Linear Technology DC1496C Guide de configuration rapide

dc1496cfb

DEMO MANUAL DC1496C

DESCRIPTION

LTC2941/LTC2942:

Battery Gas Gauge with I2C

Interface and 14-Bit ADC

Demonstration circuit 1496C-A (Figure 1) features the

LT C

2941. Demonstration circuit 1496C-B features the

LTC2942. Demonstration circuit 1496C-C features the

LTC2941-1. Demonstration circuit 1496C-D features the

LTC2942-1.TheC,Doptions have parts that use an internal

sense resistor while the A, B options rely on an external

precision sense resistor. All four devices measure battery

charge state in handheld PC and portable product applica-

tions. The operating range is perfectly suited for single

cell Li-Ion batteries. A precision analog coulomb counter

integrates current through a sense resistor between the

battery’s positive terminal and the load or charger. The

LTC2942 adds battery voltage and on-chip temperature

measurement with an internal 14-bit No Latency ∆Σ™

ADC. The three measured quantities (charge, voltage and

temperature) are stored in internal registers accessible via

the onboard SMBus/I2C interface.

The LTC2941/LTC2941-1 has programmable high and

low thresholds for accumulated charge. The LTC2942/

LTC2942-1 has programmable high andlow thresholds for

all three measured quantities. If a programmed threshold

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

No Latency ∆Σ and QuikEval are trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

is exceeded, the device reports an alert using either the

SMBus alert protocol or by setting a flag in the internal

status register.

The LTC2941 and LTC2942 require only a single low

value sense resistor to set the measured current range.

The LTC2941-1 and the LTC2942-1 have their own 50mΩ

internal resistor. The default value assembled on the

DC1496 is 100mΩ for a maximum current measurement

of 500mA. Both parts have a software-configurable charge

complete/alert pin. When the pin is set for charge com-

plete, a jumper connects the pushbutton which simulates

a logic high input to indicate a full battery. When the pin is

configured for alert, the same jumper is used to connect

a red LED that indicates an alert is present.

The DC1496C is a part of the QuikEval™ system for quick

evaluation with a host controller through a PC.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1496C.

Figure 1. DC1496C

Downloaded from Arrow.com.

dc1496cfb

DEMO MANUAL DC1496C

QUICK START PROCEDURE

Demonstration circuit 1496C is easy to set up to evaluate

the performance of the LTC2941/LTC2942/LTC2941-1/

LTC2942-1. Refer to Figure 2 for proper measurement

equipment setup and follow the procedure below.

1. Connect a 1-cell Li-Ion battery across V_BAT and GND.

2. Connect a load across V_CHRG/LD and GND for battery

discharge measurement. Up to 500mA supplied from

the battery can be measured with the board default

100mΩ sense resistor or 50mΩ internal resistor. Use

SENSE+and SENSE–test points to read voltage across

the sense resistor.

3. Connect a 2.7V to 5.5V battery charger supply across

V_CHRG/LD and GND. Up to 500mA supplied to the

battery can be measured with the board default 100mΩ

sense resistor. Use SENSE+and SENSE–test points to

read voltage across the sense resistor.

4. Connect a DC590 to 14-pin connector J1 for evaluation

with QuikEval, or connect a host controller I2C bus to

the SDA, SCL and GND test turrets.

5. Set JP1 to QuikEval if a DC590 is present. Otherwise

set JP1 to Bat/Chrg for bus pull-up to the battery, or

float JP1 and supply a bus pull-up voltage to VP.

6. Read and write to the LTC2941/LTC2942 through I2C.

7. Through I2C, configure the AL/CC pin. Set JP2

accordingly.

8If AL/CC is set for charge complete, use pushbutton

switch S1 to simulate a logic high from a controller to

indicate a fully charged battery.

Figure 2. DC1496C Basic Setup

BUS PULL-UP

VOLTAGE

TO MICROCONTROLLER

VSENSE

CHARGER LOAD

TO QuikEval

BATTERY

1-CELL

Li-Ion

–

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dc1496cfb

DEMO MANUAL DC1496C

QuikEval INTERFACE

The DC1496C can be connected to a DC590 and used

with the QuikEval software. The DC590 connects to a PC

through USB. QuikEval automatically detects the demo

board and brings up the LTC2941/LTC2942 evaluation

software interface (Figure 3).

