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dc1496fa

DEMO MANUAL DC1496B

DESCRIPTION

LTC2941/LTC2942:

Battery Gas Gauge with I

Interface and 14-Bit ADC

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

LT C

2941. Demonstration circuit 1496B-B features the

LTC2942. Demonstration circuit 1496B-C features the

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

LTC2942-1. The C, D options 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/I

C interface.

The LTC2941/LTC2941-1 has programmable high and

low thresholds for accumulated charge. The LTC2942/

LTC2942-1 has programmable high and low thresholds for

all three measured quantities. If a programmed threshold

is exceeded, the device reports an alert using either the

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

No Latency ∆Σ is a trademark of Linear Technology Corporation. All other trademarks are

the property of their respective owners.

SMBus alert protocol or by setting a ﬂ ag 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 inter-

nal resistor. The default value assembled on the DC1496 is

100mΩ for a maximum current measurement of 500mA.

Both parts have a software-conﬁ gurable charge complete/

alert pin. When the pin is set for charge complete, a jumper

connects the pushbutton which simulates a logic high input

to indicate a full battery. When the pin is conﬁ gured for

alert, the same jumper is used to connect a red LED that

indicates an alert is present. A change was made between

DC1496A and DC1496B to ﬂ oat the exposed pad under

the LTC2941/LTC2942 in accordance with the data sheet

recommendations.

The DC1496B is a part of the QuikEval system for quick

evaluation with a host controller through a PC.

Design ﬁ les for this circuit board are available at

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

Figure 1. DC1496B

1 2 3 4 5 6 7 8 9 10

Indice de contenidos

Pagina 1 - Figure 1. DC1496B

1dc1496faDEMO MANUAL DC1496B DESCRIPTIONLTC2941/LTC2942: Battery Gas Gauge with I2C Interface and 14-Bit ADC Demonstration circuit 1496B-A (Figure 1)

Pagina 2 - QUICK START PROCEDURE

10dc1496faDEMO MANUAL DC1496BLinear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.l

Pagina 3 - QuikEval INTERFACE

2dc1496faDEMO MANUAL DC1496BBUS PULL-UPVOLTAGETO MICROCONTROLLERVSENSECHARGER LOADTO QuikEvalBATTERY1-CELLLi-Ion+–+–QUICK START PROCEDUREDemonstration

Pagina 4

3dc1496faDEMO MANUAL DC1496BQuikEval INTERFACEThe DC1496B can be connected to a DC590 and used with the QuikEval software. The DC590 connects to a PC

Pagina 5

4dc1496faDEMO MANUAL DC1496BQuikEval INTERFACEAddress/I2C StatusThe write address for the LTC2941/LTC2942/LTC2941-1/LTC2942-1 is C8h and the read addr

Pagina 6 - PARTS LIST

5dc1496faDEMO MANUAL DC1496Bcount, while the low thresholds are rounded up to nearest higher count. Switching back and forth between Hex and Unit can

Pagina 7 - SCHEMATIC DIAGRAM

6dc1496faDEMO MANUAL DC1496BPARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURE/PART NUMBER1 2 C1, C2 CAP., CHIP X7R, 0.1μF, 25V, 0603 AVX, 0603

Pagina 8 - PCB LAYOUT AND FILM

7dc1496faDEMO MANUAL DC1496BSCHEMATIC DIAGRAM1122334455667788A AB BC CD DNOTES:Performance Or Reliability. Contact Linear TechnologyCircuit Board Layo

Pagina 9

8dc1496faDEMO MANUAL DC1496BSilkscreen TopComponent SideInner Layer 2PCB LAYOUT AND FILM

Pagina 10 - DEMO MANUAL DC1496B

9dc1496faDEMO MANUAL DC1496BInformation furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility

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