IAR Debug probes User
Guide
I-jet®, I-jet Trace, and I-scope™
for Advanced RISC Machines Ltd’s
ARM® Cores
IARprobes-6
COPYRIGHT NOTICE
© 2012-2017 IAR Systems AB.
No part of this document may be reproduced without the prior written consent of IAR
Systems AB. The software described in this document is furnished under a license and
may only be used or copied in accordance with the terms of such a license.
DISCLAIMER
The information in this document is subject to change without notice and does not
represent a commitment on any part of IAR Systems. While the information contained
herein is assumed to be accurate, IAR Systems assumes no responsibility for any errors
or omissions.
In no event shall IAR Systems, its employees, its contractors, or the authors of this
document be liable for special, direct, indirect, or consequential damage, losses, costs,
charges, claims, demands, claim for lost profits, fees, or expenses of any nature or kind.
TRADEMARKS
IAR Systems, IAR Embedded Workbench, IAR Connect, C-SPY, C-RUN, C-STAT,
visualSTATE, IAR KickStart Kit, IAR Experiment!, I-jet, I-jet Trace, I-scope, IAR
Academy, IAR, and the logotype of IAR Systems are trademarks or registered
trademarks owned by IAR Systems AB.
Microsoft and Windows are registered trademarks of Microsoft Corporation.
ARM and Thumb are registered trademarks of Advanced RISC Machines Ltd.
EmbeddedICE is a trademark of Advanced RISC Machines Ltd. uC/OS-II and
uC/OS-III are trademarks of Micrium, Inc. CMX-RTX is a trademark of CMX Systems,
Inc. ThreadX is a trademark of Express Logic. RTXC is a trademark of Quadros
Systems. Fusion is a trademark of Unicoi Systems.
Adobe and Acrobat Reader are registered trademarks of Adobe Systems Incorporated.
All other product names are trademarks or registered trademarks of their respective
owners.
EDITION NOTICE
Sixth edition: March 2017
Part number: IARprobes-6
Internal reference: IMAE.
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Contents
I-jet
............................................................................................................................. 5
Introduction ................................................................................................ 5
The I-jet in-circuit debugging probe .................................................... 5
Requirements ....................................................................................... 7
Supported ARM core families ............................................................. 7
Target connections ............................................................................... 7
Working with I-jet .................................................................................... 7
Setup and installation ........................................................................... 8
Connecting the target system ............................................................... 8
Updating the probe firmware ............................................................... 9
Technical specifications ....................................................................... 13
The I-jet package ................................................................................ 13
Model specifications .......................................................................... 13
JTAG timing specification ................................................................. 15
Hardware revision history .................................................................. 16
Target interface .................................................................................. 17
Indicators ............................................................................................ 20
Adapters ............................................................................................. 21
I-jet Trace
............................................................................................................. 35
Introduction .............................................................................................. 35
The I-jet Trace CM and I-jet Trace A/R/M in-circuit debugging probes
35
Requirements ..................................................................................... 36
Target connections ............................................................................. 37
Working with I-jet Trace .................................................................... 37
Setup and installation ......................................................................... 38
Connecting the target system ............................................................. 38
Using trace ......................................................................................... 39
Updating the probe firmware ............................................................. 39
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Technical specifications ....................................................................... 40
The I-jet Trace package ...................................................................... 40
Model specifications .......................................................................... 40
Hardware revision history .................................................................. 42
Connectors ......................................................................................... 43
Indicators ............................................................................................ 45
Adapters ............................................................................................. 47
Designing target boards for ETM trace .............................................. 51
General PCB layout guidelines .......................................................... 51
I-scope
.................................................................................................................... 55
Introduction .............................................................................................. 55
Reasons for using I-scope .................................................................. 55
The I-scope probe ............................................................................... 55
Current and voltage measurement using I-scope ............................... 55
Working with I-scope ........................................................................... 57
Installation .......................................................................................... 58
Technical specifications ....................................................................... 58
The I-scope package ........................................................................... 58
External characteristics ...................................................................... 59
I-scope probe specification ................................................................ 60
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I-jet
●
Introduction
●
Working with I-jet
●
Technical specifications
Introduction
These topics are covered:
●
The I-jet in-circuit debugging probe
●
Requirements
●
Supported ARM core families
●
Target connections.
THE I-JET IN-CIRCUIT DEBUGGING PROBE
The I-jet in-circuit debugging probe has full support for on-chip trace: ETB, MTB, and
TMC (Trace Memory Controller).
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Introduction
I-jet connects to the target board via a JTAG, SWD, or cJTAG connection, and to the
host computer via the USB port.
C-SPY debugger
C-SPY driver
USB connection
I-jet
JTAG/SWD
I-jet communicates using USB 2.0. USB 1.0 is also supported but not advised. The I-jet
in-circuit debugging probe is also referred to as a debug probe, debug adapter, or JTAG
in-circuit emulator by different tool vendors.
I-jet streams the program counter, variables, and power measurement data to the host
computer to provide a view into program execution in real time. Besides the typical
JTAG debugging, I-jet is capable of providing power to the target board and measuring
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I-jet
it with sufficient accuracy to provide a power profile during program execution in real
time. This feature is referred to as power debugging.
For debugging Cortex devices, I-jet also supports the SWO (Serial Wire Output) feature,
which can be used for tracing the program execution and tracking variables at predefined
points in your code.
The I-jet in-circuit debugging probe has full support for on-chip trace: ETB, MTB, and
TMC (Trace Memory Controller).
REQUIREMENTS
I-jet needs to be controlled by the IAR C-SPY® Debugger which comes with the IAR
Embedded Workbench® IDE.
SUPPORTED ARM CORE FAMILIES
These cores are currently supported:
●
ARM7
●
ARM9
●
ARM11
●
Cortex-M
●
Cortex-R
●
Cortex-A.
TARGET CONNECTIONS
These interfaces are supported:
●
MIPI-20 (part number SHF-110-01-L-D): JTAG, cJTAG, SWD, SWO, ETM
●
MIPI-10 (part number SHF-105-01-L-D): JTAG, cJTAG, SWD, SWO
●
ARM-20 (part number HTST-110-01-L-DV): JTAG, cJTAG, SWD, SWO
I-jet comes with a MIPI-20 connector on the front panel and with MIPI-20 and MIPI-10
cables, as well as a legacy ARM-20 adapter.
All other available I-jet adapters are also compatible with I-jet Trace.
Working with I-jet
These tasks are covered:
●
Setup and installation
●
Connecting the target system.
