CY8CMBR3002 Datasheet, PDF (18/42 Pages) Cypress Semiconductor – CapSense® Express™ Controllers with SmartSense™ Auto-tuning 16 Buttons, 2 Sliders, Proximity Sensors

CY8CMBR3002, CY8CMBR3102
CY8CMBR3106S, CY8CMBR3108
CY8CMBR3110, CY8CMBR3116 Datasheet
LED ON Time
■ Keeps the GPO status ON for a particular period of time after
the falling edge of a sensor, for better visual indication through
LEDs
Figure 6. CSx Controls GPOx with LED ON Time Enabled
Sensor
Activated
CSx physical
status
CSx bit in
BUTTON_STAT
GPOx
Sensor
Deactivated
BUTTON_STAT
register shows
sensor inactivation
Button response time
LED ON Time
Buzzer Signal Output
■ Produces a PWM signal to drive a Piezo-Buzzer that generates
audio feedback when a touch is detected on a CapSense button
or a guard sensor.
■ Supports buzzer connection, as shown in the following figure.
Figure 8. Buzzer Connection^[9]
Buzzer
V_DDIO
CY8CMBR3xxx
BUZ
■ Can be enabled only when the GPO is directly controlled by a
CapSense sensor
■ Can be enabled or disabled on each sensor and the ON Time
duration can be configured from 0 to 2 seconds in 20-ms incre-
ments
■ Can be enabled in all configurations of GPOs except the Toggle
mode
■ Not applicable when the sensor status is turned off by Sensor
Auto Reset
Toggle
■ The controller can toggle the GPO state at every rising edge
of a sensor activation event to mimic the functionality of a
mechanical toggle switch (a touch event for a button sensor
and a proximity event for proximity sensors activates a sensor).
Figure 7. CSx Controls GPOx with the Toggle Enabled
Sensor
Activated
Sensor
Deactivated
Sensor
Activated
CSx
GPOx
■ PWM frequency is configurable: The buzzer frequency is
configurable to meet different Piezo-Buzzer drive requirements
and to provide different tones. The buzzer frequency may be
configured either by using the EZ-Click tool or by writing to the
corresponding control register. Refer to System Specifications
on page 27 for the supported buzzer frequencies.
■ Generates PWM output for a fixed duration (ON time) when a
touch is detected. The ON time is configurable through
EZ-Click, from 100 ms to 12.7 s, in steps of 100 ms,
■ Buzzer signal output and EMC (refer to the CY8CMBR3xxx
Registers TRM) are mutually exclusive features. These must
not be enabled simultaneously.
Figure 9. Buzzer Activation on a Touch Event
Sensor
Activated
CSx
BUZ
CSx Active
■ Can be enabled only when the GPO is directly controlled by a
capacitive sensor.
■ Can be enabled or disabled individually on each capacitive
sensor.
■ Can be enabled in all configurations of GPOs—that is, Active
LOW and Active HIGH DC output, PWM output, open-drain,
and strong drive modes.
Buzzer ON Time
The buzzer output does not restart if multiple trigger events occur
before the Buzzer ON Time elapses.
Note
9. Buzzer must be connected between V_DDIO and the BUZ pin. If V_DDIO is not available on the device, connect the buzzer to V_DD instead of V_DDIO.
Document Number: 001-85330 Rev. *M
Page 18 of 42