IAR SYSTEMS I-jet - Working with I-scope; Technical Specifications

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Working with I-scope

IAR Debug Probes User Guide

I-jet®, I-jet Trace, and I-scope™

the MCU goes into the high-current mode. For information about the minimum value

for your specific processor, see its data sheet.

To convert the current measurements to the actual power consumed by the MCU,

I-scope automatically measures voltage at the I- terminal of the shunt resistor.

I-scope measures current and voltages at a sampling rate of up to 200 kHz and sends it

to I-jet/I-jet Trace which synchronizes it with the running MCU's program counter (if

available), so it can be displayed in real time and analyzed using C-SPY.

For more information about power debugging using C-SPY, see the C-SPY Debugging

Guide for Arm.

Working with I-scope

SETUP AND INSTALLATION

Connect I-scope to I-jet/I-jet Trace using the supplied MIPI-20 cable.

2 Connect the target to I-scope using the MIPI-20 cable that came with I-jet/I-jet Trace.

3 Start IAR Embedded Workbench and select your project.

4 To measure current, connect the I+ and I- leads across the shunt resistor on your board.

The I+ lead should be connected on the higher voltage side, which is the one coming

from the voltage regulator or power supply. If the leads are reversed, the Power graph

in the Timeline window will show current and power equal to 0.

To measure voltage, connect one or more of the I+, V1, V2, and V3 scope channels to

any voltage test points that you want to monitor.

5 From the C-SPY driver menu in IAR Embedded Workbench, choose Power Log

Setup and enter the shunt resistor value in the Power Log Setup window.

6 Start the application. To enable power logging, choose Enable from the context menu

in the Power Log window or from the context menu in the Power Log Graph in the

Timeline window. The power and voltage data shown in the Power graph in the

Timeline window will be displayed in real time while the MCU program is running.

Technical specifications

Reference information about:

● The I-scope package, page 61

● External characteristics, page 61

● I-scope probe specification, page 62