BM20 datasheet(6/46 Pages) MICROCHIP

Part #	BM20

Description	Bluetooth짰 4.1 Stereo Audio Module

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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6 / 46 page

Stereo Module

 2015 Microchip Technology Inc.

Page 6

Preliminary Edition

Pin No.

Pin type

Name

Description

9

O

SPKL

L-channel analog headphone output

10

P

VDDA

Positive power supply/reference voltage for CODEC, no need to add power

to this pin.

11

I

MIC1_P

Mic 1 mono differential analog positive input

12

I

MIC1_N

Mic 1 mono differential analog negative input

13

P

MIC_BIAS

Electric microphone biasing voltage

14

I

AIR

R-channel single-ended analog inputs

15

I

AIL

L-channel single-ended analog inputs

16

I

RST

System Reset Pin, Low: reset

17

P

VCC_RF

1.28V RF LDO output, no need to add power to this pin.

18

I/O

P0_1

IO pin, default pull-high input (Note 1)

1. FWD key when class 2 RF (default), active low.

2. Class1 TX Control signal of external RF T/R switch, active high.

19

P

VDD_IO

Power output , no need to add power to this pin

20

P

ADAP_IN

5V Power adaptor input

21

P

BAT_IN

3.3V~4.2V Li-Ion battery input

22

-

NC

No Connection

23

P

GND

Ground Pin

24

P

SYS_PWR

System Power Output

BAT mode: 3.3~4.2V

Adapter mode: 4.0V

25

P

BK_OUT

1.8V buck output, no need to add power to this pin

26

I

MFB

1. Power key when in off mode

2. UART_RX_IND: MCU use to wakeup BT (Note 1)

27

I

LED1

LED Driver 1

28

I

LED2

LED Driver 2

29

I

P2_4

IO pin, default pull-high input

System Configuration,

L: Boot Mode with P2_0 low combination

30

I

P0_2

IO pin, default pull-high input (Note 1)

Play/Pause key (default), active low.

31

I/O

P0_3

IO pin, default pull-high input (Note 1)

1. REV key (default), active low.

2. Buzzer Signal Output

3. Out_Ind_1

4. Class1 RX Control signal of external RF T/R switch, active high.

32

O

HCI_TXD

HCI-UART TX data

33

I

HCI_RXD

HCI-UART RX data

34

I

P0_5

IO pin, default pull-high input (Note 1)

Volume down (default), active low.

35

I

P2_7

IO pin, default pull-high input (Note 1)

Volume up key (default), active low.

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