Texas Instruments LMP91000EVM Bedienungsanleitung

User’s Guide

SNAU121- June 2012

LMP91000EVM User’s Guide

SNAU121-April 2012 LMP91000EVM User’s Guide 1

CONTENTS

1INTRODUCTION....................................................................................................... 1

2 SETUP....................................................................................................................... 1

3 BOARD LAYOUT ..................................................................................................... 5

4 SCHEMATIC............................................................................................................. 7

LIST OF FIGURES

Figure 1: Gas sensor’s footprint.......................................................................................... 2

Figure 2: 2-WIRE Jumper Settings..................................................................................... 2

Figure 3: J_MENB Jumper Settings ................................................................................... 3

Figure 4: Connection of the LMP91000EVM to SPIO4 board............................................ 3

Figure 5: Top Layer Routing............................................................................................... 5

Figure 6: Bottom Layer Routing.......................................................................................... 6

Figure 7: LMP91000EVM Schematic.................................................................................. 7

LIST OF TABLES

Table 1: Device and Package Configurations .................................................................... 1

Table 2: Recommended p-FETs for short circuiting RE and WE when LMP91000 is OFF2

Table 2: LMP91000EVM Bill of Materials........................................................................... 8

1. Introduction

The Texas Instruments LMP91000EVM evaluation module (EVM) helps designers evaluate the operation and

performance of the LMP91000 Sensor Analog Front End for Electrochemical sensor. The LMP91000EVM is

part of the Sensor AFE eval platform

The EVM contains one LMP91000, (See Table 1).

Table 1: Device and Package Configurations

DEVICE

PACKAGE

U1 LMP91000SD LLP-14

The LMP91000EVM is provided with a 16 bit ADC (ADC161S626) in order to capture the output of the LMP91000.

The LMP91000EVM is not provided with any gas sensor. It supports 3-lead electrochemical cells and 2-lead

galvanic cell in potentiostat configuration.

2. Setup

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

and use the LMP91000EVM in the Sensor AFE eval platform.

2 LMP91000EVM User’s Guide SNAU121-April 2012

2.1. Gas Sensor Connection

Both 3-lead and 2-lead gas sensor need to be placed in the Gas Sensor Fooptrint

Figure 1: Gas sensor’s footprint

2.1.1. Not Biased Gas sensor

Even if the LMP91000 is provided with an internal switch to short the RE and WE pin that can be enabled

when the device is in Deep sleep mode, it is possible to add an external JFET which makes the same feature

when the gas sensor is left connected to the board and the LMP91000 is turned off.

The JFET (Q1) should be a p-type FET. Recommended FETs are listed in the table below.

The gate resistance R12 can be populated with a 1kohm resistor.

Table 2: Recommended p-FETs for short circuiting RE and WE when LMP91000 is OFF

DEVICE

DESCRIPTION

MANUFACTURER

PACKAGE

PMBFJ177 P-channel Silicon Junction Field-

effect Transistor

NXP SEMICONDUCTOR

SOT23

SST177 VISHAY SILICONIX

MMBF177 Fairchild

2.2. Jumpers Configuration

2-WIRE is the jumper which shorts CE and RE pin when a 2-lead gas sensor is connected to the LMP91000.

2-WIRE

2-lead gas

sensor

2-WIRE

3-lead gas

sensor

Figure 2: 2-WIRE Jumper Settings

J_MENB configures the Module Enable of the LMP91000 either manual or controlled by external

microcontroller. In manual mode, the Module Enable of the LMP91000 is tied to GND. When the

LMP91000EVM is connected to the SPIO4 board pin 1-2 need to be shorted.

SNAU121-April 2012 LMP91000EVM User’s Guide 3

J_MENB

Manual

J_MENB

Microcontroller

Figure 3: J_MENB Jumper Settings

2.3. Connection of the LMP91000EVM to SPIO4 Board

The SPIO4 board is a data capture board required when the LMP91000 is used in the Sensor AFE eval

platform. The LMP91000EVM is connected to the SPIO4 board through the SPIO-GPSI16 connector.

