Texas Instruments TPS3813 Q1EVM Series Manuale utente

SPRUI96–October 2016

TPS3813xxxQ1EVM for Processor Voltage Supervisor With Window-

Watchdog User’s Guide

User's Guide

SPRUI96–October 2016

TPS3813xxxQ1EVM for Processor Voltage Supervisor

With Window-Watchdog User’s Guide

This user’s guide describes the TPS3813xxxQ1EVM evaluation module (EVM). This guide contains the

EVM schematic, bill of materials (BOM), assembly drawing, and top and bottom board layouts.

Contents

1 Introduction ................................................................................................................... 2

2 Setup and Operation ........................................................................................................ 6

3 EVM Setup.................................................................................................................... 7

List of Figures

1 TPS3813xxxQ1EVM Board ................................................................................................ 2

2 TPS3813xxxQ1EVM Schematic........................................................................................... 3

3 Composite - Top View ...................................................................................................... 5

4 Layout Top View............................................................................................................. 5

5 Layout Bottom View ........................................................................................................ 5

6 Top Layer..................................................................................................................... 5

7 Bottom Layer................................................................................................................. 5

8 Top Solder Mask............................................................................................................. 5

9 Delay Time TPS3813K33-Q1 .............................................................................................. 8

10 Delay Time TPS3813I50-Q1 ............................................................................................... 8

11 Rise Time TPS3813K33-Q1................................................................................................ 8

12 Rise Time TPS3813I50-Q1................................................................................................. 8

13 Fall Time TPS3813K33-Q1................................................................................................. 9

14 Fall Time TPS3813I50-Q1.................................................................................................. 9

15 TPS3813K33-Q1 ........................................................................................................... 10

16 TPS3813I50-Q1 ............................................................................................................ 10

17 Watchdog Window Boundary Violation TPS3813K33-Q1 ............................................................ 10

List of Tables

1 TPS3813xxxQ1EVM BOM ................................................................................................. 4

2 Test Points.................................................................................................................... 6

3 EVM Onboard Jumpers..................................................................................................... 7

4 EVM Electrical Characteristics............................................................................................. 7

5 Jumper Settings.............................................................................................................. 8

6 Jumper Settings.............................................................................................................. 9

Introduction

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TPS3813xxxQ1EVM for Processor Voltage Supervisor With Window-

Watchdog User’s Guide

Trademarks

1 Introduction

The TPS3813xxxQ1EVM is an evaluation module (EVM) for processor voltage supervisors with window-

watchdog provided by Texas Instruments. The EVM has an operating voltage range of approximately 2 V

to 6 V, and has added jumpers to tie the FAULT pin to the voltage it is supervising, as well as several

jumpers to control timing of the window-watchdog. Both 3.3 V and 5.0 V VDD devices are broken out

separately on the board, except for a common ground connection. Provided test points give users access

to multiple ground points and all critical node voltages.

The top-side of the EVM board accepts two voltage supervisors in a SOT23-6 package. These devices

have an input for supply voltage (VDD), a watchdog rising edge input, and a reset output to monitor that VDD

does not drop below the threshold voltage, VIT, and monitor the watchdog timing conditions.

Figure 1. TPS3813xxxQ1EVM Board

1.1 Related Documentation

The TPS3813-Q1 Processor Supervisory Circuits With Window-Watchdog datasheet (SPRS288)

1.2 TPS3813-Q1 Applications

The features of this EVM are as follows:

• Supply Monitoring for DSPs, Microcontrollers, or Microprocessors

• Safety – Critical Systems

• Automotive Systems

1.3 Schematics, Bill of Materials, and Layout

This section contains the TPS3813xxxQ1EVM schematic, bill of materials (BOM), and layout.

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Introduction

SPRUI96–October 2016

TPS3813xxxQ1EVM for Processor Voltage Supervisor With Window-Watchdog

User’s Guide

1.3.1 EVM Schematic

Figure 2. TPS3813xxxQ1EVM Schematic

1.3.2 EVM Bill of Materials

Table 1 lists the bill of materials (BOM) for the TPS3813xxxQ1EVM.

