User manual

Figure 4. I/O level translator.
The LDO in Figure 5 generates the 4.3V to supply the level translator in Figure 4.
The charge-pump in Figure 6 provides the the 6V reference for the clipper in Figure 7.
When all ESD diodes protecting DIO_USR in Figure 3 are OFF, Q3B is OFF, and also Q4. If
overvoltage is applied on some DIO_USR pins, rising VU5V2_ESD in Figure 7 above 5.2V,
Q3B and Q4 turn ON , clipping VU5V2_ESD at approximately 5V.
Figure 5. VCCIO_SW supply.
Figure 6. VU6V0 supply.