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Details, datasheet, quote on part number:X3101
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| Part: | X3101 |
| Category: | Power Management => Battery Management |
| Description: | 3 or 4 Cell Li-ion Battery Protection And Monitor ic |
| Company: | Xicor, Inc. |
| Datasheet: | Download X3101 datasheet File size : 254 kB |
| Request For quote: | Find where to buy X3101
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Datasheet text preview:
APPLICATION NOTE A V A I LABLE
3 or 4 Cell Li-Ion BATTERY PACKS
Preliminary Preliminary Information
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 conver ter. 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 IDLockTM, 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 1.1.6 11/14/01
www.xicor.com
Characteristics subject to change without notice.
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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 voltage VCELL3 Battery cell 3 voltage VCELL4/ Battery cell 4 voltage (X3100) VSS Ground (X3101) CB4 VSS VCS1 VCS2 OVT UVT OCT AO AS0 AS1 AS2 SI SO SCK CS OVP/ LMON UVP/ OCP RGO RGC RGP VCC Cell balancing FET control output 4 Ground Current sense voltage pin 1 Current sense voltage pin 2 Over-charge detect/release time input Over-discharge detect/release time input Over-current detect/release time input Analog multiplexer output Analog output select pin 0 Analog output select pin 1 Analog output select pin 2 Serial data input Serial data output Serial data clock input Chip select input pin Over-charge Voltage Protection output/ Load Monitor output Over-discharge protection output/ Over-current protection output Voltage regulator output pin Voltage regulator control pin Voltage regulator protection pin Power supply
PIN DESCRIPTIONS Battery Cell Voltage (VCELL1-VCELL4): These pins are used to monitor the voltage of each battery cell internally. The voltage of an individual cell can also be monitored externally at pin AO. The X3100 monitors 4 battery cells. The X3101 monitors 3 battery cells. For the X3101 device connect the VCELL4/VSS pin to ground. www.xicor.com
Characteristics subject to change without notice.
*For X3101, Connect to ground.
REV 1.1.6 11/14/01
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X3100/X3101 Preliminary Information
Cell Voltage Balancing Control (CB1-CB4): These outputs are used to switch external FETs in order to perform cell voltage balancing control. This function can be used to adjust individual cell voltages (e.g. during cell charging). CB1CB4 can be driven high (Vcc) or low (Vss) to switch external FETs ON/OFF. When using the X3101, the CB4 pin can be left unconnected, or the FET control can be used for other purposes. Current Sense Inputs (VCS1VCS2): A sense resistor (RSENSE) is connected between VCS1 and VCS2 (Figure 1). RSENSE has a resistance in the order of 20m to 100m, and is used to monitor current flowing through the battery terminals, and protect against over-current conditions. The voltage at each end of RSENSE can also be monitored at pin AO. Over-charge Voltage detect Time control (OVT): This pin is used to control the delay time (TOV) associated with the detection of an over-charge condition (see section "Over-charge Protection" on page 13). Over-discharge detect/release time control (UVT): This pin is used to control the delay times associated with the detection (TUV) and release (TUVR) of an overdischarge (under-voltage) condition (see section "Overdischarge Protection" on page 15). Over-current detect/release time control (OCT): This pin is used to control the delay times associated with the detection (TOC) and release (TOCR) of an overcurrent condition (see section "Over-Current Protection" on page 18). Analog Output (AO): The analog output pin is used to externally monitor various battery parameter voltages. The voltages which can be monitored at AO (see section "Analog Multiplexer Selection" on page 20) are: Individual cell voltages Voltage across the current sense resistor (RSENSE). This voltage is amplified with a gain set by the user in the control register (see section "Current Monitor Function" on page 20.) The analog select pins pins AS0AS2 select the desired voltage to be monitored on the AO pin. Analog Output Select (AS0AS2): These pins select which voltage is to be multiplexed to the output AO (see section "Sleep Control (SLP)" on page 10 and section "Current Monitor Function" on page 20) Serial Input (SI): SI is the serial data input pin. All opcodes, byte addresses, and data to be written to the device are input on this pin. Serial Output (SO): SO is a push/pull serial data output pin. During a read cycle, data is shifted out on this pin. Data is clocked out by the falling edge of the serial clock. While CS is HIGH, SO will be in a High Impedance state. Note: SI and SO may be tied together to form one line (SI/SO). In this case, all serial data communication with the X3100 or X3101 is undertaken over one I/O line. This is permitted ONLY if no simultaneous read/write operations occur. Serial Clock (SCK): The Serial Clock controls the serial bus timing for data input and output. Opcodes, addresses, or data present on the SI pin are latched on the rising edge of the clock input, while data on the SO pin change after the falling edge of the clock input. Chip Select (CS): When CS is HIGH, the device is deselected and the SO output pin is at high impedance. CS LOW enables the SPI serial bus. Over-charge Voltage Protection/Load Monitor (OVP/LMON): This one pin performs two functions depending upon the present mode of operation of the X3100 or X3101. --Over-charge Voltage Protection (OVP) This pin controls the switching of the battery pack charge FET. This power FET is a P-channel device. As such, cell charge is possible when OVP/LMON=VSS, and cell charge is prohibited when OVP/LMON=VCC. In this configuration the X3100 and X3101 turn off the charge voltage when the cells reach the over-charge limit. This prevents damage to the battery cells due to the application of charging voltage for an extended period of time (see section "Over-charge Protection" on page 13).
REV 1.1.6 11/14/01
www.xicor.com
Characteristics subject to change without notice.
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