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Details, datasheet, quote on part number:PS3453
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Datasheet text preview:
Preliminary
PS3453 / PS3454 PS3453
Li Ion Smart Battery Manager Module with Safety
Features
· · · Standard sized modules for assembly into custom and standard sized battery packs Designed to work with 3cell (3453) and 4 cell (3454) series Li Ion configurations Performs all major Li Ion battery management functions including Accurate capacity monitoring Direct control of external charge circuitry (e.g. PWM) Direct control of secondary safety functions Six independently programmable output pins can be assigned as SOC LED outputs, direct charge control, or to control additional levels of safety Fully compliant with industry standard Smart Battery Data Specification V1.1a SMBus V1.1 with PEC / CRC-8 communication with system host High accuracy measurement of charge / discharge current, voltage, and temperature with on-chip 14-bit integrating A/D Precise capacity reporting using PowerSmart patented algorithms and 3D battery cell models 3D models and "learned" parameters stored in on board EEPROM; fully field reprogrammable via SMBus interface Extremely low power operation: Sleep Mode: < 10 uA typical Run Mode: < 500 uA typical Sample Mode < 250 uA typical Complete hardware and software development tools available
PCB Assembly
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Ordering Information
Pre-tested, fully assembled modules are available: PS3453 3 cell Li Ion battery pack PS3454 4 cell Li Ion battery pack
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Quick Start
Follow these directions to assemble a pack with the PS3450 module. § Use standard precautions when handling static sensitive devices. § Modules should be connected to battery cells in the order indicated below to insure proper start-up and operation. Wires should be attached to the modules first and then connected to the battery cells as instructed. § The connection sequence is critical to successful use of the PS331 family of CMOS ASICs. The negative cell string connection should always be connected first, followed by the cell string positive connection. The remaining connections can then be made after the pack negative and pack positive are securely connected to the module.
Updated 17 September 2000 Copyright PowerSmart, Inc., 2000
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PowerSmart PS3540 Module Data Sheet
PRELIMINARY
Step 1) Configure the module jumpers according to the following chart: Li Ion 3-cell Removed Installed Installed Li Ion 4-cell Installed Removed Removed
R27 R28 R30
Step 2) Connect wires to module. Use large diameter wire (18AWG-20 AWG) for current carrying lines from W1 and W5. All others are signal only lines (24 to 22 AWG). Step 3) Connect W1 (BN) to the most negative point on the battery cell stack. Step 4) Connect W5 (BP) to the most positive point on the battery cell stack. Step 5) Li Ion Only: Connect cell voltage pickups: 4 series cells - Vcell1 to W2, Vcell2 to W3, and Vcell3 W4 3 series cells Vcell1 to W3, Vcell2 to W4, No Conn at W2 Step 6) Connect external connector to B-Neg, T, C, D and B-Pos .
Updated 17 September 2000 Copyright PowerSmart, Inc., 2000
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PowerSmart PS3540 Module Data Sheet
PRELIMINARY
Step 7) Program the assembled pack using PowerSmart's SBTool software and calibration board or info board hardware and your *.p3I file. Default *.p3I files are available on the website (www.powersmart.com). Step 8) Calibrate the pack using the SBTool software and calibration board hardware. The pack is now ready for use.
General Description
The PS3450 module is a SBS V1.1 compliant smart battery controller. The module is designed to operate in a battery pack consisting of three (3) series connected Lithium Ion cells. The module consists of three major circuit sections - the PowerSmart PS334 SMBus fuel gauge, Mitsumi MM1414 based primary safety circuit and a secondary safety circuit controlled by the PS334 to provide backup to the MM1414.
Functional Description
P3 Fuel Gauge - The module fuel gauge provides State-of-Charge (SOC) and battery status data in accordance with the SBData and SMBus standards version 1.1. The PS334 monitors the three cell voltages, battery temperature, and current to determine SOC and battery status. The PS334 also provides remaining_time, terminate_charge, and terminate_discharge alarms when the battery is fully discharged, fully charged or is under conditions of over-temperature, over-voltage or overdischarge. The State-ofCharge calculations are compensated for cell self discharge. The remaining time calculation is compensated for temperature and discharge rate. An additional correction is made in the SOC for the estimated integration errors, reported as Max_Error. 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 `P3 Programming Guide" and the `PS334 Technical Data Sheet' for details on programming the P3 serial EEPROM data (programmable EEPROM data is capitalized in this text for clarity). Primary Safety -The primary safety circuit provides cell protection from conditions of overcharge, overdischarge and overcurrent. The analog IC MM1414D from Mitsumi measures individual cell voltages and voltage across the discharge FET. These measures are compared against internal reference values and the gates of two P-channel power MOSFETs are controlled based on the comparison results. Secondary Safety A secondary level of safety protection is provided by the Output3 (pin 23) and Output4 (pin 22) programmable outputs of the PS334. Output3 is programmed to provide backup overcharge protection and is activated in the case of pack overvoltage, overtemperature, or charge overcurrent. Output4 is programmed to provide backup overdischarge protection and is activated in the case of cell undervoltage, overtemperature, undertemperature, or discharge overcurrent. For both of these outputs, in the situation where the parameter being monitored is the same as that of the MM1414 the limits are set beyond those of the MM1414. This means that the secondary protection is triggered only in the event the primary protection fails to activate. Ultimate Safety The third level of safety protection is activated by Output5 (pin 21) of the PS334. This pin is activated whenever any individual cell voltage is measured above a programmable limit that is beyond both the primary and secondary safety limits. An N-channel MOSFET is thus turned on and allows current to pass through the resistive heater section of a fuse. This heating opens the fuse, permanently disabling the pack from further charge or discharge. Programmable outputs The PS3450 features three user configurable outputs with connections available at the top edge of the board. These are connected to Output1 (pin 25), Output2 (pin 24) and Output6 (pin 19) of the PS334.
Updated 17 September 2000 Copyright PowerSmart, Inc., 2000
3
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