The white arrows present on both LMP91000EVM and SPIO4 board need to be aligned in order to guaranty

the right connection.

Figure 4: Connection of the LMP91000EVM to SPIO4 board

2.4. LMP91000EVM as part of Sensor AFE eval platform

When the LMP91000EVM is part of the Sensor AFE eval platform it doesn’t require any external power

supply to properly work.

Before using the Sensor AFE eval platform make sure the following steps have been accomplished:

1. Install the Graphical User Interface of the LMP91000EVM

2. Connect the LMP91000EVM to the SPIO4 board

3. Connect the USB cable to SPIO-4 board

4. Connect the other end of the USB cable to an available USB port on the computer

5. Run the Graphical User Interface

The voltage at VDD pin of the LMP91000 (VDD test point) is 3.3V, the voltage at VREF pin of the LMP91000

(VREF test point) is 2.5V. The LMP91000EVM is ready to work.

2.5. LMP91000EVM In Standalone Operation (without ADC)

The LMP91000EVM can be used as a standalone board. In this case it requires the following voltages

2.5.1. Jumper/s setting

J_MENB - pin 2 and 3 shorted (manual mode), if on the I2C bus already exist a device with the same

address of the LMP91000, leave pin1 and 2 shorted.

2.5.2. Power supply

1. Remove R7 resistor

2. Connect a supply voltage (2.7V to 5.25V) between VDD test point and GND test point.

4 LMP91000EVM User’s Guide SNAU121-April 2012

2.5.3. Voltage reference

If the on board 2.5V voltage reference fits the requirements of the application, do not accomplish the

following steps.

1. Remove R6 resistor

2. Connect a reference voltage (1.5V to VDD) between VREF test point and GND test point.

2.5.4. I2C bus

The I2C bus requires two 10kohm pull-up resistors (R1, R2); the external microcontroller can be connected to the

SPIO-GPSI16 connector according to the following pin out:

SCL pin 12 of SPIO-GPSI16

SDA pin 11 of SPIO-GPSI16

GND pin 2 of SPIO-GPSI16

Refer to LMP91000’s datasheet for further details on I2C commands and registers.

The footprints of the pull-up resistors (R1, R2) are on the bottom side of the eval board.

2.5.5. Other

Remove the resistor R8 in order to disconnect the ADC’s input from LMP91000’s output.

SNAU121-April 2012 LMP91000EVM User’s Guide 5

3. Board Layout

Figure 5, Figure 6 and Figure 7 show the board layout for the LMP91000EVM.

