Volt Adapter - Segger J-Link User Manual

162
PIN
11 TDO
12 RESET
13 VTref
14 GND
Table 8.10: Mapping between the JTAG 14 pin adapter and 20 pin JTAG interface
8.4.3

5 Volt adapter

The 5V adapter extends the voltage range of J-Link / J-Trace (and other, pin-compat-
ible JTAG probes) to 5V. Most targets have JTAG signals at voltage levels between
1.2V and 3.3V for J-Link and 3.0V up to 3.6V for J-Trace. These targets can be used
with J-Link / J-Trace without a 5V adapter. Higher voltages are common primarily in
the automotive sector.
8.4.3.1 Technical data
• 20 pin connector, female (plugs into J-Link / J-Trace)
• 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
• Maximum JTAG-frequency: 10 MHz
8.4.3.2 Compatibility note
The J-Link 5V adapter is compatible to J-Link revisions 4 or newer and J-Trace. Using
an older revision of J-Link together with a 5V adapter will not output a reset signal to
your target, because older J-Link versions were not able to drive high level on Reset
and TRST to target. To actually determine if your J-Link is compatible to the 5V
adapter, you may check whether J-Link outputs a reset signal (active high) to your
target CPU.
8.4.3.3 Connecting the adapter to J-Link and target
The 5 Volt adapter should be plugged directly into J-Link / J-Trace with the 20-pin
female connector. The target ribbon cable is then attached to the 20-pin male con-
nector of the adapter. The picture below shows a J-Link with a connected 5-Volt
adapter
J-Link / J-Trace (UM08001)
CHAPTER 8
Signal
13
15
1
GND
© 2004-2009 SEGGER Microcontroller GmbH & Co. KG
Target interfaces and adapters
Pin no. on 20 pin JTAG