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Working with I-jet
●
Updating the probe firmware
For information about debugging using I-jet, see the C-SPY® Debugging Guide for
ARM.
SETUP AND INSTALLATION
Software
Before you can use I-jet, you need to install IAR Embedded Workbench for ARM.
Probe setup
I-jet does not require any special driver software installation. Normally, all drivers for
I-jet are automatically installed as part of the installation of IAR Embedded Workbench.
If you need to install the USB driver manually, navigate to
\Program Files\IAR Systems\Embedded Workbench x.x\arm\drivers\jet
\USB\32-bit or 64-bit (depending on your system). Start the dpinst.exe
application. This will install the USB driver.
For information about using multiple I-jet probes on the same host computer, see the
C-SPY® Debugging Guide for ARM.
CONNECTING THE TARGET SYSTEM
Power-up your I-jet probe
1 Connect I-jet to the host computer using the USB micro cable.
2 Connect I-jet to the target board using the cable that matches the target board connector
(MIPI-20 or MIPI-10). If a standard JTAG connector is used, you must first plug the
ARM-20 to MIPI-20 adapter into the JTAG connector.
Note: No harm is done if the above order is reversed.
To prevent damage, the target GND and the USB host GND must be at the same level.
When hot-plugging, make sure that the PC and the target board power supply are
connected to the same grounded wall outlet or a common grounded desktop power strip.
Power up your evaluation board
If you have an evaluation board that is prepared for it, you can power the board via I-jet
through pin 19 on the standard ARM-20 connector, or pin 11/13 on the small MIPI-20
connector. Target power of up to 420 mA can be supplied from I-jet with overload
protection. Most of the IAR Systems KickStart Kits contain an evaluation board that can
be powered this way. Make sure that the power jumper found on most of these boards
matches your setup.
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I-jet
Note: The target board will get power via I-Jet once you choose the Download and
Debug or Debug without Downloading command, but not before.
Note: The only way to use the power debugging feature is to power up your evaluation
board via I-jet.
UPDATING THE PROBE FIRMWARE
I-jet and I-jet Trace are designed so that firmware updates are not necessary unless new
features added to IAR Embedded Workbench for ARM require extra hardware support.
When a new version of IAR Embedded Workbench for ARM is released and a new
feature that requires new firmware is used, C-SPY displays a message in the Debug Log
window asking you to update the firmware.
Note: Support for new MCU devices is managed totally by software updates in IAR
Embedded Workbench for ARM and has nothing to do with I-jet or I-jet Trace firmware.
For more information about firmware versions, see the release notes.
To update the probe firmware:
1 In IAR Embedded Workbench, choose I-jet/JTAGjet>EmuDiag to display the About
to Connect to an Emulator dialog box.
Select Connect to an Emulator Automatically and click Next.
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Working with I-jet
2 In the EmuDiag dialog box that is displayed, click the Update Firmware button.
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I-jet
3 In the dialog box that is displayed, browse to the arm\bin\jet\firmware\i-jet
folder of your IAR Embedded Workbench installation. In one of the subfolders, select
the firmware file that you want to use and click Open.
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Working with I-jet
4 The update log information is printed in the EmuDiag dialog box.
5 When the firmware update is complete, a message is displayed.
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I-jet
Technical specifications
Reference information about:
●
The I-jet package, page 13
●
Model specifications, page 13
●
JTAG timing specification, page 15
●
Hardware revision history, page 16
●
Target interface, page 17
●
The JTAG/SWD - MIPI-20 cable, page 17
●
The JTAG/SWD - MIPI-10 cable, page 19
●
Indicators, page 20
●
Adapters, page 21.
THE I-JET PACKAGE
The I-jet package contains:
●
The I-jet in-circuit debugging probe
●
MIPI-20 JTAG cable
●
MIPI-10 JTAG cable
●
USB 2.0 Micro B cable
●
MIPI-20 to ARM-20 adapter
●
Welcome letter.
MODEL SPECIFICATIONS
These are the specifications of I-jet:
USB speed
480 Mbps (USB 2.0)
USB connection
Micro-B
Target connection
MIPI-20, MIPI-10
Adapters included
MIPI-20 to ARM-20
I-jet debug interface
JTAG and SWD
JTAG/SWD maximum clock
32 MHz
SWO protocols supported
Manchester and UART
SWO maximum speed
60 Mbps
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Technical specifications
Power supplied to target
420 mA max at 4.4 V-5 V
Over-current protection
~520 mA
Target power measurement resolution
~160 uA
Target power measurement speed
up to 200 ksps (kilo samples per second)
JTAG voltage range (auto-sensing)
1.65 V to 5.5 V
JTAG VTref measurement resolution
~2 mV
Current draw from VTref
< 50 uA
JTAG clock rise/fall time (TCK)
Debugger>I-jet/JTAGjet>Setup page.
●
The adapter does not supply power to target and therefore does not resume the target
power consumption.
●
When used with the TI14 and CTI20 adapters, the EMU0 and EMU1 signals are not
connected.
●
Due to added JTAG signals propagation delays, some target boards might not work
at the full 32 MHz JTAG clock speed, so reducing the JTAG speed in C-SPY might
be needed.
●
The majority of target boards have the SWO signal routed to pin 6 of the target
MIPI20 debug connector. In cases when pin 14 is used for SWO, you must move the
0R shunt (marked S1) up from position 3-2 to position 2-1.
●
The adapter does not support 1.8 V JTAG signals from target. The target JTAG
voltage range is limited to 2.5-5 V.
●
The JTAG interface on the target side automatically adapts to the voltage given on
the target VTREF pin (2.5 V-5 V). Because of the isolation barrier, the I-jet side
uses its own voltage, independent of the target voltage. This is for information only
and has no effect on the target JTAG operation.
●
ETM trace is not supported by this adapter.
●
This adapter cannot be used with I-scope.
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Technical specifications
MIPI20 connector pinout on target side
For more information about the signal descriptions, see The JTAG/SWD - MIPI-20
cable, page 17.
Important safety and disclaimer note
The continuous normal operation voltage across the isolation barrier should not exceed
300 V DC.
The isolation voltage only represents a measure of immunity to transient voltages—the
probe should never be used as an element of a safety isolation system. For use with
higher continuous voltages, additional isolation/insulation systems must be used in
accordance with the safety standard requirements.
Use caution and follow all safety regulations when handling equipment subjected to
high voltages.
Touching any exposed circuitry on the target, the adapter, cables, or the I-jet probe can
cause injuries or death.
