Microchip PS810 Handleiding

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© 2006 Microchip Technology Inc.DS21904C-page 1

PS810

Hardware Features

•Highly accurate fuel gauge for single cell Li Ion

applications

•Algorithms are implemented using an embedded

PIC18 low-power microcontroller with 16-bit

instruction set

•Reports current, voltage and temperature utilizing a

programmable 8 to15-bit + sign, sigma-delta ADC

•Host communication accomplished through an

industry standard SMBus interface or an

alternative single pin serial interface

•I/O pins are available to provide functions such as

digital GPIO, coin cell voltage measurement and

thermistor input

•Integrated temperature sensor and regulator

minimize external components

•Embedded fuel gauge algorithms and application

specific parameters are stored in a 4K x 16 Flash

memory

•512 bytes of RAM are available for temporary

storage of battery parameters

Software Features

•Provides battery status, such as average time to empty,

relative State-Of-Charge and battery State-Of-Health

•In-system offset calibration compensates for

offset error in current measurement

Package Features

•16-pin QFN package or 14-pin TSSOP package

•-20°C to +85°C operating temperature range

Pin Description

1.0PRODUCT OVERVIEW

The PS810 is a fuel gauge for one-cell Li Ion or Li Poly-

mer applications. The device provides the host and the

system user with critical battery information, such as

voltage, current, temperature, run time, State-Of-Charge

and State-Of-Health. This information is available

through an industry standard SMBus or an alternative

Single Pin Serial interface. Advanced fuel gauge

algorithms are stored in on-board Flash memory and

executed by the industry recognized PIC18 micro-

controller. These algorithms include compensation

factors which optimize the performance of the battery for

a specific application and operating environment.

Compensation is included for the effects of temperature,

discharge rate, charge rate and battery aging.

To provide precise measurements of current, voltage and

temperature, the PS810 integrates a highly accurate

15-bit + sign, sigma-delta A/D converter. Based upon

operating conditions, this programmable converter can be

configured to measure specific battery parameters with a

resolution of 8 to 15 bits + sign. Precision measurements

combined with advanced algorithms provide accurate

indications of capacity, run time, State-Of-Health and

safety and charge/discharge conditions.

The ability to operate directly from a single Li Ion or Li

Polymer cell minimizes the need for external compo-

nents, such as a voltage regulator and voltage divider.

To further limit external circuitry and enhance accuracy,

the PS810 provides an integrated temperature sensor

and oscillator.

IO4

GND

N/C

VC1

IO1

NTC/IO2

1

2

3

4

567

16151413

12

11

10

PS810

8

9

IO5

ROSC

16-pin QFN (4 mm x 4 mm)

VCOIN/IO3

V

FILTER

MCLR

N/C

SCL/IO0

IO6

SDA/SPS

SR

2

NTC/IO2

SDA/SPS

GND

SR

MCLR

VC1

IO6

IO5

V

COIN/IO3

V

FILTER

1

2

3

4

5

6

7

14

13

12

11

10

9

8

PS810

IO4

R

OSC

SCL/IO0

IO1

14-pin TSSOP

Li Ion Single Cell Fuel Gauge

Product specificaties