AT42QT2161-MMU Atmel, AT42QT2161-MMU Datasheet - Page 36

• Manufacturer Part Number: AT42QT2161-MMU
• Description: IC TOUCH SENSOR 16KEY QFN M-MOD
• Manufacturer: Atmel
• Type: Capacitiver

Specifications of AT42QT2161-MMU

• Touch Panel Interface: 8, 2-Wire
• Number Of Inputs/keys: 16 Key, Slider
• Resolution (bits): 10 b
• Data Interface: I²C, Serial
• Voltage Reference: Internal
• Voltage - Supply: 1.8 V ~ 5.5 V
• Current - Supply: 1.14mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-VFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6.26
6.27
6.28
36
Address 77: GPIO Wake
Address 78 – 79: Common Change Keys
Address 100 – 163: Signals and References
AT42QT2161
Table 6-27.
Table 6-28.
If the corresponding bit is set to 1, dedicated GPIO pins set to inputs will still be read during
SLEEP mode (no capacitive sensing carried out). When a change in the state of the inputs is
detected, the CHANGE line will be triggered and the QT2161 will go back to SLEEP.
Default: 0 (Wake disabled)
k0 – k15: represents the respective keys. If set to 1, the respective key is included in the
common change comparisons.
Note: if no keys are included in the Common Change group, the CC bit is set to 1.
Default: 0 (not included)
Addresses 100 – 131 allow signal data to be read for each key. There are two bytes of data for
each key. These are the key’s 16-bit signal which is accessed as two 8-bit bytes, stored LSB
first.
Addresses 132 – 163 allow reference data to be read for each key. There are two bytes of data
for each key. These are the key’s 16-bit reference which is accessed as two 8-bit bytes, stored
LSB first.
There are a total of 16 keys and 4 bytes of data per key, yielding a total of 64 addresses. These
addresses are read-only.
Table 6-29.
Address
Address
104 – 131
Address
77
78
79
100
101
102
103
GPIO Wake
Common Change Keys
Signal and References
k15
b7
b7
k7
0
2 – 15
Key #
0
0
1
1
k14
b6
b6
k6
0
Signal MSB
Signal MSB
Signal LSB
Signal LSB
Use
k13
b5
b5
k5
0
GPIO3
k12
b4
b4
k4
136 – 163
Address
132
133
134
135
GPIO2
k11
b3
b3
k3
2 – 15
Key #
GPIO1
0
0
1
1
k10
b2
b2
k2
Reference MSB
Reference MSB
Reference LSB
Reference LSB
b1
b1
k1
k9
0
9614A–AT42–08/10
Use
–
b0
b0
k0
k8
0