The EVM offers footprint for

- External JFET (Q1) to short RE and WE pin,

- Resistor (R3) and capacitor (C2) to apply external RTIA gain and filter

Figure 5: Top Layer Routing

Bill of Materials

6 LMP91000EVM User’s Guide SNAU121-April 2012

Figure 6: Bottom Layer Routing

SNAU121-April 2012 LMP91000EVM User’s Guide 7

4. Schematic

Figure 7: LMP91000EVM Schematic

Bill of Materials

8 LMP91000EVM User’s Guide SNAU121-April 2012

Table 3: LMP91000EVM Bill of Materials

COUNT

REF DES

DESCRIPTION

SIZE

MFR

PART NUMBER

1 2-wire

Header, TH, 100mil, 1x2, Gold

plated, 230 mil above insulator

0.100 x

Samtec Inc. TSW-102-07-G-S

3V3, 5V, SCL,

SDA, VDD,

TP_C1, TP_C2,

VOUT, CSB,

DOUT,SCLK,

VREF

Test Point, TH, Miniature, Red 40 mil Keystone

Electronics 5000

1 C1

CAP, CERM, 0.1uF, 10V, +/-

10%, X5R

402 MuRata

GRM155R61A104

KA01D

C5, C9, C11,

C13, C16

CAP, CERM, 0.1uF, 16V, +/-5%,

X7R

603 AVX 0603YC104JAT2A

1 C6

CAP, CERM, 56pF, 50V, +/-5%,

C0G/NP0

603 AVX 06035A560JAT2A

1 C7

CAP, TANT, 100uF, 10V, +/-

10%, 0.1 ohm

6032-28 AVX

TPSC107K010R01

1 C8

CAP, CERM, 470pF, 50V, +/-

5%, C0G/NP0

603 AVX 06035A471JAT2A

3 C10, C12, C14

CAP, TANT, 10uF, 16V, +/-10%,

0.45 ohm

6032-28

Vishay-

Sprague

593D106X9016C2

TE3

GND1, GND2,

GND3, GND4,

Test Point, TH, Miniature, Black 40 mil

Keystone

Electronics

5001

GAS_SENSOR

Gas sensor Hood

100mil

Cambion

450-3326-01-03-00

4 H1, H2, H3, H4

BUMPON HEMISPHERE .44X.20

BLACK

3M SJ-5003 (BLACK)

1 J_MENB

Header, TH, 100mil, 1x3, Gold

plated, 230 mil above insulator

0.100 x

Samtec Inc. TSW-103-07-G-S

2 R4, R8 RES, 20.0 ohm, 1%, 0.1W 603

Yageo

America

RC0603FR-

0720RL

2 R6, R7 RES, 0 ohm, 5%, 0.125W 805 Vishay-Dale

CRCW08050000Z0

1 R10 RES, 27.4 ohm, 1%, 0.1W 603 Vishay-Dale CRCW060327R4F

KEA

1 SPIO-GPSI16 SPIO-GPSI16 Header, 8-Pin,

Dual row, Right Angle

0.100 x

8 dual

row

Sullins

Connector

Solutions PBC36DGAN

1 U1 LMP91000 LLP-14

Texas

Instruments

LMP91000SD

1 U2 IC ADC 16BIT 50-250KSPS

MSOP-

Texas

Instruments

ADC161S626CIM

M/NOPB

1 U3

Precision Micropower Low

Dropout Voltage Reference

SOT-23

Texas

Instruments

LM4120AIM5-2.5

1 U4 IC EEPROM 2KBIT 400KHZ TSSOP-

Semiconductor

CAT24C01WI-GT3

SNAU121-April 2012 LMP91000EVM User’s Guide 9

EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS

Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions:

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.

Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/ kit may be

returned within 30 days from the date of delivery for a full refund. THE FOREGOING LIMITED 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. 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.

Please read the User's Guide and, specifically, the Warnings and Restrictions notice in the User's Guide prior to

handling the product. This notice contains important safety information about temperatures and voltages. For

additional information on TI's environmental and/or safety programs, please visit www.ti.com/esh or contact TI.

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. 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.

Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265

REGULATORY COMPLIANCE INFORMATION

As noted in the EVM User’s Guide and/or EVM itself, this EVM and/or accompanying hardware may or may not be

subject to the Federal Communications Commission (FCC) and Industry Canada (IC) rules.

For EVMs not subject to the above rules, this evaluation board/kit/module 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. It generates, uses, and can radiate radio frequency energy and

has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC or ICES-003

rules, which are designed to provide reasonable protection against radio frequency interference. Operation of the

equipment may cause interference with radio communications, in which case the user at his own expense will be

required to take whatever measures may be required to correct this interference.

General Statement for EVMs including a radio

User Power/Frequency Use Obligations: This radio is intended for development/professional use only in legally

allocated frequency and power limits. Any use of radio frequencies and/or power availability of this EVM and its

development application(s) must comply with local laws governing radio spectrum allocation and power limits for

this evaluation module. It is the user’s sole responsibility to only operate this radio in legally acceptable frequency

space and within legally mandated power limitations. Any exceptions to this is strictly prohibited and unauthorized

by Texas Instruments unless user has obtained appropriate experimental/development licenses from local

regulatory authorities, which is responsibility of user including its acceptable authorization.

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