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Solutions for Precision Current Sensing and High-Voltage Isolation Monitoring

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ES Components is a authorized distributor and sales representative for Sendyne. 


Solutions for Increased Battery Energy Utilization (SFP200MOD) and High-Voltage Isolation Monitoring (SIM100):

SFP200MOD Current and Voltage Measurement Module

Advantage over hall-effect type sensors: Far more accurate and not susceptible to noise

Dramatic Improvement Over Hall Effect Sensors
Direct versus Hall Effect Current Measurement
  • Precision temperature-compensated current measurement
  • Voltage monitoring
  • Direct path real-time coulomb counting
  • Patented zero offset automatic calibration
  • Enables accurate real-time determination of battery State of Charge (SOC) and State of Health (SOH)
  • < ±1% Typical accuracy (-40 °C to +125 °C) on standard grade modules
  • ±0.05% Typical accuracy (-40 °C to +125 °C) on LAB grade modules
  • Wide dynamic range (milli-Amps to 1000+ Amps) modules available


The SFP200MOD is the first turnkey module capable of precisely measuring currents from milli-Amps to 1000+ Amps, while simultaneously measuring three high-voltage potentials (800 V nominal, 1000 V / channel max) accurately. Designed specifically for the needs of electric vehicles (EVs) and Energy Storage Systems (ESS), this cost-effective, automotive grade member of Sendyne’s SFP family communicates via an isolated CAN 2.0B interface (500 kbit/s)

Note:  Customized versions with different measurement ranges and system interfaces can be made available.  Please contact us if you need something that you don't see here.


  • Accurate direct current path measurement
  • 18 uΩ enables high current measurement with minimal power dissipation
  • Resolves currents from milli-Amps to 1000A
  • Enables accurate measurements of battery state-of-charge
  • Pre-engineered turnkey solution
  • Typically achieves < 1 % accuracy of current measurement over one measurement range
  • CAN 2.0B interface (500 kbits/s)
  • Three voltage measurement inputs for monitoring items such as fuses, contactors, etc.
  • Accurate temperature measurements
  • Automotive temperature range of –40 °C to +125 °C
  • Low power consumption
  • Isolated front end for “high” or “low” side current sensing and attenuation of system-induced noise
  • Built-in calibration for current measurements
  • Built-in compensation for resistance dependence of the shunt on temperature
  • Built-in calibration for voltage measurements
  • Temperature reporting in degrees Celsius
  • Separate Charge, Discharge, and Total coulomb counters

Precision Current Measurement in Battery Management Systems (BMS)

  • Energy Storage Systems
  • Electric Industrial Vehicles
  • Grid Storage
  • Wind Farms
  • Solar Farms
  • Industrial
  • Railroad
  • Military
  • Electric/Hybrid Cars and Buses

SFP200MOD Datasheet

SFP200MOD CAN Bus Protocol

ESC - Sendyne Brochure

White Paper - Achieving accurate measurement of large DC currents, by Victor Marten, Sendyne Corp.

Solution for Isolation Monitoring in High-Voltage Systems:

SIM100 Isolation Monitor

Features and Benefits

Picture of SIM100 High Voltage Isolation Monitor
  • Helps protect first responders
  • Monitors and identifies insulation problems before they result in potentially catastrophic failure conditions
  • Provides constant monitoring during electrical system operating and standby modes
  • Patented technology
  • Operates correctly even when the system is experiencing large variations

Typical Applications

  • Electric and hybrid vehicles
  • Charging stations
  • High-voltage Industrial electrical systems
  • Energy storage systems

Feature Comparison

Feature Sendyne SIM100 Competition
Standby Battery State System Isolation Monitoring Yes Yes
Active Battery StateSystem Isolation Monitoring Yes No or very slow response
System Capacitance (parasitic and intentional)
Measured and Readable
Yes No
Stored energy on the System Capacitance, Measured and Readable Yes No
Isolation Resistance, Measured and Readable Yes Yes
Isolation Resistance reported in Ohms/V per relevant standards Yes No
Monitored assured connection to the Chassis Yes Yes
Monitored assured connections tothe Battery terminals Yes No
Designed as a component for systems complying with ISO6569-3:2011-12, UL 2231-1, UL2231-2, IEC 61557, CFR 571.305 and other applicable standards. Yes Yes

Overview of SIM100 Isolation Monitor

The Sendyne SIM100MOD is a high voltage isolation monitoring device for electrical systems.  The isolation monitor operates correctly even when the battery is active, and experience large variations.

