AT42QT2161-MMU Atmel, AT42QT2161-MMU Datasheet - Page 35

• 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

6.24
6.25
9614A–AT42–08/10
Address 74 – 75: GPIO/GPO PWM
Address 76: PWM Level
Table 6-25.
Table 6-26.
Shared X line GPOs are always outputs. By default, the dedicated GPIOs are set as inputs.
Make sure to drive (set to outputs) these GPIOs if not used, as floating pins may consume
unnecessary current.
Default: 0 (All inputs)
Setting the corresponding GPIO PWM bit to 1 will enable PWM on the respective pin. The pin
will be driven according to the duty cycle specified in PWM Level (address 76).
PWM will only be enabled on GPIOs that have their GPIO direction set to 1 (output).
Shared X line GPOs will only be driven when not performing any measurements. During
measurements, burst pulses will be driven from the X lines. Ensure that any connected device
will not be affected.
All PWM enabled GPIOs/GPOs will only be switched when not doing any measurements.
Therefore, the PWM duty cycle’s accuracy will depend on the burst lengths of keys, as the
longer the burst length, the longer the periods of no PWM switching.
Default: 0 (PWM disabled)
This sets the Duty Cycle of the PWM enabled pins. Valid values are between 0 – 255. There is a
constant level band at either end of the range, so:
Default: 0 (100 percent low output)
• A value of 0 – 10 gives a 100 percent low output
• A value of 250 – 255 gives a 100 percent high output
Address
Address
74
75
76
GPIO/GPO PWM
PWM Level
b7
X7
b7
0
X6
b6
b6
0
X5
b5
b5
0
GPIO3
b4
X4
b4
DUTY_CYC
GPIO2
b3
X3
b3
GPIO1
b2
X2
b2
AT42QT2161
X1
b1
b1
0
X0
b0
b0
0
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