Maxim-integrated MAX78630+PPM Evaluation Kit Manual de usuario descargar pdf (Pagina 14)

MAX78630+PPM Evaluation Kit User Manual

14 Rev 0

3 Serial Interfaces Selection and Configuration

The MAX78630+PPM has integrated UART, SPI (Slave), and I

C (Slave) interfaces. Only one interface can be

active at a time and the selection is done at reset/power-on.

The UART interface also supports RS-485/422. The MAX78M6630+PPM EV board includes an isolated RS-

485/422 transceiver.

Table 9 shows the settings of SW4 for the individual interface selection; the signal IFC0 and IFC1 are sampled

at reset and power-on.

Table 9: SW4 Serial Interface Selection

Interface Mode

SW4 1

(IFC0)

SW4 2

(IFC1)

SPI 0 (ON) X (don’t care)

UART 1 (OFF) 0 (ON)

C 1 ()FF) 1 (OFF)

The MAX78630+PPM EV board provides the serial port signals on connector J16.

3.1 UART Interface Settings

The MAX78M6630+PPM implements a serial communication protocol (SSI) that supports multipoint

communication. The device address (lower bits) is selected through the pins ADDR0 and ADDR1, as shown in

Table 10. The upper bits of the address are set through the register DEVADDR, as described in the IC data

sheet.

Table 10: SW5 Address Selection

Device Address

DEVADDR[5:1]

SW5 2

Bit 1

SW5 1

Bit 0

The EV board includes an isolated RS-485/422 transceiver. The MAX78630+PPM serial UART is connected to

the RS-485/422 transceiver when a multi-drop RS-485/422 bus is available.

UART/USB Interface and UART/RS-485/422 Interface Configuration

In order to operate the UART through the USB/FTDI device or RS-485/422, the jumper must be set according

Table 11.

Table 11: Jumper Setting for UART/USB Interface

Jumper

Position

J17 1-2

J18 1-2

J28 Removed

J29 Removed

J27 Removed

J38 Removed

J30 Removed

J12 Removed

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 31 32

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