Ublox SARA-N2 Series, Руководство по системной интеграции

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SARA-N2 / N3 series - System integration manual
UBX-17005143 - R13 Design-in Page 41 of 95
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2.2.3 Interfaces supply output (V_INT)
2.2.3.1 Guidelines for V_INT circuit design
The V_INT digital interfaces supply output can be mainly used to:
• Indicate when the SARA-N2 module s’ radio is on (see section 1.6.1 for more details)
• Indicate when the SARA-N3 module is on (see section 1.6.1 for more details)
•
Supply external devices, as voltage translators, instead of using an external discrete regulator
• Pull-up SIM detection signal (see section 2.5 for more details)
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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
[1] and SARA-N3 series data sheet [2] describes the electrical characteristics.
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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 (HBM 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 Test-Point directly accessible for diagnostic purpose
2.2.3.2 Guidelines for V_INT layout design
There are no specific layout design recommendations for V_INT output.