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Analog Evaluation

7

SLVUBT6A – October 2019 – Revised May 2020

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Copyright © 2019–2020, Texas Instruments Incorporated

Using the TPS8804EVM

Figure 5. CO Amplifier Settings

Figure 6. Clean Air CO Amplifier Output

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Содержание TPS8804

Страница 1: ...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 commu...

Страница 2: ...the ON position Table 1 displays the VMCU 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 1 VMCU Power up Vol...

Страница 3: ...4EVM Figure 1 Switch Jumper and Power Connections 2 3 Power Connection Connect the power supply to VCC and PGND Set the power supply to 5 V 100 mA Enable the power supply and measure the voltage on VM...

Страница 4: ...GUI installed Open the TPS880x GUI and verify the USB2ANY adapter is recognized see Figure 2 With the EVM powered connect the USB2ANY adapter to the EVM using the USB2ANY adapter 10 pin ribbon cable...

Страница 5: ...2020 Texas Instruments Incorporated Using the TPS8804EVM Figure 3 Test Command Successful 3 Analog Evaluation Click START EVALUATION and select the feature to evaluate The Analog Front End section gu...

Страница 6: ...elect the feedback resistance and reference voltage in the GUI software The TPS8804EVM default configuration uses the internal resistors and references To use an external feedback resistor solder a re...

Страница 7: ...luation 7 SLVUBT6A October 2019 Revised May 2020 Submit Documentation Feedback Copyright 2019 2020 Texas Instruments Incorporated Using the TPS8804EVM Figure 5 CO Amplifier Settings Figure 6 Clean Air...

Страница 8: ...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 o...

Страница 9: ...w ti com Analog Evaluation 9 SLVUBT6A October 2019 Revised May 2020 Submit Documentation Feedback Copyright 2019 2020 Texas Instruments Incorporated Using the TPS8804EVM Figure 8 COTEST_EN Register Bi...

Страница 10: ...aluation www ti com 10 SLVUBT6A October 2019 Revised May 2020 Submit Documentation Feedback Copyright 2019 2020 Texas Instruments Incorporated Using the TPS8804EVM Figure 9 CO Connectivity Test withou...

Страница 11: ...todiode 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 th...

Страница 12: ...opyright 2019 2020 Texas Instruments Incorporated Using the TPS8804EVM Figure 11 Photo Amplifier Settings Configure the power to the LEDs By default LED A and LED B are connected to LEDLDO Use the J1...

Страница 13: ...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 and the defau...

Страница 14: ...EDPIN_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 osci...

Страница 15: ...nalog Evaluation 15 SLVUBT6A October 2019 Revised May 2020 Submit Documentation Feedback Copyright 2019 2020 Texas Instruments Incorporated Using the TPS8804EVM Figure 14 EVM Photo Measurement Probe C...

Страница 16: ...Analog Evaluation www ti com 16 SLVUBT6A October 2019 Revised May 2020 Submit Documentation Feedback Copyright 2019 2020 Texas Instruments Incorporated Using the TPS8804EVM Figure 15 LED A Signals...

Страница 17: ...www ti com Analog Evaluation 17 SLVUBT6A October 2019 Revised May 2020 Submit Documentation Feedback Copyright 2019 2020 Texas Instruments Incorporated Using the TPS8804EVM Figure 16 LED B Signals...

Страница 18: ...S8804EVM Figure 17 Photo Signal with Photo Chamber 3 3 Register Map Use the register map to evaluate other blocks in the TPS8804 Use the search to find register bits that correspond to a certain block...

Страница 19: ...com Analog Evaluation 19 SLVUBT6A October 2019 Revised May 2020 Submit Documentation Feedback Copyright 2019 2020 Texas Instruments Incorporated Using the TPS8804EVM Figure 18 Register Map Search Fun...

Страница 20: ...www ti com 20 SLVUBT6A October 2019 Revised May 2020 Submit Documentation Feedback Copyright 2019 2020 Texas Instruments Incorporated Using the TPS8804EVM 4 Board Layout Figure 19 TPS8804EVM Top Laye...

Страница 21: ...com Board Layout 21 SLVUBT6A October 2019 Revised May 2020 Submit Documentation Feedback Copyright 2019 2020 Texas Instruments Incorporated Using the TPS8804EVM Figure 20 TPS8804EVM Ground Layer PCB...

Страница 22: ...Layout www ti com 22 SLVUBT6A October 2019 Revised May 2020 Submit Documentation Feedback Copyright 2019 2020 Texas Instruments Incorporated Using the TPS8804EVM Figure 21 TPS8804EVM Power Layer PCB L...

Страница 23: ...com Board Layout 23 SLVUBT6A October 2019 Revised May 2020 Submit Documentation Feedback Copyright 2019 2020 Texas Instruments Incorporated Using the TPS8804EVM Figure 22 TPS8804EVM Bottom Layer PCB...

Страница 24: ...V in worst case conditions Figure 23 TPS8804EVM Schematic 5 2 Bill of Materials Table 2 Bill of Materials REF DES QTY VALUE DESCRIPTION SIZE PART NUMBER PCB1 1 Printed Circuit Board TPS880x C1 C11 2 4...

Страница 25: ...22284023 J4 1 Header shrouded 100mil 5 2 Gold TH 5 2 Shrouded header 5103308 1 J17 1 Terminal Block 5 08 mm 2 1 TH Terminal Block 5 08 mm 2 1 TH 039544 3002 LBL1 1 Thermal Transfer Printable Labels 0...

Страница 26: ...MBER SH J1 SH J2 SH J3 SH J4 SH J7 SH J8 6 1 2 Shunt 100mil Flash Gold Black Closed Top 100mil Shunt SPC02SYAN TP1 TP3 TP4 TP7 TP8 TP10 TP12 TP13 TP14 TP15 TP16 TP17 TP20 TP21 TP22 TP23 TP24 TP25 TP26...

Страница 27: ...dded Figure 7 8 Added recommendation to install a 470 k resistor connecting PREF to VINT in Section 3 2 11 Updated silkscreen labels in Figure 19 21 Added Figure 20 22 Added Figure 21 23 Updated PCB r...

Страница 28: ...e resources are subject to change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reprod...

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