Texas Instruments TPS65381EVM User manual

TPS65381EVM User's Guide

User's Guide

Literature Number: SLVU847

April 2013

Contents

1 Introduction ........................................................................................................................ 4

2 Background ........................................................................................................................ 5

3 Setup ................................................................................................................................. 6

3.1 I/O Connector Description ................................................................................................. 6

3.2 Supply ........................................................................................................................ 7

3.3 Jumper Setting .............................................................................................................. 7

3.4 Test Points ................................................................................................................... 8

3.5 VDD6 Voltage Regulator ................................................................................................... 8

3.6 VDD1 Voltage Regulator ................................................................................................... 8

3.7 VDD3/5 Voltage Regulator ................................................................................................. 8

3.8 VDD5 Voltage Regulator ................................................................................................... 9

3.9 VSOUT1 Voltage Regulator ............................................................................................... 9

4 TIGER GUI Software ........................................................................................................... 10

5 Go into ACTIVE Mode - Step by Step Description .................................................................. 11

6 EVM Schematic ................................................................................................................. 14

7 Board Picture .................................................................................................................... 15

7.1 Top .......................................................................................................................... 15

7.2 Bottom ...................................................................................................................... 16

8 Board Assembly ................................................................................................................ 17

9 Board Layout .................................................................................................................... 19

10 Bill of Material ................................................................................................................... 21

2Contents SLVU847–April 2013

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List of Figures

5-1. WD Timing.................................................................................................................. 11

5-2. Start-Up Screen............................................................................................................ 11

5-3. After IGN Start, Device Has Started, Iqis About 30 mA, Device is in Diagnostic Mode ......................... 12

5-4. Clear ERR Fail and WD Fail............................................................................................. 12

5-5. Clear DIAG EXIT MASK = Device is in Active Mode................................................................. 13

5-6. Set ENDRV and Read Back Pin Level ENDRV....................................................................... 13

6-1. TPS65381EVM Schematic............................................................................................... 14

7-1. EVM Top View............................................................................................................. 15

7-2. EVM Bottom View......................................................................................................... 16

8-1. Top Assembly Layer ...................................................................................................... 17

8-2. Bottom Assembly Layer .................................................................................................. 18

9-1. Top Layer Routing......................................................................................................... 19

9-2. Layer 2 (AGND) Routing ................................................................................................. 19

9-3. Layer 3 Routing............................................................................................................ 20

9-4. Layer 4 Routing............................................................................................................ 20

List of Tables

1-1. Device and Package Configurations ..................................................................................... 4

3-1. EVM Connectors............................................................................................................ 6

3-2. EVM Voltages ............................................................................................................... 7

3-3. EVM Jumper................................................................................................................. 7

3-4. EVM Test Points ............................................................................................................ 8

SLVU847–April 2013 List of Figures

Chapter 1

SLVU847–April 2013

Introduction

The Texas Instruments TPS65381EVM evaluation module (EVM) helps engineers evaluate the operation

and performance of the TPS65381-Q1 power supply IC for safety applications. The device offers

configurability through a serial peripheral interface (SPI).

The EVM contains the TPS65381-Q1 device and some circuitry for basic operation. It has a connection for

a optional TIGER board (not included) to configure the TPS65381-Q1 device through the SPI but can also

run without or with different SPIs, for example, from a microcontroller (MCU) supplied by the EVM.

Table 1-1. Device and Package Configurations

CONVERTER IC PACKAGE

IC1 TPS65381QDAPRQ1 DAP-32

PowerPAD is a trademark of Texas Instruments.

4Introduction SLVU847–April 2013

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Chapter 2

SLVU847–April 2013

Background

The TPS65381-Q1 device is a multi-rail power supply designed to supply MCUs in safety-critical

applications, such as those found in automotive. The devices supports Texas Instruments TMS570LS

series 16 or 32-Bit RISC Flash MCU and other MCUs with dual-core lockstep (LS) or loosely coupled (LC)

architectures.

The TPS65381-Q1 device integrates multiple supply rails to power the MCU, controller area network

(CAN) or FlexRay and an external sensor. An asynchronous buck switch-mode power supply converter

with internal FET converts the input battery voltage to a 6-V pre-regulator output. This 6 V is used to

supply the other regulators.

A fixed 5V linear regulator with internal field effect transistor (FET) is integrated to be used as, for

example, CAN supply. A second linear regulator with also internal FET regulates the 6 V to a selectable 5-

V or 3.3-V MCU input/output (IO) voltage.

The TPS65381-Q1 device comprises a linear regulator controller with external FET and resistor divider,

regulating the 6 V to an externally adjustable core voltage between 0.8 V and 3.3 V.

The device comprises a sensor supply with short-to-ground and short-to-battery protection. This supply

can therefore be used to power a sensor outside the electronic control unit (ECU).

