J-Link 5V Adapter

The 5V adapter extends the voltage range of J-Link ARM (and other, pin-compatible JTAG probes) to 5V. Most targets have JTAG signals at voltage levels between 1.2V and 3.3V. These targets can be used with J-Link ARM without a 5V adapter. Higher voltages are common primarily in the automotive sector.

NOTE: Since J-Link hardware revision 5.4 the 5V adapter is obsolete because 5V target interfaces are supported by J-Link.

Technical data: 20 pin connector, female (plugs into J-Link) 20 pin connector male, for target ribbon cable LED shows power status Adapter is powered by target Power consumption < 20 mA Target supply voltage: 3.3V - 5V Max. JTAG-frequency: 10 MHz Pricing

Compatibility note

The J-Link ARM 5V adapter is compatible to J-Link ARM revisions 4 or newer. Using an older revision of J-Link ARM together with a 5V adapter will not output a reset signal to your target, because older J-Link ARM versions were not able to drive high level on Reset and TRST to target. To actually determine if your J-Link ARM is compatible to the 5V adapter, you may check whether J-Link ARM outputs a reset signal (active high) to your target CPU.

Usage

The 5 volt adapter should be plugged directly into J-Link ARM with the 20 pin female connector. The target ribbon cable is then attached to the 20 pin male connector of the adapter. The picture below shows a J-Link ARM with a connected 5 volt adapter.