PIC32MX230F128L-I/PF View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC32MX230F128L-I/PF

32-bit Microcontrollers (up to 512 KB Flash and 64 KB SRAM) with Audio/Graphics/Touch (HMI), CAN, USB, and Advanced Analog

Microchip Technology 

PIC32MX1XX/2XX/5XX 64/100-PIN FAMILY

2.9.2 5V TOLERANT INPUT PINS

The internal high side diode on 5V tolerant pins are

bussed to an internal floating node, rather than being

connected to VDD, as shown in Figure 2-7. Voltages

on these pins, if VDD < 2.3V, should not exceed

roughly 3.2V relative to VSS of the PIC32 device.

Voltage of 3.6V or higher will violate the absolute

maximum specification, and will stress the oxide

layer separating the high side floating node, which

impacts device reliability. If a remotely powered

“digital-only” signal can be guaranteed to always be

 3.2V relative to Vss on the PIC32 device side, a

5V tolerant pin could be used without the need for a

digital isolator. This is assuming there is not a

ground loop issue, logic ground of the two circuits

not at the same absolute level, and a remote logic

low input is not less than VSS - 0.3V.

FIGURE 2-7:

PIC32 5V TOLERANT PIN ARCHITECTURE EXAMPLE

PIC32

VDD

5V Tolerant Pin

Architecture

On/Off

Floating Bus

Oxide BV = 3.6V

if VDD < 2.3V

OXIDE

ANSEL

Remote

VIH = 2.5V

Remote

GND

RG10

I/O IN

I/O OUT

TRIS

PIC32

POWER

SUPPLY

VSS

DS60001290E-page 32

 2014-2017 Microchip Technology Inc.

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