The device has an integrated charge pump to provide overdrive voltage for the internal regulators. A

reverse battery protection can be obtained by using the charge pump output to control an external N-

channel metal oxide semiconductor (NMOS) transistor. This solution allows for a lower minimum battery

voltage operation compared to a traditional reverse battery blocking diode.

The device monitors under- and overvoltage on all regulator outputs, battery voltage and internal supply

rails. A second bandgap reference, independent from the main bandgap reference, is used for the under-

and overvoltage monitoring to prevent any drifts in the main bandgap reference from going undetected. In

addition, regulator current limits and temperature protections are implemented.

The TPS65381-Q1 device functional safety architecture features a question-answer watchdog (WD), an

MCU error signal monitor, clock monitoring on internal oscillators, self-check on clock monitor, cyclic

redundancy check (CRC) on non-volatile memory, and a reset circuit for the MCU. A build-in self-test

(BIST) allows for monitoring the device functionality at start up. A dedicated DIAGNOSTIC-state allows the

MCU to check TPS65381-Q1 device safety functions.

SLVU847–April 2013 Background

Chapter 3

SLVU847–April 2013

Setup

This section describes the jumpers and connectors on the EVM and how to properly connect, set up and

use the TPS65381EVM.

3.1 I/O Connector Description

Three connectors are placed to supply the device under test (DUT) to get access to different signals for

programming or to measure.

CON1 is the supply connector to provide the battery voltage and offer a connection to SPI.

CON2 is the output connector to deliver the output voltage of the different regulators.

CON3 is a connector to either the SPI of an application circuit, or the optional TIGER board which

provides a universal serial bus (USB) to SPI connection.

Table 3-1. EVM Connectors

CON1 CON2 CON3

PIN NO. SIGNALS PIN NO. SIGNALS PIN NO. SIGNALS

1 VBAT_SAFING 1 GND 1 SDO

2 GND 2 ENDRV 2 GND

3 VBATP 3 GND 3 SCLK

4 GND 4 IGN 4 GND

5 VCP 5 GND 5 NCS

6 GND 6 VBATP 6 GND

7 VDD5 7 GND 7 SDI

8 GND 8 VDD6 8 GND

9 VDD3/5 9 GND 9 Open

10 GND 10 VDD6 10 Open

11 VDD1 11 GND 11 ENDRV

12 GND 12 VDD3/5 12 RES

13 RES 13 GND 13 CANWU

14 GND 14 VDD3/5 14 ERROR

15 DIAG_OUT 15 GND 15 DIAGOUT

16 GND 16 VDD5 16 IGN

17 NCS 17 GND 17 Open

18 GND 18 VDD5 18 Open

19 SDI 19 GND 19 VDDIO

20 GND 20 VDD1 20 Open

21 SDO 21 GND 21 Open

22 GND 22 VDD1 22 Open

23 SCLK 23 GND 23 Open

24 GND 24 VBATP 24 Open

25 VDDIO 25 GND 25 Open

26 GND 26 VSIN 26 Open

6Setup SLVU847–April 2013

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Supply

Table 3-1. EVM Connectors (continued)

CON1 CON2 CON3

27 ERROR 27 GND 27 Open

28 GND 28 VDD6 28 Open

29 CANWU 29 GND 29 Open

30 GND 30 VSOUT1 30 Open

3.2 Supply

The input voltage range for the converter is VBATP = VBAT_SAFING = 5.8 volts to 36 volts. It should be

supplied to CON1, pin 1 (VBAT_SAFING) and 3 (VBATP) with respect to pin 2 and 4 (GND).

Table 3-2. EVM Voltages

PARAMETER TEST CONDITIONS CONNECTOR PIN MIN TYP MAX UNIT

VBATP Can be connected to VBAT_SAFING 1 3 5.8 14 36 V

by placing J1

VBAT_SAFIN Can be connected to VBAT_P by 1 1 5.8 14 36 V

G placing J1

VDD6 2 8, 10 5.4 6 6.6 V

VDD1 2 20, 22 0.8 1.2 3.3 V

VDD3/5 2 12, 14 3.23 / 4.9 3 / 5 3.36 / 5.1 V

VDD5 2 16, 18 4.9 5 5.1 V

VSOUT1 2 30 3.3 5 9.5 V

VDDIO 1 25 3.3 5 V

3.3 Jumper Setting

For proper operation of the TPS65381-Q1 device, the jumper should be properly configured. The

recommended setting is shown in the table below.

Table 3-3. EVM Jumper(1)

J NO. DESCRIPTION OPTION STANDARD

J1 Connect VBAF_SAFING to VBATP. Open and supply VBAT_SAFING with separate Set

supply voltage.

J2 Use VSOUT1 as follower or with gain. Open VSOUT1 has gain defined by R11 and R12. Set Open

is VSOUT1 is follower.

