- Google Edge TPU ML accelerator coprocessor
- USB 3.0 (USB 3.1 Gen 1) Type-C socket
- Supports Debian Linux on host CPU
The Coral USB Accelerator adds an Edge TPU coprocessor to your system. It includes a USB socket you can connect to any Linux-based system to perform accelerated ML inferencing.
The on-board Edge TPU is a small ASIC designed by Google that provides high performance ML inferencing with a low power cost. For example, it can execute state-of-the-art mobile vision models such as MobileNet v2 at almost 400 FPS, in a power-efficient manner.
Table of contents
- System requirements
- Components overview
- Product dimensions
- Software and operation
- Power specifications
- Performance settings
- Recommended operating conditions
- Environmental and electrical reliability tests
- Mechanical reliability tests
- Document revisions
A host computer connected to the Coral USB Accelerator must conform to the following specifications:
- Debian 6.0 Linux distribution or higher, or any derivative thereof (such as Ubuntu 10.0+)
- x86-64 or ARM64 system architecture
- One available USB port
The Coral USB Accelerator is a small PCB that provides an Edge TPU coprocessor for your host CPU system.
USB cable length: 300 mm ± 20 mm
Software and operation
The USB Accelerator does not require any software to be installed, but the host computer must have the Edge TPU runtime and API library. Instructions on how to install these are included in the guide for how to get started with the USB Accelerator.
For information about how to create models and run inferences on the Edge TPU, read the documentation for TensorFlow models on the Edge TPU.
When you first set up the USB Accelerator, you can select whether the device operates at the default clock frequency or the maximum clock frequency. The maximum clock frequency is twice the default setting, which increases the inferencing speed but also increases power consumption.
To change the clock frequency at which the device operates, simply install the alternate runtime, as described in the instructions for how to install the Edge TPU runtime.
The USB Accelerator includes an LED that indicates the current system state. The following table describes the behavior of the LED.
|System state||LED behavior|
|Edge TPU initialized||On (solid)|
|Edge TPU running||Pulse (breathe)|
The USB Accelerator is powered by 5 V from the USB interface through on-board power management chip (PMIC).
The device should be connected to a host computer with a USB cable that provides at least 500 mA at 5 V. Please note that when the device runs at maximum speed, it can draw a peak current of 900 mA.
Recommended operating conditions
Depending on the computation workloads and operating frequency, the USB Accelerator may heat up during normal operation. Contact with the metal part of the device may lead to discomfort and/or skin burns if the device has been operating for an extended period. We recommend the following operating temperature ranges, depending on the operating frequency you have selected.
|Operating frequency||Maximum ambient temperature|
Google does not accept any responsibility for loss or damage if the device is handled unsafely or operated outside of the recommended ambient temperature range.
Environmental and electrical reliability tests
|Heat soak||Non-op: 60°C/90% RH||72 hrs|
|Temp cycling||Non-op: -20°C/60°C||300 cycles|
|Short term survivability||Non-op: 85°C/20% RH, 18 hrs||18 hours|
|Long-term operational stress (LTOS)||Op: 40°C/90% RH||1000 hours|
|ESD - Air discharge||15~35°C, 30~60% RH||12 kV|
|ESD - Contact discharge||15~35°C, 30~60% RH||8 kV|
Mechanical reliability tests
|0.5 m controlled drop on wood||6 faces, 12 edges, 3/4" wood||18 drops|
|0.5 m tumble||Impact surface: steel plate > 3 mm thick||50 drops|
|Repetitive drop||75 mm drop on plywood, six faces||50 drops|
|Vibration||3 axes (X, Y and Z), 15 minutes per axis, 10-500 Hz. Amplitude: 2.16 Grms||45 minutes|
|USB-C connector cycling||Manual plug/ unplug||1000 cycles|
|USB-C connector side load 2.5 kg||2.5 kgf load, 15 mm from the plug, 2 orientations||50 cycles|
|Pressure & squeeze - 50 kg||50 kgf, 100 mm rubber pad||10 cycles|
|Pressure & squeeze - 5 kg||5 kgf, 10 mm rubber pad||10 cycles|
|USB cable 120° bend||60° CW + 60° CCW, 453 gf tension, 42 rpm||100 cycles|
|Coral-USB-Accelerator.STEP||3D CAD file in STEP format|
|1.1 (October 2019)||Clarified power requirements|
|1.0 (September 2019)||Updated information about performance settings|
|Beta (March 2019)||Initial release|
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