TF card MP3 decoder board decoding module 3.7-5V power supply with 2W hybrid mono memory player module

TF card MP3 decoder board decoding module 3.7-5V power supply with 2W mixed mono with memory playback volume memory

TF card MP3 decoder board, without TF card, support for playing MP3 music files, currently testing 16G TF card support, no big test yet

3.7 lithium battery or USB 5V can supply power,

The three groups of white boxes in the upper right corner of the board are 3 groups of light touch buttons, the middle group is the play pause button, the upper and lower groups are short pressed for the up and down song keys, and the upper and lower groups are long pressed for the volume +- adjustment.

It is recommended to use USB 5V for U disk playback, because some old U disk is 5V power supply, and does not support 3.7V voltage of lithium battery. Therefore, when the lithium battery is powered, the U disk cannot be played. The new U disk only supports 3.7V. The power supply can be played normally.

With 2W mono power amplifier, the maximum output of the power amplifier is 3W when 5V power supply (it is recommended to match the small speaker on the small speaker of 4 Euro 3W card, the sound quality is good, the sound is very loud, if you think the volume is not enough, please change 4 Euro 5W directly. Speaker, the sound is so big that it scares you. After changing the 4 Euro 5W speaker, pay attention to the heat dissipation of the amplifier chip, it is best to add the heat sink)

There are customers who reflect the power when playing music, there will be fever, power amplifier chip or power amplifier tube heating is normal, as long as the amplifier is not turned to a large volume, the output of the short-circuit speaker (resistance 0 ohms) will not burn The chip can be used with confidence.

Some customers need to go back and use this board as the preamp of the amplifier. You don't need the amplifier of this board. Go back to your own amplifier. You can modify the board as follows, remove the board's power amplifier chip (8-pin chip), and then from the main control 4 feet and 6 feet (these two feet are the left and right channel outputs of the main control chip), each of which is connected with a 104 (or 224) capacitor to the input end of the power amplifier (the capacitor acts as an isolation to prevent the same power supply) When the front stage master chip or the later power amplifier tube is burned, the remaining line is connected from the negative pole to the common end of the power amplifier input.

Some customers need to go back and modify this board to listen to music with headphones, remove the board's power amplifier chip (8-pin chip), and then from the main 4th and 6th feet (the two feet are the main control chip) Channel output), each connected in series with a 104 (or 224) capacitor to the left and right channels of the headphones, leaving a line from the negative terminal to the common end of the headphones

Power on automatically

Loop playback with memory function, continue to play from the last played track after the next power-on

Play. With LED indicator

PCB board size 34.23MM (left and right distance) * 22.33MM (up and down distance) * 1MM (thickness)

Maximum size of appearance 37.09MM (maximum distance left and right) *22.33MM (maximum distance up and down) *2.97MM (maximum thickness)

A 3.7V600MA lithium battery (043545), after fully charged, the maximum volume can be used for about 3.5 hours, which is very energy-saving.

 

Master chip introduction

1 Overview

The GPD2846A is a chip designed for MP3 players with FM radio and LineIn capabilities.

2. Main features

Support MP3 playback format.

It can play T card/SD card, U disk, FM, and external audio source (LineIn), then insert the first broadcast, or switch by Mode key.

It automatically detects whether the earphone is plugged in, and accordingly, the external power amplifier is directly switched by the IO port (Mute), and the external triode is not required.

Support to store the volume, number of songs, ... in T card / SD card, U disk, user can save EEPROM

It can automatically detect whether the external EEPROM is used and decide whether to store the settings in EEPROM or T card/SD card or USB flash drive.

A variety of key combinations are implemented with one AD-key port.

There are two sets of AD-key keyboards to choose from.

Supports 3 FM radio chips: RDA5807, BK1080 and RTC6207E.

Infrared remote control is not supported.

USB device mode is not supported.

Support for USB audio mode.

Package type: SOP16 package.

