Cypress Semiconductor CY3280-MBR3 データシート

Document Number: 001-85330 Rev. *G 

Page 5 of 37

The CY8CMBR3xxx registers may be configured through the I

2

C 

interface. Device features may be enabled, disabled, or modified 

by writing appropriate values to the I

2

C configurable 

. This register map also provides various status outputs to 

indicate the touch/release status and system performance and 

debug parameters.
You can access the 

 of the device through the I

2

C 

interface by a host controller, such as a microcontroller or the 

EZ-Click Customizer.
The CY8CMBR3xxx devices feature a safe 

 update 

mechanism to overcome configuration data corruption, which 

can occur due to power failure during flash writes or any other 

spurious events. If the configuration data is corrupted during a 

 update, the devices reconfigure themselves to the 

last known valid configuration.

The CY8CMBR3xxx family communicates to a host processor 

through the following methods:

■

The I

2

C interface allows the host to configure parameters and 

receive status information on touch events

■

The host interrupt alerts the host when a new touch event 

occurs. This helps to build effective communication between 

the host and the CapSense controller. Alternatively, the CPU 

can poll the device status by reading through I

2

C. 

■

The GPO provides the ON or OFF sensor status to the host. 

The GPO ports can also be used to implement analog voltage 

and DC output (DCO) using an external resistor network.

The CY8CMBR3xxx devices are equipped with a system 

diagnostics feature to detect system-level fault conditions and to 

avoid failure of the user interface design. The system diagnostic 

features also help to monitor system-level parameters to debug 

the design during development.

The built-in system diagnostics detects the following fault condi-

tions at power-up and helps to monitor the following:

■

Improper value of the modulating capacitor (C

MOD

)

■

C

P 

value out of range

■

Sensor shorts

For low-power applications, such as those operated by a battery, 

select a capacitive sensing controller that has ultra-low average 

power consumption.
The CY8CMBR3xxx controllers draw an average current of 

22 µA per sensor at 1.8 V.
The CY8CMBR3xxx family supports two operating modes:

■

Active: The sensors are scanned periodically for power 

optimization.

■

Deep Sleep: The sensors are not scanned until a command 

from the host is received to resume sensor scanning.

In the Active mode, CY8CMBR3xxx family implements additional 

techniques, such as optimizing the average power consumption 

and providing a smooth user interface experience without 

increasing the refresh interval.
In addition to these modes, the device has a wake-on approach 

feature, which uses proximity sensing to reduce the average 

power consumption, ensuring power saving when the system is 

inactive.
Details of all features are documented in