Everest CORE - Product Manual |
Application Guide
INGENIA | 08/01/2019
29
Second, 5 V is converted to 3.3 V by means of a simple LDO. The Everest CORE does not consume any current from
this 3.3 V, so it must be enough to cover the self-consumption of the Interface Board plus the amount of current to
be sent to external circuits (see 3.3 V and 5 V Output Supplies chapter below).
Signals description
Signal
Description
+5V_IN
Positive terminal of the 5 V logic supply input
0V_IN
Negative terminal of the 5 V logic supply input
+5V_D
+5 V Logic supply to feed both Everest CORE and the Interface Board. To be connected to pins 3, 4, 5
and 6 of Everest CORE Interface connector
+3.3V_
D
+3.3 V Logic supply to feed the Interface Board
GND_D
Logic supply reference voltage. To be connected to pins 1, 2, 7 and 8 of Everest CORE Interface
connector
Design Notes
•
D1 is a unidirectional TVS, meaning that in case of inverse polarity of the 5 V input this will conduce in direct
mode. Then, either the power supply voltage will drop once reached the maximum current or the TVS will
burn if the power supply is powerful enough. This behaviour is intended, as it works as a very basic inverse
polarity protection in addition to its main ESD protection function.
• +5V_D must be connected to pins
3, 4, 5 and 6
of Everest CORE Interface connector. It is recommended to
connect all 4 pins, leaving none unconnected. Similarly, all 4 pins
1, 2, 7 and 8
should be connected to
GND_D.
3.3 V pins from Everest CORE
Pins 9 and 10 of Everest CORE are not supply inputs, so this pins
must not be connected to a supply
.
Everest CORE is providing this 3.3 V supply outputs to avoid adding external electronics when only simple
external circuits are required. However, the maximum current to be drawn from this output is limited to
250 mA, and exceeding it might cause permanent damage to Everest CORE, so it is not used in this
application example.
