ATMEGA32U4-MU Atmel, ATMEGA32U4-MU Datasheet - Page 7

• Manufacturer Part Number: ATMEGA32U4-MU
• Description: MCU AVR 32K FLASH 16MHZ 44-QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA32U4-MU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 26
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2.5K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-VQFN
• Package: 44QFN EP
• Device Core: AVR
• Family Name: ATmega
• Maximum Speed: 16 MHz
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 26
• Interface Type: EBI/I2S/SPI/TWI/USART/USB
• On-chip Adc: 12-chx10-bit
• Number Of Timers: 5
• For Use With: ATSTK524 - KIT STARTER ATMEGA32M1/MEGA32C1ATSTK600 - DEV KIT FOR AVR/AVR32ATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVRATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ATMEGA32U4-16MU; ATMEGA32U4-16MU

6.4
7. PC Software
8. Limitations
9. Related Documents
7820A–AVR–11/08
Input Terminal N°1
Input Terminal N°4
USB stream
Microphone
usb_descriptor.c
1 channel
1 channel
The audio topology, which is put in USB descriptor, is explained in the AUDIO specification
(http://www.usb.org/developers/devclass_docs/audio10.pdf). The audio topology chose for this
demo is described in the following figure.
Figure 6-3.
The USB audio application does not require any PC software. Under Windows
standard recorder “Sound Recorder” to try the microphone feature.
If the speaker is running at 32KHz then recording and playback can’t be running at same time,
due to linited CPU bandwidth when clocked at 8MHz.
AVR USB Datasheet (doc 7766)
USB Software Library for AT90USBxxx Microcontrollers (doc 7675)
USB Audio class specification (www.usb.org)
Audio Function Topology from demo
Control volume and mute
Control volume and mute
Feature Unit N°2
Feature Unit N°5
Ouput Terminal N°3
Ouput Terminal N°6
USB stream
®
Speaker
, you can use the
AVR298
7