Adjusting PSoC® Trims for 3.3V and 2.7V Operation - AN2012 | Cypress Semiconductor
Adjusting PSoC® Trims for 3.3V and 2.7V Operation - AN2012
For the PSoC® microcontroller to meet the Internal Main Oscillator frequency accuracy and Internal Voltage Reference accuracy specifications, proper settings must be loaded in the associated trim registers. The trim register settings are different for 5V operation (5.25V ≥ VDD ≥ 4.75V), 3.3V operation (3.6V ≥ VDD ≥ 3.0V), and 2.7V operation (2.4V ≥ VDD ≥ 3.0V). Trim values for 5V operation are automatically loaded during power on reset (POR). This application note demonstrates how to set the trim voltages for 5V, 3.3V, and 2.7V operation.