J3 Select the tracking input. Open for non-tracking mode or connect to VDD3/5 or Open

VDD5 for tracking mode.

J4 Select the VDDIO voltage. Connect to VDD3/5 or VDD5. VDD5

J5 Select output voltage VDD3/5. Open VDD3/5 = 3.3 V. Set VDD3/5 = 5 V. Set

J6 IGN supported by TIGER board and SPI Open is not supported by SPI. Closed can be Open

connector CON3. supported by SPI.

CON2, pin 4 Connector 2 (pin 4) is the IGN pin; must be Remove the jumper to use the EVM together with Set

connected to CON2, pin 4 to turn the DUT TIGER board.

on.

(1) For start-up without using the TIGER board or external IGN signal, IGN (pin 4 of CON2) can be connected to VBATP (pin 6 of

CON2) by setting a jumper to start up the device.

SLVU847–April 2013 Setup

Test Points

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3.4 Test Points

Test points are placed to measure different nodes on the board.

Table 3-4. EVM Test Points

NO. TEST POINT

1 VBAT_SAFING

2 RES

3 DIAG_OUT

4 NCS

5 SDI

6 SDO

7 SCLK

8 ERROR

9 CANWU

10 VSOUT1

11 VSIN

12 VSOUT1

13 VTRACK1

14 VDD5

15 VDD3/5

16 VDD1_SENSE

17 VDD6

18 VDD1_G

19 VBATP

20 IGN

21 SEL_VDD3/5

22 ENDRV

3.5 VDD6 Voltage Regulator

The VDD6 voltage regulator is supplied by VBATP. Several blocking capacitors C8, C9 and C10 are

connected from VBATP to GND, helping stabilize the supply voltage. For long supply cables, additional

bigger capacitors could be helpful. The node SDN6 is the switching node of the buck converter. L1 is the

inductor connected to SDN6 and VDD6. The freewheeling diode D1 allows current flow when the device

internal high-side transistor is turned off. C11 and C12 are the output capacitors of the VDD6 regulator.

R16 is the ESR of C12 for better stability. The VDD6 pin is the feedback line to close the control loop of

the VDD6 regulator, and is also the supply node for the VDD3/5 and VDD5 regulators. The output voltage

VDD6 is available at CON2, pins 8 and 10.

3.6 VDD1 Voltage Regulator

The VDD1 regulator has a device internal control amplifier and an external NMOS power transistor. The

regulator is supplied by VDD6. C14 stabilizes the input voltage of the VDD1 regulator. The voltage

dividers R13 and R14 define the output voltage and close the control loop to VDD1_SENSE. Additionally,

a minimum required current flows though both resistors. The output capacitors C15 and C16 are needed

to stabilize the control loop. The output voltage VDD1 is available at CON1, pin 11, and CON2, pins 20

and 22.

3.7 VDD3/5 Voltage Regulator

The VDD3/5 regulator is supplied internally by VDD6. SEL_VDD3/5 can select the output voltage. If the

pin is open, 3.3 V is selected. If the pin is shorted to GND, 5 V is selected. The output capacitor C6 is

needed to stabilize the output voltage. The output voltage VDD3/5 is available at CON1, pin 9, and CON2,

pins 12 and 14.

8Setup SLVU847–April 2013

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VDD5 Voltage Regulator

3.8 VDD5 Voltage Regulator

The VDD5 regulator is supplied internally by VDD6. The output capacitor C5 is needed to stabilize the

output voltage. The output voltage VDD5 is available at CON1, pin 7, and CON2, pins 16 and 18.

3.9 VSOUT1 Voltage Regulator

VSIN is the supply pin of VSOUT1 voltage regulator. If VSIN is connected to VDD6, lower power

dissipation can be achieved by placing a jumper to short between pin 26 and 28 of CON2. If VSIN is

connected to VBATP, higher power dissipation can be achieved by placing a jumper to short between pin

24 and 26 of CON2. The capacitor C3 stabilizes the input voltage. The voltage regulator can be used in

tracking or non-tracking mode. Additionally, the voltage dividers R1_4 and R1_5 can be used to define the

output voltage. The capacitor C4 is needed for stable operation. The output voltage VSOUT1 is available

at CON2, pin 30.

SLVU847–April 2013 Setup

Chapter 4

SLVU847–April 2013

TIGER GUI Software

The graphical user interface (GUI) software is intended to support a quick start of the TPS65381-Q1

evaluation. As the USB to SPI connection, a TIGER board is needed to run the software. It can be

connected directly to CON3.

After first starting the software, the installation of a .net environment might be needed. It can be

downloaded at microsoft.com.

The software provides the user a GUI for easy set-up and control of the TPS65381-Q1 device.

10 TIGER GUI Software SLVU847–April 2013

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