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SLVUBT6A – October 2019 – Revised May 2020
Copyright © 2019–2020, Texas Instruments Incorporated
Using the TPS8804EVM
User's Guide
SLVUBT6A – October 2019 – Revised May 2020
Using the TPS8804EVM
1
Introduction
The TPS8804EVM is used to evaluate the TPS8804 smoke and CO detector analog front end (AFE) and
power management IC. The EVM allows for easy connection from the TPS8804 to a user-supplied
photoelectric chamber and carbon monoxide sensor. The TPS8804 GUI interfaces with the EVM to quickly
evaluate the photo amplifier, LED driver, and CO amplifier performance, and other blocks with the register
map. For a more thorough evaluation, an external microcontroller can be connected to the TPS8804EVM
to create a smoke detection system.
1.1
Applications
•
Smoke and CO detectors
1.2
Features
•
Dual LED drivers for blue and IR LEDs
•
Wide bandwidth, low offset photodiode amplifier
•
Ultra-low power CO transimpedance amplifier
•
LDOs for internal analog blocks and external microcontroller
•
Single buffered analog output AMUX for CO and photo signals
•
Serial interface for configuring amplifiers, drivers, regulators
•
SLC interface for power line communication
•
Under-voltage, over-temperature fault monitors
•
Wide input voltage range for flexible power supply configuration
1.3
Recommended Equipment
•
4.5-V to 15.5-V power supply capable of 100mA
•
USB2ANY™ interface adaptor
•
TPS880x GUI software
–
Installation files are available in the TPS8804EVM product folder
•
Multimeter for measuring regulator voltages and CO amplifier output
•
Oscilloscope for measuring photodiode signal pulse shape
2
Setup
Specific connections on the TPS8804EVM board require configuration before starting the evaluation.
2.1
Sensor Connections
TI recommends connecting a photoelectric smoke chamber and CO sensor to the TPS8804EVM for the
evaluation. The TPS8804EVM has a built-in photodiode (D7), blue LED (D8), and IR LED (D6) for
functional testing. These components can be de-soldered in order to connect a photoelectric chamber
photodiode, IR LED, and/or blue LED its place. Ensure the photodiode wires are kept short to preserve
signal integrity.
