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X3101 Dataheets PDF



Part Number X3101
Manufacturers Xicor
Logo Xicor
Description 3 or 4 Cell Li-Ion Battery Protection and Monitor IC
Datasheet X3101 DatasheetX3101 Datasheet (PDF)

APPLICATION NOTE A V A I L A B L E 3 or 4 Cell Li-Ion BATTERY PACKS Preliminary Information Preliminary X3100/X3101 FEATURE • Software Selectable Protection Levels and Variable Protect Detection/Release Times • Integrated FET Drive Circuitry • Cell Voltage and Current Monitoring • 0.5% Accurate Voltage Regulator • Integrated 4kbit EEPROM • Flexible Power Management with 1µA Sleep Mode • Cell Balancing Control BENEFIT 4 cell / 3 cell 3 or 4 Cell Li-Ion Battery Protection and Monitor IC • Opt.

  X3101   X3101


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APPLICATION NOTE A V A I L A B L E 3 or 4 Cell Li-Ion BATTERY PACKS Preliminary Information Preliminary X3100/X3101 FEATURE • Software Selectable Protection Levels and Variable Protect Detection/Release Times • Integrated FET Drive Circuitry • Cell Voltage and Current Monitoring • 0.5% Accurate Voltage Regulator • Integrated 4kbit EEPROM • Flexible Power Management with 1µA Sleep Mode • Cell Balancing Control BENEFIT 4 cell / 3 cell 3 or 4 Cell Li-Ion Battery Protection and Monitor IC • Optimize protection for chosen cells to allow maximum use of pack capacity. • Reduce component count and cost • Simplify implementation of gas gauge • Accurate voltage and current measurements • Record battery history to optimize gas gauge, track pack failures and monitor system use • Reduce power to extend battery life • Increase battery capacity and improve cycle life battery life Using an internal analog multiplexer, the X3100 or X3101 allow battery parameters such as cell voltage and current (using a sense resistor) to be monitored externally by a separate microcontroller with A/D converter. Software on this microcontroller implements gas gauge and cell balancing functionality in software. The X3100 and X3101 contain a current sense amplifier. Selectable gains of 10, 25, 80 and 160 allow an external 10 bit A/D converter to achieve better resolution than a more expensive 14 bit converter. An internal 4kbit EEPROM memory featuring IDLock™, allows the designer to partition and “lock in” written battery cell/pack data. The X3100 and X3101 are each housed in a 28 Pin TSSOP package. DESCRIPTION The X3100 is a protection and monitor IC for use in battery packs consisting of 4 series Lithium-Ion battery cells. The X3101 is designed to work in 3 cell applications. Both devices provide internal overcharge, over-discharge, and over-current protection circuitry, internal EEPROM memory, an internal voltage regulator, and internal drive circuitry for external FET devices that control cell charge, discharge, and cell voltage balancing. Over-charge, over-discharge, and over-current thresholds reside in an internal EEPROM memory register and are selected independently via software using a 3MHz SPI serial interface. Detection and timeout delays can also be individually varied using external capacitors. FUNCTIONAL DIAGRAM VCC RGP RGC RGO UVP/OCP OVP/LMON AS0 AS1 AS2 AO VCELL1 CB1 VCELL2 CB2 VCELL3 CB3 VCELL4/VSS CB4 Over-charge Over-discharge Protection Sense Circuits Protection Sample Rate Timer 5VDC Regulator Internal Voltage Regulator Power On reset & Status Register FET Control Circuitry Analog MUX 4 kbit EEPROM Over-current Protection & Current Sense Protection Circuit Timing Control & Configuration OVT UVT OCT Configuration Register Control Register S0 SPI I/F SCK CS SI VSS VCS1 VCS2 REV 1.1.8 12/10/02 www.xicor.com Characteristics subject to change without notice. 1 of 40 X3100/X3101 – Preliminary Information PRINCIPLES OF OPERATION The X3100 and X3101 provide two distinct levels of functionality and battery cell protection: First, in Normal mode, the device periodically checks each cell for an over-charge and over-discharge state, while continuously watching for a pack over-current condition. A protection mode violation results from an over-charge, over-discharge, or over-current state. The thresholds for these states are selected by the user through software. When one of these conditions occur, a Discharge FET or a Charge FET or both FETs are turned off to protect the battery pack. In an overdischarge condition, the X3100 and X3101 devices go into a low power sleep mode to conserve battery power. During sleep, the voltage regulator turns off, removing power from the microcontroller to further reduce pack current. Second, in Monitor mode, a microcontroller with A/D converter measures battery cell voltage and pack current via pin AO and the X3100 or X3101 on-board MUX. The user can thus implement protection, charge/discharge, cell balancing or gas gauge software algorithms to suit the specific application and characteristics of the cells used. While monitoring these voltages, all protection circuits are on continuously. In a typical application, the microcontroller is also programmed to provide an SMBus interface along with the Smart Battery System interface protocols. These additions allow an X3100 or X3101 based module to adhere to the latest industry battery pack standards. PIN CONFIGURATION 28 Lead TSSOP VCELL1 CB1 VCELL2 CB2 VCELL3 CB3 VCELL4/VSS* CB4 VSS VCS1 VCS2 OVT UVT OCT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 X3100/ X3101 22 21 20 19 18 17 16 15 VCC RGP RGC RGO UVP/OCP OVP/LMON CS SCK SO SI AS2 AS1 AS0 AO PIN NAMES Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Symbol CB1 CB2 CB3 Description Cell balancing FET control output 1 Cell balancing FET control output 2 Cell balancing FET control output 3 VCELL1 Battery cell 1 voltage input VCELL2 Battery cell 2 .


X3100 X3101 X40010


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