IAR Systems or the manufacturer shall not be liable for any damages related to the use
of this probe.
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I-jet
The MIPI-20 to ARM-20 adapter
The MIPI-20 to ARM-20 adapter is included with I-jet. It converts the MIPI-20 I-jet
cable to the legacy ARM-20 (0.1 in × 0.1 in pitch) JTAG headers. This is a diagram of
the adapter:
These are the pin definitions of the ARM-20 adapter:
Pin
nTRST
I-jet
direction
Output
Name
Description
Test Logic Reset
Test reset. Active LOW signal that resets the TAP
controller's state machine.
Table 9: ARM-20 pin definitions
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Technical specifications
Pin
I-jet
direction
Name
Description
TCK synchronizes all JTAG transactions. TCK
connects to all JTAG devices in the scan chain. TCK
flows down the stack of modules and connects to
each JTAG device. However, if there is a device in the
scan chain that synchronizes TCK to some other
clock, then all down-stream devices are connected to
the RTCK signal on that processor.
TCK
Output
Test Clock
TMS
Output
Test Mode Select TMS controls transitions in the tap controller state
machine. TMS connects to all JTAG devices in the
scan chain as the signal flows down the module stack.
TDI
Output
Test Data Input
TDO
Input
Test Data Output TDO is the return path of the test data input signal
TDI. In a multi-device JTAG chain, the TDO of the
first device connects to the TDI of the next device,
etc. The last device's TDO is connected to the TDO
on the JTAG header.
RTCK
Input
TCK Return
RTCK is a mechanism for returning the sampled
clock to the JTAG equipment, so that the clock is not
advanced until the synchronizing device captured the
data. In adaptive clocking mode, I-jet is required to
detect an edge on RTCK before changing TCK. In a
multi-device JTAG chain, the RTCK output from a
device connects to the TCK input of the
down-stream device.
If there are no synchronizing devices in the scan
chain, it is unnecessary to use the RTCK signal and it
is connected to ground on the target board.
VTref
Input
Voltage Target
Reference
This is the target reference voltage. It indicates that
the target has power. VTref is normally fed from Vdd
on the target hardware and might have a series
resistor (though this is not recommended).
VTref is used by I-jet to detect if target power is
active and to set JTAG signal voltage reference for
level translators.
Table 9: ARM-20 pin definitions
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TDI is the test data input signal that is routed to the
TDI input of the first device in the scan chain.
I-jet
Pin
I-jet
direction
Name
Description
nSRST
I/O
System Reset
Active LOW open-collector signal that is driven by
I-jet to reset the device and/or the target board.
I-jet senses this line to determine when you have
reset the device.
Vsupply
Output
--
This pin is not connected to I-jet.
DBGRQ
Output
--
This pin is not connected on I-jet.
DBGAC
K/TRGP
WR
Output
Target Power
This pin is used under SW control to supply 5 V
power to the target board. It should be routed
through a jumper shunt to the 5 V DC board input to
eliminate the power adapter during debugging. The
maximum current supplied by I-jet on this pin is
about 420 mA. When the current supplied reaches
~500 mA, the power will be shut down for
protection.
Table 9: ARM-20 pin definitions
The R2 pull-down on pin 17 of the I-jet MIPI20 connector is a signal to I-jet that a legacy
ARM-20 adapter is being used. Other adapters will have different resistors so that I-jet
can identify them if needed. A solid GND on this pin means that no adapter is being used
and that the MIPI cable is connected directly between the I-jet and the target board.
The ADA-MIPI20-TI14 adapter
The ADA-MIPI20-TI14 adapter converts the I-jet standard MIPI-20 cable pinout to the
Texas Instruments legacy 14-pin JTAG interface used on older OMAP and other
TMS320, TMS470, and TMS570 target boards.
The adapter has the MIPI-20 ale header on top for connecting the I-jet MIPI-20 cable
and a TI-14-style female header (socket) on the bottom. The TI-14 JTAG header is a
14-pin, double-row, 0.1 in × 0.1 in (2.56 mm × 2.56 mm) pitch connector with a key
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Technical specifications
(plug) in position 6 to prevent misconnections. In case the plug is missing, a white arrow
on pin 1 of the TI-14 connector helps you ensure proper orientation.
This is a diagram of the adapter:
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I-jet
These are the pin definitions for the TI-14 adapter:
Pin
I-jet
direction
Name
Description
nTRST
Output
Test Logic
Reset
Active LOW signal that causes all test and debug
logic in the device to be reset along with the IEEE
1149.1 TAP.
TCK
Output
Test Clock
This is the test clock used for driving the IEEE
1149.1 TAP state machine and logic.
TMS
Output
Test Mode
Select
Directs the next state of the IEEE 1149.1 TAP state
machine.
TDI
Output
Test Data Input IEEE 1149.1 scan data input to the device.
TDO
Input
Test Data
Output
IEEE 1149.1 scan data output from the device.
RTCK
Input
TCK Return
Used only in Adaptive Clocking mode. I-jet
monitors RTCK to determine when to send the
next TCK.
PD
Input
Power Detect
Should be ties to the I/O voltage of the target
device. Used by I-jet to detect whether target
power is active and to set the JTAG signal voltage
reference for level translators.
EMU0
I/O
Emulation 0
Depending on the device, EMU pins support boot
modes and other features. I-jet does not use this
pin but it is routed to the TRACEDATA[2] pin on
the MIPI20 connector. For proper booting, this pin
should be pulled up on the target.
EMU1
I/O
Emulation 1
Depending on the device, EMU pins support boot
modes and other features. I-jet does not use this
pin but it is routed to the TRACEDATA[3] pin on
the MIPI20 connector. For proper booting, this pin
should be pulled up on the target.
Table 10: Pin definitions for the TI-14 adapter
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Technical specifications
This is the pinout of the target cTI20 JTAG header. Pin 6 should be missing to indicate
the proper orientation.
These are the top view dimensions of the ADA-MIPI20-TI14 adapter:
A
18.9 mm (0.74 in)
B
25.4 mm (1.0 in)
C
19.4 mm (0.76 in)
D
1.6 mm (0.062 in)
J
9.6 mm (0.38 in)
K
20.3 mm (0.80 in)
TI14 header information (for target board)
The TI14 header is manufactured by Samtec USA. The model number is TSM-17-DV.
