Texas Instruments TPS8802EVM User manual

User’s Guide
Using the TPS8802EVM
ABSTRACT
This quick-start guide describes the operation and use of the TPS8802 evaluation module (EVM) and the
accompaning EVM graphical user interface control software.
Table of Contents
1 Introduction.............................................................................................................................................................................3
1.1 Applications........................................................................................................................................................................3
1.2 Features............................................................................................................................................................................. 3
1.3 Recommended Equipment.................................................................................................................................................3
2 Setup........................................................................................................................................................................................4
2.1 Sensor Connections...........................................................................................................................................................4
2.2 Jumper and Switch Configurations.................................................................................................................................... 4
2.3 Power Connection..............................................................................................................................................................5
2.4 USB2ANY Connection....................................................................................................................................................... 6
3 Analog Evaluation...................................................................................................................................................................8
3.1 CO AFE Evaluation............................................................................................................................................................ 9
3.2 Photo AFE Evaluation...................................................................................................................................................... 13
3.3 Power Management and Sleep Mode..............................................................................................................................19
3.4 Horn Driver Evaluation..................................................................................................................................................... 21
3.5 Register Map....................................................................................................................................................................28
4 Board Layout.........................................................................................................................................................................29
5 Schematic and Bill of Materials...........................................................................................................................................33
5.1 Schematic........................................................................................................................................................................ 33
5.2 Bill of Materials.................................................................................................................................................................34
6 Revision History................................................................................................................................................................... 36
List of Figures
Figure 2-1. Switch, Jumper, and Power Connections..................................................................................................................5
Figure 2-2. TPS880x GUI Connected to USB2ANY Adapter...................................................................................................... 6
Figure 2-3. Test Command Successful........................................................................................................................................7
Figure 3-1. Evaluation Selection Menu........................................................................................................................................8
Figure 3-2. CO Amplifier Settings................................................................................................................................................ 9
Figure 3-3. Clean Air CO Amplifier Output................................................................................................................................ 10
Figure 3-4. CO Amplifier Output with Sensor and Calibration Gas............................................................................................10
Figure 3-5. COTEST_EN Register Bit........................................................................................................................................11
Figure 3-6. CO Connectivity Test without Sensor...................................................................................................................... 12
Figure 3-7. CO Connectivity Test with Sensor........................................................................................................................... 12
Figure 3-8. Photo Amplifier Settings.......................................................................................................................................... 13
Figure 3-9. LED Power Supply Settings.................................................................................................................................... 14
Figure 3-10. LED Driver Settings...............................................................................................................................................15
Figure 3-11. EVM Photo Measurement Probe Configuration.....................................................................................................16
Figure 3-12. LED A Signals....................................................................................................................................................... 17
Figure 3-13. LED B Signals....................................................................................................................................................... 17
Figure 3-14. Photo Signal with Photo Chamber........................................................................................................................ 18
Figure 3-15. Power Management Evaluation............................................................................................................................ 19
Figure 3-16. Power Management Measurement....................................................................................................................... 19
Figure 3-17. Sleep Mode with SLP_BST = 1.............................................................................................................................20
Figure 3-18. TPS8802EVM and Three-terminal Piezo Setup....................................................................................................21
Figure 3-19. Register Map: CONFIG2 Register.........................................................................................................................22
Figure 3-20. Register Map: ENABLE2 Register........................................................................................................................ 22
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Figure 3-21. Register Map: BOOST Register............................................................................................................................ 23
Figure 3-22. EVM Three-terminal Horn Driver Measurement Probe Configuration...................................................................23
Figure 3-23. Untuned HORNSL, HORNBR, and HORNFB Waveforms.................................................................................... 24
Figure 3-24. Feedback Potentiometer....................................................................................................................................... 24
Figure 3-25. Tuned HORNSL, HORNBR, and HORNFB Waveforms........................................................................................25
Figure 3-26. TPS8802EVM and Two-terminal Piezo Setup.......................................................................................................26
Figure 3-27. Two-terminal Piezo Waveforms (HORNFB to ground).......................................................................................... 27
Figure 3-28. Two-terminal Piezo Waveforms (HORNFB to MCU)............................................................................................. 27
Figure 3-29. Register Map Search Function..............................................................................................................................28
Figure 4-1. TPS8802EVM Top Layer PCB Layout.....................................................................................................................29
Figure 4-2. TPS8802EVM Ground Layer PCB Layout.............................................................................................................. 30
Figure 4-3. TPS8802EVM Power Layer PCB Layout................................................................................................................ 31
Figure 4-4. TPS8802EVM Bottom Layer PCB Layout............................................................................................................... 32
Figure 5-1. TPS8802EVM Schematic........................................................................................................................................33
List of Tables
Table 2-1. VMCU and VBST Power-up Voltage...........................................................................................................................4
Table 5-1. Bill of Materials..........................................................................................................................................................34
Trademarks
USB2ANY™ is a trademark of Texas Instruments.
All trademarks are the property of their respective owners.
