Figure 3-40. VLDO2 Load Connector
3
1
2
BSS138
Q4
GND
RED
D3
VDD_MAIN
VLDO2
1
2
DNP
J14
DNP
GND
1k
0402
5%
R87
3.8.2
VDD_1V8 Power Measurement Connector
The ATSAMA5D27-WLSOM1 module embeds an LDO with capacities of:
• Output voltage @ 1.8V only
• Output current capability up to 900mA
A 2-pin connector (J15), not populated by default, is available on the baseboard to measure output current capability
of the VDD_1V8 regulator.
Note:
The maximum current available on VDD_1V8 node is approximately 900mA max @ 1.8V.
Figure 3-41. VDD_1V8 Load Connector
3
1
2
BSS138
Q5
GND
RED
D4
VDD_MAIN
1
2
DNP
J15
DNP
GND
VDD_1V8
1k
0402
5%
R88
3.8.3
VTH Threshold
The ATSAMA5D27-WLSOM1 module mounted on the base board integrates a Voltage Supervisor MIC842.
A resistor ladder is mounted on the ATSAMA5D27-WLSOM1-EK1 board and detects a voltage drop when reduced to
4.64V.
It is possible to change this resistor ladder, values or reference if, for test purposes, another voltage reference is
monitored (e.g. 12V). If the reference voltage is above 5.5V, then R60 should be removed (unsoldered).
ATSAMA5D27-WLSOM1-EK1
Baseboard Components
©
2019 Microchip Technology Inc.
User Guide
DS50002931A-page 42
