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User's Guide

SLVU524A–August 2011– Revised September 2011

TPS389xA-xP-EVM047 Evaluation Modules

This user’s guide describes the characteristics and operational use of the TPS389XA-XP-EVM047

Evaluation Module (EVM) for engineering demonstration of the TPS3897A and TPS3896P supervisors

(TPS3897A-6P-EVM047), the TPS3897P and TPS3896A supervisors (TPS3897P-6A-EVM047), the

TPS3898A and TPS3895P supervisors (TPS3898A-5P-EVM047), or the TPS3898P and TPS3895A

supervisors (TPS3898P-5AEVM047). These EVMs are fully assembled and tested platforms for evaluating

the performance of the TPS389xA-xP family of supervisory circuits. Any one EVM can be manually

modified to easily accommodate alternative supervisor ICs of this same family. This TPS389XA-XP family

are adjustable supervisors in an ultra small package, that can monitor voltages greater than the 500 mV

sense voltage, whose accuracy is better than 1%. This user’s guide includes setup instructions,

schematic, bill of materials (BOM), layout, and test results for a typical SVS circuit on the EVM

Contents

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

1.1 Features ............................................................................................................. 2

1.2 EVM Interface Information and Orderable Options (Dependent on Customer Demand and

Availability) .......................................................................................................... 2

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

3 I/O Description, Threshold and Delay Calculations, and Setup ....................................................... 4

3.1 EVM Input/Output Connectors and Test Jumpers ............................................................. 4

3.2 CT and Output Delay Time ....................................................................................... 4

3.3 SVS SENSE Voltage Threshold: Programming the Threshold Voltage .................................... 4

3.4 ........................................................................................................................ 5

4 Operation ..................................................................................................................... 5

4.1 Operation Description ............................................................................................. 5

4.2 Test Results ........................................................................................................ 5

5 Board Layout ................................................................................................................ 7

6 Bill of Materials ............................................................................................................. 10

List of Figures

1 TPS389xA-xP-EVM-047 Schematic ...................................................................................... 3

2 Sense_out response (active high) to rising/falling SVS SENSE (TPS3895A) ...................................... 6

3 Sense_out response (active low) to rising/falling SVS SENSE (TPS3898A) ....................................... 6

4 Assembly Layer (Top) ...................................................................................................... 7

5 Top Layer Routing .......................................................................................................... 8

6 Bottom Layer Routing ...................................................................................................... 9

List of Tables

1 SVS Circuit Interface Information based on EVM Orderable.......................................................... 2

2 EVM Input/Output Connectors and Jumpers............................................................................ 4

3 SVS SENSE Threshold Accuracy and Resistor Divider Selection ................................................... 5

4 EVM Assembly Associated with EVM Orderable...................................................................... 10

5 ............................................................................................................................... 11

SLVU524A–August 2011–Revised September 2011 TPS389xA-xP-EVM047 Evaluation Modules

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Summary of content (13 pages)

PAGE 1
User's Guide SLVU524A – August 2011 – Revised September 2011 TPS389xA-xP-EVM047 Evaluation Modules This user’s guide describes the characteristics and operational use of the TPS389XA-XP-EVM047 Evaluation Module (EVM) for engineering demonstration of the TPS3897A and TPS3896P supervisors (TPS3897A-6P-EVM047), the TPS3897P and TPS3896A supervisors (TPS3897P-6A-EVM047), the TPS3898A and TPS3895P supervisors (TPS3898A-5P-EVM047), or the TPS3898P and TPS3895A supervisors (TPS3898P-5AEVM047).
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Introduction 1 www.ti.com Introduction The TPS389xA-xP-EVM047 helps designers evaluate the operation and performance of the TPS389xA-xP family of single channel supervisors (SVS) available in the ultra small µSon package. Each EVM has two completely independent SVS circuits each preprogrammed by a resistor divider to monitor a 3.3 V SVS SENSE rail. Each SVS circuit issues the active Sense_out when the SVS SENSE voltage rises above the preprogrammed threshold, which in this case is set to 94.5% of the 3.
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Schematic www.ti.com 2 Schematic J5 Vpullup J1 R3 VCC 0 ohm J2 SVS SENSE (6.5V max) R1 1.00M J3 U1 TPS389xDRY VCC EN 1 EN GND1 R4 49.9k 1 J6 VCC 6 2 GND CT 5 3 SNS SNS_OUT 4 Sense_out C2 R2 191k C1 J4 0.1uF J7 0.047uF GND1 GND1 GND1 J8 VCC J9 SVS SENSE (6.5V max) R5 1.00M J10 U2 TPS389xDRY VCC EN 1 EN GND2 1 J12 VCC 6 2 GND CT 5 3 SNS SNS_OUT 4 Sense_out C4 R6 191k 0.1uF C3 J11 J13 0.047uF GND2 GND2 See BOM for Install 1 GND2 Figure 1.
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I/O Description, Threshold and Delay Calculations, and Setup www.ti.com 3 I/O Description, Threshold and Delay Calculations, and Setup 3.1 EVM Input/Output Connectors and Test Jumpers Table 2. EVM Input/Output Connectors and Jumpers 3.2 Connector Label Description J1, J8 VCC Input power supply connection to the U1 and U2 SVS circuits, respectively: 1.7 V to 6.5 V . J2, J9 SVS SENSE Monitored supervisor sense voltage input to the U1 and U2 SVS circuits, respectively.
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Operation www.ti.com Table 3 shows the SVS SENSE threshold accuracy based on the resistor tolerance and the reference accuracy values. Table 3. SVS SENSE Threshold Accuracy and Resistor Divider Selection 3.4 Monitor SVS Voltage Threshold Voltage (nominal) R1(R5) Selection (0.1% Tol) Ω R2 (R6) Calculation (0.1% Tol) Ω Threshold Accuracy Min/Max Threshold Voltage 1.8 V 1.699 V (5.61% below SVS Voltage) 1M 422K 1.68V / 1.72V 3.3 V 3.118 V (5.52% below SVS Voltage) 1M 191K 3.08V / 3.15V 5.
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Operation www.ti.com Figure 2. Sense_out response (active high) to rising/falling SVS SENSE (TPS3895A) Figure 3 shows the Sense_out voltage (gold, C1) becoming active low approximately 160 ms (Input Delay) after the SVS SENSE voltage (blue, C2) rises above the threshold voltage. The Sense_out signal immediately falls when the SVS SENSE voltage falls below the threshold. The VCC voltage has been previously set to 3.3 V.
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Board Layout www.ti.com 5 Board Layout This section provides the TPS389XEVM board layout. J3 J5 R4 R3 J1 J2 J6 R2 1 R1 C2 U1 C1 J4 J7 J8 J10 J12 J9 R6 1 J11 R5 C4 U2 C3 J13 Figure 4.
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Board Layout www.ti.com Figure 5.
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Board Layout www.ti.com Figure 6.
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Bill of Materials 6 www.ti.com Bill of Materials Table 4. EVM Assembly Associated with EVM Orderable PWR047001 PWR047002 PWR047003 PWR047004 COUNT COUNT COUNT COUNT RefDes Value Description Size Part Number 2 2 2 2 C1 C3 0.047uF Capacitor, Ceramic, X7R, 10V 10% 0603 STD 2 2 2 2 C2 C4 0.1uF Capacitor, Ceramic, X7R, 50V 10% 0603 STD 11 11 11 11 J1-2 J4-9 J11-13 PEC02SAAN Header, Male 2-pin, 100mil spacing 0.
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Bill of Materials www.ti.com Table 5.
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Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.