User's Manual

FreeWings Technologies Co., Ltd
Page 7 of 11
FW3817-30 Bluetooth Audio Module Datasheet V1.5
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SPK_RN Analog output Speaker output negative right
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SPK_RP Analog output Speaker output positive right
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SPK_LN Analog output Speaker output negative left
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SPK_LP Analog output Speaker output positive left
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GND VSS Ground
38
RF PORT Analog
Bluetooth signal input/output port
50Ohm
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GND VSS Ground
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NC N.C Not Connected
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NC N.C Not Connected
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NC N.C Not Connected
3 Electrical Characteristics
7.1 Reset
FW3817-30 module is reset from several sources.We suggest to use power-on reset,that means to leave the
RSTn pin floating:
● RSTn pin pulled low for minimum 5ms
● Power-on reset, leaving the RSTn pin floating. It should be that it was 0V voltage at any pin before reset.
● USB charger attach reset
● Software configured watchdog timer
7.2 Power on and power off
FW3817-30 module is power on from two sources:
● VREG_EN pin pulled high for minimum 100ms when VBAT pin is in the status of stable power.
● VREG_EN pin pulled high from low when VBAT pin is in the status of stable power.
The wrong timing sequence of VREN_EN and VBAT will lead to error of power on.
FW3817-30 module is power off from two sources:
● VREG_EN pin pulled high for minimum 100ms when VBAT pin is in the status of stable power.
● VREG_EN pin pulled low from high when VBAT pin is in the status of stable power.
The wrong timing sequence of VREN_EN and VBAT will lead to error of power off.
7.3 I/O
The driver power voltage of all the PIO port is 1.8V inside of the module.