Cypress Semiconductor CY3280-MBR3 データシート

Document Number: 001-85330 Rev. *G 

Page 4 of 37

The CY8CMBR3xxx family of controllers supports up to 16 

capacitive sensors. These can be configured as follows:

■

Up to 16 CapSense buttons 

■

Up to two sliders: Configurable as linear or radial sliders

■

Up to two proximity sensors that can detect up to 30-cm 

proximity distance

■

Supports up to two 5-segment sliders 

■

Configures each slider individually as linear or radial

■

Combines both sliders to form one 10-segment slider

■

Slider resolution is user-configurable

■

The CY8CMBR3xxx family supports up to two proximity 

sensors with a detection range of up to 30 cm. These proximity 

sensors are capable of detecting both proximity and touch 

events. 

■

The wake-on-approach feature wakes the devices from a 

low-power state to Active mode on a proximity event.

■

The device also features driven shield, which enhances the 

proximity sensing range in the presence of metal objects.

■

The device supports proximity sensors with C

P

 ranging from 

8 pF to 45 pF.

The CY8CMBR3xxx family features SmartSense Auto-tuning, 

Cypress's patented CapSense algorithm, which continuously 

compensates for system and environmental changes during run 

time. SmartSense Auto-tuning has the following advantages:

■

Reduces design effort by eliminating manual tuning

■

Adapts to variations in PCB, overlay, paint, and manufacturing 

that degrade touch-sensing performance

■

Eliminates manual tuning in production

■

Adapts to changes in the system environment due to noise

■

Allows a platform design approach with different overlays, 

button shapes, and trace lengths

The CY8CMBR3xxx family delivers water-tolerant designs that 

eliminate false touches due to wet conditions, such as water 

droplets, moisture, mist, steam, or even wet hands. The 

CapSense controller locks up the user interface in firmware to 

prevent touch inputs in streaming water.

The CY8CMBR3xxx family offers water-tolerance to liquids such 

as water, ketchup, oil, and blood.
Enable the shield electrode through the 

, using 

EZ-Click, to prevent false touches under wet conditions and 

enable both the shield electrode and guard sensor to prevent 

false touches in streaming water conditions. The shield electrode 

and guard sensor consume a port pin each in the CapSense 

controller. Refer to the 

 

for best practices and design guidelines for implementing 

water-tolerant designs.

The CY8CMBR3xxx family features the robust CSD PLUS 

capacitive sensing algorithm. Additionally, it implements the 

advanced noise immunity algorithm, EMC, for stable operation 

in extremely noisy conditions. 
The EMC algorithm has higher average power consumption. For 

low-power applications, where noise conditions are not extreme, 

you can disable this feature through the I

2

C interface.

This feature distinguishes between signals from closely spaced 

buttons, eliminating false touches. It ensures that the system 

recognizes only the first button touched.

The CY8CMBR3xxx family has pins that you can configure for 

audio-visual feedback through a buzzer or an LED.

The GPOs are high-sink current, open-drain outputs that can 

drive most LEDs. The GPO status can be controlled directly by 

the CapSense sensors so that a sensor 'ON' status automatically 

turns ON a corresponding LED. Alternatively, GPOs can be 

controlled by the host through the I

2

C interface. 

The GPOs also support advanced features, such as:

■

CSx to GPOx Direct Drive: Directly control the GPOs upon 

button touch or proximity event. 

■

Pulse width modulation (PWM): Controls LED brightness.

■

Toggle: The GPO status is toggled upon every touch event on 

the button sensors, and proximity event on proximity sensors, 

to mimic the functionality of the mechanical toggle switch.

■

Voltage output: Analog voltage that represents the button 

status.

The output pins of the CY8CMBR3xxx controllers can be 

configured for driving a single-input DC Piezo-electric buzzer 

through a PWM. The PWM frequency and buzzer activation 

duration are configurable. The buzzer output is activated for a 

finite amount of time when a finger touch is detected.