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Microchip Technology AT43USB355E-AU
- Part No.:
- AT43USB355E-AU
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
AT43USB355E-AU.pdf
- Description:
- IC USB MCU W/HUB,ADC,PWM 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,278
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Product details
Overview
AT43USB355E-AU from Microchip Technology (formerly Atmel) is a full-speed USB 1.1–compliant AVR microcontroller with integrated USB hub controller, 12-channel 10-bit ADC, dual PWM outputs, and 27 programmable I/O pins. It operates at 5 V with on-chip 3.3 V regulation, features 24 KB program memory (downloadable SRAM), 1 KB internal SRAM, and is packaged in 64-lead LQFP. It targets game controller systems requiring force feedback, analog sensing, and multi-peripheral USB expansion.
For engineers reviewing the AT43USB355E-AU datasheet, AT43USB355E-AU pinout, AT43USB355E-AU application, or AT43USB355E-AU equivalent, key selection criteria include its embedded USB hub topology (2 external + 1 attached downstream ports), firmware-loadable SRAM configuration, 12 µs ADC conversion time, and support for C-based firmware development using standard AVR toolchains.
Technical Context
The AT43USB355E-AU integrates a full-speed USB transceiver, serial interface engine (SIE), hub repeater, and endpoint controllers - all interfaced to an AVR RISC core. Its USB hub supports three downstream ports (DP0/DM0, DP2/DM2, DP3/DM3), with one port permanently attached to the internal USB function controller that holds its own device address and four endpoints.
Firmware implements the USB transaction layer and hub controller logic; the hub can be disabled if not required. The microcontroller includes two timer/counters (one 8-bit, one 16-bit with dual PWM), a 12-channel 10-bit ADC (min. 12 µs conversion), and programmable SPI - enabling real-time analog input sampling, motor control, and peripheral communication in compact USB-attached devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| USB Standard | USB 1.1 Full Speed (12 Mbps); hardware-level PHY and SIE implemented, transaction/hub logic in firmware |
| Downstream Ports | 3 total: 2 external (DP2/DM2, DP3/DM3), 1 internal (DP0/DM0) permanently connected to USB function |
| ADC Resolution & Speed | 12-channel 10-bit ADC; minimum 12 µs conversion time per sample - sufficient for real-time button/joystick analog scanning |
| PWM Outputs | Two independent PWM channels; configurable for 8-/9-/10-bit resolution - enables precise force-feedback motor control |
| Memory | 24 KB downloadable SRAM program memory; 1 KB internal SRAM; 32 × 8 general-purpose registers |
| Operating Voltage | 5 V supply with integrated 3.3 V regulators for USB PHY and core logic - eliminates need for external LDOs |
| Clock Source | 6 MHz crystal oscillator with PLL; generates internal 48 MHz USB clock and CPU timing |
Pinout & Package
64-lead LQFP (Low-profile Quad Flat Package), 10 mm × 10 mm body, 0.5 mm pitch, 1.4 mm max height (JEDEC MS-026 ACB compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PA[0:7], PB[0:7], PD[0:7], PF[1:3] | General-purpose I/O ports | 27 programmable bidirectional pins for buttons, LEDs, switches, and peripheral control |
| ANI[0:11] | Analog input channels | 12 dedicated ADC inputs - supports simultaneous analog sensing across gamepad axes, triggers, and sensors |
| DP0/DM0, DP2/DM2, DP3/DM3 | USB differential data pairs | Three full-speed USB downstream ports: one internal (to embedded function), two external for peripherals |
| XTAL1/XTAL2 | Crystal oscillator connections | Supports 6 MHz crystal for PLL-based 48 MHz USB clock generation |
| RSTN | Active-low reset input | Asynchronous reset signal; compatible with standard USB hub reset sequencing |
| TEST | Factory test mode enable | Used during production testing; must be pulled low or high per datasheet for normal operation |
| VCCA/VSSA, VCC[1:3]/VSS[1:3] | Power and ground terminals | Separate analog/digital power domains; multiple VCC/VSS pins reduce noise and improve ADC accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Embedded USB 1.1 Hub | Enables daisy-chained USB peripherals without host-side hub hardware - reduces system BOM and latency |
