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3.2
Module Power-Up
The modules are supplied using one of two powering options:
From the on-board regulator that uses the main host supply (P5V) as input
From an external 3.3V source through connector (U319), by following the steps below:
Place a jumper between LDOS_OFF and P5V pins of U319 connector to disable the
on-board regulator
Apply external 3.3V at P3VX_HOST pins of U319 connector,
shown in the Figure1.
Each module has its own supply pins, labeled by the silkscreen, as shown below.
Figure 1: External Power Source
In both cases the +5V supply through the main power connector must be present to supply the
micro and other features.
3.3
Operating Conditions
The input voltage supply must follow the table below.
Parameter
Symbol
Condition
Min
Typical
Max
Unit
+5
P5V
Supply from (J5)
-
5
-
V
Table 1: Voltage Operating Conditions
3.4
Default Board Configuration
The default operation of the board consists of the following:
Module is supplied from on-board regulator:
LDOS_OFF pulled to GND
POWER_ON/OFF_A/B pulled to GND
SCL_A/B, SDA_A/B, INT_L_A/B and MODPRS_L_A/B are pulled-up by placing the
corresponding jumpers.
