Share and discuss: About the VDDIO and VLDO pins of the LP8863ADCPRQ1 chip[Copy link]
Do the VDDIO and VLDO of the LP8863ADCPRQ1 chip need external power input pins? Or are they the output voltage pins inside the chip? Why are these two power pins connected together on the datasheet? Please explain. Answer: VLDO is output, VDDIO is input, the former supplies power to the latter. Question: No external voltage is required, VDD and VLDO come from the internal LDO output, VDDIO supplies power to the internal circuit, just connect to VDD and VLDO. A capacitor needs to be added to connect to the ground. Hello, but I found in the EVM design of LP8863 that VDDIO and VLDO are powered separately, which is different from what you said? Please explain, thank you! Attached is the manual and screenshots of the chip EVM!
Answer: VLDO can indeed be powered separately, but VDD and VLDO come from the internal LDO and do not require external power supply. The EVM board needs to add a lot of terminals to take into account a variety of test situations. Answer: Since it is power supply, as long as the voltage and current are met, it doesn’t matter who actually provides the voltage, so different designs will have different considerations, such as I/O port voltage. The simpler one is to directly use your own LDO to power your own I/O port, which is suitable for 1.8VI/O port. Many replies》》》》》》
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