Maxim Integrated MAX78630+PPM Evaluation Kit - Manual (Page 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
1 +5V DC Connect to external source
2 Data In – P Three-state, bidirectional
3 Data In – N Three-state, bidirectional
4 Data Out – N Three-state, bidirectional
5 Data Out – P Three-state, bidirectional
6 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