Introduction
2
SLVUB32 – March 2017
Copyright © 2017, Texas Instruments Incorporated
TCA9802 I
2
C Buffer Evaluation Module
1
Introduction
The TCA9802EVM allows designers to evaluate and compare device performance to enable fast selection
of I
2
C buffers and translators for their system. The TCA9802EVM contains the TCA9802 along with a
linear regulator,
, and I
2
C temperature sensors,
. There are other buffers that can be
ordered as samples but are not loaded with the EVM (TCA9800, TCA9801, TCA9803, or TCA9517A).
This allows the designer to evaluate the entire family of devices along with competitor solutions.
1.1
Overview
The TCA9802 is a dual-channel bidirectional buffer intended for I
2
C bus and SMBus or PMBus systems. It
provides bidirectional level shifting (up-translation and down-translation) between low voltages (down to
0.8 V) and higher voltages (1.65 V to 3.6 V). The TCA9802 features an internal current source on the B-
side of the device, allowing the removal of external pull-up resistors on the B-side. The current source also
provides an improved rise time and ultra-low power consumption.
1.2
EVM Features
This EVM has the following features:
•
V
CCA
input voltage range: 0.8 V to 3.6 V
•
V
CCB
input voltage range: 1.65 V to 3.6 V
•
Access to the V
CCA
, V
CCB
, OE, SDAA, SCLA, SDAB, and SCLB pins
•
Onboard slave device,
, that is programmed using jumpers
•
Onboard V
CCB
regulator,
, that is programmed using a jumper
•
Dual layout to allow for evaluating and comparing competitors or other TCA980x family of devices
•
Footprints to test various capacitive loads and series inductance to emulate real-world parasitic affects
2
EVM Hardware Block Diagram and Images
The TCA9802EVM is an evaluation module for the Texas Instruments TCA9802 and TCA980x family of
I
2
C buffers. It provides basic functionality evaluation for the device.
illustrates the EVM schematic.