For more information, see the manufacturer's web page:
http://samtec.com/technical_specifications/ovreview.aspx?series=T
SM
The ADA-MIPI20-cTI20 adapter
The ADA-MIPI20-cTI20 adapter adapts the I-jet standard MIPI-20 cable pinout to the
Texas Instruments compact 20-pin JTAG interface used on some newer OMAP,
DaVinci, and other TMS320, TMS470, and TMS570 target boards.
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AFE1_AFE2-1:1
I-jet
The adapter has the MIPI-20 male header on top for connecting the I-jet MIPI-20 cable,
and a cTI-20 style female header (socket) on the bottom. The cTI-20 JTAG header is a
20-pin, double-row, high-density 0.05 in × 0.1 in (1.27 mm × 2.56 mm) pitch connector
with a key (plug) in position 6 to prevent misconnections. In case the plug is missing, a
white arrow on pin 1 of the cTI-20 connector helps you ensure proper orientation.
This is a diagram of the adapter:
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Technical specifications
These are the pin definitions for cTI20:
Pin
I-jet
direction
Name
Description
Active LOW signal that causes all test and debug logic in
the device to be reset along with the IEEE 1149.1 TAP.
nTRST
Output
Test Logic
Reset
TCK
Output
Test Clock This is the test clock used to drive the IEEE 1149.1 TAP
state machine and logic.
TMS
Output
Test Mode Directs the next state of the IEEE 1149.1 TAP state
Select
machine.
TDI
Output
Test Data
Input
IEEE 1149.1 scan data input to the device.
TDO
Input
Test Data
Output
IEEE 1149.1 scan data output from the device.
RTCK
Input
TCK
Return
Used only in Adaptive Clocking mode. I-jet monitors
RTCK to determine when to send the next TCK.
PD
Input
Power
Detect
Should be tied to the I/O voltage of the target device.
Used by I-jet to detect if target power is active and to
set the JTAG signal voltage reference for level
translators.
EMU0
I/O
Emulation 0 Depending on the device, EMU pins support boot
modes and other features. I-jet does not use this pin but
it is routed to the TRACEDATA[2] pin on the MIPI20
connector. For proper booting, this pin should be
pulled-up on the target.
EMU1
I/O
Emulation 1 Depending on the device, EMU pins support boot
modes and other features. I-jet does not use this pin but
it is routed to the TRACEDATA[3] pin on the MIPI20
connector. For proper booting, this pin should be
pulled-up on the target.
nRESET
I/O
System
Reset
Table 11: cTI20 pin definitions
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AFE1_AFE2-1:1
Active LOW open-collector signal that can be driven by
I-jet to reset the device and/or the target board.
I-jet senses this line to determine when a board has
been reset by the user or by watchdog timer.
I-jet
This is the pinout of the target cTI20 JTAG header. Pin 6 should be missing to indicate
the proper orientation.
TMS
1
2
nTRST
TDI
3
4
TDIS
TVD (PD)
5
6
KEY
TDO
7
8
GND
TCKRTN
9
10
GND
TCK
11
12
GND
EMU0
13
14
EMU1
nSYSRST
15
16
GND
EMU2 (NC)
17
18
EMU3 (NC)
EMU4 (NC)
19
20
GND
These are the top view dimensions of the ADA-MIPI20-cTI20 adapter:
A
18.9 mm (0.74 in)
B
17.7 mm (0.7 in)
C
19.4 mm (0.76 in)
D
1.8 mm (0.07 in)
J
6.0 mm (0.24 in)
K
12.8 mm (0.50 in)
These are the side view dimensions of the ADA-MIPI20-cTI20 adapter:
G
0.5 mm (0.19 in)
H
5.1 mm (0.2 in)
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Technical specifications
I
9.1 mm (0.36 in)
cTI20 header information (for target board)
The cTI20 header is manufactured by Samtec USA. The model number is
FTR-110-51-S-D-06. For more information, see the manufacturer's web page
http://www.samtec.com/technical_specifications/overview.aspx?seri
es=FTR.
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I-jet Trace
●
Introduction
●
Working with I-jet Trace
●
Technical specifications
Introduction
These topics are covered:
●
The I-jet Trace CM and I-jet Trace A/R/M in-circuit debugging probes
●
Requirements
●
Target connections.
THE I-JET TRACE CM AND I-JET TRACE A/R/M IN-CIRCUIT
DEBUGGING PROBES
I-jet Trace CM and I-jet Trace A/R/M are in-circuit debugging probes, designed to take
full advantage of the speed and current delivery of the USB3 communication ports. USB
2.0 is also supported, but not recommended due to slower speed and smaller power
delivery.
I-jet Trace CM and I-jet Trace A/R/M have all the features of I-jet, but with enhanced
performance and ETM (Embedded Trace Macrocell) support, which allows for
real-time tracing of the instruction and data over a 1-, 2- or 4-bit trace bus on Cortex-M
devices.
I-jet Trace A/R/M provides extensive debug and trace functionality for ARM Cortex
devices equipped with the CoreSightTM debug interface. I-jet Trace A/R/M is equipped
with up to 16-bit wide trace data collection.
Hereafter, whenever I-jet Trace is mentioned in this document, both the I-jet Trace CM
and the I-Jet Trace A/R/M probes are referred to, unless otherwise explicitly specified.
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AFE1_AFE2-1:1
Introduction
I-jet Trace CM connects to the target board via a MIPI-20 header. I-jet Trace A/R/M by
default connects to target via the Mictor-38 headers, but it also supports the MIPI20
headers. The probes connect to the host computer via the USB port.
C-SPY debugger
C-SPY driver
USB connection
I-jet Trace
MIPI-20 or
Mictor-38
I-jet Trace streams the program counter, variables, and power measurement data to the
host computer to provide a view into program execution in real time. Besides the typical
JTAG debugging, I-jet Trace is capable of providing power to the target board and
measuring it with sufficient accuracy to provide a power profile during program
execution in real time. This feature is referred to as power debugging.
For debugging Cortex devices, I-jet Trace also supports the SWO (Serial Wire Output)
feature, which can be used for tracing the program execution and tracking variables at
predefined points in your code.
The I-jet Trace in-circuit debugging probe is also referred to as a debug probe, debug
adapter, or JTAG in-circuit emulator by different tool vendors.
REQUIREMENTS
I-jet Trace needs to be controlled by the IAR C-SPY® Debugger which comes with the
IAR Embedded Workbench® IDE.
