NXP Semiconductors S32R274, User Manual

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Configuration
S32R274/372 EVB User Guide, Rev. 0, 08/2018
NXP Semiconductors 7
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1.25V_SR: 1.25 V switching regulator to supply the core voltage
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5V_SR: 5 V switching regulator to supply the power management controller, I/O and peripherals
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3.3V_SR: 3.3 V switching regulator for Ethernet, FlexRAY, debug and I/O
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5V_LR: 5 V linear regulator for ADC supply and reference
All of the regulators have the option of being disabled/enabled if they are not required. By default
(jumpers are off), all of the switching regulators are enabled and the 5 V linear regulator is disabled. The
regulators can be enabled individually by the following jumper settings:
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Connecting J57 enables the 5 V linear regulator
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Disconnecting J58 enables the 5 V switching regulator
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Disconnecting J59 enables the 3.3 V switching regulator
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Disconnecting J60 enables the 1.25 V switching regulator
The regulators supply power to the daughter cards through the board connector. The individual selection
and configuration of the MCU supplies are done on the daughter cards.
NOTE
Not all the supported daughter card MCUs require all the supplies to be
switched on. Please refer to the individual daughter card user guide for
details.
3.1.3.
Power switch, status LEDs and fuse
The main power switch (slide switch SW5) can be used to isolate the power supply input from the EVB
voltage regulators if required.
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Moving the slide switch to the right (away from connector P33) will turn the EVB on
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Moving the slide switch to the left (towards connector P33) will turn the EVB off
When power is applied to the EVB, four green power LEDs adjacent to the voltage regulators show the
presence of the supply voltages as follows:
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LED D9 – Indicates that the 5.0 V linear regulator is enabled and working correctly
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LED D11 – Indicates that the 5.0 V switching regulator is enabled and working correctly
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LED D12 – Indicates that the 3.3 V switching regulator is enabled and working correctly
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LED D13 – Indicates that the 1.25 V switching regulator is enabled and working correctly
If no LED is illuminated when power is applied to the EVB and the regulators are correctly enabled
using the appropriate jumpers, it is possible that either power switch SW5 is in the “OFF” position or
that the fuse F1 has blown. The fuse will blow if power is applied to the EVB in reverse-bias, where a
protection diode ensures that the main fuse blows rather than causing damage to the EVB circuitry. If
the fuse has blown, check the bias of your power supply connection then replace fuse F1 with a 20 mm
1.5 A fast blow fuse.