at42qt2160 ATMEL Corporation, at42qt2160 Datasheet - Page 34

• Manufacturer Part Number: at42qt2160
• Description: Qslide?, 16-key Qmatrix? Sensor Ic
• Manufacturer: ATMEL Corporation

7.24
7.25
34
Address 74...75: GPIO/GPO PWM
Address 76: PWM Level
AT42QT2160
Table 7-25.
Table 7-26.
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 doing any measurements. During
measurements, burst pulses will be driven from the X lines, making sure that the driven 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 to 255. A value
of 0...10 will be 100 percent duty cycle (always on), and a value of 250...255 will be 0 percent
duty cycle (always off).
Default: 0 (100 percent duty cycle)
Address
Address
74
75
76
GPIO/GPO PWM
PWM Level
X7
b7
b7
0
X6
b6
b6
0
b5
X5
b5
0
GPIO3
b4
X4
b4
DUTY_CYC
GPIO2
b3
X3
b3
GPIO1
X2
b2
b2
X1
b1
b1
0
9502A–AT42–07/08
b0
X0
b0
0