CY8CMBR2110 Datasheet, PDF (21/68 Pages) Cypress Semiconductor – CapSense® Express™ 10-Button Controller

CY8CMBR2110
Response Time
Response time is the minimum amount of time the button should be touched for the device to detect as a valid button touch.
It is given by the following equations:
1. If Noise Immunity Level is “Normal”
.
2. If Noise Immunity level is “High”.
Where
RT_CBT is Response time for consecutive button touch after first button touch
RT_FBT is Response time for First button touch
Debounce for CS1-CS9 can be from 1 to 255
Debounce for CS0 can be from 1 to 255
Round_down is the greatest integer less than or equal to ((Debounce – 1)/3)
Refer to Table 7 on page 20 to obtain Button Scan Rate constant.
For example, consider an eight-button, Response Time-optimized design with the Button Scan Rate offset set to 391 ms. The Noise
Immunity level is set to Normal.
Let us assume that CS0 is not used in the design and the Debounce value for each button (CS1–CS8) is set as 3. The Button Scan
Rate constant for such a design is 35 ms (see Table 5 on page 16), which results in a Button Scan Rate to be (35 + 391 ms) 426 ms.
The response time for such a design is given as:
Document Number: 001-74494 Rev. *A
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