3. Product application

MP3 player with FM radio function, no screen mini speaker.

 

4. Pin definition

Pin # Pin Name Description

1 V33REG DVDD33 Digital power supply 3.3V.

2 V50REG VMCU/BAT lithium battery input, 3.3V~5V.

3 VSSREG DVSS Digital signal ground.

4 DACOL DACL Left channel audio signal output.

5 VCOM Vref The center point of the audio signal, please external 1uF capacitor regulator.

6 DACOR DACR Right channel audio signal output.

7 LINEIN_R LineInR+L LineIn left + right input.

8 IOA4 AD-key button.

9 IOA3 FMCLK If IOA3 has a pull-down resistor to ground, IOA3 will output a clock signal to the outside.

Hanging FM radio IC. If the IOA3 is left floating, the FM radio IC must

You must connect yourself to a 32768Hz crystal.

10 IOA2 Mute Mute: Mute the external amplifier.

11 DM DM USB DM.

12 DP DP USB DP.

13 IOA0 IO-key/LED (1) External LED: Output "1" is the representative LED.

(2) Also as IO-key1.

(3) Also used as a function option to define the button mode.

14 IOB1 SD_CLK

SD_DET

SD_CLK: Clock output of T card/SD card.

SD_DET: Detects whether the SD card is inserted. Reading "0" means inserting.

Please connect a 3.3KΩ resistor to the ground.

15 IOB0 SD_CMD

I2C_CLK

SD_CMD: The command and response of the T/SD card.

I2C_CLK: clock of I2C; external EEPROM and FM.

16 IOB2 SD_DAT

I2C_DAT

SD_DAT: Data input/output of T card/SD card.

I2C_DAT: data of I2C; external EEPROM and FM.

GPD2846

 

 

5. AD-key button operation function

(5-1) AD-key has a total of eight buttons S1~S8, among which S1~S4 are playing in MP3 mode (ie playing U disk and

The behavior of playing the SD card/T card is determined by whether the IOA0/LED pin has an external pull-up resistor.

Please pull up to V33REG through a 22KΩ resistor.

We call the IOP0/LED not hanging Loopion "button mode one", and the hanging Looption is called "button mode two".

(5-2) Key noun definition:

[ Prev ]: Previous, play the previous MP3.

[ Next ]: Next, play the next MP3.

[P/P]: Play/Pause, switches between play and pause.

[ V+ ]: Volume+, increase the volume.

[ V++ ]: Volume++, long press will continue to increase the volume until the button is released.

[ V- ]: Volume-, reduce the volume.

[ V-- ]: Volume--, long press will continue to decrease the volume until the button is released.

[ Scan ]: Scan ALL FM-band, re-automatically search 87.5MHz~108.0MHz and put the signaled radio channel

Save it up. Store up to 50 units.

[ Scan+ ]: Search at 108MHz, search for the nearest valid station from the current channel to 108MHz, then stop to play

The station.

[ Scan- ]: Search at 87.5MHz, search for the nearest valid station from the current channel to 87.5MHz, then stop to play

The station.

[ CH+ ]: Skips to the next (frequency +) stored FM radio station.

[ CH- ]: Skips to the previous (frequency -) stored FM radio station.

[ RW ]: Rewind, MP3 rewinds.

[ FF ]: Fast Forward, MP3 fast forward.

[ Mode ]: Mode switching" sequence is SD card / T card U disk FM Line In; cycle switching.

If the Mode button is used to switch to the corresponding mode, the playback media in the corresponding mode must exist, otherwise it will automatically jump to the next mode.

formula. For example, if you switch to Line In Mode with the Mode button, you must insert the Line In line to work. If you find and

When not inserted, it will automatically switch to the next Mode.

[ Repeat ]: Switch between two loop modes, All (full loop) ? Single (single loop).

[ EQ ]: Sound field effect "Normal" Classic (Basic) Bass (Subwoofer) Live (Field) Rock (Shake

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