1 Introduction
This user's guide presents a typical laboratory setup used with this EVM.
CAUTION
This Evaluation Module (EVM) is made available for isolator parameter performance evaluation only
and is not intended for isolation voltage testing. Do not use this EVM for isolation voltage tests
even though the I
2
C devices have galvanic isolation protection. To prevent damage to the EVM,
any voltage applied as a supply or digital input/output must be maintained within the 0 V to 5.5 V
recommended operating range.
Exceeding the specified input voltage range and applying loads outside the specified output range may cause
unexpected operation and irreversible damage to the EVM. If there is uncertainty as to the input voltage range
or load specification, please contact a TI field representative or create a post on
prior to connecting
power.
2 Overview
The ISO164x family of devices are low-power, bidirectional isolators that are compatible with I
2
C interfaces
and GPIO signals. The logic input and output buffers on these devices are separated by TI’s
Capacitive
Isolation
technology utilizing a silicon dioxide (SiO2) barrier. Devices with a
B
suffix are 3-kV
RMS
basic isolated
transceivers while devices without a
B
suffix are 5-kV
RMS
reinforced isolated devices. When used with isolated
power supplies, these devices block high voltages, isolate different grounds, and prevent noise currents from
entering isolated grounds and interfering with or damaging sensitive circuitry.
ISO1642, ISO1643, and ISO1644 devices have two bidirectional data channels for I
2
C clock and data lines
and are fit for multi-master or clock-stretching applications. These devices achieve isolated bidirectional
communication by introducing a static voltage offset (SVO), making the side 1 low-level output greater than
the side 1 low-level input, thus preventing an internal logic latch that otherwise would occur with standard digital
isolators.
Use this EVM to evaluate different signal and electrical parameters of the ISO1642, ISO1643, and ISO1644
devices. Apply test signals and sequences to the device channels to evaluate performance characteristics such
as propagation delay, rise and fall times, and power consumption for different device conditions. Users can
evaluate these parameters in their own lab environment.
This EVM can support evaluation of ISO1642, ISO1643, and ISO1644 devices in their 16-pinDW packages by
de-soldering the included IC and soldering on a replacement component. If this is done by the user, please note
that although the SDA and SCL channels are in the same pin positions across these devices, the number of
GPIO channels and their direction configuration is different for each, as shown in
Note
Although the IC landing pattern on this EVM is the same as other isolator devices, other 16-pinDW
devices may have different pin configurations than the ISO1642, ISO1643, or ISO1644.
Do not
install
other 16-pinDW devices.
Introduction
2
ISO1644DWEVM Reinforced Isolated I
2
C With GPIOs Evaluation Module
SLLU329 – JUNE 2021
Copyright © 2021 Texas Instruments Incorporated
