VREF of PSoC 4 CapSense Component - KBA220609

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Translation - Japanese: ​VREF of PSoC 4 CapSense Component - KBA220609

Question:

Can V_REF of PSoC® 4 CapSense® Component be changed?

Answer:

The value of V_REF is fixed and is equal to 1.2 V for all the PSoC 4 family of devices except the PSoC 4 S-Series and PSoC Analog Coprocessor family. For the PSoC 4 S-Series and PSoC Analog Coprocessor family, V_REF can vary from 0.6 V to V_DDA – 0.6 V. For more details, refer to AN85951.

Question: How can I change V_REF of PSoC 4 S-Series?

Answer:

The range of valid values is from 1.2 V to V_DDA - 0.6V, where V_DDA is the input voltage of the VDDA pin as set in the DesignWide Resources (*.cydwr) System editor.

By default, the reference voltage value (V_REF) depends on VDDA:

V_DDA < 2.6 V: V_REF = 1.2 V

2.6 V ≤ V_DDA < 3.2 V: V_REF = 1.4769 V

3.2 V ≤ V_DDA < 4.7 V: V_REF = 2.0211 V

V_DDA ≥ 4.7 V: V_REF = 2.7429 V

If you need other values of V_REF, contact Cypress sales team or technical support.

Reference:

PSoC® 4 and PSoC Analog Coprocessor CapSense® Design Guide