Introduction

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User’s Guide

Table 1. TPS3813xxxQ1EVM BOM

Designator Quantity Value Description Package Reference Part Number Manufacturer

!PCB1 1 Printed Circuit Board MSA017 Any

C1, C3 2 0.1uF CAP, CERM, 0.1 µF, 50 V, ±10%, X7R, AEC-

Q200 Grade 1, 0603 0603 CGA3E2X7R1H104K0

80AA TDK

C2, C4 2 3300pF CAP, CERM, 3300 pF, 50 V, ±10%, X7R,

AEC-Q200 Grade 1, 0402 0402 CGA2B2X7R1H332K0

50BA TDK

J1, J4, J5, J8 4 Header, 2.54 mm, 2x1, Gold, R/A, SMT Header, 2.54 mm, 2 x1, R/A,

SMT 87898-0204 Molex

J2, J3, J6, J7 4 Header, 100 mil, 3x1, Gold, SMT Samtec_TSM-103-01-X-SV TSM-103-01-L-SV Samtec

R1, R2 2 100k RES, 100 k, 1%, 0.1 W, 0603 0603 CRCW0603100KFKE

AVishay-Dale

SH-J1, SH-J2, SH-J5, SH-J6 4 1x2 Shunt, 100mil, Flash Gold, Black Closed Top 100mil Shunt SPC02SYAN Sullins Connector

Solutions

TP1, TP2, TP3, TP4, TP5,

TP6, TP7, TP8, TP9, TP10,

TP11, TP12, TP13, TP14,

TP15, TP16

16 Test Point, Compact, SMT Testpoint_Keystone_Compact 5016 Keystone

U1 1 Processor Supervisory Circuits With Window-

Watchdog, DBV0006A DBV0006A TPS3813K33QDBVR

Q1 Texas Instruments

U2 1 Processor Supervisory Circuits With Window-

Watchdog, DBV0006A DBV0006A TPS3813I50QDBVRQ

1Texas Instruments

FID1, FID2, FID3 0 Fiducial mark. There is nothing to buy or

mount. Fiducial N/A N/A

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Introduction

SPRUI96–October 2016

TPS3813xxxQ1EVM for Processor Voltage Supervisor With Window-

Watchdog User’s Guide

1.3.3 Layout and Component Placement

Figure 3 is the top assembly of the printed circuit board (PCB), which shows the component placement on

the EVM. Figure 4 is the Layout Top View and Figure 5 is the Layout Bottom View, Figure 6 and Figure 7

show the top and bottom layers, and Figure 8 shows the top solder mask of the EVM.

Figure 3. Composite - Top View Figure 4. Layout Top View

Figure 5. Layout Bottom View Figure 6. Top Layer

Figure 7. Bottom Layer Figure 8. Top Solder Mask

Setup and Operation

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TPS3813xxxQ1EVM for Processor Voltage Supervisor With Window-

Watchdog User’s Guide

2 Setup and Operation

This section describes the connectors, jumpers, and test points on the EVM as well as how to connect, set

up, and properly use the EVM. This section also includes an example of EVM operation.

2.1 Connector Descriptions

There are several methods and types of I/O connections on the EVM including:

• Test Points: for reset, WDR, WDT, WDI, VDD, and GND connected pins

• Two-Pin Jumpers: for holding the RESETN pin at a different voltage than VDD and for using an optional

external capacitor to adjust the watchdog window

• Three-Pin Jumpers: for manually setting WDT and WDR to VDD, GND, or for using an external

capacitor for a programmable window

Table 2 lists the test points and functional descriptions. All pins of the device are broken out to test points

on the EVM.