Compact and Detailed Form

When the interface is brought up, a compact form is

first shown with a display for the accumulated charge

To expand the form for a more detailed display of the

LTC2941/LTC2942/LTC2941-1/LTC2942-1 registers and

board configurations, click on Detail. To go back to the

compact form, click on Hide.

Start/Refresh

Click on Start to begin a polling routine that refreshes the

interface every 1 second. Click on Stop to halt the poll-

ing. For a single update, click on Refresh. Each refresh

scans through the internal I2C registers and updates the

respective displays.

LTC2941 and LTC2942 Display

On a refresh or poll, the software reads Status bit A[7] to

determine communication with an LTC2941, LTC2942,

LTC2941-1 or LTC2942-1. When an LTC2941 is detected,

the voltage and temperature ADC and threshold displays

are not shown. Control bits B[7:6] configure VBAT Alert

for the LTC2941 and ADC Mode for the LTC2942.

ACR Display

The data in the ACR (registers C and D) is displayed in one

of three selected formats: Counter in coulombs, Counter

in mA • hour, battery gas gauge in mA • hour, and battery

gas gauge in charge percentage of battery. The two gas

gauge displays correspond to the battery gas gauge full

battery configuration set in the detailed form.

Voltage and Temperature ADC (LTC2942, LTC2942-1)

Data from the Voltage ADC (registers I and J) and the

Temperature ADC (registers M and N) is displayed here

in Volts and Celsius.

Figure 3. LTC2941/LTC2942 QuikEval Interface

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dc1496cfb

DEMO MANUAL DC1496C

QuikEval INTERFACE

Address/I2C Status

The write address for the LTC2941/LTC2942/LTC2941-1/

LTC2942-1 is C8h and the read address is C9h. The

alert response address (ARA) is 19h. If an error occurs

while reading from the LTC2941/LTC2942/LTC2941-1/

LTC2942-1, the I2C status will read as an error. Otherwise,

the status is good. If the LTC2941/LTC2942/LTC2941-1/

LTC2942-1 AL/CC pin is set for alert mode and an alert

has been latched, the device will pull down this pin. Click

on ARA to send out an ARA on to the bus lines and the

device will respond with its address. The Alert pin will then

be cleared if the alert is no longer present.

Status

The individual status bits A[0:7] and their states are shown

here. A red indicator next to bits A[0:5] indicates the re-

spective alert is currently present and will latch the Alert

pin if configured for alert. Bit A[7] shows if an LTC2941,

LTC2942, LTC2941-1 or LTC2942-1 is detected.

Sense Resistor

Enter here the sense resistor value used in the application.

The default for the DC1496C is a 100mΩ sense resistor.

Check LTC2941-1/LTC2942-1 if one of these devices is

used in place of the default IC. This sets the sense resistor

value to 50mΩ, the value of the internal sense resistor

in these devices. The sense resistor can only be changed

when not polling. The software only accepts sense resis-

tors between 0.1mΩ to 5Ω.

Battery Gas Gauge

The battery capacity in the application is entered here. The

ACR full scale (FFFFh) is set to this value and affects the

two Gas Gauge ACR display options. Instead of counting

up from 0 as in the Coulomb Counters, the Gas Gauge

is used to count down from a full battery. The battery

capacity can only be entered when not polling. The data

in the ACR when a battery should be empty is calculated

based off of RSENSE, and pre-scaler M, and displayed in

hexadecimal below the ACR full scale.

Control

Configurations done in the Control section write to the

Control register (register B). For the LTC2941, the Control

bits B[7:6] enables a battery monitor to one of three set

voltage thresholds (2.8V, 2.9V, or 3V) or disables this

battery voltage alert. The ADC mode with the LTC2942 is

defaultto Sleep

whereboth VoltageandTemperatureADCs

(LTC2942) are disabled. Setting ADC Mode to Automatic

Mode enables full-time the Voltage and Temperature ADC.

SelectingManualVoltageorTemperaturemode enables the

respective ADC once and returns the ADC to Sleep mode.