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1 Introduction
The TPS8802EVM is used to evaluate the TPS8802 smoke and CO alarm analog front end (AFE) and power
management IC. The EVM allows for easy connection from the TPS8802 to a user-supplied photoelectric
chamber and carbon monoxide sensor. The TPS8802 GUI interfaces with the EVM to quickly evaluate the
photo amplifier, LED driver, and CO amplifier performance, system power consumption, and other blocks
with the register map. For a more thorough evaluation, an external microcontroller can be connected to the
TPS8802EVM to create a smoke detection system.
1.1 Applications
• 10-year battery smoke and CO alarms
• AC powered smoke and CO alarms
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
• Default-enabled boost converter for 2-V battery operation
• Horn driver with self-resonant and PWM modes
• Interconnect driver for multi-alarm connection
• Power-saving sleep mode with wake-up interrupt
• Battery test load
• Under-voltage, over-temperature fault monitors
• Wide input voltage range for flexible power supply configuration
1.3 Recommended Equipment
• 2-V to 15.5-V power supply capable of 100 mA
• USB2ANY™ interface adaptor
• TPS880x GUI software
– Installation files are available in the TPS8802EVM product folder
• Multimeter for measuring supply current, regulator voltages and CO amplifier output
• Oscilloscope for measuring photodiode signal pulse shape
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2 Setup
Specific connections on the TPS8802EVM board require configuration before starting the evaluation.
2.1 Sensor Connections
TI recommends connecting a photoelectric smoke chamber and CO sensor to the TPS8802EVM for the
evaluation. The TPS8802EVM 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.
The CO sensor is connected to J17 screw terminals with the sensor counter terminal tied to AGND.
2.2 Jumper and Switch Configurations
The S1 switch position determines the VMCU and VBST voltage at power-up. Ensure that only one S1 sub-
switch is in the ON position. Table 2-1 displays the VMCU and VBST voltage corresponding with each S1 switch
position. For proper operation with the USB2ANY adapter, set VMCU to 3.3 V with sub-switch 4.
Table 2-1. VMCU and VBST Power-up Voltage
S1 Switch Position VMCU (V) VBST (V)
1 1.5 3
2 1.8 3
3 2.5 4
4 3.3 5
The J2 jumper connects VBST to VCC. With the J2 jumper connected and the power supply connected to VBAT,
the boost converter supplies power via VCC. This configuration allows the EVM to operate at a voltage level
from 2 V to 11.5 V1.
The J6 jumper selects the I2C device address. Connect J6 to the AGND position to set the address to 0x3F.
Connect J6 to the VMCU position to set the address to 0x2A. The GUI is compatible with both options and
defaults to 0x2A.
1The J14 shunt connecting VBAT to DINB limits the VBAT voltage to 11.5 V. If the shunt is moved to J1 connecting LEDLDO to DINB,
up to 15.5 V can be supplied on VBAT.
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Figure 2-1. Switch, Jumper, and Power Connections
2.3 Power Connection
Connect the power supply to VBAT and PGND. Set the power supply to 2 V, 100 mA2. Enable the power supply
and measure the voltage on VMCU (TP27) to ensure it is operating at the voltage option selected by S1:
• 1.5 V
• 1.8 V
• 2.5 V
• 3.3 V
Measure the voltage on VBST to ensure it is either 3 V, 4 V, or 5 V. See Table 2-1 for more information on the
initial VMCU and VBST voltage.
2Peak current drawn from the supply is 600 mA for boost converter operation. If device does not power up with 100 mA current limit,
increase the power supply current limit to 600 mA.
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2.4 USB2ANY Connection
Use a USB cable to connect the USB2ANY adapter to a computer with the TPS880x GUI installed. Open
the TPS880x GUI and verify the USB2ANY adapter is recognized (see Figure 2-2). With the EVM powered,
connect the USB2ANY adapter to the EVM using the USB2ANY adapter 10-pin ribbon cable. Click EXPLORE
TPS8802EVM then QUICK START and select the device address corresponding to the J6 jumper (see Section
2.2). Send the test command to verify the EVM, USB2ANY adapter, and GUI software are all connected.
Figure 2-2. TPS880x GUI Connected to USB2ANY Adapter
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Figure 2-3. Test Command Successful
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3 Analog Evaluation
Click START EVALUATION and select the feature to evaluate. The Analog Front End section guides the CO
AFE and photo AFE evaluation, and the Power Saving Mode section guides the standby power consumption
and sleep mode evaluation. Enter the register map to evaluate the other blocks in the TPS8802 device.
Figure 3-1. Evaluation Selection Menu
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3.1 CO AFE Evaluation
If a CO sensor is available, connect it to the J17 terminal block. Select the feedback resistance and reference
voltage in the GUI software. The TPS8802EVM default configuration uses the internal resistors and references.
To use an external feedback resistor, solder a resistor to R5. To use an external input resistor, replace the
R1 0-Ω resistor with the required input resistance. The output resistor filters the CO amplifier output when a
capacitor is installed on C3.
