY2
b2
b2
b2
b2
–
KEY1
b1
b1
b1
b1
–
9596A–AT42–10/10
TOUCH
KEY0
b0
b0
b0
b0