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Test Farm Power Adapter

The adapter permits remote control of the power supply of a test device, enabling both power savings and the use of automated reboot for the testing process.

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Documentation
SEGGER Debug & Trace Probes
  1. 1.Overview
  2. 2.What is a test farm?
    1. 2.1.The benefits of a test farm and how to build one
  3. 3.Use Cases
    1. 3.1.Communication tests
    2. 3.2.Compatibility tests
  4. 4.Hardware specifications
    1. 4.1.Pins and connection
    2. 4.2.Power source and delivery
  5. 5.Package content

Overview

The Test Farm Power Adapter enables power that is supplied to a target through a USB connector to be switched on and off remotely using J-Link software. Since the debug signals are maintained, it can be used along with Ethernet featured debug probes like the J-Link PRO to build test farms.

Test farm setup using J-Links with farm adapter

What is a test farm?

In terms of embedded systems, a test farm (or “board farm” or “device farm”) consists of a number of nodes (such as evaluation boards, prototype boards, production boards, finished products, etc.) connected to a network via debug probes, making them remotely accessible to testers or developers.

It is a very efficient way to share access to hardware that is in limited supply among a number of users. Additionally, automated build systems can run tests on the same standard setup, which is ideal for regression testing, continuous integration, compiler tests, and more.

The benefits of a test farm and how to build one

Find out more about test farms, including how to build a J-Link test farm with the J-Link Test Farm Power Adapter, on our Test Farm wiki page.

Use Cases

There are a lot of use cases for almost any test setup for an embedded system. As soon as the number of devices to be tested grows, a test farm is inevitably required to ensure quality. A test farm with J-Links and the J-Link Test Farm Power Adapter may consist of multiple test devices of the same type or be completely different. We have described a couple of test cases below.

Communication tests

Communication reliability can only be tested with massive test setups that generates a huge amount of traffic on the communication channel. Specifically, wireless traffic, using protocols such as WiFi, ZigBee or Matter, is prone to interference and requires thorough testing in order to ensure operation even under bad conditions. Communication test setups therefore use heterogeneous targets to ensure interoperability with different devices as well as a huge number of similar devices to prove reliability.

Compatibility tests

Testing compatibility of an updated firmware module running on different platforms or of a compiler requires a setup using different devices. A test farm shortens test time by addressing the tests in parallel on multiple different targets and ensures, that any changes to the compiler or firmware module are tested thoroughly against all possible target devices.

Hardware specifications

Pins and connection

The Test Farm Power Adapter has a standard 20-pin 0.1" socket towards the J-Link and a standard 20-pin 0.1" header on the target side. It can directly be inserted between the J-Link and the debug cable maintaining a 1:1 connection of all debug signals except pin 19 which carries the target supply.

The adapter also has 2 USB connectors.

Power source and delivery

Power is delivered to the target through a USB-A host connector (USB2.0, power-only). The power source can be either the J-Link debug probe or an USB power source like a hub or wall adapter. In the first case the output voltage coming from J-Link is boosted to 5 V and is limited to around 250 mA. If the Micro USB connector of the Test Farm Power Adapter is used together with an external supply currents of 1 A and more are possible.
 

Farm adapter block diagram
Farm adapter block diagram

Package content

Test Farm Power Adapter
Farm adapter

Headquarters

SEGGER Microcontroller GmbH

Ecolab-Allee 5
40789 Monheim am Rhein, Germany
info@segger.com
Tel.: +49-2173-99312-0
Fax: +49-2173-99312-28

Locations

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Gardner, MA 01440, USA
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Silicon Valley
Milpitas, CA 95035, USA
us-west@segger.com
Tel.: +1-408-767-4068

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Room 218, Block A, Dahongqiaoguoji
No. 133 Xiulian Road
Minhang District, Shanghai 201199, China
china@segger.com
Tel.: +86-133-619-907-60

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