SARA-N2 series - System Integration Manual
UBX-17005143 - R06
Design-in
Page 31 of 82
2.2.2
Interface supply (V_INT)
2.2.2.1
Guidelines for V_INT circuit design
The V_INT digital interfaces 1.8 V supply output can be mainly used to:
Indicate when the module is switched on, and radio is on (see section
☞
Do not apply loads that might exceed the limit for maximum available current from V_INT supply,
as this can cause malfunctions in internal circuitry supplies to the same domain. The SARA-N2
series Data Sheet
describes the detailed electrical characteristics.
☞
V_INT can only be used as an output; do not connect any external regulator on V_INT.
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V_INT supply output pin provides internal short circuit protection to limit start-up current and
protect the device in short circuit situations. No additional external short circuit protection is
required.
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ESD sensitivity rating of the V_INT supply pin is 1 kV (Human Body Model according to JESD22-
A114). Higher protection level could be required if the line is externally accessible on the application
board. Higher protection level can be achieved by mounting an ESD protection (e.g. EPCOS
CA05P4S14THSG varistor array) close to accessible point.
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It is recommended providing direct access to the V_INT supply output pin on the application board
by means of testpoint directly accessible for diagnostic purpose
2.2.2.2
Guidelines for V_INT layout design
There are no specific layout design recommendations for V_INT output.
