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

Without proper signal isolation, on non-5V tolerant

pins, the remote signal can power the PIC32 device

through the high side ESD protection diodes.

Besides violating the absolute maximum rating

specification when VDD of the PIC32 device is

restored and ramping up or ramping down, it can

also negatively affect the internal Power-on Reset

(POR) and Brown-out Reset (BOR) circuits, which

can lead to improper initialization of internal PIC32

logic circuits. In these cases, it is recommended to

implement digital or analog signal isolation as

depicted in Figure 2-6, as appropriate. This is

indicative of all industry microcontrollers and not just

Microchip products.

TABLE 2-1:

EXAMPLES OF DIGITAL/

ANALOG ISOLATORS WITH

OPTIONAL LEVEL

TRANSLATION

Example Digital/Analog

Signal Isolation Circuits

ADuM7241 / 40 ARZ (1 Mbps) X — — —

ADuM7241 / 40 CRZ (25 Mbps) X — — —

ISO721

— X ——

LTV-829S (2 Channel)

—— X —

LTV-849S (4 Channel)

—— X —

FSA266 / NC7WB66

——— X

FIGURE 2-6:

DIGITAL/ANALOG SIGNAL ISOLATION CIRCUITS

External VDD

REMOTE_IN

Digital Isolator

PIC32 VDD

IN

PIC32

Conn

External VDD

REMOTE_IN

REMOTE_OUT

Digital Isolator

PIC32 VDD

IN1

PIC32

OUT1

External VDD

REMOTE_IN

Opto Digital

ISOLATOR

VSS

PIC32 VDD

IN1

PIC32

Analog_OUT2

External_VDD1

Analog_IN1

VSS

Analog / Digital Isolator

Conn

ENB

Analog_IN2

ENB

Analog Switch

VSS

PIC32 VDD

PIC32

VSS

 2014-2017 Microchip Technology Inc.

DS60001290E-page 31

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