User’s Guide
TPS3840EVM Voltage Supervisor User Guide
ABSTRACT
This user’s guide describes the TPS3840EVM evaluation module (EVM). This guide contains the EVM
schematic, bill of materials (BOM), assembly drawing, and top and bottom board layouts.
Table of Contents
1 Trademarks..............................................................................................................................................................................1
2 Introduction.............................................................................................................................................................................2
2.1 Related Documentation......................................................................................................................................................3
2.2 TPS3840 Applications........................................................................................................................................................3
3 Schematic, Bill of Materials, and Layout.............................................................................................................................. 4
3.1 TPS3840EVM Schematic...................................................................................................................................................5
3.2 TPS3840EVM Bill of Materials........................................................................................................................................... 6
3.3 Layout and Component Placement....................................................................................................................................7
4 EVM Connectors..................................................................................................................................................................... 9
4.1 EVM Test Points.................................................................................................................................................................9
4.2 EVM Jumpers.....................................................................................................................................................................9
5 EVM Setup and Operation....................................................................................................................................................10
5.1 Input Power (VDD)............................................................................................................................................................ 10
5.2 Monitoring Voltage on VDD..............................................................................................................................................10
5.3 Reset Output ( RESET )...................................................................................................................................................11
5.4 Reset Time Delay Programming (program tD via CT)...................................................................................................... 11
6 Revision History................................................................................................................................................................... 12
List of Figures
Figure 2-1. TPS3840EVM Board Top.......................................................................................................................................... 2
Figure 2-2. TPS3840EVM Board Bottom.....................................................................................................................................3
Figure 3-1. TPS3840EVM Schematic..........................................................................................................................................5
Figure 3-2. Component Placement—Top Assembly....................................................................................................................7
Figure 3-3. Component Placement—Bottom Assembly.............................................................................................................. 7
Figure 3-4. Layout—Top.............................................................................................................................................................. 7
Figure 3-5. Layout—Bottom.........................................................................................................................................................7
Figure 3-6. Top Layer...................................................................................................................................................................8
Figure 3-7. Bottom Layer............................................................................................................................................................. 8
Figure 3-8. Top Solder Mask........................................................................................................................................................8
Figure 5-1. TPS3840EVM RESET Asserted Due to MR Pulled Low.........................................................................................10
Figure 5-2. TPS3840EVM RESET Deasserted Due to MR Pulled High, With Delay tD, CT Floating........................................ 10
Figure 5-3. TPS3840EVM Startup Delay Time (tSTRT) with VDD = 1.6 V and CT Floating........................................................ 11
Figure 5-4. TPS3840EVM Glitch Immunity................................................................................................................................ 11
Figure 5-5. TPS3840EVM RESET Delay Time (tD) with CT Tied to GND Through 1-µF Capacitor.......................................... 12
Figure 5-6. TPS3840EVM RESET Delay Time (tD) with CT Tied to GND Through 0.01-µF Capacitor..................................... 12
Figure 5-7. TPS3840EVM RESET Delay Time (tD) with CT Floating.........................................................................................12
List of Tables
Table 3-1. BOM............................................................................................................................................................................6
Table 4-1. Test Points.................................................................................................................................................................. 9
Table 4-2. List of Onboard Jumpers.............................................................................................................................................9
Table 5-1. Nominal Supply and Typical Threshold Voltages......................................................................................................10
1 Trademarks
All trademarks are the property of their respective owners.
www.ti.com Table of Contents
SNVU611A – DECEMBER 2018 – REVISED MAY 2021
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