AC6936D IC Schematic Diagram & Datasheet
IC Number: AC6936D
Total Pins: 32
Crystal Frequency: 24 MHz
▶ Pin Descriptions
★ Pin 1: AGND
↳ Function: Analog Ground
↳ Details: This pin is the ground reference for the analog circuitry within the IC. It helps to stabilize the analog signals and reduce noise.
★ Pin 2: BT_AVDD
↳ Function: Bluetooth Analog Power Supply
↳ Details: This pin supplies power to the Bluetooth analog sections of the IC. It typically requires a clean, stable voltage source to ensure Bluetooth functionality.
★ Pin 3: ADDIO
↳ Function: Supply +3.3V
↳ Details: This pin provides the 3.3V power supply needed for certain internal functions of the IC. It's essential for the stable operation of various digital circuits inside the IC.
★ Pin 4: PB8 (Optional)
↳ Function: General-Purpose I/O
↳ Details: This is a general-purpose input/output pin that can be programmed for various functions as required by the user application.
★ Pin 5: PB7/AUX0R/ADC9 (Optional)
↳ Function: Multifunction Pin
↳ Details: This pin can be a general-purpose I/O, auxiliary right channel input, or an ADC (Analog-to-Digital Converter) input. The specific function is determined by the software configuration.
★ Pin 6: PB6/AUX0L/ADC8
↳ Function: Multifunction Pin
↳ Details: Similar to PB7, this pin serves multiple purposes, including acting as a general-purpose I/O, auxiliary left channel input, or ADC input.
★ Pin 7: PGND
↳ Function: Power Ground
↳ Details: This pin is the ground reference for the power supply circuitry. It's critical for providing a stable ground connection for power delivery.
★ Pin 8: SW
↳ Function: Switch Input
↳ Details: This pin is typically used for connecting a hardware switch or button, which can be used to trigger specific functions within the IC.
★ Pin 9: VBAT
↳ Function: Battery Voltage Input
↳ Details: This pin receives the battery voltage, which powers the IC. The voltage from the battery is regulated internally to supply various parts of the IC.
★ Pin 10: LDO_IN
↳ Function: Low Dropout Regulator Input
↳ Details: This pin is the input for the internal Low Dropout (LDO) regulator. It provides a stable voltage source for sensitive circuits within the IC.
★ Pin 11: BT_AVDD
↳ Function: Bluetooth Analog Power Supply
↳ Details: This is another pin for the Bluetooth analog power supply, providing redundancy and ensuring a stable power source for Bluetooth operations.
★ Pin 12: PB3/OSC32KI
↳ Function: Oscillator Input
↳ Details: This pin can be used as a general-purpose I/O or as an input for a 32 kHz oscillator, essential for timekeeping functions.
★ Pin 13: PB2/OSC32KO/ADC12
↳ Function: Oscillator Output / ADC Input
↳ Details: This multifunction pin serves as a general-purpose I/O, a 32 kHz oscillator output, or an ADC input, providing flexibility depending on the application needs.
★ Pin 14: PB1/ADC6
↳ Function: ADC Input
↳ Details: This pin functions as an ADC input, allowing for the conversion of analog signals to digital data for processing by the IC.
★ Pin 15: PB0
↳ Function: General-Purpose I/O
↳ Details: Another general-purpose I/O pin, which can be configured for a variety of input or output functions.
★ Pin 16: BT_RF
↳ Function: Bluetooth RF Input/Output
↳ Details: This pin is used for the RF (Radio Frequency) connection in Bluetooth communications. It is critical for transmitting and receiving Bluetooth signals.
★ Pin 17: GND
↳ Function: Ground
↳ Details: This pin provides a common ground reference for the digital and power circuits within the IC.
★ Pin 18: BT_OSCI
↳ Function: Bluetooth Oscillator Input
↳ Details: This pin connects to the oscillator input for the Bluetooth module, essential for generating the precise timing signals required for Bluetooth communication.
★ Pin 19: BT_OSCO
↳ Function: Bluetooth Oscillator Output
↳ Details: This pin outputs the oscillator signal from the Bluetooth module, used to synchronize internal and external circuits.
★ Pin 20: G_SDA
↳ Function: I2C Data Line
↳ Details: This pin is used for the data line in an I2C communication interface, allowing the IC to communicate with other I2C-enabled devices.
★ Pin 21: G_SCL
↳ Function: I2C Clock Line
↳ Details: This pin is the clock line for the I2C interface, providing the necessary timing for data transmission between the IC and other devices.
★ Pin 22: G_PWR
↳ Function: General Power Supply
↳ Details: This pin supplies general power to various parts of the IC, ensuring stable operation.
★ Pin 23: DVDD
↳ Function: Digital Power Supply
↳ Details: This pin provides the power supply for the digital circuits within the IC, typically at a voltage level suitable for digital logic.
★ Pin 24: USBDM
↳ Function: USB Data Minus
↳ Details: This pin is used for the differential data line (D-) in USB communications, facilitating data transfer with USB devices.
★ Pin 25: USBDP
↳ Function: USB Data Plus
↳ Details: This pin is the differential data line (D+) counterpart to USBDM in USB communications, essential for USB data transfer.
★ Pin 26: MIC_POWER
↳ Function: Microphone Power Supply
↳ Details: This pin supplies power to an external microphone, ensuring it operates correctly for audio input.
★ Pin 27: MIC
↳ Function: Microphone Input
↳ Details: This pin receives the audio signal from an external microphone, which is then processed by the IC.
★ Pin 28: DACR
↳ Function: Digital-to-Analog Converter Right Output
↳ Details: This pin outputs the right channel audio signal from the DAC, converting digital audio data to an analog signal.
★ Pin 29: DACL
↳ Function: Digital-to-Analog Converter Left Output
↳ Details: This pin outputs the left channel audio signal from the DAC.
★ Pin 30: VCOMO
↳ Function: Common Voltage Output
↳ Details: This pin provides a common voltage output, often used to bias other parts of the audio circuitry.
★ Pin 31: DACVDD
↳ Function: DAC Power Supply
↳ Details: This pin supplies power to the DAC circuitry, ensuring stable and accurate audio output.
★ Pin 32: VCOM
↳ Function: Common Voltage
↳ Details: This pin serves as a reference voltage for the DAC and other analog circuits, crucial for maintaining signal integrity.
▶ Schematic Diagram Explanation
The schematic diagram of the AC6936D typically shows how each pin is connected in a circuit. It provides a visual representation of the IC's connections and their respective roles within the device. Key components connected to the pins include power supplies, ground connections, audio inputs and outputs, Bluetooth RF circuitry, and digital communication interfaces.
▶ Key Components in the Schematic
★ Power Supply Circuits: These circuits provide the necessary voltages to different sections of the IC. The power pins (VBAT, DVDD, BT_AVDD, etc.) are connected to voltage regulators and capacitors to ensure stable power delivery.
★ Ground Connections: All GND pins (AGND, PGND, GND) are connected to the common ground plane of the circuit, ensuring a stable reference point for all signals.
★ Oscillators: The crystal oscillator (connected to BT_OSCI and BT_OSCO) generates the clock signals required for Bluetooth communication.
★ Audio Circuits: The DAC outputs (DACL and DACR) are connected to audio amplifiers and speakers, while the microphone input (MIC) is connected to an external microphone circuit.
★ Bluetooth RF Circuit: The BT_RF pin is connected to an antenna circuit for Bluetooth signal transmission and reception.
★ Digital Communication Interfaces: The I2C (G_SDA and G_SCL) and USB (USBDM and USBDP) pins are connected to external devices for data communication.