Speaker Click Board™

Product Code: MIKROE-4662

How Does The Speaker Click Board™ work? The Speaker Click Board™ as its foundation uses the MAX9717, a 1.4W mono bridge-tied load (BTL) architecture audio power amplifier with a high-quality audio reproduction from Maxim Integrated. It delivers 1.4W continuous power into a 4Ω load from a single +5V supply, or 350mW continuous power into an 8Ω load while operating from a single +3.3V supply. This device features Maxim's industry-leading, comprehensive click-and-pop suppression that reduces audible clicks and pops during Start-Up and Shutdown sequence. Output signal reproduction is possible through the onboard speaker, as well as through the headphone jack located on the bottom side of this Click board™. The Speaker Click Board™ communicates with MCU using two GPIO pins routed on the PWM and INT pins of the mikroBUS™ socket labelled B/S and PWR. The MAX9717 features a low-power shutdown mode that reduces quiescent current consumption to 10nA. Entering shutdown mode is possible through the PWR pin, which disables the bias circuitry, and forces the amplifier outputs to GND through an internal 20kΩ resistor.

Driving the PWR to a low logic state will cause MAX9717 to enter shutdown mode while the high state will perform a normal operation. As mentioned before, this Click board™ has an onboard speaker, a 20mm 4Ω Premium Micro Transducer for sound reproduction. This speaker features a neodymium-iron-boron magnet, a light aluminium cone, and a high-temperature polycarbonate frame together with low resonant frequencies and a full-range bandwidth. Also, the MAX9717 features a headphone sense input pin, labelled as B/S, that senses headphone connection to the device through a 3.5mm jack connector labelled as HEADPHONES. This feature is muting the speaker while driving the headphone as a single-ended load. An adjustable potentiometer labelled as GAIN serves to adjust the gain of the MAXS9717's internal amplifier. The Speaker Click Board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it allows both 3.3V and 5V capable MCUs to use the GPIO lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development. SPECIFICATIONS Type Speakers Applications Can be used for portable audio applications such as PDAs and portable devices where space and cost are of great importance. On-board modules MAX9717 - 1.4W mono bridge-tied load (BTL) architecture audio power amplifier with a high-quality audio reproduction from Maxim Integrated Key Features 1.4W mono audio amplifier, 10nA low-power Shutdown mode, no audible clicks or pops, adjustable gain option, headphone sense feature, and more. Interface GPIO Compatibility mikroBUS Click board size L (57.15 x 25.4 mm) Input Voltage 3.3V or 5V PINOUT DIAGRAM This table shows how the pinout on the Speaker Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes NC 1 AN PWM 16 B/S Headphone Sense NC 2 RST INT 15 PWR Shutdown NC 3 CS RX 14 NC NC 4 SCK TX 13 NC NC 5 MISO SCL 12 NC NC 6 MOSI SDA 11 NC Power Supply 3.3V 7 3.3V 5V 10 5V Power Supply Ground GND 8 GND GND 9 GND Ground ONBOARD SETTINGS AND INDICATORS Label Name Default Description LD1 PWR - Power LED Indicator JP1 VCC SEL Left Logic Level Voltage Selection 3V3/5V: Left position 3V3, Right position 5V VR1 GAIN - Gain Adjustm