How to size the CY8CLEDAC01 VCC capacitor.

Question: How do I select the correct size VCC capacitor for the CY8CLEDAC01?

 

Answer:

How do I select the correct size VCC capacitor for the CY8CLEDAC01?

The basic formula for determining the CY8CLEDAC01 VCC capacitor is CVCC = (It/V).

Convert to CY8CLEDAC01 parameters: CVCC = (ICC(VCChld))/(VCCst-VCCUVL).

ICC = 20 mA: Maximum from AC01 data sheet .

VCChld = 1 ms: Maximum time for AC01 to determine if safe to operate.

VCCST = 10.8V: Minimum from AC01 data sheet.

VCCUVL = 6.6V: Maximum from AC01 data sheet.

CVCC = (ICC(VCChld))/(VCCst-VCCUVL) = (20mA(1ms))/(10.8V-6.6V) = 20u/4.2 = 4.76uF.

The CY8CLEDAC01 design uses 4.7 µF for CVCC.