| Firmware-Loadable SRAM | Allows field-upgradable USB hub and function behavior via external serial Flash/EEPROM - no mask ROM re-spin needed |
| Dual PWM with Configurable Resolution | Supports 8-/9-/10-bit PWM for fine-grained force-feedback actuator control - matches mechanical response requirements of racing wheels and joysticks |
| 12-Channel 10-bit ADC | Provides simultaneous analog acquisition from potentiometers, pressure sensors, and accelerometers - meets gaming HMI sampling demands |
| AVR RISC Architecture | Optimized for efficient C compilation and deterministic real-time execution - simplifies USB stack and HID report handling |
Applications
| Game Controller Hub | USB Peripheral Aggregator |
|---|---|
Use Scenario: Gamepad with analog sticks, triggers, and vibration motors connects to PC while hosting USB headphones and flash storage. IC Role / Device Role / Timing Role: AT43USB355E-AU acts as USB hub controller and HID device, managing upstream traffic and local analog/PWM peripherals. Use Value: Eliminates need for separate hub IC and MCU; single-chip solution reduces PCB area and firmware integration effort. | Use Scenario: Industrial USB accessory dock supporting barcode scanner, magnetic stripe reader, and LED status display. IC Role / Device Role / Timing Role: AT43USB355E-AU serves as USB function + hub controller, routing host commands and aggregating sensor data. Use Value: Enables plug-and-play peripheral expansion with local processing - no host driver modification required. |
| Racing Wheel Interface | Programmable HID Device |
Use Scenario: High-fidelity racing wheel with torque feedback, pedal analog sensing, and rotary encoders. IC Role / Device Role / Timing Role: AT43USB355E-AU provides real-time ADC sampling (12 µs), dual PWM for motor control, and USB HID reporting. Use Value: Sub-12 µs analog loop and 10-bit PWM resolution meet strict force-feedback timing and fidelity specs. | Use Scenario: Custom USB HID device (e.g., macro keypad) with user-configurable button mapping and RGB lighting. IC Role / Device Role / Timing Role: AT43USB355E-AU functions as programmable USB HID device with local SRAM-based firmware updates. Use Value: Field-upgradable behavior via external Flash allows post-deployment feature enhancements without hardware change. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB microcontroller with embedded hub applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT43USB355M-AU | Masked ROM program memory (not field-upgradable); otherwise pin- and function-compatible | Suitable for high-volume, fixed-function deployments where firmware never changes | Select AT43USB355M-AU when firmware stability and lower unit cost outweigh field upgrade flexibility |
| USB2514B-AEZG | Dedicated USB 2.0 hub IC (no MCU, no ADC, no PWM); requires external microcontroller for custom logic | Used in pure hub applications needing higher bandwidth (480 Mbps) but no local analog/PWM processing | Select USB2514B-AEZG only when USB 2.0 speed and minimal BOM cost are primary - no local intelligence required |
Compared with AT43USB355M-AU, the AT43USB355E-AU offers field-upgradable firmware at the cost of external Flash dependency; compared with USB2514B-AEZG, it trades USB 2.0 speed for integrated MCU, ADC, and PWM - enabling self-contained USB peripheral systems without external host-side logic.
Availability
AT43USB355E-AU is available at Aetrix Electronics and suitable for game controller design, industrial USB accessory docks, racing wheel interfaces, and programmable HID devices requiring stable component supply and long-term manufacturability.
Supply support for AT43USB355E-AU includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology acquired Atmel in 2016 and continues to support legacy AVR microcontrollers including the AT43USB355 family.
The AT43USB355 product line was designed specifically for USB-attached human interface devices requiring integrated hub functionality, analog sensing, and local motor control - targeting gaming, simulation, and industrial HMI markets.
FAQ
What is the program memory architecture of the AT43USB355E-AU?
