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CY8CMBR2044 Datasheet(PDF) 9 Page - Cypress Semiconductor |
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CY8CMBR2044 Datasheet(HTML) 9 Page - Cypress Semiconductor |
9 / 26 page CY8CMBR2044 Document Number: 001-57451 Rev. *C Page 9 of 26 Flanking Sensor Suppression ■ Provides discrimination between closely spaced sensors ■ At any point of time, only one sensor is reported as ON ■ The first sensor touched is reported as ON until it is released, even if other sensors are pressed Figure 4. Sensor Status with Respect to Finger Touch when FSS is Enabled Failure Mode Analysis A built-in Power On Self Test (POST) mechanism detects the following at power on reset (POR), which can be useful in production testing. Sensor Shorted to Ground If a sensor is disabled a 5 ms pulse is sent out on the corre- sponding GPO within 175 ms of power on. Figure 5. Sensor Shorted to Ground Sensor Shorted to VDD If any sensor is shorted to VDD that sensor is disabled and a 5 ms pulse is sent out on the corresponding GPO within 175 ms of power on. Figure 6. Sensor Shorted to VDD Sensor to Sensor Short Any Sensors that are shorted together is disabled and 5ms pulse is sent out on the GPOs of the shorted sensors within 175ms of power on. Figure 7. Sensor to Sensor Short Proper Value of CMOD ■ Recommended value of CMOD is 2 nF to 2.4 nF. ■ If CMOD of < 1 nF or > 4 nF is connected, all sensors are disabled and a 5 ms pulse is sent out on all the GPOs within 175 ms of power on. Sensor CP > 40 pF If the parasitic capacitance (CP) of any sensor exceeds 40 pF that sensor is disabled and a 5 ms pulse is sent out on the corresponding GPO within 175 ms of power on. [+] Feedback |
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