2x5W AMP click
PID: MIKROE-2477
2x5W AMP click functions as an amplifier and features the TDA7491LP 2x5-watt dual BTL
class-D audio amplifier. The click is designed to run on either 3.3V or 5V power supply. It
communicates with the target MCU over the following pins on the mikroBUS™ line: AN, RST,
CS, PWM, INT.
2x5W AMP click features a 3.5mm input jack and four output screw terminals for connecting
passive speakers.
Note: In order to achieve full 2x5W output power, keep in mind that you need to supply enough
current to the chip.
This is achievable with the EXT PWR header, but you need to switch over the AMP VCC to the
left position.
Note: a 3.5mm stereo cable and wired passive speakers are not included in the offer.
Class‐Daudioamplifier
Class-D audio amplifiers (switching amplifiers) are very energy efficient. They reduce power
losses on the output device by operating as an electronic switch, rather than as linear gain
devices, like in A or AB amplifiers.
These kinds of amplifiers are ideal for compact, high power applications.
TDA7491LPaudioamplifier
The amplifier has three operating modes:
Standby mode: all circuits are turned off, very low current consumption. The amplifier uses a
maximum of 10uA in standby mode.
Mute mode: inputs are connected to ground and the positive and negative PWM outputs are at
50% duty cycle.
Play mode: the amplifiers are active.
Simplecontrol
The click does not use a standard serial communication, like I2C or SPI - it's controlled by a few
pins on the mikroBUS™ line. The state of these pins can either be HIGH or LOW (mute, gain,
enable). The operating modes and gain are set with input pins.
Keyfeatures
TDA7491LPaudioamplifier
o Class‐Daudioamplifier
o 2x5Woutputpower
o Short‐circuitprotection
o Thermaloverloadprotection
o Standbyandmutefeatures
3.5mmaudiojack
Screwterminalsforspeakeroutput
Interface:AN,RST,CS,PWM,INT
3.3Vor5Vpowersupply
SPECIFICATION
Product Type Amplifier
Applications Mobile phones, portable sound systems, etc.
On-board
modules TDA7491LP 2x5-watt dual BTL class-D audio amplifier
Key Features 2x5W output power, short-circuit protection, thermal overload protection,
3.5mm audio jack, screw terminals for passive speakers.
Interface AN, RST, CS, PWM, INT pins
Power Supply 3.3V or 5V
Compatibility mikroBUS
Click board size L (57.15 x 25.4 mm)
Pinoutdiagram
This table shows how the pinout on 2x5W AMP click corresponds to the pinout on the
mikroBUS™ socket (the latter shown in the two middle columns).
NotesPin
mikroBUStm
PinNotes
Gain0pinGN01ANPWM 16 MUTE Mutecontrol
Gain1pinGN12RSTINT15 DIADiagnosticpin
StandbycontrolSTB3CSTX14 NCNotconnected
NotconnectedNC4SCKRX13 NCNotconnected
NotconeectedNC5MISOSCL12 NCNotconnected
NotconnectedNC6MOSISDA11 NCNotconnected
Powersupply+3.3V73.3V5V10 +5VPowersupply
GroundGND8GNDGND9GND Ground
Jumpersandsettings
DesignatorNameDefault
Position
Default
OptionDescription
JP1AMP
VCCRight5VAMPpowersupply,canbe5Vorexternal(5V‐
14V)
LEDs,buttons,connectorsandswitches
DesignatorNameType(LED,BUTTON...) Description
EXTPWREXTPWRConnectortwopinnon‐populatedheaderfortheexternalAmpsupply
Programming
The library has two helper functions for setting the gain and the mode via output pins.
Codesnippet
The demo shows how to initialize, set the mode and the gain of the click.
01 void main()
02 {
03 system_init();
04
05 click_2x5W_gain(CLICK_2X5W_AMP_20_DB);
06 click_2x5W_mode(CLICK_2X5W_AMP_MODE_PLAY);
07
08 while( 1 )
09 {
10 if(Button(&GPIOE_IDR, 11, 100, 1))
11 {
12 click_2x5W_gain((click_2x5w_amp_gain_t)(++gain % 4));
13 }
14 }
15 }
https://shop.mikroe.com/click/audio-and-voice/2x5w-amp 2/24/2017
