PS401-I/SS Microchip Technology, PS401-I/SS Datasheet - Page 3

• Manufacturer Part Number: PS401-I/SS
• Description: IC FUEL GAUGE BATTERY MGR 28SSOP
• Manufacturer: Microchip Technology

Specifications of PS401-I/SS

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1.1
Figure 1-1 is an internal block diagram highlighting the
major architectural elements described below.
1.2
The PS401 incorporates an advanced, low power 8-bit
RISC microcontroller core. Memory resources include
12 Kbytes of OTP EPROM for program/data storage,
and 128 bytes of EEPROM for parameter storage.
1.3
The PS401 performs precise measurements of current,
voltage and temperature using a highly accurate 15-bit
integrating sigma-delta A/D converter. The A/D can be
calibrated to eliminate gain and offset errors and
incorporates an auto-zero offset correction feature that
can be performed while in the end system application.
1.4
Contained within the 12-Kbyte OTP is Microchip
developed
incorporates proprietary algorithms and sophisticated
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
functions 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 readily achievable.
The proprietary algorithms and 3D cell models are
contained within the 12-Kbyte on-chip One-Time-
Programmable (OTP) EPROM. Firmware upgrades
and customized versions can be rapidly created
without the need for silicon revisions.
The PS401 can be easily customized for a particular
application’s battery cell chemistry. Standard configura-
tion files are provided by Microchip for a wide variety of
popular
configurations.
 2003 Microchip Technology Inc.
Architectural Description
Microcontroller/Memory
A/D Converter
Microchip Firmware/Battery
Models
rechargeable
battery
management
cells
and
firmware
battery
pack
that
1.5
Communication with the host is fully compliant with the
industry standard Smart Battery System (SBS)
Specification. Included is an advanced SMBus
communications engine that is compliant with the
SMBus v1.1 Packet Error Checking (PEC) CRC-8 error
correction
processes all the revised Smart Battery Data (SBData)
v1.1 data values.
1.6
The PS401 provides a highly accurate RC oscillator
that provides accurate timing for self-discharge and
capacity calculations and eliminates the need for an
external crystal.
1.7
An integrated temperature sensor is provided to
minimize component count where the PS401 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 be
simultaneously monitored.
1.8
Eight programmable digital input/output pins are
provided by the PS401. These pins can be used as
LED outputs to display State-Of-Charge (SOC), or 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.
SMBus Interface/SBData
Commands
Accurate Integrated Time Base
Temperature Sensing
General Purpose I/O
protocols.
The
integrated
PS401
DS40238B-page 3
firmware