Troubleshooting guide

MFB 13 MultiFunctionalButton VREGENABLE_H
5V 14 Lithium ion/polymer battery charger
input
VDD_CHG
BATT 16 Lithium ion/polymer battery positive
terminal.Battery
charger output and input to
switchmoderegulator
BAT_P
MOSI 17 SPIdatainput Input, with weak
internalpulldown
CLK 18 SPIclock Bidirectional with
weak internal
pulldown
CSB 19 ChipselectforSPI,activelow Bidirectional with
weak internal
pulldown
MISO 20 SPIdataoutput Bidirectional with
weak internal
pulldown
SPI_EN 21 Debuginterfaceinput

Input with strong
internalpulldown
1.9V 22 Highvoltageregulatoroutput VREGOUT_H
MIC_BIAS 23 Microphonebias Analogue
MIC_P 24 Microphoneinput,positive Analogue
MIC_N 25 Microphoneinput,negative Analogue
SPK_N 26 Speakeroutput,negative Analogue
SPK_P 27 Speakeroutput,positive Analogue
RF_OUT 29 SPIclock  Transmitter
output/switched
receiver
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