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.

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

Item no. 8.08.02 / J-Link 5V Adapter

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.

JTAG 14 pin Adapter

An adapter is available to use J-Link ARM with targets using this 14 pin 0.1" mating JTAG connector.

Pin	Signal	Pin no. on 20 pin JTAG
1	VTref	1
2	GND	GND
3	nTRST	3
4	GND	GND
5	TDI	5
6	GND	GND
7	TMS	7
8	GND	GND
9	TCK	9
10	GND	GND
11	TDO	13
12	RESET	15
13	VTref	1
14	GND	GND

Item no. 8.08.01 / J-Link ARM-14

JTAG Isolator

The J-Link JTAG Isolator can be connected between J-Link ARM and any ARM-board that uses the standard 20-pin JTAG-ARM connector to provide a galvanic isolation between J-Link and the target. This is essential when the development tools are not connected to the same ground as the application. It is also useful to protect the development tools from electrical spikes that often occur in some applications, such as motor control applications. A 20-pin flat cable (supplied with J-Link) is needed to connect the target.

Technical data:

1kV DC isolation
3.3V and 5V target operation supported
Powered from emulator and target
JTAG standard 20-pin connection supporting TRST, TDI, TMS, TCK, RTCK, TDO and RESET signals
Power consumption on target side: < 50mA
JTAG frequency: Up to 4MHz
3 LEDs to indicate emulator power, target power and target RESET

J-Link JTAG Isolator