TF Card MP3 Deer Board Module 3.75V Lithium Battery Power Supply With 2W Mixed Mono Memory Playback Function

is_customized : YesModel Number : deing board deing moduleOperating Temperature : n/aDissipation Power : n/aSupply Voltage : n/aApplication : ComputerCondition : NewType : ModuleBrand Name : SZYTF : Mainland China
TF card MP3 deing board deing module 3.7-5V power supply with 2W mixed mono with memory play volume memory
 
TF card MP3 deing board, no TF card, support to play MP3 music files, the current test 16G TF card support, no matter how large has not been tested
 
3.7 Lithium battery or USB 5V can be powered,
 
The three groups of white boxes in the upper right corner of the board are three groups of tap keys, the middle group is the play pause key, the two groups of short press up and down are the up and down crank keys, and the two groups of press up and down are the volume +- adjustment.
 
It is recommended to use USB 5V power supply, because some old USB disk is 5V power supply, do not support the 3.7V voltage of lithium battery, so the lithium battery power supply, resulting in the USB disk can not play, the new USB disk as as it supports 3.7V power supply can be played normally.
 
With 2W mono amplifier, 5V power supply power amplifier output 3W (recommended with 4 €3W card small speaker, good sound quality, loud sound, if you feel the volume is not enough, please directly change 4 €5W speaker, the sound is loud to scare you. After changing the 4 €5 watt horn, pay attention to the power amplifier chip heat dissipation oh, good to add heat sink)
 
Some customers reflect that when the power amplifier plays music, there will be heat phenomenon, the power amplifier chip or the power amplifier tube is normal, as as the power is not released to the large volume, the output end of the short-circuit horn (resistance 0 ohm) will not burn the power amplifier chip, you can rest assured that it can be used.
 
Some customers need to go back to the board as the amplifier before, do not need the power amplifier of this board, go back to their own power amplifier, can be modified as follows, remove the board's power amplifier chip (8-pin chip), and then from the main control of the fourth and sixth feet (these two feet are the left and right channel output of the main control chip), Each series a 104 (or 224) capacitor to the input end of the power amplifier can be (the capacitor acts as an isolation function to prevent the same power supply when burning the front main control chip or the later power amplifier tube), the remaining line from the negative terminal 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 power amplifier chip (8-pin chip) of the board, and then from the fourth and sixth feet of the main control (these two feet are the left and right channel output of the main control chip), each series a 104 (or 224) capacitor to the left and right channel of the headset, leaving a wire from the negative terminal to the common end of the headset
 
Power on and play automatically
 
Loop play with memory function, continue to play from the last play after the next power-on
 
Play. With LED indicator display
 
PCB board size 34.23MM (left and right distance) *22.33MM (up and down distance) *1MM (thickness)
 
Appearance Large size 37.09MM (left and right large distance) *22.33MM (upper and lower large distance) *2.97MM (large thickness)
 
A 3.7V600MA lithium battery (043545), after full power, open the volume can be used for about 3.5 hours, very power-saving
 
Main control chip introduction
1. Overview
GPD2846A is a chip designed for MP3 players with FM radio function and LineIn function.
 
2. Main features
Support MP3 playback format.
It can play T card /SD card, U disk, FM, and external sound source (LineIn), and can also be switched by the Mode key.
Automatically detect whether the headset is inserted, and thus directly switch the external power amplifier through the IO port (Mute), without the need for external triode.
Supports volume, number of songs,... Stored in T card /SD card, U disk, users can save EEPROM
Can automatically detect whether external EEPROM and decide whether to store Settings in EEPROM or T card /SD card, U disk.
One AD-key port is used to implement various key combinations.
There are two 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 USB audio mode.
Package type: SOP16 package.
 
3. Product application
MP3 player with FM radio function, mini speaker without screen.
 
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 grounding.
4 DACOL DACL left channel audio signal output.
5 VCOM Vref audio signal center point, please external 1uF capacitor voltage regulator.
6 DACOR DACR right channel audio signal output.
7 LINEIN_R LineInR+L Input left and right of LineIn.
8 IOA4 AD-key Key.
9 IOA3 FMCLK If IOA3 has a pull-down resistance to the ground, IOA3 outputs a clock signal to the outside
Hung FM radio IC. If IOA3 is suspended, the FM radio IC must be
Must be connected to 32768Hz crystal oscillator.
10 IOA2 Mute Mute: Mute the external power amplifier.
11 DM DM Indicates the USB DM.
12 DP DP Indicates the USB DP.
13 IOAIo-key /LED (1) External LED light: The output "1" indicates that the LED is lit.
(2) It is also used as IO-key1.
(3) At the same time, it is also a functional option to define the key mode.
14 IOB1 SD_CLK
SD_DET
SD_CLK: clock output of the T /SD card.
SD_DET: Detects whether the SD card is inserted. If "0" is read, the SD card is inserted.
Please connect a 3.3KΩ resistor to the ground.
15 IOB0 SD_CMD
I2C_CLK
SD_CMD: command and response of the T /SD card.
I2C_CLK: indicates the clock of I2C. External EEPROM and FM.
16 IOB2 SD_DAT
I2C_DAT
SD_DAT: data input/output of the T /SD card.
I2C_DAT: indicates I2C data. External EEPROM and FM.
GPD2846
 
 
5. AD-key Key operation function
(5-1) AD-key has a total of eight keys from S1 to S8, among which the four keys from S1 to S4 are in MP3 playing mode (that is, playing USB flash drive and
The behavior of playing SD card /T card is determined by whether the IOA0/LED foot has an external pull-up resistor.
Please pull up to V33REG through 22KΩ resistor.
We call IOA0/LED without hanging Roption "key mode one", and Roption with hanging is called "key mode two".
(5-2) Key noun definition:
[Prev] : Previous: plays the previous MP3.
[Next] : Next, play the next MP3.
[P/P] : Play/Pause: switches between play and pause.
[V+] : Volume+ : Increases the volume.
[V++] : Volume++, press will continue to increase the volume until you release the on.
[V-] : Volume- decreases the volume.
[V--] : Volume--, and press will continue to reduce the volume until the key is released.
[Scan] : Scan ALL FM-band, automatically search 87.5MHz to 108.0MHz, and search the radio channels that have signals
Put it in storage. Store 50 more.
[Scan+] : Search to 108MHz, from the current channel to 108MHz direction to search for the nearest valid station, and then stop to play
The radio station.
[Scan-] : Search to 87.5MHz, from the current channel to 87.5MHz, search for a nearby valid station, and then stop to play
The radio station.
[CH+] : Skip to the next (frequency +) stored FM station to play.
[CH-] : Skip to the previous (frequency -) FM station that has been stored to play.
[RW] : Rewind, MP3 back.
[FF] : Fast Forward.
[Mode] : The Mode switch sequence is FM Line In SD card /T card USB flash drive. Loop switch.
If the Mode key is used to switch to the corresponding mode, the playback media in the corresponding mode must exist; otherwise, the system automatically jumps to the next mode
Style. For example, if you use the Mode key to switch to Line In Mode, it only works after you insert a Line In line
When not inserted, it automatically cuts to the next Mode.
[Repeat] : Switch between two loop modes, All (full loop)? Single (single loop).
[EQ] : sound field effect "Normal (normal) Classic (classical) Bass (heavy bass) Live (live)Rock (rock)