The Advantage of Active and Standby High Voltage System Monitoring

The SIM100MOD continuously monitors the isolation resistance between vehicles IT (Isolated Terra) power system and chassis for deterioration of insulation and potentially dangerous levels of leakage current.

The module detects all sources of leakage, including multiple, simultaneous symmetrical and asymmetrical faults, as well as resistive paths between the chassis and points in the battery with the same potential as the chassis. The measured data is filtered by an advanced algorithm, resulting in a high level of noise rejection.  The module estimates new values for the isolation resistance twice per second.  In the case of insulation fault, the unit identifies the relative position of the fault in relation to the battery terminals (positive, negative or anyplace in between). In addition, it measures and reports the value of capacitance from each battery terminal to chassis.

Operation Specifications

Insulation monitoring range 0 to 2.0 MW,(each of the two measurement lines to chassis)
Power supply +4.8 to +53 V (Variable, accommodating +5V to +48V power supplies)
Interface CAN 2.0B isolated,120W, termination resistor
Voltage measurement range 2 Channels: ±1000V / channel continuous, no signal clipping
Rating Automotive
Power consumption <400mW
Module operating temperature range -40℃ to +105℃,(due to connector temperature ratings)

SIM100 Product Brief

SIM100 Datasheet

ESC SIM100 Brochure

SIM100 Quick Start Guide

In this video we will be introducing kit contents of the SIM100KT and explaining how to connect the SIM100 to a system, as well as providing a test demo to demonstrate the SIM100's functionality. The Sendyne SIM100MOD is the first high voltage isolation monitoring device for EV/HEVs capable of operating correctly even when the battery is active, and experiencing large voltage variations.


About Sendyne's Technology:

How we efficiently consume, conserve and securely generate the energy we need is one of the key challenges of the 21st century.  One technology that has the potential to help meet this challenge is energy storage.  Energy storage can aid in optimization of the electric grid, enable effective integration of alternative, intermittent generation, such as wind and solar, and can empower a new generation of electric vehicles.

Large-scale storage systems are extremely complex.  Proper system management is critical; it must be able to effectively monitor, predict and control all aspects of battery system performance, including capacity, cycle life and safety.  Failure to provide such management results in underutilized (and overpriced) battery packs that require extra capacity to hedge against the unknown.  

Effective battery system management cannot be accomplished using existing technologies nor by employing traditional methods used for notebook or other smaller batteries.  Further, a multidisciplinary approach is needed, one which combines knowledge of electrochemistry, power systems, modeling, and Digitally Assisted Analog (DAA).

Sendyne® was formed in 2010 to address the challenges of battery system management through the development of breakthrough technologies.  We’ve formed a multidisciplinary team which has developed a strong intellectual property portfolio.  These technologies are focused on crucial aspects of battery system management, including accurate sensing, power delivery system design, robust, predictive modeling and more. 

Application Notes

Research Reports

Current sensing signal chain encompassed by SFP family

Current sensing signal chain encompassed by SFP family

About Sendyne's Proprietary Current Measurement IC


Sendyne SFP102 IC

Metrology-grade, bi-directional, wide dynamic range DC current measurement
IC, with precision measurement of voltage and temperature operating in the automotive temperature range of -40 °C to +125 °C.


SFP102 IC Block Diagram
  • Achieves an offset error of less than 150 nanovolts
  • Two 24-bit ΣΔ ADCs
  • Capable of interfacing sub 100 nano-ohm shunts
  • Accurate voltage measurement with flexible range
  • Accurate temperature measurement
  • Simple serial communication interface
  • Automotive temperature range of –40 °C to +125 °C
  • Low power consumption
  • “High” or “Low” side current sensing and voltage sensing reference point with isolated front end
  • Built-in calibration for current measurements
  • Built-in compensation for resistance dependence of the shunt on temperature
  • Built-in calibration for voltage measurements
  • Temperature reporting in degrees Celsius
  • Separate Charge, Discharge, and Total coulomb counters