The AT43USB355E-AU uses 24 KB of downloadable SRAM for program memory, loaded automatically from an external serial Flash or EEPROM during power-on reset. This differs from the masked ROM version (AT43USB355M-AU) and enables field firmware updates. The AT43USB355E-AU retains 1 KB of internal SRAM for runtime variables and stack operations, fully supporting C-based development workflows used across the AVR ecosystem.
Does the AT43USB355E-AU support USB 2.0 High-Speed operation?
No, the AT43USB355E-AU implements only USB 1.1 Full Speed (12 Mbps) compliance. Its USB hardware block includes a full-speed transceiver and serial interface engine (SIE), but lacks the PHY and link-layer logic required for 480 Mbps High-Speed operation. Applications requiring USB 2.0 must use alternative hub ICs such as the USB2514B-AEZG, though those lack the integrated MCU, ADC, and PWM capabilities of the AT43USB355E-AU.
How many USB downstream ports does the AT43USB355E-AU provide, and how are they configured?
The AT43USB355E-AU provides three USB downstream ports: DP0/DM0 (internally connected to the embedded USB function), and DP2/DM2 and DP3/DM3 (externally accessible). The hub logic resides in firmware, allowing selective enable/disable of individual ports. All ports operate at Full Speed, and the internal port enables the device to present itself as both a USB hub and a composite HID device simultaneously - a key capability leveraged in game controller designs.
Can the AT43USB355E-AU's ADC be used concurrently with USB communication?
Yes, the AT43USB355E-AU's 12-channel 10-bit ADC operates independently of USB traffic. With a minimum conversion time of 12 µs and dedicated ANI[0:11] pins, it supports continuous analog sampling during active USB enumeration and data transfer. This concurrency is essential for real-time game controller input processing - for example, reading analog stick position while transmitting HID reports - and is enabled by the AVR's interrupt-driven architecture and separate clock domains for ADC and USB subsystems.
Is the AT43USB355E-AU pin-compatible with other members of the AT43USB355 family?
Yes, the AT43USB355E-AU is pin- and function-compatible with the AT43USB355M-AU. Both share identical 64-lead LQFP packaging, identical pin assignments (including PA–PF, ANI, DP/DM, XTAL, RSTN), and identical electrical specifications. The sole functional difference lies in program memory type: SRAM (E-version) vs. masked ROM (M-version). This compatibility allows seamless migration between versions during design-in or production ramp without PCB revision.
AT43USB355E-AU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- AVR®
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Applications:
- USB Microcontroller
- Core Processor:
- AVR
- Program Memory Type:
- SRAM (24kB)
- Controller Series:
- AT43USB
- RAM Size:
- 1K x 8
- Interface:
- SPI, 3-Wire Serial
- Number of I/O:
- 27
- Voltage - Supply:
- 4.4V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-LQFP (10x10)
AT43USB355E-AU FAQ
1.How can I place an order for AT43USB355E-AU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT43USB355E-AU on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT43USB355E-AU reliable?
The price and inventory of AT43USB355E-AU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT43USB355E-AU is usually 5 days.
3.What payment methods are accepted for AT43USB355E-AU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT43USB355E-AU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT43USB355E-AU?
AT43USB355E-AU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT43USB355E-AU order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT43USB355E-AU?
For technical support, including AT43USB355E-AU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT43USB355E-AU requirements.
6.How does Aetrix verify that AT43USB355E-AU is sourced from the original manufacturer or authorized distributors?
All AT43USB355E-AU products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT43USB355E-AU meets industry standards.
7.What is the process for return or replacement of AT43USB355E-AU?
All AT43USB355E-AU units undergo pre-shipment inspection (PSI). If there is an issue with AT43USB355E-AU, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT43USB355E-AU part is unused and in its original packaging.
Return procedure for AT43USB355E-AU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT43USB355E-AU Tags
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CYPD3175-24LQXQ
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AT97SC3204-U2A1A-20
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AT97SC3204-U2A1A-10
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SLM9670AQ20FW1311XTMA1
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SLB9672XU20FW1613XTMA1
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SLB9672AU20FW1613XTMA1
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SLB9673AU20FW2613XTMA1
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