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I-jet Trace
TARGET CONNECTIONS
These target interfaces are supported:
●
MIPI-20, for up to 4-bit wide trace (part number SHF-110-01-L-D): JTAG, SWD,
cJTAG, SWO, ETM
●
MIPI-10 for debugging without trace (part number SHF-105-01-L-D): JTAG, SWD,
cJTAG, SWO
●
ARM-20 for debugging without trace (part number HTST-110-01-L-DV): JTAG,
SWD, cJTAG, SWO
●
Mictor-38 for up to 16-bit wide trace (I-jet Trace A/R/M only): JTAG, SWD,
cJTAG, ETM, and SWO
●
MIPI-60 (with trace) and TI-14/cTI-20 (without trace) connections via optional
adapters
I-jet Trace CM comes with a MIPI-20 connector on the front panel and with MIPI-20
and MIPI-10 cables, as well as a legacy ARM-20 adapter.
I-jet Trace A/R/M comes with an adapter board with a Mictor-38 connector that plugs
directly into the target board. For boards that do not use the high-speed Mictor
connector, the pod also supports the standard MIPI-20 headers.
Note: Only the MIPI-20 and Mictor-38 cables support the ETM trace functionality. All
other connections (MIPI-10 and ARM-20) are only for plain JTAG/SWD/SWO/cJTAG
debugging.
All I-jet adapters are compatible with I-jet Trace.
Working with I-jet Trace
These tasks are covered:
●
Setup and installation
●
Connecting the target system
●
Using trace
●
Updating the probe firmware
For information about debugging using I-jet Trace, see the C-SPY® Debugging Guide
for ARM.
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AFE1_AFE2-1:1
Working with I-jet Trace
SETUP AND INSTALLATION
Software
Before you can use I-jet Trace, you need to install IAR Embedded Workbench for ARM.
For more information, see the Quick Reference Installation and Licensing guide.
Probe setup
I-jet Trace does not require any special driver software installation. Normally, all drivers
for I-jet Trace are automatically installed as part of the installation of IAR Embedded
Workbench.
If you need to install the USB driver manually, navigate to
\Program Files\IAR Systems\Embedded Workbench x.x\arm\drivers\jet
\USB3\32-bit or 64-bit (depending on your system). Start the dpinst.exe
application. This will install the USB driver.
The USB LED will flash twice after enumerating on the USB2 ports, and three times on
USB3 ports.
For information about using multiple I-jet probes on the same host computer, see the
C-SPY® Debugging Guide for ARM.
CONNECTING THE TARGET SYSTEM
Power-up your I-jet Trace probe
1 Connect I-jet Trace to the host computer using the USB3 micro cable or any other
compatible high-quality USB3 cable.
2 Connect I-jet Trace to the target board using the cable that matches the target board
connector (MIPI-20, MIPI-10, or Mictor-38). If a standard JTAG connector is used,
you must first plug the ARM-20 to MIPI-20 adapter into the JTAG connector.
Note: No harm is done if the above order is reversed.
To prevent damage, the target GND and the USB host GND must be at the same level.
When hot-plugging, make sure that the PC and the target board power supply are
connected to the same grounded wall outlet or a common grounded desktop power strip.
Supplying target power from I-jet Trace
I-jet Trace can supply power to the target board only through the MIPI-20 and ARM-20
connections. The Mictor interface does not facilitate powering targets from the debug
probes.
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AFE1_AFE2-1:1
I-jet Trace
I-jet Trace CM can supply a maximum of 4.66 V at 200 mA when using USB3 ports
without the need of plugging in an external 5 V DC power supply.
I-jet Trace A/R/M must use the supplied (5 V DC at 2 A) power adapter to power a target
board. When it is not powering the target, I-jet Trace A/R/M does not need the external
power supply as long as it is connected to the USB3 port.
Power up your evaluation board
If you have an evaluation board that is prepared for it, you can power the board via I-jet
Trace through pin 19 on the standard ARM-20 connector, or pin 11/13 on the small
MIPI-20 connector. Target power of up to 400 mA can be supplied from I-jet Trace with
overload protection. Most of the IAR Systems KickStart Kits contain an evaluation
board that can be powered this way. Make sure that the power jumper found on most of
these boards matches your setup.
Note: The target board will get power via I-Jet Trace once you choose the Download
and Debug or Debug without Downloading command in C-SPY, but not before.
Note: The only way to use the power debugging feature is to power up your evaluation
board via I-jet Trace or to use I-scope.
USING TRACE
To use ETM trace, the target board must have a Cortex device with the ETM/PTM trace
pins (usually named TraceCLK and TraceDxx), and these pins must be connected to the
debug connector. Because on some devices, the trace pins are multiplexed, take care not
to connect these pins to other logic devices on the PCB to minimize the loading and
improve signal integrity.
C-SPY will initialize and enable all necessary registers on the MCU to allow the ETM
port to function properly so that no special user code instrumentation is necessary.
However, take care so that the running application code does not interfere (read, write,
etc.) with the GPIO pins used for the ETM trace.
The TRC LED on the I-jet Trace debug probe will turn green when trace data is being
collected. This usually happens after trace is enabled in C-SPY and the Run command
is issued.
For more information about trace, see the C-SPY Debugging Guide.
UPDATING THE PROBE FIRMWARE
For more information, see Updating the probe firmware, page 9.
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Technical specifications
Technical specifications
Reference information about:
●
The I-jet Trace package, page 40
●
Model specifications, page 40
●
Hardware revision history, page 42
●
Connectors, page 43
●
Indicators, page 45
●
Adapters, page 47
●
Designing target boards for ETM trace, page 51
●
General PCB layout guidelines, page 51
THE I-JET TRACE PACKAGE
The I-jet Trace package contains:
●
The I-jet Trace in-circuit debugging probe
●
MIPI-20 JTAG cable
●
MIPI-10 JTAG cable
●
USB3 A to micro-B cable
●
MIPI-20 to ARM-20 adapter
●
Welcome letter.
The I-jet Trace A/R/M package also contains:
●
Mictor-38 adapter board attached to two 60-wire flat cables
MODEL SPECIFICATIONS
These are the specifications of I-jet Trace:
USB speed
4.8 Gbps (USB 3 SuperSpeed)
480 Mbps (USB 2.0 Hi-Speed)
USB connection
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AFE1_AFE2-1:1
USB 3 Micro-B (USB 2.0
Micro-B-compatible)
I-jet Trace
Target connection
MIPI-20 (ETM, JTAG, cJTAG, SWO, and
SWD)
MIPI-10 (JTAG and SWD)
ARM-20 (JTAG and SWD)
Mictor-38 (I-jet Trace A/R/M only) (ETM,
JTAG, cJTAG, SWO, and SWD)
External DC power input
5 V DC, 2 A, 1.3 × 3.5 mm
(not supplied with I-jet Trace CM)
Adapters included
ADA-MIPI-20-ARM-20
Debug interface
ETM, JTAG, cJTAG, SWO, and SWD
JTAG/SWD/cJTAG maximum clock
100 MHz
JTAG/SWD clock rise & fall time
EmuDiag to open the
EmuDiag dialog box where you can find both hardware and firmware versions of the
plugged-in I-jet.
