Data Sheet

FSC‐BT630Datasheet
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 ShenzhenFeasycomTechnologyCo.,Ltdwww.feasycom.com
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4.11.2NFCTantennarecommendations
TheNFCTantennacoilmustbeconnecteddifferentialbetween NFC1andNFC2pinsofthedevice.
Twoexternalcapacitorsshouldbeusedtotunetheresonanceoftheantennacircuitto13.56MHz.
Therequiredtuningcapacitorvalueisgivenbythebelowequations:
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An antenna inductance of L
ant
 = 2μH will give tuning capacitors in the range of 130pF on each pin. For good
performance,matchthetotalcapacitanceonNFC1andNFC2.
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4.11.3Batteryprotection
If the antenna is exposed to a strong NFC field, current  may flow in the opposite direction on the supply due to
parasiticdiodesandESDstructures.
Ifthebatteryuseddoesnottoleratereturncurrent,aseriesdiodemustbeplacedbetween thebatteryandthedevice
inorderto
protectthebattery.
4.11.4References
NFCForum,NFCAnalogSpecificationversion1.0,www.nfc‐forum.org
NFCForum,NFCDigitalProtocolTechnicalSpecificationversion1.1,www.nfc‐forum.org
NFCForum,NFCActivityTechnicalSpecificationversion1.1,www.nfc‐forum.org
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5.ELECTRICALCHARACTERISTICS
 5.1AbsoluteMaximumRatings
Absolutemaximumratingsforsupplyvoltageandvoltagesondigitalandanaloguepinsofthemodulearelistedbelow.
Exceedingthesevaluescausespermanentdamage.
The average PIO pin  output current is defined as the average current value flowing through any one of the