IVT-C - Isabellenhuette Heusler GmbH & Co KG

ISAscale ® // High precision measurement 

IVT-C 

Brief datasheet 

Function Description 

System integration 

By power-on the device performs an internal diagnostic check. 

After that the user defined configuration, operation mode and 

overcurrent thresholds are loaded from nonvolatile memory. 

A Primary Channel and a Secondary Channel are measuring alternately 

at an internal sample rate of approx. 3500 Hz. 

The IVT-C is a high precision shunt based current, voltage and 

temperature measurement system. The module consists of a 

printed circuit board directly connected onto an Isabellenhütte low 

resistor shunt. The measurement system is using a microcontroller. 

Communication is provided by an isolated CAN interface. 

Additional Features (optional) 

– Over current detection line (OCS) 

The module contains hardware over-current detection for both 

current directions. As soon as the over current is detected the 

alarm line OCS is activated which signals an over current condition 

to the external circuit. 

– TRIGGER signal line 

The module provides a TRIGGER input signal line. The TRIGGER 

signal could be used to synchronize the measurement between 

the module and an external hardware like a battery management 

system. The TRIGGER input line is fed through a K-Line Driver, 

so the input signal is in the same range as the supply voltage. 

The signal is high active. A low to high transition triggers the 

measurement. 

The Primary channel always measures Input 1 (current input). The 

Secondary Channel may be configured to measure one of the following 

inputs: 

Input 1 

Current 

Input 2 Voltage 1 



Input 5 

Internal temperature 

Each measuring cycle consists of at least one Primary channel 

measurement (always current) and one secondary channel measurement. 

The measurement cycle may be configured to consist of 

up to 5 different secondary channel measurements. The secondary 

measurements are performed in a circle style. 

Application 

– Hybrid- and full electric drive/Lithium-Ion battery 

– BMS 

– Electric vehicle 

– Stationary battery storage system 

– Charging station 

– Full cell control 

Issue IVT-C-2012-11-01 // Version 1.0 

Isabellenhütte Heusler GmbH & Co. KG // isascale@isabellenhuette.de // The current valid issue of the data sheet can be found on www.isabellenhuette.de 

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Additionally all measurements may be averaged over a configurable 

number of measurement cycles. There are three options of 

triggering the transmission of measurement results: 

– Free running measurement mode: 

Every time a measurement cycle has completed, result messages 

are transmitted. The number of average values determines the 

interval of transmitting result messages. 

– Hardware triggered measurement mode: 

As soon as the TRIGGER signal is detected, a complete cycle, 

determined by configuration of secondary channel and average 

configuration, is performed and after completion one to three 

result messages are sent. 

– Message triggered measurement mode: 

As soon as the request message is received, a complete cycle, 

determined by configuration of secondary channel and average 

configuration, is performed and after completion one to three 

result messages are sent. 

A CAN message containing measurement results, holds at least 

one of two possible measured values. There are up to three different 

measurement messages possible, separated by three different 

CAN-IDs. 

If the input signal of the current input exceeds the nominal 

measurement range, an automatic range switching to an extended 

range is performed. 

Technical Data 

Operation conditions 

Parameter Min. Typ. Max. Unit 

Operating temperature − 40 +105 °C 

Storage temperature − 40 +125 °C 

Supply voltage +7 +12 +16 V 

Supply current 50 60 120 mA 

Start up time 50 ms 

Current measurement characteristics nominal range 


Nominal measurement range − 320 +320 A 

Extended measurement range − 1500 +1500 A 

Initial Error − 0.1 +0.1 % rdg 

Total error [− 20…+60°C] without temperature calibration − 0.5 +0.5 % rdg 


Total error [− 20…+60°C] with temperature calibration opt. − 0.2 +0.2 % rdg 

Total error [− 40…+85°C] with temperature calibration opt. − 0.4 +0.4 % rdg 

Offset (not included in error) − 50 +50 mA 

Noise 120 mA pp 

Physical resolution 10 mA 


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Isabellenhütte Heusler GmbH & Co. KG // isascale@isabellenhuette.de // The current valid issue of the data sheet can be found on www.isabellenhuette.de



Technical Data 

HV voltage measurement parameters nominal range 


Nominal measurement range − 620 +620 V 

Initial Error − 0.1 +0.1 % rdg 



Total error [− 20…+60°C] with temperature calibration − 0.5 +0.5 % rdg 

Total error [− 40…+85°C] with temperature calibration − 1.0 +1.0 % rdg 

Offset (not included in error) − 100 +100 mV 

Noise 120 mV pp 

Physical resolution 30 mV 

Input resistance 3.3 mOhm 

Temperature measurement 

The internal temperature measurement is performed on the PCB which is thermally connected to the shunt by the direct solder joint. It 

does not represent the hot spot temperature of the shunt but more likely the average temperature of the module (PCB and shunt). 


Measurement range − 40 +105 °C 

Resolution 0.1 °C 

Error (0°C to 85°C) − 2 +2 °C 

Error (− 40°C to 105°C) − 4 +4 °C 


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Mechanical Dimension 


Isabellenhütte Heusler GmbH & Co. KG // isascale@isabellenhuette.de // The current valid issue of the data sheet can be found on www.isabellenhuette.de 

04 / 05



Pin Configuration 

HV measurement inputs 

The module has three high voltage inputs capable of bipolar measurement. 

The common reference point of all of them is the negative 

side of the shunt. Voltage 1 and 2 inputs may be switched off to 

minimize current drawn from the battery. Due to a MOSFET transistor 

switch Voltage 2 input is able to switch off only positive voltages. 

If a negative voltage the switch is always on. Voltage 3 input cannot 

be switched off. 

Interface / Power Supply 

Power Supply 

Isolated CAN 

Isolated signal lines 

+12V DC 

GND 

CAN-H 

CAN-L 

CAN-T-A (termination connector) 

CAN-T-B (termination connector) 

OCS (over current detect output) 

SYNC (synchronization input) 

If Pins 8 (CAN-T-B) and 4 (CAN-T-A) are shortened externally, the 

module’s internal CAN bus termination is activated. 

Connectors 

The module is equipped with four Molex Micro Fit 3.0 male connectors. 

An 8 pin connector is used for the connection to the LV side. 

The three HV voltages can be connected to 2 pin connectors. The 

two pins of each HV connector are shorted together internally. 

Connector pin assignment 

Communication 

CAN communication description 

Communication consists of a small amount of CAN messages with different CAN IDs at a default speed of 500 kbits/s. There is one 

transmit message (named command message) and four receive messages (one response message and three result messages) seen from 

the host’s point of view. Different commands are realized by a Command-ID-byte on position DB0. The response message is reported as 

a response to a command. The three result messages contain measurement results. All five CAN IDs may be permanently changed by a 

user command. The CAN speed may be permanently changed to several bitrates. 

Warranty // All information regarding the suitability, workability and applicability of our products, all technical advice and other information are provided to the 

best of our knowledge and belief, but shall not discharge the buyer from his own examinations and tests. This document is subject to change without notice. 


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IVT-C - Isabellenhuette Heusler GmbH & Co KG

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