Table 2. Test Points

Test Point

Number Device Test Point

Silkscreen Label Function Description

TP1 TPS3813K33 VDD Voltage Input Supply Voltage/ Voltage Supervisor

Input

TP2 TPS3813K33 VDD1 Voltage Monitoring/ Probing Voltage Probe Point for TPW3813

TP3 TPS3813K33 RESETN Voltage Monitoring/ Probing Active Low Reset Output

TP4 TPS3813K33 GND Voltage Input Supply Ground Connection

TP5 TPS3813K33 WDR1 Voltage Monitoring/ Probing Watchdog Ratio Input (VDD or GND)

TP6 TPS3813K33 WDT1 Voltage Monitoring/ Probing Watchdog Delay Input (VDD, GND,

or Cext)

TP7 TPS3813K33 WDI1 Voltage Monitoring/ Probing Watchdog Input Pin

TP8 Both GND Voltage Monitoring/ Probing Common Ground Connection

TP9 Both GND Voltage Monitoring/ Probing Common Ground Connection

TP10 TPS3813I50 VDD Voltage Input Supply Voltage/ Voltage Supervisor

Input

TP11 TPS3813I50 VDD2 Voltage Monitoring/ Probing Supply Voltage/ Voltage Supervisor

Input

TP12 TPS3813I50 RESETN Voltage Monitoring/ Probing Active Low Reset Output

TP13 TPS3813I50 GND Voltage Input Supply Ground Connection

TP14 TPS3813I50 WDR2 Voltage Monitoring/ Probing Watchdog Ratio Input (VDD or GND)

TP15 TPS3813I50 WDT2 Voltage Monitoring/ Probing Watchdog Delay Input (VDD, GND,

or Cext)

TP16 TPS3813I50 WDI2 Voltage Monitoring/ Probing Watch-Dog Input Pin

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EVM Setup

SPRUI96–October 2016

TPS3813xxxQ1EVM for Processor Voltage Supervisor With Window-

Watchdog User’s Guide

The descriptions for the jumpers onboard the TPS3813xxQ1EVM are in Table 3. The three pin jumpers

control the two settings of the WDR pin, and two of the three settings of the WDT pin. The two pin jumpers

are for the option of pulling the RESETN pin up to VDD and for pulling the WDT pin to GND. The RESETN

pin is an open drain, so it needs to be pulled high to assert an active low output. The WDT and WDR pins

control the length of the programmable watchdog window and the length of the lower boundary prior to the

watchdog window. The capacitor onboard the EVM is set to give a midpoint between the smallest and

largest settings of this window. A Window Watchdog Calculator is provided for sizing the programmable

watchdog window, use the link to go to the folder to download. For more information regarding the

operation and functionality of the window-watchdog feature, refer to the TPS3813-Q1 datasheet.

Table 3. EVM Onboard Jumpers

Jumper Device Setting (On, VDD,

GND, or C2) Description

J1 TPS3813K33 On Pulls RESET pin to supply voltage VDD.

J4 TPS3813K33 On Pulls the WDT pin low, lowest lower window

boundary and window.

J5 TPS3813I50 On Pulls RESET pin to supply voltage VDD.

J8 TPS3813I50 On Pulls the WDT pin low, lowest lower window

boundary and window.

J2 TPS3813K33 GND Pulls the WDR pin low, smaller lower window

boundary and window.

VDD Pulls the WDR pin high, larger lower window

boundary and window.

J3 TPS3813K33 Cext Applies external capacitor to the WDT pin for

programmable window.

VDD Pulls WDT pin high, largest lower window

boundaries and frames.

J6 TPS3813I50 GND Pulls the WDR pin low, smaller lower window

boundary and window.

VDD Pulls the WDR pin high, larger lower window

boundary and window.

J7 TPS3813I50 Cext Applies external capacitor to the WDT pin for

programmable window.

VDD Pulls WDT pin high, largest lower window

boundary and window.

Table 4 includes abridged EVM electrical characteristics. For a full functional description of the TPS3813-

Q1 device, refer to the TPS3813-Q1 datasheet.

Table 4. EVM Electrical Characteristics

PARAMETER CONDITION DEVICE MIN TYP MAX UNIT

Supply Voltage, VDD J2 Both 2 — 6 V

Negative-going input threshold

voltage, VIT J2 TPS3813K33 2.87 2.93 3 V

TPS3813I50 4.45 4.55 4.65 V

3 EVM Setup

The EVM setup section details what test equipment the user needs to evaluate the EVM and how to

properly setup the EVM environment. The user should read the TPS3813Q1 Datasheet before using the

EVM.

