PS501 datasheet(3/42 Pages) MICROCHIP

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 2004 Microchip Technology Inc.

DS21818C-page 3

PS501

1.1

Architectural Description

The PS501 is a a fully field reprogrammable single chip

solution

for

rechargeable

battery

management.

Figure 1-1 is an internal block diagram highlighting the

major architectural elements described below.

1.2

Microcontroller/Memory

The PS501 incorporates an advanced, low-power

Microchip PIC18 8-bit RISC microcontroller core. Mem-

ory resources include 16 Kbytes of reprogrammable

Flash memory for program/data storage and 256 bytes

of EEPROM for parameter storage. Both memory

arrays may be reprogrammed through the SMBus

interface.

1.3

A/D Converter

The PS501 performs precise measurements of current,

voltage and temperature, using a highly accurate 16-bit

integrating sigma-delta A/D converter. The A/D can be

calibrated to eliminate gain and offset errors and incor-

porates an auto-zero offset correction feature that can

be performed while in the end system application.

1.4

PowerSmart® Firmware/Battery

Models

Contained within the 16-Kbyte Flash memory is the

PowerSmart developed battery management firmware

that incorporates proprietary algorithms and sophisti-

cated 3-dimensional cell models. Developed by battery

chemists, the patented, self-learning 3D cell models

contain over 250 parameters and compensate for self-

discharge, temperature and other factors. In addition,

multiple capacity correction and error reducing func-

tions are performed during charge/discharge cycles to

enhance accuracy and improve fuel gauge and charge

control performance. As a result, accurate battery

capacity reporting and run-time predictions with less

than 1% error are achievable.

The reprogrammability of the Flash allows firmware

upgrades and customized versions to be rapidly

created without the need for silicon revisions.

The PS501 can be easily customized for a particular

application’s battery cell chemistry. Standard configura-

tion files are provided by PowerSmart for a wide variety

of popular rechargeable cells and battery pack

configurations.

1.5

SMBus Interface/SBData

Commands

Communication with the host is fully compliant with the

industry

standard

Smart

Battery

System

(SBS)

specification. Included is an advanced SMBus commu-

nications engine that is compliant with the SMBus v1.1

protocols. The integrated firmware processes all the

revised Smart Battery Data (SBData) v1.1 values.

1.6

Accurate Integrated Time Base

The PS501 integrates a highly accurate silicon oscilla-

tor that provides accurate timing for self-discharge and

capacity calculations and eliminates the need for an

external crystal.

1.7

Temperature Sensing

An integrated temperature sensor is provided to

minimize component count when the PS501 IC is

located in close physical proximity to the battery cells

being monitored. As an option, a connection is

provided for an external thermistor that can also be

monitored.

1.8

General Purpose I/O

Twelve programmable digital input/output pins are

provided by the PS501. Eight of these pins can be used

as LED outputs to display State-Of-Charge (SOC),

used for direct control of external charge circuitry or to

provide additional levels of safety in Li Ion packs.

Alternatively, they can be used as general purpose

input/outputs. Two of the I/Os are open-drain outputs

and can thus be used to directly drive FETs or other

high-voltage applications.

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