Select a pre-scaler M value to scale the ACR according

to battery capacity and maximum current. Changing the

pre-scaler will halt the poll. A calculator tool is provided

in the tool bar under Tools to assist in calculating a pre-

scaler value and sense resistor (Figure 4).

The AL#/CC pin can be configured for Alert mode, Charge

Complete mode, or disabled. Select the corresponding

settings on the DC1496C jumper J2.

The Shutdown Analog Section is checked to disable the

Analog portion of the LTC2941/42/41-1/42-1 and set the

device in a low current state.

Data in the internal registers of the LTC2941/LTC2942/

LTC2941-1/LTC2942-1 is displayed here in hexadecimal

or appropriate units. Data can also be entered and written

to the write registers. Enter data to be written in hexa-

decimal, or select Unit and enter data in decimal form.

Data in decimal scale is auto corrected if the maximum

or minimum full scale is exceeded. Select the ACR display

in Counter (Coulombs) to be able to write to the ACR and

charge thresholds in Coulombs, or select Counter (mAh)

to be able to write to the ACR and charge thresholds in

mA • hour. Voltage and Temperature High thresholds are

rounded down in the calculations to the nearest lower

count, while the low thresholds are rounded up to nearest

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dc1496cfb

DEMO MANUAL DC1496C

higher count. Switching back and forth between Hex and

Unit can be used as a conversion tool.

The LSB value for the 16-bit ACR and charge thresholds

is displayed on the bottom. This value is adjusted with the

sense resistor and pre-scaler M. The units are in mAh or

mC depending on the selected ACR display. Shown for

the LTC2942/LTC2942-1 is the LSB for the 14-bit voltage

ADC, 10-bit temperature ADC, and 8-bit high and low

thresholds for voltage and temperature.

Calculator Tool

A calculator tool is available in the tool bar options under

Tools. In this calculator (Figure 4), enter the maximum cur-

rent passed through the sense and the maximum battery

capacity. Click on Calculate to calculate a recommended

senseresistor and pre-scaler (M) value. The displayshows

the battery capacity in comparison to ACR full scale and

provides an LSB value in mAh. Also shown is the recom-

mended equation to use to determine an appropriate sense

resistor as a function of the maximum battery charge and

maximum current.

Figure 4. LTC2941/LTC2942 Pre-Scaler and Sense Resistor Calculator

QuikEval INTERFACE

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dc1496cfb

DEMO MANUAL DC1496C

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURE/PART NUMBER

1 2 C1, C2 CAP., CHIP X7R, 0.1µF, 25V, 0603 AVX, 06033C104KAT2A

2 4 E1-E4 TURRET, TESTPOINT 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0