EVM Setup

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TPS3813xxxQ1EVM for Processor Voltage Supervisor With Window-

Watchdog User’s Guide

3.1 Recommended Test Equipment

The following is the recommended test equipment:

• Two-channel storage oscilloscope

• Current probe

• Voltage probe

• Adjustable DC power supply with at least 2.5-V to 6.5-V output and 10-A current limit

• Digital Multimeter or Volt-Ohmmeter

• A passive or active load capable of handling up to 3 A

3.2 Measuring Delay Time and Rise/Fall Time

An internal clock delays the return of the output to the inactive (high) state to ensure proper system reset.

The delay time, td= 25 ms typical, begins after the VDD1 voltage rises above the threshold voltage (VIT)

as specified in the TPS3813-Q1 datasheet. To perform this test, the user must set the jumpers according

to Jumper Settings, Table 5. A stable 5-V DC supply must also be readily available.

Table 5. Jumper Settings

Jumper Setting

J1 to J5 VDD1

J2 to J6 VDD1

J3 to J7 VDD1

J4 to J8 OFF

The jumper settings previously described will pull the WDT and WDR pin up to VDD, setting the Watchdog

window to a default with window frame minimum of 15.6 ms and maximum of 3000 ms. Figure 9 through

Figure 14 display the delay time as well for the rise and fall time of the RESETN pin when the VDD

voltage falls above or below the negative going threshold voltage as outlined in the EVM Electrical

Characteristics, Table 4.

Figure 9. Delay Time TPS3813K33-Q1 Figure 10. Delay Time TPS3813I50-Q1

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EVM Setup

SPRUI96–October 2016

TPS3813xxxQ1EVM for Processor Voltage Supervisor With Window-

Watchdog User’s Guide

Figure 11. Rise Time TPS3813K33-Q1 Figure 12. Rise Time TPS3813I50-Q1

Figure 13. Fall Time TPS3813K33-Q1 Figure 14. Fall Time TPS3813I50-Q1

3.3 Programming Watchdog Timer

The TPS3813-Q1EVM allows users to program the watchdog window using the WDT and WDR pins with

several different configurations to set the window timeout and ratio, which are explained in the

Implemented Window-Watchdog Settings section of the TPS3813Q1 datasheet. On board the EVM, the

WDT pin can be connected to ground through the C2 capacitor using the J4 and J6 jumpers to set the

upper boundary of the watchdog window. Jumpers must be set as in Table 6.

Table 6. Jumper Settings

Jumper Setting

J1 to J5 VDD1

J2 to J6 VDDI

J3 to J7 C2

J4 to J8 ON

Revision History

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Revision History

If the device does not detect a rising edge at the WDI pin, it will reset delay approximately 25 ms and

return back to normal operation. This behavior is shown in Figure 15 and Figure 16.

Figure 15. TPS3813K33-Q1 Figure 16. TPS3813I50-Q1

The watchdog window settings can be calculated and verified using the Window Watchdog Calculator and

Visualizer tool as seen in Figure 17. Therefore, by using the jumpers as outlined above in Table 6 the

WDT pin is tied to ground through a 3300-pF capacitor. The former results in a watchdog window with

limits of tboundary,max = 35 ms and twindow, min = 895.3 ms. Once the window has been configured, the watchdog

timer should re-trigger to use the Watchdog Timer Input (WDI) pin with an external signal that fits within

the watchdog window to avoid a timeout and RESETN pin is asserted. Care must be taken to avoid a

boundary violation, which results from a trigger pulse in the lower or upper boundary of the watchdog

window. Figure 17 shows a boundary violation that causes the RESETN pin to pull low. The WDI pulse

seen at the falling edge of RESETN triggers at the lower boundary. Therefore, the user must adjust the

pulse signal properly.

Figure 17. Watchdog Window Boundary Violation TPS3813K33-Q1

Revision History

DATE REVISION NOTES

November 2016 * Initial Release

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