AT43USB353M-AC ATMEL [ATMEL Corporation], AT43USB353M-AC Datasheet - Page 2

• Manufacturer Part Number: AT43USB353M-AC
• Description: Low Cost USB Microcontroller with Hub, ADC and PWM
• Manufacturer: ATMEL [ATMEL Corporation]

Overview
Development
Support
2
AT43USB353M
The Atmel AT43USB353M is a full-speed USB AVR-based microcontroller with a full-speed
USB 2.0 compliant embedded hub especially suitable for use in applications requiring Analog-
to-Digital converters (ADCs) and PWMs such as in force feedback game controllers. The USB
hub has 3 downstream ports, one of which is permanently attached to the USB function. The
USB function controller has its own device address and endpoints. In game controller applica-
tions, the two external downstream USB ports can be used to connect other devices such as
headphone sets for voice commands flash memory modules or any other USB device.
The MCU of the AT43USB353M is a high performance 8-bit AVR RISC that operates at a
clock frequency of 12 MHz or 24 MHz. Its program memory is a 24-Kbyte mask programmable
ROM and its data memory is 1-Kbyte SRAM. The ADC has a minimum conversion time of
12 ms that together with the 12 input channels should cover even the most demanding game
controllers such as gamepads, joysticks and racing wheels. The two PWM outputs can be pro-
grammed for 8-, 9- or 10-bit resolution for applications requiring force feedback. The 15
general-purpose programmable I/O pins provide generous inputs for the various buttons and
switches and LED indicators that are being used in increasing numbers in today’s game
controllers.
The USB function has one control endpoint and three additional programmable endpoints,
each with their own FIFOs. Two of the endpoints have a 64-byte FIFO each, while the third
has an 8-byte FIFO. The USB hardware supports the physical and link layers of the USB pro-
tocol while the transaction layer function must be implemented in the MCU’s firmware. The
AVR architecture was developed to be efficiently programmed in C and without loss in
performance.
The AT43USB353M is binary-compatible with the AT43USB355. Firmware written for the
AT43USB355 will run on the AT43USB353M without modification as long as only features
common to both devices are used.
The AT43USB353M uses the same program and development tools as the AT43USB355 and
other Atmel AVR microcontrollers including: C compilers, macro assemblers, program debug-
gers/simulators, in-circuit emulators. The development kit is the AT43DK355, which comes
with USB firmware library and sample source code for the most common USB applications.
3307AS–USB–02/03