Product Introduction
TF card MP3 decoder board decoder module 3.7-5V power supply with 2W mixed mono memory player module
TF card MP3 decoder board, without TF card, supports playback of MP3 music files, currently tested 16G TF card support, the larger one has not been tested yet
3.7 Lithium battery or USB 5V can be powered,
product manual
The 3 groups of white boxes in the upper right corner of the board are 3 groups of touch buttons, the middle group is the play pause key, the up and down 2 groups are short presses for the up and down music keys, and the up and down 2 groups are long press for the volume +- adjustment.
If there is a customer who needs to modify the U disk to play, please ask the shopkeeper for information. If the hands are not strong, it is not recommended to change it, in case the board is burned. It is recommended to use USB 5V to change the U disk to play, because some old-fashioned U disks are 5V. The power supply does not support the 3.7V voltage of the lithium battery, so when the lithium battery is powered, the USB flash drive cannot be played. The new USB flash drive can play normally as long as it supports 3.7V power supply.
With 2W mono power amplifier, the maximum output of the power amplifier is 3W when powered by 5V (it is recommended to match the small speaker on the 4 ohm 3W card small speaker, the sound quality is good, the sound is loud, if the volume is not enough, please change directly to 4 ohm 5W The loudspeaker, the sound is so loud that it scares you, absolutely pleasantly surprised, hehe. After changing to a 4 ohm 5 watt speaker, pay attention to the heat dissipation of the power amplifier chip, it is best to add a heat sink)
Some customers reported that when the amplifier is playing music, it will generate heat. It is normal for the amplifier chip or the amplifier tube to heat up. As long as the amplifier is not turned on to a high volume, the output terminal of the speaker (resistance value 0 ohm) will not burn the amplifier. The chip can be used with confidence.
Some customers need to go back and use this board as the pre-amplifier of the power amplifier. You don’t need the power amplifier of this board. Go back and connect the power amplifier yourself. You can modify it as follows, remove the power amplifier chip (8-pin chip) of the board, and then remove the power amplifier chip from the main control. Pin 4 and Pin 6 (these two pins are the left and right channel output of the main control chip), connect a 104 (or 224) capacitor in series to the input end of the power amplifier (the capacitor acts as an isolation to prevent the same power supply When burning the front-level main control chip or the later power amplifier tube), the remaining wire is connected from the negative terminal to the common terminal of the power amplifier input
If a customer needs 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 remove the 4th and 6th pins of the main control (the two pins are the left and right sides of the main control chip). Channel output), connect a 104 (or 224) capacitor in series to the left and right channels of the earphone, and connect the remaining wire from the negative terminal to the common end of the earphone
Auto play after power-on
Loop playback with memory function, the next time the power is turned on, the track played last time will be played again
Play. With LED indicator display
PCB board size 34.23MM (left and right distance) * 22.33MM (up and down distance) * 1MM (thickness)
Appearance maximum size 37.09MM (left and right maximum distance) * 22.33MM (up and down maximum distance) * 2.97MM (maximum thickness)
A 3.7V600MA lithium battery (043545), after fully charged, the maximum volume can be used for about 3.5 hours, very power saving
XFW-MP3 is a chip designed for MP3 players with FM radio and LineIn functions.
2. Main features
Support MP3 playback format.
It can play T card/SD card, U disk, FM, and external audio source (LineIn), after inserting and playing first, and can also be switched by Mode key.
Automatically detect whether the earphone is plugged in, and then directly switch the external power amplifier through the IO port (Mute) without the need for an external transistor.
Supports storing the volume, number of songs,... in T card/SD card, U disk, users can save EEPROM
It can automatically detect whether there is an external EEPROM and decide whether to store the settings in EEPROM or T card/SD card, U disk.
One AD-key port is used to realize various key combinations.
There are two groups of AD-key keyboards to choose from.
Support 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 film.
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 ground.
4 DACOL DACL left channel audio signal output.
5 VCOM Vref The center point of the audio signal, please connect an external 1uF capacitor to stabilize it.
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 external
Hanging FM radio IC. If IOA3 is left floating, the FM radio IC must
You must connect the 32768Hz crystal oscillator yourself.
10 IOA2 Mute Mute: Mute the external power amplifier.
11 DM DM USB's DM.
12 DP DP DP of USB.
13 IOA0 IO-key/LED (1) External LED light: output "1" is to turn on the LED.
(2) At the same time as IO-key1.
(3) At the same time as a function option, it is used to define the key mode.
14 IOB1 SD_CLK
SD_DET
SD_CLK: clock output of T card/SD card.
SD_DET: Detect whether the SD card is inserted. Reading "0" means it is inserted.
Please connect a 3.3KΩ resistor to ground.
15 IOB0 SD_CMD
I2C_CLK
SD_CMD: command and response of T card/SD card.
I2C_CLK: I2C clock; external EEPROM and FM.
16 IOB2 SD_DAT
I2C_DAT
SD_DAT: data input/output of T card/SD card.
I2C_DAT: I2C data; 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 the four buttons S1~S4 are in MP3 playback mode (that is, playing U disk and
The behavior of playing 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 IOA0/LED without Roption as "Key Mode One", and with Roption as "Key Mode Two".
(5-2) Definition of button nouns:
[Prev ]: Previous, play the previous MP3.
[Next ]: Next, play the next MP3.
[P/P ]: Play/Pause, switch 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-, decrease the volume.
[V-- ]: Volume--, long press will continue to decrease the volume until the button is released.
[Scan ]: Scan ALL FM-band, re-search for 87.5MHz~108.0MHz automatically, and set the radio channel with signal
Store it up. Store up to 50 units.
[Scan+ ]: Search for stations to 108MHz, search for the nearest valid station from the current channel to 108MHz, and then stop to play
The radio station.
[Scan- ]: Search for stations to 87.5MHz, search for the nearest valid station from the current channel to 87.5MHz, and then stop to play
The radio station.
[CH+ ]: Skip to the next (frequency +) stored FM radio station to play.
[CH- ]: Skip to the previous (frequency-) stored FM radio station to play.
[RW]: Rewind, MP3 rewind.
[FF ]: Fast Forward, MP3 fast forward.
[Mode]: Mode switching" The sequence is SD card/T card U disk FM Line In; cyclic switching.
If you use the Mode key to switch to the corresponding mode, the playback media in the corresponding mode must exist, otherwise it will automatically skip to the next mode.
formula. For example, if you use the Mode key to switch to Line In Mode, you must insert the Line In line to be effective.
When not inserted, it will automatically switch to the next Mode.
[Repeat]: Switch between two cycle modes, All (full cycle)? Single (single cycle).
[EQ ]: Sound field effect "Normal (normal) Classic (classical) Bass (heavy bass) Live (live) Rock (shake