Set the AMUX SELECTION to CO AMPLIFIER. Enable the CO amplifier and measure the voltage on
AMUX_BUF.
Figure 3-2. CO Amplifier Settings
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Figure 3-3. Clean Air CO Amplifier Output
Figure 3-4. CO Amplifier Output with Sensor and Calibration Gas
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3.1.1 CO Connectivity Test
A simple test confirms that the CO sensor is connected to the EVM. Remove the shunt connected to J7 and
connect a shunt to J15 and J16. Write COTEST_EN = 1 and measure the pulse shape on AMUX_BUF using
an oscilloscope. When COTEST_EN = 1, the PREF pin is pulled low and injects charge into the CO sensor and
amplifier. The AMUX pulse shape is different if the CO sensor is disconnected. Write COTEST_EN = 0, remove
the J15 and J16 shunts, and connect the J7 shunt when finished.
Figure 3-5. COTEST_EN Register Bit
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Figure 3-6. CO Connectivity Test without Sensor
Figure 3-7. CO Connectivity Test with Sensor
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3.2 Photo AFE Evaluation
Connect the photoelectric chamber to the EVM. If a photoelectric chamber is not available, place a box over the
EVM to block ambient light and reflect the EVM LED light into the photodiode when testing the photo AFE.
Enable the photo amplifier, photo gain amplifier, and set the AMUX SELECTION to PHOTO GAIN AMPLIFIER.
Select the photo reference on the EVM with jumper J7 and enable the photo reference voltage if the reference is
set to PREF. Set the gain factor to the required value. If no extra gain is required, set the AMUX SELECTION to
PHOTO AMPLIFIER.
It is recommended to install a 470 kΩ resistor connecting PREF to VINT if the photo gain is set to 11x, 20x, or
35x. The 470 kΩ resistor changes the PREF voltage to 70mV and prevents the gain stage output from dropping
below 50 mV in worst-case conditions.
Figure 3-8. Photo Amplifier Settings
Configure the power to the LEDs. By default, LED A is connected to LEDLDO and LED B is connected to VBAT.
Use the J1, J5, J8, and J14 jumpers to select which supply powers each LED. Enable the LEDLDO if it powers
either LED.
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Figure 3-9. LED Power Supply Settings
Configure the PWM pulse settings for the LED driver. The default setting 201 ms pulse rate and 1 ms pulse width
sufficiently tests the LED driver. This setting controls the PWM signal from the USB2ANY adapter to the EVM.
Configure the LED current for each driver. The default EVM CSA resistance is 10 Ω and the default EVM CSB
resistance is 1.3 Ω. These resistors can be switched on the EVM to change the LED current and temperature
compensation. Set the DAC voltage to fine tune the LED current. Set the temperature coefficient to the required
setting. Click SETUP TEST after configuring the photo amplifier, LED power supply, and LED driver.
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Figure 3-10. LED Driver Settings
Select the LED to be tested. Enable the LED PWM to send the PWM signal to the LEDEN pin. Enable
LEDPIN_EN to control the LED driver using the LEDEN pin. Place a box over the EVM if the EVM LEDs and
photodiode are used to block ambient light and reflect the LED light into the photodiode.
Use an oscilloscope to measure the LED current, photo input amplifier, and photo gain amplifier signals. Probe
LEDEN to measure the LED control signal. Probe CSA or CSB to measure the LED driver current. Probe PDO to
measure the photo input stage amplifier. Probe AMUX_BUF to measure the photo gain stage amplifier.
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Figure 3-11. EVM Photo Measurement Probe Configuration
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Figure 3-12. LED A Signals
Figure 3-13. LED B Signals
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Figure 3-14. Photo Signal with Photo Chamber
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3.3 Power Management and Sleep Mode
3.3.1 Power Management
The power management evaluation page allows the user to conveniently control many blocks that are critical for
system power consumption. Use the interface to enable and disable each block. Connect a multimeter in series
with the power supply to measure current. Remove the J4 USB2ANY adapter cable when performing critical
measurements. Raise the VBAT voltage above VINT and VMCU if the boost converter is disabled. In Figure
3-16, the VBAT voltage is raised to 3.6 V to maintain regulation of the MCULDO.
Figure 3-15. Power Management Evaluation
Figure 3-16. Power Management Measurement
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3.3.2 Sleep Mode
Sleep mode disables blocks for a programmable amount of time and flags the MCU when sleep mode is exited.
Enter the required amount of sleep time via the GUI and click ENTER to start the sleep timer. Click EXIT to exit
sleep mode if the device is in sleep mode. Probe the GPIO pin to measure the interrupt signal that occurs when
the sleep timer finishes.
CLEAR INTERRUPT resets the interrupt signal. The interrupt signal is reset whenever the STATUS1 register
is read. By default, the GUI reads all registers every 5 seconds. Disable the automatic register reading by
navigating to the Register Map page and changing the Auto Read setting to Off.
Figure 3-17. Sleep Mode with SLP_BST = 1
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