3 5 E5-E9 TURRET, TESTPOINT 0.064" MILL-MAX, 2308-2-00-80-00-00-07-0

4 2 E10, E11 TURRET, TESTPOINT 0.054" MILL-MAX, 2309-1-00-80-00-00-07-0

5 0 TP1, TP2 SMT PADS ONLY

6 2 JP1, JP2 HEADER, 3-PIN 1 ROW 0.079CC SAMTEC, TMM-103-02-L-S

7 2 JP1, JP2 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

8 1 J1 HEADERS, VERTICAL DUAL 2 X 7 0.079CC MOLEX, 87831-1420

9 1 D1 LED, RED, LED-ROHM-SML-010VT ROHM, SML-010VTT86L

10 3 R6, R7, R8 RES., CHIP, 5.10kΩ, 1%, 0603 VISHAY, CRCW06035K10FKEA

11 3 R2, R3, R4 RES., CHIP, 10kΩ, 5%, 0603 VISHAY, CRCW060310K0JNEA

12 1 R5 RES., CHIP, 1kΩ, 5%, 0603 VISHAY, CRCW06031K00JNEA

13 1 R9 RES., CHIP, 100kΩ, 5%, 0603 VISHAY, CRCW0603100KJNEA

14 1 S1 SWITCH, SMT PUSH BUTTON PANASONIC, EVQPE105K

15 1 U2 I.C., SERIAL EEPROM TSSOP8 MICROCHIP, 24LC025-I/ST

16 1 (J1) CABLE ASSY., 8" STRIP MMT PRECISION CORP., CA-2440

17 2 STENCILS (TOP & BOTTOM) STENCIL DC1496C-1

DC1496C-A

2 0 R1 RES., CHIP, 0.1Ω, 1/8W, 1%, 1206 IRC, LRC-LR1206LF-01-R100-F

3 0 U1 I.C., BATTERY GAS GAUGE WITH I2C LINEAR TECH., LTC2942IDCB

DC1496C-B

2 1 R1 RES., CHIP, 0.1Ω, 1/8W, 1%, 1206 IRC, LRC-LR1206LF-01-R100-F

3 1 U1 I.C., BATTERY GAS GAUGE WITH I2C LINEAR TECH., LTC2942IDCB

DC1496C-C

2 0 R1 (OPT) RES., 1206

3 1 U1 I.C., BATTERY GAS GAUGE WITH I2C LINEAR TECH., LTC2941IDCB-1

DC1496C-D

2 0 R1 (OPT) RES., 1206

3 1 U1 I.C., BATTERY GAS GAUGE WITH I2C LINEAR TECH., LTC2942IDCB-1

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dc1496cfb

DEMO MANUAL DC1496C

SCHEMATIC DIAGRAM

A A

B B

C C

D D

BAT/CHRG

PULL-UP

QUICK EVAL

AL LED

AL / CC

CC PB

QUICK EVAL DEMO ONLY

LTC2942

1. ALL RESISTORS AND CAPACITORS ON THIS PAGE ARE 0603.

NOTES: UNLESS OTHERWISE SPECIFIED

-A

ASSY U1

LTC2941

SUFFIX

-B

LTC2941-1

LTC2942-1

1-1

2-1

0.1 OHMS

OPT

-C

-D

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

SAL A.REBUILD WITH CHANGE

__ 112-04-14

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

SAL A.REBUILD WITH CHANGE

__ 112-04-14

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

SAL A.REBUILD WITH CHANGE

__ 112-04-14

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

DEMO CIRCUIT 1496C

Thursday, December 04, 2014

BATTERY GAS GAUGE WITH I2C

N/A

LTC294XIDCB FAMILY

KIM T.

SAL A.

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

DEMO CIRCUIT 1496C

Thursday, December 04, 2014

BATTERY GAS GAUGE WITH I2C

N/A

LTC294XIDCB FAMILY

KIM T.

SAL A.

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

DEMO CIRCUIT 1496C

Thursday, December 04, 2014

BATTERY GAS GAUGE WITH I2C

N/A

LTC294XIDCB FAMILY

KIM T.

SAL A.

E10

SENSE+

E10

SENSE+

0.1uF

TP2TP2

GND

5.1K

100K

10K

TP1TP1

SDA E7

SDA

JP1JP1

E11

SENSE-

E11

SENSE-

V_CHRG / LD

2.7V - 5.5V

V_CHRG / LD

2.7V - 5.5V

RED

2 1

5.1K

1206

U1 *

VCC / SENSE+

1SENSE- 6

SCL

3SDA 4

AL / CC 5

GND

EX PAD

AL / CC E8

AL / CC

JP2JP2

E2 V_BAT

HD2X7-079-MOLEX

V+

GND

SCK

MISO

SDA/MOSI

GND

EESDA 9

EEVCC 10

EESCL 11

EEGND 12

GND

NC 14

10K

24LC025-I / ST

A0 1

SCL 6

A2 3

VSS

SDA 5

A1 2

WP 7

VCC 8

GND E9

GND

0.1uF

VP E5

5.1K

10K

GND

SCL E6

SCL

S1S1

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dc1496cfb

DEMO MANUAL DC1496C

Silkscreen Top Component Side

Inner Layer 2

PCB LAYOUT AND FILM

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dc1496cfb

DEMO MANUAL DC1496C

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

PCB LAYOUT AND FILM

Solder Side

SilkScreen Bottom

Inner Layer 3

REVISION HISTORY

BOARD REV DATE DESCRIPTION PAGE NUMBER

C 01/15 LED D1 Changed in BOM and Board 6

dc1496cfb

DEMO MANUAL DC1496C

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2010

LT 0115 REV B • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual 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 THE 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 THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims

arising from the handling or use of the goods. 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. Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application

engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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