MAX14827A Datasheet, PDF (40/42 Pages) Maxim Integrated Products – High Configurability and Integration Reduce SKUs

MAX14827A
Low-Power, Ultra-Small, Dual Driver,
IO-Link Device Transceiver
Shared SPI/UART Interface
Figure 12 is an example of the use of a minimum pin-
count microcontroller. A microcontroller serial port,
which supports both UART and SPI functions, is used
for managing both transceiver control (SPI) and IO-
Link data communication (UART). The microcontroller’s
shared UART and SPI interface pins are multiplexed. The
transceiver’s SPI is typically only used for configuration at
power-up and occasionally afterwards for reconfiguration,
and diagnostics. During an IO-Link master-device
communication cycle, the idle time on the C/Q interface
can be used for SPI activity. This is possible by slightly
increasing the IO-Link device’ minimum cycle time.
5V
1µF
3.3V
1µF
VCC
GPIO2
GPO
MICROCONTROLLER _SS
SCLK/RTS
MISO/RX
MOSI/TX
GND
GPO
VL
V33
V5
REG
V24
SPI/PIN
IRQ/OC
UARTSEL
CS
CLK/TXEN
SDO/RX
MAX14827A
SDI/TX
DO
WU
DI
LED1
GND
LED2
C/Q
0.1µF
L+
DI/DO
1
2
4
3
C/Q
L-
Figure 12. Multiplexed SPI/UART Mode Configuration
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