Texas Instruments TPS2231EVM User manual


  
 
July 2004 PMP Systems Power
User’s Guide
SLVU113

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Mailing Address: Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright 2004, Texas Instruments Incorporated

EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION
PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided
may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective
considerations, including product safety measures typically found in the end product incorporating the goods.
As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic
compatibility and therefore may not meet the technical requirements of the directive.
Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned
within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE
WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED,
IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY
PARTICULAR PURPOSE.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user
indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products
received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction
of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic
discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE
TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not
exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or
infringement of patents or services described herein.
Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM
User’s Guide prior to handling the product. This notice contains important safety information about temperatures
and voltages. For further safety concerns, please contact the TI application engineer.
Persons handling the product must have electronics training and observe good laboratory practice standards.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any
machine, process, or combination in which such TI products or services might be or are used.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2004, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 1.6 V and 3.6 V and the
output voltage range of 1.6 V and 3.6 V.
Exceeding the specified input range may cause unexpected operation and/or irreversible
damage to the EVM. If there are questions concerning the input range, please contact a TI
field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or
possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to
connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than
85°C. The EVM is designed to operate properly with certain components above 85°C as long
as the input and output ranges are maintained. These components include but are not limited
to linear regulators, switching transistors, pass transistors, and current sense resistors. These
types of devices can be identified using the EVM schematic located in the EVM User’s Guide.
When placing measurement probes near these devices during operation, please be aware
that these devices may be very warm to the touch.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2004, Texas Instruments Incorporated

Related Documentation From Texas Instruments
v
Preface

About This Manual
This user’s guide describes the TPS2231 HPA074 evaluation module (EVM).
This guide contains the EVM schematic, bill of materials, assembly drawing
and top and bottom board layouts.
How to Use This Manual
This document contains the following chapters:
-Chapter 1− Introduction
-Chapter 2 − Hardware Overview
-Chapter 3 − EVM Operation
-Chapter 4 – Bill of Materials
-Chapter 5 − EVM Schematic and Layout
Related Documentation From Texas Instruments
TPS2231 ExpressCardtPower-Interface Switch − data sheet, SLVS536
Trademark
ExpressCard is a trademark of the Personal Computer Memory Card Interna-
tional Association (PCMCIA).
FCC Warning
This equipment is intended for use in a laboratory test environment only. It gen-
erates, uses, and can radiate radio frequency energy and has not been tested
for compliance with the limits of computing devices pursuant to subpart J of
part 15 of FCC rules, which are designed to provide reasonable protection
against radio frequency interference. Operation of this equipment in other en-
vironments may cause interference with radio communications, in which case

Contents
vi
the user at his own expense will be required to take whatever measures may
be required to correct this interference.

Contents
vii

1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Hardware Overview 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 EVM Operation 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Setup 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Slide Switches 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Test Points 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 Features 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.1 Input and Output Capacitors 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.2 LEDs 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.3 Clock Oscillator 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.4 ExpressCard Socket 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Bill of Materials 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Bill of Materials 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 EVM Schematic and Layout 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 Schematic 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 Layout 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5−1 TPS2231EVM Schematic Diagram 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5−2 Top Assembly Layer 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5−3 Bottom Assembly Layer 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
viii

1-1
Introduction

This User’s Guide describes the setup and operation of the TPS2231
evaluation module (EVM) HPA074. Information and instruction presented
throughout this document assumes user familiarity with the data sheet of the
TPS2231 ExpressCard power-interface switch.
Chapter 1

1-2

2-1
Hardware Overview
 
The HPA074 EVM features the TPS2231 made by Texas Instruments
Incorporated. The EVM has been designed to be simple and straight-forward
for users to evaluate the TPS2231 device with all the necessary external
components and test points. An ExpressCard compliant socket is installed for
insertion of an ExpressCard card.
Chapter 2

2-2

3-1
EVM Operation
 
This chapter describes the setup and configuration of the TPS2231 EVM.
Topic Page
3.1 Setup 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Slide Switches 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Test Points 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 Features 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3

Setup
3-2
3.1 Setup
The HPA074 EVM is designed to allow evaluation of the TPS2231 device. Test
points and slide switches are provided to facilitate various tests and configura-
tions.
3.2 Slide Switches
On the HPA074 EVM, 6 slide switches (S1 through S6) are provided to set the
logic levels on the TPS2231 logic inputs. When the handle of a switch is placed
on position 1, the respective TPS2231 input will be pulled up to the AUXIN for
S1 to S5 or Hi-Z for S6. If a switch is placed on position 0, the respective logic
input will be connected to ground (GND).
Switch Name Related Signal Initial Position
S1 STBY 1
S2 SHDN 1
S3 SYSRST 1
S4 CPPE 1
S5 CPUSB 1
S6 RCLKEN 1
3.3 Test Points
All of the test points on the HPA074 EVM are listed in the following table.
Test Points Description
TP1, TP11, TP20 Ground (GND)
TP2 Test point for TPS2231 AUXIN pin
TP3 Test point for TPS2231 STBY pin
TP4 Test point for TPS2231 SHDN pin
TP5 Test point for TPS2231 SYSRST pin
TP6 Test point for TPS2231 OC pin
TP7 Test point for TPS2231 AUXOUT pin
TP8 Test point for U2 output pin (inverting output clock)
TP9 Test point for U4 output pin (noninverting output clock)
TP10 Test point for U3 output pin (input clock)
TP12 Test point for TPS2231 3.3VIN pin
TP13 Test point for TPS2231 3.3VOUT pin
TP14 Test point for TPS2231 PERST pin
TP15 Test point for TPS2231 CPPE pin
TP16 Test point for TPS2231 CPUSB pin
TP17 Test point for TPS2231 RCLKEN pin
TP18 Test point for TPS2231 1.5VIN pin
TP19 Test point for TPS2231 1.5VOUT pin