CONNECTORS
External power
I-jet Trace has a small (1.35 mm × 3.5 mm) external power connector right next to the
USB connector. It can be used whenever the host computer is unable to deliver the
necessary power to I-jet Trace and to the target board. The external power supply must
deliver 5 V DC at 1 A minimum for I-jet Trace CM and 2 A minimum for I-jet Trace
A/R/M.
When external power is connected, almost the entire power will be taken from the
external power supply, allowing more power-consuming targets (up to 600 mA) to be
powered by I-jet Trace.
I-scope connector
The I-scope connector on the side of the probe is provided for connecting the I-scope
analog probe to the I-jet Trace. Unlike I-jet, I-scope cannot be connected to the same
MIPI-20 connector that is used for target boards. When I-scope is connected to I-jet
Trace, the Target connector on I-scope cannot be used.
Expansion connector
This 30-pin connector is reserved for future use to add more functionality and features
to I-jet Trace.
Target connector
I-jet Trace CM comes with a MIPI-20 connector that allows a standard 20-pin flat cable
(included) to connect to a target with a MIPI-20 male header. This target connection
allows for JTAG/SWD/cJTAG debugging as well as 1-, 2-, or 4-bit ETM or SWO trace.
The MIPI-20 pinout for I-jet Trace CM is the same as for I-jet.
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AFE1_AFE2-1:1
Technical specifications
I-jet Trace A/R/M comes with two 60-pin flat cables that terminate in an adapter board
with a Mictor-38 male connector that is designed to plug in directly into the target board.
The Mictor connector allows for JTAG/SWD/cJTAG/SWO debugging as well as for up
to 16-bit wide ETM trace.
The adapter board also contains a standard MIPI-20 header for connecting to target
boards without the Mictor connection.
This is the Mictor-38 pinout for I-jet Trace A/R/M:
Signal
GND
Pin
Pin
1
2
3
4
5
6
Signal
TRACECLK
TRIGIN
7
8
TRIGOUT
nSRST
9
10
EXTTRIG
TDO
11
12
VTREF
RTCK
13
14
VSUPPLY (not used)
TCK
15
16
TRACEDATA[07]
TMS
17
18
TRACEDATA[06]
TDI
19
20
TRACEDATA[05]
nTRST
21
22
TRACEDATA[04]
TRACEDATA[15]
23
24
TRACEDATA[03]
TRACEDATA[14]
25
26
TRACEDATA[02]
TRACEDATA[13]
27
28
TRACEDATA[01]
TRACEDATA[12]
29
30
TRACEDATA[11]
31
32
TRACEDATA[10]
33
34
TRACEDATA[09]
35
36
TRACECTL
TRACEDATA[08]
37
38
TRACEDATA[00]
Table 14: The Mictor-38 pinout for I-jet Trace A/R/M
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I-jet Trace
The mating connector for Mictor-38 on target board is AMP/Tyco 5767054-1.
INDICATORS
I-jet Trace has four LED indicators on the top, marked TRC, TPWR, DBG, and USB.
This section describes the indicators and their statuses.
The TRC indicator
Indicator status
Description
Off
No trace.
Green
Collecting trace data and trace clock is present.
Red
Trace data collection is enabled but the trace clock is not present.
Orange blinking
Collecting SWO trace data.
Table 15: TRC indicator statuses
The TPWR indicator (Target power)
Indicator status
Description
Off
Power to target is not provided by I-jet.
Green
Power to target is provided by I-jet.
Yellow
Warning. Power to target is close to the overcurrent limit.
Table 16: TPWR indicator statuses
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AFE1_AFE2-1:1
Technical specifications
Indicator status
Description
Red
Error. Overcurrent limit detected and power to target was switched off
for protection.
Table 16: TPWR indicator statuses
The DBG indicator (JTAG/SWD/cJTAG)
Indicator status
Description
Off
vTRef on JTAG header is too low.
Green
vTRef is at or above 1.2 V.
Green blinking
Indicates JTAG/cJTAG/SWD communication activity from the target
Table 17: JTAG indicator statuses
The USB indicator
Indicator status
Description
Off
No USB power.
Green steady
Initial state or no transfer.
Green blinking
USB transfers to or from I-jet Trace.
Red blinking
USB enumeration.
Red steady
USB did not enumerate or the hardware is broken.
Table 18: USB indicator statuses
ADAPTERS
ADA-MIPI20-MICTOR adapter
The ADA-MIPI20-MICTOR adapter coverts the I-jet Trace CM standard MIPI-20 cable
pinout to the high-speed Mictor 38-pin trace connector used on some target boards.
The adapter has the MIPI-20 male header on top for connecting the I-jet Trace CM
MIPI-20 cable and the Mictor-style male header that straddles the edge of the PCB. This
Mictor connector (AMP/Tyco 576006-1) mates with target boards with a female Mictor
46
AFE1_AFE2-1:1
I-jet Trace
(AMP/Tyco 5767054-1) connector). These connectors are keyed to prevent incorrect
insertion.
Signal
GND
nSRST
Pin
Pin
1
2
3
4
5
6
7
8
9
10
Signal
TRACECLK
Table 19: ADA-MIPI20-MICTOR adapter pinout
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AFE1_AFE2-1:1
Technical specifications
Signal
Pin
Pin
Signal
TDO
11
12
VTREF
RTCK*
13
14
VSUPPLY
TCK
15
16
TMS
17
18
TDI
19
20
nTSRST*
21
22
23
24
TD[3]
25
26
TD[2]
27
28
TD[1]
29
30
31
32
33
34
35
36
37
38
TD[0]
Table 19: ADA-MIPI20-MICTOR adapter pinout
* The function of these pins are determined by the jumpers on the adapter.
ADA-MICTOR-MIPI60 adapter
The ADA-MICTOR-MIPI60 adapter converts the I-jet Trace A/R/M standard Mictor-38
pinout to the MIPI-60 trace connector used on some target boards.
The adapter has the Mictor-38 female connector on top for connecting the I-jet Trace
A/R/M and the MIPI-60-style male header on the bottom.
