Maxim-integrated MAX78630+PPM Evaluation Kit Bedienungsanleitung PDF herunterladen (Seite 15)

MAX78630+PPM Evaluation Kit User Manual

Rev 0 15

UART/RS-485/422 Interface Configuration

In order to operate the UART through the RS-485/422 transceiver, the jumpers must be set accordingly to

Table 12. Table 13 contains the pin assignment of connector J22.

Table 12: Jumpers Settings for UART/RS-485/422

Jumper

Position

J17 2-3

J18

2-3

J28 Removed

J29 Removed

J27

(See note)

J38 (See note)

J30

Removed

J12

2-3

Note: These jumpers are used to insert a 120Ω termination on the RS-485 bus. The termination should be

inserted or removed according to the board location on the RS-485 bus.

Table 13: J22 RS-485/422 Connector Pin Assignment

J22 Pin Number

Pin Name

Pin Description

+5V DC

Connect to external source

2 Data In – P Three-state, bidirectional

Data In – N

Three-state, bidirectional

Data Out – N

Three-state, bidirectional

5 Data Out – P Three-state, bidirectional

GND

Connect to external source

3.2 SPI Settings

The MAX78M6630+PPM has an on-chip SPI (slave) interface. The interface is selected through SW4

according to

Table 9. The SPI interface can be accessed through the USB interface or directly via J16; both

connectors are galvanically isolated.

SPI/USB Interface Configuration

Table 14: Jumper Setting for SPI/USB Interface

Jumper Position

J17 1-2

J18 1-2

J28 Inserted

J29 Inserted

J27 Removed

J38 Removed

J30 Inserted

J12 1-2

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 31 32

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