Features
3-3
EVM Operation
3.4 Features
In order to easily evaluate the TPS2231 PD controller, the EVM features are
described in this section.
3.4.1 Input and Output Capacitors
The input capacitances of the TPS2231 voltage inputs are recommended to
be at least 4.7 µF. The output capacitances are at least 0.1 µF but greater
output capacitance will improve system performance during transients. The
ExpressCard specifications defines the total host and card capacitance to be
less than 100 µF. The EVM has one 0.1-µF capacitor and a 68-µF capacitor
on each of the three voltage outputs.
3.4.2 LEDs
Four LEDs are installed on the HPA074 EVM to indicate the states of the three
voltage outputs and the OC flag. When there is an overcurrent condition at any
of the internal power switches of the TPS2231, D1 will be turned on. If D2 is
on, 1.5VOUT is within its regulation range. Similarly, D3 indicates the voltage
of AUXOUT, and D4 is for 3.3VOUT.
3.4.3 Clock Oscillator
A 10-MHz clock is generated by U3 and it can be tested at TP10. The RCLKEN
signal of the TPS2231, when it is high, will enable drivers (U2 and U4) to have
an inverting clock output at TP8 and a noninverting clock output at TP9, and
both are passed to the ExpressCard socket at J2.
3.4.4 ExpressCard Socket
An Expresscard compliant card socket J2 is installed. It can be used to evalu-
ate the TPS2231 with an ExpressCard card (not supplied with the HPA074
EVM) inserted.

3-4

4-1
Bill of Materials
  
This chapter contains the bill of materials for the TPS2231EVM.
Topic Page
4.1 Bill of Materials 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 4

Bill of Materials
4-2
4.1 Bill of Materials
COUNT RefDes Description Value Size Part Number MFR
3C1, C2, C3 Capacitor, ceramic, 4.7−µF,
10−V, X7R, 10% 4.7 µF 1206 STD Taiyo Yuden
6C4, C5, C6, C7,
C9, C11 Capacitor, ceramic, 0.1−µF, 16−V, X7R, 10% 0.1 µF 805 STD Vishay
3C8, C10, C12 Capacitor, Poscap, 68 µF, 16V,
20% 68 µF 7343(D) 10TPC68M Poscap
4D1, D2, D3, D4 Diode, LED, Red SMD LN1271R Panasonic
1 J1 Header, 10−pin, 200 mil
spacing TH HPM−10−05−T−S Samtec
1 J2 Connector SMD PX10BSB02 JAE
1 J2 Frame TH PX10FS02PH JAE
1 J3 Header, 6−pin, 200 mil spacing TH HPM−06−05−T−S Samtec
1 Q1 MOSFET, N−ch, 60−V,
115−mA, 1.2−Ω
SOT23 2N7002 Vishay−
Liteon
1 Q2 Bipolar, NPN, 40−V, 200−mA,
225−W SOT23 MMBT3904LT1 On Semi
6R1, R2, R5, R6,
R7, R8 Resistor, chip, 2 kΩ, 1/10−W, 5% 2K 805 Std Std
2R3, R4 Resistor, chip, 0 Ω, 1/10−W, 5% 0 805 Std Std
6S1, S2, S3, S4,
S5, S6 Switch, 1P2T, slide, PC−mount, 200−mA TH EG1218 E_Switch
3TP1, TP11, TP20 Test point, black, 1 mm TH 240−333 Farnell
17 TP2, TP3, TP4,
TP5, TP6, TP7,
TP8, TP9, TP10,
TP12, TP13,
TP14, TP15,
TP16, TP17,
TP18, TP19
Test point, red, 1 mm TH 240−345 Farnell
1 U1 IC, TPS2231
ExpressCard power interface PWP24 TPS2231PWP TI
1 U2 IC, Single bus buffer gate with
3-state output DBV SN74LVC1G240DBV TI
1 U4 IC, Single bus buffer gate with
3-state output DBV SN74LVC1G125DBV TI
1 U3 Oscillator, 10-MHz, 3.3-V
version SMD ECS−3953M ECS
6 Bumbers, clear, polyurethane SDM 2566 SPC
Technology
1 −− PCB,
6.45 in. ×3.95 in. ×0.062 in. HPA074A Any
Notes: 1) These assemblies are ESD sensitive, ESD precautions must be observed.
2) These assemblies must be clean and free from flux and all contaminants. Use of no clean flux is not acceptable.
3) These assemblies must comply with workmanship standards IPC−A−610 Class 2.
4) Reference designators marked with double asterisks (**) cannot be substituted. All other components can be substi-
tuted with equivalent manufacturers components.

5-1
EVM Schematic and Layout
 !  "#
This chapter contains the schematic and layout for the TPS2231EVM.
Topic Page
5.1 Schematic 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 Layout 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 5

Schematic
5-2
5.1 Schematic
Figure 5−1.TPS2231EVM Schematic Diagram