NXP Semiconductors
S32K3X4EVB-Q257 | S32K3X4EVBQ257ND
HWUM
Hardware User Manual
S32K3X4EVB-Q257 HWUM
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NXP Semiconductors
REV B
– 9/2021
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20
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Table 11. USB to serial interface - Control Jumpers
Signal
/Module
MCU
Port
Reference
Description
Comment
1
LPUART13_RX
PTC26
R303
LPUART13_RX signal is routed to FTDI
interface
Default configuración
LPUART13_TX
PTC27
R309
LPUART13_TX signal is routed to FTDI
interface
Default configuración
2
LPUART6_RX
PTA15
R302
LPUART6_RX signal is routed to FTDI
interface
LPUART6_TX
PTA16
R308
LPUART6_TX signal is routed to FTDI
interface
1.
If the user want use or change to LPUART6 RX/TX, then:
•
R303 and R309 must be removed.
•
R302-0603-0ohms and R308-0603-0ohms must be populated
2.
If the user wants to use other LPUARTx RX/TX module of the MCU, the user can have access to the
USB to serial interface by the J677 header. For this use case R302, R303, R308 and R309 must be
removed.
•
For a LPUARTx RX/TX module under the domain voltage VDD_HV_A, the R293 must be
populated and R294 must be removed.
•
For a LPUARTx RX/TX module under the domain voltage VDD_HV_B, the R294 must be
populated and R293 must be removed.
The USB to Serial UART interface in the EVB has two options to configure.
•
USB Bus powered configuration.
•
USB Self powered Configuration.
USB Bus Powered Configuration (Default Configuration).
The USB Bus Powered device gets its power from the USB bus. Basic rules for USB Bus power devices are as follows:
▪
On plug-in, the device must draw no more than 100mA
▪
On USB Suspend the device must draw no more than 500μA.
▪
A High-Power USB Bus Powered Device (one that draws more than 100mA) should use the PWREN# pin to keep
the current below 100mA on plug-
in and 500μA on USB suspend.
▪
A device that consumes more than 100mA cannot be plugged into a USB Bus Powered Hub.
▪
No device can draw more that 500mA from the USB Bus.
USB Self Powered Configuration.
A USB Self Powered configuration gets its power from its own POWER SUPPLY and does not draw current from the USB bus. The basic
rules for USB Self power devices are as follows.
▪
A Self-Powered device should not force current down the USB bus when the USB Host or Hub Controller is powered
down.
▪
A Self Powered Device can take as much current as it likes during normal operation and USB suspend as it has its
own POWER SUPPLY.
▪
A Self Powered Device can be used with any USB Host and both Bus and Self Powered USB Hubs.