This MIPI-60 connector (Samtec QTH-030-01-F-DA) mates with target boards with a
female MIPI-60 connector (Samtec QSH-030-01-F-DA). These connectors are keyed to
prevent incorrect insertion.
48
AFE1_AFE2-1:1
I-jet Trace
Signal
Pin
Pin
Signal
VREF DEBUG
1
2
TMS
TCK
3
4
TDO
TDI
5
6
nSRST
RTCK
7
8
nTRST
9
10
DBGRQ
DBGACK
11
12
VREF TRACE
TRACECLK
13
14
GND
15
16
TRACECTL
17
18
TRACEDATA[00]
19
20
TRACEDATA[01]
21
22
TRACEDATA[02]
23
24
TRACEDATA[03]
25
26
TRACEDATA[04]
27
28
GND
Table 20: The MIPI60 pinout
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AFE1_AFE2-1:1
Technical specifications
Signal
Pin
Pin
TRACEDATA[05]
29
30
TRACEDATA[06]
31
32
TRACEDATA[07]
33
34
TRACEDATA[08]
35
36
TRACEDATA[09]
37
38
TRACEDATA[10]
39
40
TRACEDATA[11]
41
42
TRACEDATA[12]
43
44
TRACEDATA[13]
45
46
TRACEDATA[14]
47
48
TRACEDATA[15]
49
50
51
52
53
54
55
56
GND
57
58
GND
59
60
Signal
GND
Table 20: The MIPI60 pinout
DESIGNING TARGET BOARDS FOR ETM TRACE
Because ETM trace port signals might have very fast rise and fall times, (regardless of
the trace frequency), it is important that the target PCB is designed properly so it does
not distort the trace signals before they get to the connector.
It is recommended that the ETM trace signals be simulated for signal integrity on a
routed PCB by HyperLinx (or similar signal integrity SW) for best results.
Such SI tools will take into consideration the output impedance and rise and fall times
of the MCU trace port lines, the length, geometry, and impedance of the PCB traces, the
geometry of the layer stack as well as the dielectric properties of the PCB materials to
give a simulated graph of the resulting waveform at the trace connector or any other
place along the path.
If the resulting waveform is distorted, most simulation tools will help to determine the
optimal series termination resistor for each trace line.
Important: All trace data lines and trace clock must have a series resistor placed near
the MCU source pin. The resistor value will be determined by the simulation tools or
can be found experimentally by examining the live signal with an oscilloscope at the
trace connector.
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AFE1_AFE2-1:1
I-jet Trace
GENERAL PCB LAYOUT GUIDELINES
4-bit ETM trace
Cortex-M devices have only a 4-bit ETM trace port. These trace signals must be routed
to the standard 0.05 in × 0.05 in (1.27 × 1.27 mm) MIPI-20 connector header.
The recommended part number for a 4-bit ETM+JTAG debug connector is
SHF-110-01-L-D-SM by Samtec or any other compatible shrouded header. The header
should be positioned relatively close to the MCU (not more than 3 inches) so that its
even pins face the MCU because they have active signals on them.
16-bit ETM trace
Most Cortex-R and Cortex-A devices come with a 16-bit trace port. To accommodate
faster speeds, the signals must be connected to a 38-pin Mictor connector, making sure
the track lengths from the MCU are matched to be within 0.5 inches (12.5 mm) to
minimize signal skew.
The recommended part number for a 16-bit ETM+JTAG debug connector is 5767110-1
from AMP/Tyco.
The Mictor connector is designed to carry high-speed signals (10 Gb/s) and has a
characteristic impedance of 50 Ohm. To eliminate signal distortion, the ETM trace
signals on PCB must also have 50 Ohm impedance. The connector should be placed
relatively close to the MCU (not more than 3 inches).
PCB routing
These are useful hints for PCB routing:
●
Use series termination.
Place a series resistor on each trace signal near the source (MCU).
●
Minimize crosstalk.
Keep all high-speed (fast rise and fall times) signals away from other signals to
minimize crosstalk. Take special care of the TRACECLK signal.
●
Minimize signal skew.
Keep the individual trace port track lengths to be within 0.5 in of each other.
●
Match impedance.
Make the trace signal impedance 50 Ohm to match the impedance of the debug
connectors and the debug probes.
●
Minimize signal vias and avoid track stubs.
They might cause impedance mismatch, signal reflections, and distortions.
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AFE1_AFE2-1:1
Technical specifications
●
Avoid trace pin multiplexing.
Multiplexing of the trace pins with other functions increases track lengths and adds
capacitance and inductance and should be avoided. If multiplexing is required, the
designer should add jumpers to disconnect the trace pins from the other logic in case
the tracing signals are too distorted to function properly.
●
Use ground and power planes.
Using ground and power planes not only helps with power distribution, but also gives
the high-speed signals the shortest return path to ground, which results in less signal
loss. They also make the trace impedance matching easier and more consistent.
Trace signal requirements
I-jet Trace supports DDR (Double Data Rate) clocking mode, which means the data is
output on both edges of the TRACECLK signal. To compensate for variations in MCU
ETM logic and target board PCB layouts, I-jet Trace contains logic to delay the
TRACECLK and each TRACEDATA signal for up to 2.5 ns in 78 ps steps. This logic is
used to synchronize all trace data lines with the trace clock automatically to get the
optimum trace data collection.
Data setup and hold
The following graph and table show the minimum setup and hold timing requirements
of the trace signals with respect to TRACECLK. These timings are fixed by the MCU
manufacturers and might differ substantially from the data below, so they are given here
as an example only.
Parameter
Value
Tds
0.75 ns (minimum)
Data setup time
Tdh
0.75 ns (minimum)
Data hold time
Table 21: Data setup and hold times
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AFE1_AFE2-1:1
Description
I-jet Trace
Important: The minimum setup and hold times in the table are not as important as the
length of the data valid time, because of the logic inside the I-jet probe that can delay
the TRACECLK and TRACEDATA signals as needed, up to 2.5 ns. To get the best
results, the trace valid data (Tds + Tdh) should be as long as possible. The best way to
achieve that in the MCU or ASIC, is to make sure the trace data is changed in the middle
of the High or Low DDR TRACECLK signal. This way the trace data valid time is the
widest and the data setup and hold times are the biggest for a given frequency.
Switching thresholds
I-jet Trace measures the target signals reference voltage (VTref) at the debug connector
and automatically adjusts its switching thresholds to ½ of VTref. For example, on a
3.3 V target system, the switching thresholds are set to 1.65 V.
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Technical specifications
54
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I-scope
●
Introduction
●
Working with I-scope
●
Technical specifications
Introduction
These topics are covered:
●
Reasons for using I-scope
●
The I-scope probe
●
Current and voltage measurement using I-scope.
