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AT42QT1070-SSUR

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34
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AT42QT1070 [DATASHEET]
9596C–AT42–05/2013
5.2 Address 0: Chip ID
MAJOR ID: Reads back as 2
MINOR ID: Reads back as E
5.3 Address 1: Firmware Version
FIRMWARE VERSION: this shows the 8-bit firmware version 1.5 (0x15).
41 AVE/AKS key 2 Adjacent key suppression level for key 2
R/W
42 AVE/AKS key 3 Adjacent key suppression level for key 3
R/W
43 AVE/AKS key 4 Adjacent key suppression level for key 4
R/W
44 AVE/AKS key 5 Adjacent key suppression level for key 5
R/W
45 AVE/AKS key 6 Adjacent key suppression level for key 6
R/W
46 DI key 0 Detection integrator counter for key 0
R/W
47 DI key 1 Detection integrator counter for key 1
R/W
48 DI key 2 Detection integrator counter for key 2
R/W
49 DI key 3 Detection integrator counter for key 3
R/W
50 DI key 4 Detection integrator counter for key 4
R/W
51 DI key 5 Detection integrator counter for key 5
R/W
52 DI key 6 Detection integrator counter for key 6
R/W
53 FO/MO/Guard No FastOutDI/ Max Cal/Guard Channel
R/W
54 LP Low Power (LP) Mode
R/W
55 Max On Duration Maximum On Duration
R/W
56 Calibrate Calibrate
R/W
57 RESET RESET
R/W
Table 5-1. Internal Register Address Allocation (Continued)
Address Use Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 R/W
Table 5-2. Chip ID
Address b7 b6 b5 b4 b3 b2 b1 b0
0 MAJOR ID MINOR ID
Table 5-3. Firmware Version
Address b7 b6 b5 b4 b3 b2 b1 b0
1 FIRMWARE VERSION
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AT42QT1070 [DATASHEET]
9596C–AT42–05/2013
5.4 Address 2: Detection Status
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.
5.5 Address 3: Key Status
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.
5.6 Address 4 – 17: Key Signal
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.
Table 5-4. Detection Status
Address b7 b6 b5 b4 b3 b2 b1 b0
2
CALIBRATE
OVERFLO
W
– – – – – TOUCH
Table 5-5. Key Status
Address b7 b6 b5 b4 b3 b2 b1 b0
3 Reserved KEY6 KEY5 KEY4 KEY3 KEY2 KEY1 KEY0
Table 5-6. Key Signal
Address b7 b6 b5 b4 b3 b2 b1 b0
4 MSByte OF KEY SIGNAL FOR KEY 0
5 LSByte OF KEY SIGNAL FOR KEY 0
6–17 MSByte/LSByte OF KEY SIGNAL FOR KEYS 1 – 6
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AT42QT1070 [DATASHEET]
9596C–AT42–05/2013
5.7 Address 18 – 31: Reference Data
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.
5.8 Address 32 – 38: Negative Threshold (NTHR)
NTHR Keys 0 – 6: these 8-bit values set the threshold value for each key to register a detection.
Default: 20 counts
Note: Do not use a setting of 0 as this causes a key to go into detection when its signal is equal to its reference.
5.9 Address 39 – 45: Averaging Factor/Adjacent Key Suppression (AVE/AKS)
AVE 0–5: The Averaging Factor (AVE) is the number of pulses which are added together and averaged to get the
final signal value for that channel.
For example, if AVE = 8 then 8 ADC samples are taken and added together. The result is divided by the original
number of pulses (8). If sixteen pulses are used then the result is divided by sixteen.
This provides a better signal-to-noise ratio but requires longer acquire times. Values for AVE are restricted internally
to 1, 2, 4, 8, 16 or 32.
Default: 8 (In standalone mode key 0 is 16)
AKS 0 – 1: these bits control which keys are included in an AKS group. There can be up to three groups, each
containing any number of keys (up to the maximum allowed for the mode).
Each key can have a value between 0 and 3, which assigns it to an AKS group of that number. A key may only go
into detect when it has the largest signal change of any key in its group. A value of 0 means the key is not in any AKS
group.
Default: 0x01
Table 5-7. Reference Data
Address b7 b6 b5 b4 b3 b2 b1 b0
18 MSByte OF REFERENCE DATA FOR KEY 0
19 LSByte OF REFERENCE DATA FOR KEY 0
20–31 MSByte/LSByte OF REFERENCE DATA FOR KEYS 1 – 6
Table 5-8. NTHR
Address b7 b6 b5 b4 b3 b2 b1 b0
32–38 NEGATIVE THRESHOLD FOR KEYS 0 – 6
Table 5-9. AVE/AKS
Address b7 b6 b5 b4 b3 b2 b1 b0
39–45 AVE5 AVE4 AVE3 AVE2 AVE1 AVE0 AKS1 AKS0
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AT42QT1070-SSUR

Mfr. #:
Buy AT42QT1070-SSUR
Manufacturer:
Microchip Technology
Description:
Capacitive Touch Sensors QTouch 7 Channel Touch Sensor IC
Lifecycle:
New from this manufacturer.
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