Texas Instruments ISO1541D, User Manual, Page: 6 / 17

2 EVM Setup and Operation
This section includes the setup and operation of the EVM for parameter performance evaluation. Typical input
and output waveforms are included.
2.1 Overview
The basic setup in Figure 2-1 has the two power supplies required to evaluate isolator performance with any
combination of 3.3 V or 5 V on either side. If both sides are evaluated at the same supply voltage, only one
power supply is required and can be used to power both sides of the EVM.
CAUTION
Note that this EVM is for operating parameter performance evaluation only and not designed for
isolation voltage testing. Any voltage applied above the 5.5-V maximum recommended operating
voltage of the isolators may damage the EVM.
Please note that if the ISO1541 is used, providing an input signal on the SCL2 pin does not yield any output on
SCL1, SCL1 remains pulled up to VCC1.
J1
J2
U2
J3A/J4A
J5A/J6A
J3B/J4B
J5B/J6B
J7A/J8A
J9A/J10A
J7B/J8B
J9B/J10B
Power Supply
VCC1
Power Supply
VCC2
I C Transmitter
2
or
Oscilloscope
I C Transmitter
2
U1
Oscilloscope
or
Figure 2-1. Basic EVM Operation
2.2 Input/Output Signal Characteristics
Figure 2-2 illustrates SDA1 and SCL1 of U1 being treated as inputs and driven by an I
2
C transmitter connected
to J3A/J4A (for SDA1) and J5A/J6A (for SCL1). The output waveforms at SDA2 and SCL2 are captured on the
oscilloscope at J3B/J4B and J5B/J6B respectively. Note the step in the rising edge of the input waveforms at
SDA1 and SCL1 indicative of the tLOOP parameter of the device and demonstrating the effect of the difference
in the low levels for the side 1 output and input enabling the device to avoid a latch-up state.
EVM Setup and Operation www.ti.com
6 ISO154xEVM Low-Power Bidirectional I
2
C Isolators Evaluation Module SLLU166A – JUNE 2012 – REVISED SEPTEMBER 2022
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