CY8CMBR2110-24LQXI Ver la hoja de datos (PDF) - Cypress Semiconductor
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CY8CMBR2110-24LQXI Datasheet PDF : 71 Pages
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CY8CMBR2110
Toggle ON/OFF
■ Toggles the GPO state at each button touch (see Figure 4).
■ Use for mechanical button replacement (for example, wall
switch).
1. When only one button is touched, it is reported as ON (see
Figure 5).
2. When more than one button is detected as ON, and previously
one of those buttons was touched, then the button touched
previously is reported as ON (see Figure 6).
■ Toggle feature can be enabled on each CapSense button
individually.
Flanking Sensor Suppression (FSS)
Noise Immunity
■ Improves the immunity of the device against external radiated
and conducted noise.
■ Allows only one button to be in the TOUCH state at a time. You
can distinguish TOUCH states for closely spaced buttons.
■ If a finger contacts multiple buttons, only the first one to sense
a TOUCH state turns ON.
■ Also used in situations when a button can produce opposite
effects. For example, an interface with two buttons for
brightness control (UP or DOWN).
■ FSS can be enabled for each button individually. This helps to
enable FSS only for those buttons which are closely spaced.
For example, if a design has ten buttons with six buttons
closely-spaced, FSS can be enabled just for those six buttons.
■ Reduces the radiated noise emission.
■ Possible Noise Immunity levels are “Normal” and “High”.
■ Select “High” only in a high-noise environment because it
increases device power consumption and response time.
Automatic Threshold
■ Button Signal is compared to Finger Threshold for GPO output
■ Finger Threshold is configurable; valid range is 50-245 counts
■ Used to determine button ON/OFF state for different noise
conditions
■ FSS action can be explained for the following scenarios:
■ You can configure Finger Threshold to be set automatically
■ To learn more about Finger Threshold, refer to Section 2.3 in
Getting Started with CapSense
Figure 4. Example of Toggle ON/OFF Feature on GPO0
CS0
GPO0
Figure 5. FSS when One Button is Touched
No button is ON Prior to the Touch
CS1 is Reported as ON Upon Touch
Figure 6. FSS when Multiple Buttons are Touched with One Button ON Previously
CS1 is touched; reported ON
CS2 also touched along with CS1;
CS1 is reported ON
Document Number: 001-74494 Rev. *B
Page 8 of 71
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