Cypress Semiconductor CY3280-MBR3 データシート

Document Number: 001-85330 Rev. *G 

Page 12 of 37

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Dynamically sets all threshold parameters for button sensors, 

depending on the noise in the environment. 

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Applicable only to button sensors.

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Mutually exclusive from the EMC feature. If EMC is enabled, 

automatic threshold is automatically disabled. 

This feature allows specification of the minimum change in 

sensor capacitance that can trigger a sensor state change (OFF 

to ON or vice-versa).

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Sensitivity can be specified individually for each CapSense 

button and slider.

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Sensitivity can be specified as one of the four available values: 

0.1 pF, 0.2 pF, 0.3 pF, and 0.4 pF.

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Higher sensitivity values can be used for thick overlays or small 

button diameters.

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Lower sensitivity values should be used for large buttons or 

thin overlays to minimize power consumption.

This feature resets the CapSense sensors to the OFF state after 

a specific time period, even though they continue to be activated.

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Resets the sensor baseline to the current raw count after a 

specific time period, even though the sensors continue to be 

activated. 

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Prevents a stuck sensor when a metal object is placed close 

to that sensor.

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The Auto Reset period can be set to 5 or 20 seconds and can 

be configured through two global settings provided in the 

❐

Global setting for all proximity sensors

❐

Global setting for all CapSense buttons and slider segments

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The guard sensor does not undergo Auto Reset.

Automatic Threshold

Automatically tunes all the threshold 
parameters of the sensors for 
different noise settings

Sensitivity Control

Maintains optimal button 
performance for different overlay 
and noise conditions

Sensor Auto Reset

Recalibrates the sensor when a 
stuck-sensor (fault) condition 
occurs, and avoids invalid sensor 
output status to host

Noise Immunity

Provides immunity against external 
noise and the ability to detect 
touches without false trigger in noisy 
environments

Flanking Sensor 
Suppression (FSS)

Avoids multiple button triggers in a 
design with closely spaced buttons

Host Controlled GPOs

GPO pins, which can be controlled 
by the host processor through I

2

C

LED On time

GPO output status stays ON for a 
set duration after the touch is 
released to provide better visual 
feedback to the user

Toggle

Sensor output status toggles on 
every sensor activation to mimic the 
mechanical toggle button 
functionality

Buzzer Signal Output

Provides audio feedback on button 
touch

Host Interrupt 

Provides interrupt to host when 
there is a change in sensor status

Latch Status Output

Latches the sensor status changes 
in the register until the host reads 
the activated sensor status; this 
ensures that the sensor status is 
always read by the host even if the 
host is late to service the host 
interrupt signal from CY8CMBR3xxx 

Analog Voltage Output

Indicates the button status through 
voltage levels 

System Diagnostics

Supports production testing and 
debugging

Low-Power Sleep Mode 
and Deep Sleep Mode

Reduces power consumption

CSx

GPOx

Auto Reset Period

GPOx turns inactive as Auto 

Reset period expired for CSx

Sensor 

Activated

Touch on Sensor