PS5162

DS21842B-page 4

 2004 Microchip Technology Inc.

2.0

FUNCTIONAL DESCRIPTION

2.1

PS501 Fuel Gauge

The module fuel gauge provides State-Of-Charge

(SOC) and battery status data in accordance with the

SMBus standards version 1.1. The PS501 monitors the

cell voltages, battery temperature and current to deter-

mine SOC and battery status. The State-Of-Charge

calculations are compensated for cell self-discharge.

The remaining time calculation is compensated for

temperature and discharge rate. The parameters for

determining battery status flags and alarm thresholds

are all programmable, as is the battery design capacity

and the battery performance model data. Please refer

to the “PS501 Data Sheet” (DS21818) for details on

configuring the PS501 device.

2.2

Primary Safety

The primary safety circuit provides cell protection from

conditions of overcharge, overdischarge and over-

current. The analog safety IC measures individual cell

voltages, current and voltage across the safety FETs.

These values are compared against internal reference

values and the gates of two N-channel power

MOSFETs are controlled based on the comparison

results.

3.0

BOARD DESCRIPTION

PCB schematics and bill of materials are included here

for completeness. To download the full size schematic

and BOM, please visit the Microchip web site.

3.1

Mechanical Dimensions

Overall Dimensions: 2165 mils x 339 mils