REASONS FOR USING I-SCOPE
The main benefit of using I-scope is to provide you with power data of the running
application in real time so you can view the power profile and optimize your code for
better power efficiency. The C-SPY Timeline window displays power data in correlation
with the application source code to enable power analysis of the program flow.
The analysis will reveal which functions and peripheral units consume more power,
which I/O activity causes current spikes, how much power the MCU consumes in
various sleep modes or in the main idle loop, etc. The captured data can be used to help
you make your design less power-consuming, as well as help you initialize the GPIOs
and peripheral units to achieve the best power efficiency without compromising the
target's performance.
THE I-SCOPE PROBE
IAR I-scope for I-jet/I-jet Trace plugs in between the I-jet/I-jet Trace in-circuit
debugging probe and the target board. I-scope adds detailed current and voltage
measurement capability to I-jet/I-jet Trace. These measurements can be done at any
designated points on the target board and displayed in real time by the IAR C-SPY
debugger.
CURRENT AND VOLTAGE MEASUREMENT USING I-SCOPE
I-scope contains a 12-bit A/D converter for current and voltage measurements. The
current input is implemented using a sensitive differential amplifier. The current
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AFE1_AFE2-1:1
Introduction
measurement is done by connecting the two differential current measurement leads
(marked I+ and I-) across a shunt resistor on the target board.
This figure shows how I-scope is connected to I-jet and to the target board:
This figure shows how I-scope is connected to I-jet Trace and to the target board:
56
AFE1_AFE2-1:1
I-scope
Many hardware engineers add small shunt resistors to the board to measure (using a
digital voltmeter) the currents taken by specific logic blocks or devices. This method is
mainly used in early stages of development. The shunt resistors are placed in series with
the power rail to be measured and they need to be small enough not to drop too much
voltage to make the logic block or MCU operate outside of its minimum voltage
requirements. For most MCUs, the power rails are specified within 100 mV of their
normal Vdd values and that is why I-scope is designed to work with shunt resistors that
will provide up to 100 mV voltage drop.
The calculation of the shunt resistor value is very simple. Assuming that the MCU's
maximum operating current at the selected clock speed and all peripherals enabled is
80 mA, Ohm's law will give the value for the shunt resistor as follows:
R = V/I = 0.1 V/0.08 A = 1.25 Ohm
Based on this example, the dynamic range of the power probe would be from about
20 uA (80 mA/4096) to 80 mA.
It is recommended to use 1% (or better) resistors to get good accuracy in the
measurements. If the calculated value does not match the standard resistor value, select
the next smaller value. In our example, the next smaller standard resistor value is
1.24 Ohm.
Larger resistor values can be used, but I-scope will hit its maximum allowed value at
110 mV and anything over this will be cut off. So if you want to measure some low-level
currents, you can use much bigger shunt resistors to get better resolution. Make sure that
the MCU Vdd line does not drop below the minimum allowed by the manufacturer when
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.
Working with I-scope
These tasks are covered:
●
Installation
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Technical specifications
INSTALLATION
1 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 58
●
External characteristics, page 59
●
I-scope probe specification, page 60.
THE I-SCOPE PACKAGE
The I-scope package contains:
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AFE1_AFE2-1:1
●
I-scope probe
●
Short MIPI-20 flat cable for attaching to I-jet/I-jet Trace
●
Two probes consisting of three flying test leads each
●
Six grabbers
●
Welcome letter.
I-scope
EXTERNAL CHARACTERISTICS
This figure shows the I-scope probe and its connections and switches:
These are descriptions of the I-scope connections and switches:
I+
Current probe positive (higher voltage) side of the shunt resistor. On MCU
power rails, this lead goes to the power supply side of the shunt resistor
(Vdd or Vcc).
Analog ground connection to target. This connection is optional if the
probe is connected to the target's JTAG header, but should be used when
more precise measurements are needed.
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Technical specifications
IV1
Current probe negative (lower voltage) side of the shunt resistor. On MCU
power rails, this lead should be on the MCU side of the shunt resistor (load
side).
The shunt resistor should be calculated to allow a voltage drop of around
100 mV when the MCU is operating at its maximum current consumption.
The voltage relative to ground can be measured separately on this input.
This allows measurement of both current and voltage at the selected
measurement point.
V2
Voltage probe channel for measuring voltages from 0 V to 6 V.
V3
Voltage probe channel for measuring voltages from 0 V to 6 V.
VTRef
Target reference voltage LED will turn green when the target voltage is
> 1.65 V. This is the minimum target voltage at which the I-jet/I-jet Trace
will operate.
RDY
Ready LED will turn yellow as soon as the power probe is enabled. After
I-jet/I-jet Trace calibrates the probe, the RDY LED will turn green to
indicate that I-scope is ready to be used.
Target
Connector for a cable that goes to the target's board JTAG header.
I-jet
Connector for a cable that goes to I-jet/I-jet Trace.
TPWR
Target power switch. When in position 0 (off), it will disconnect the
I-jet/I-jet Trace target power rail (TPWR) from going to the target. The
default position is 1 (on), which allows I-jet/I-jet Trace to supply 5 V power
to target boards. However, target board power measurements will not be
accurate and should not be used when I-scope is connected.
I-SCOPE PROBE SPECIFICATION
60
AFE1_AFE2-1:1
Size (W * L * H)
700 mm * 44 mm * 14 mm
ADC resolution
12 bits
Maximum sampling rate
200 ksps
V1, V2, V3 voltage channels range
0 to 6 V
V1, V2, V3 voltage channels
resolution
1.49 mV (1 LSB)
V1, V2, V3 voltage channels
accuracy
2.98 mV (2 LSB)
I-scope
Maximum differential voltage
between I+ and I- probes
110 mV
These are the I-scope specifications per shunt:
1 Ohm shunt
Current channel resolution 26.8 uA
10 Ohm shunt
100 Ohm shunt
2.68 uA
0.268 uA
Current channel accuracy
53.7 uA
5.37 uA
0.537 uA
Current channel
measurement range
0-110 mA
0-11 mA
0-1.1 mA
Applications
General purpose
MCU current and
power
measurements
Low-power MCU Measuring power-down
current and power and sleep modes
measurements
current consumption
Table 22: I-scope specifications per shunt
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AFE1_AFE2-1:1
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