BQ2084DBTR-V123

bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 SBS v1.1 COMPLIANT GAS GAUGE FOR USE WITH THE bq29312 FEATURES • • • • • • • • • • • Provides Accurate Measurement of Available Charge in Li-Ion and Li-Polymer Batteries Supports the Smart Battery Specification (SBS) V1.1 Integrated Time Base Eliminates Need for External Crystal – Optional Crystal input Works With the TI bq29312 Analog Front End (AFE) Protection IC to Provide Complete Pack Electronics for 7.2-V, 10.8-V or 14.4-V Battery Packs With Few External Components Powerful RISC CPU Core With High-Performance Peripherals, Low Power Consumption Integrated FLASH Memory Eliminates the Need for External Configuration EEPROM Uses 16-Bit Delta Sigma Converter for Accurate Voltage and Temperature Measurements Measures Charge Flow Using a High Resolution 16-Bit Integrating Converter – Better Than 0.65-nVh of Resolution – Self-Calibrating – Offset Error Less Than 1-µV Programmable Cell Modeling for Maximum Battery Fuel Gauge Accuracy Drives 3-, 4-, or 5-Segment LED Display for Remaining Capacity Indication Available in a 38-Pin TSSOP (DBT) Package APPLICATIONS • • • Notebook PCs Medical and Test Equipment Portable Instrumentation DESCRIPTION The bq2084-V123 SBS-compliant gas gauge IC for battery pack or in-system installation maintains an accurate record of available charge in Li-ion or Li-polymer batteries. The bq2084-V123 monitors capacity and other critical parameters of the battery pack and reports the information to the system host controller over a serial communication bus. It is designed to work with the bq29312 analog front-end (AFE) protection IC to maximize functionality and safety and minimize component count and cost in smart battery circuits. Using information from the bq2084-V123, the host controller can manage remaining battery power to extend the system run time as much as possible. The bq2084-V123 uses an integrating converter with continuous sampling for the measurement of battery charge and discharge currents. Optimized for coulomb counting in portable applications, the self-calibrating integrating converter has a resolution better than 0.65-nVh and an offset measurement error of less than 1-µV (typical). For voltage and temperature reporting, the bq2084-V123 uses a 16-bit A-to-D converter. In conjunction with the bq29312, the onboard ADC also monitors the pack and individual cell voltages in a battery pack and allows the bq2084-V123 to generate the control signals necessary to implement the cell balancing and the required safety protection for Li-ion and Li-polymer battery chemistries. The bq2084-V123 supports the Smart Battery Data (SBData) commands and charge-control functions. It communicates data using the System Management Bus (SMBus) 2-wire protocol. The data available include the battery's remaining capacity, temperature, voltage, current and remaining run-time predictions. The bq2084-V123 provides LED drivers and a push-button input to depict remaining battery capacity from full to empty in 20%, 25%, or 33% increments with a 3-, 4-, or 5-segment display. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2004–2005, Texas Instruments Incorporated bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. DESCRIPTION (CONTINUED) The bq2084-V123 contains 1k bytes of internal data flash memory, which store configuration information. The information includes nominal capacity and voltage, self-discharge rate, rate compensation factors, and other programmable cell-modeling factors used to accurately adjust remaining capacity for use-conditions based on time, rate, and temperature. The bq2084-V123 also automatically calibrates or learns the true battery capacity in the course of a discharge cycle from programmable near full to near empty levels. The bq29312 analog front-end (AFE) protection IC is used to maximize functionality and safety and minimize component count and cost in smart battery circuits. The bq29312 AFE protection IC provides power to the bq2084-V123 from a 2, 3 or 4 series Li-ion cell stack, eliminating the need for an external regulator circuit. ORDERING INFORMATION PACKAGE TA 38-PIN TSSOP (DBT) bq2084DBT-V123 (1) –20°C to 85°C (1) The bq2084-V123 is available taped and reeled. Add an R suffix to the device type (e.g., bq2084DBTR-V123) to order tape and reel version. ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range unless otherwise noted (1) UNIT Supply voltage range, VDD relative to VSS (2) Open-drain I/O pins, V(IOD) relative to VSS (2) Input voltage range to all other pins, VI relative to VSs (2) –0.3 V to 4.1 V –0.3 V to 6 V –0.3 V to VDD + 0.3 V TA Operating free-air temperature range –20°C to 85°C Tstg Storage temperature range –65°C to 150°C (1) (2) 2 Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. VSS refers to the common node of V(SSA), V(SSD), and V(SSP). bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 ELECTRICAL CHARACTERISTICS VDD = 3.0 V to 3.6 V, TA = –20°C to 85°C unless otherwise noted PARAMETER VDD TEST CONDITIONS Supply voltage VDDA and VDDD IDD Operating mode current No flash programming or LEDs active I(SLP) Low-power storage mode current Sleep mode VOL VIL VIH MIN TYP MAX 3.0 3.3 3.6 380 8 µA 0.4 LED1-LED5 0.4 IOL = 10 mA Input voltage low SMBC, SMBD, SDATA, SCLK, EVENT, PU, PRES, PFIN –0.3 0.8 DISP –0.3 0.8 Input voltage high SMBC, SMBD, SDATA, SCLK, EVENT, PU, PRES, PFIN 2 6 DISP 2 VDD + 0.3 Input voltage range VIN, TS V(AI2) Input voltage range SR1, SR2 Z(AI1) Input impedance SR1, SR2 –0.25 V to 0.25 V Z(AI2) Input impedance VIN, TS 0 V–1.0 V V µA Output voltage low SMBC, SMBD, SDATA, SCLK, SAFE, PU IOL = 0.5 mA V(AI1) UNIT VSS – 0.3 1.0 VSS – 0.25 0.25 V V V V V 2.5 MΩ 8 MΩ POWER-ON RESET Negative-going voltage input 2.1 2.3 2.5 V Vhys Power-on reset hysteresis 50 125 200 mV POWER ON RESET BEHAVIOR vs FREE-AIR TEMPERATURE 2.50 140 2.45 135 2.40 130 VIT- 2.35 125 2.30 120 2.25 115 Vhys 2.20 110 2.15 105 2.10 -20 -10 V hys - Hysterisis Voltage - mV V IT - Negative Going Input Threshold Voltage - V VIT+ 100 0 10 20 30 40 50 60 70 80 TA - Free-Air Temperature - °C INTEGRATING ADC CHARACTERISTICS VDD = 3.0 V to 3.6 V, TA = –20°C to 85°C unless otherwise noted PARAMETER V(SR) Input voltage range, V(SR2) and V(SR1) V(SROS) Input offset INL Integral nonlinearity error TEST CONDITIONS VSR = V(SR2)– V(SR1) MIN TYP –0.25 MAX UNIT 0.25 V 1 FAST = 0, –0.1 V to 0.8 x Vref 0.004% mV 0.018% PLL SWITCHING CHARACTERISTICS VDD = 3.0 V to 3.6 V, TA = –20°C to 85°C unless otherwise noted PARAMETER t(SP) (1) Start-up time (1) TEST CONDITIONS ±0.5% frequency error MIN TYP MAX 2 5 UNIT ms The frequency error is measured from the trimmed frequency of the internal system clock, which is 128 x oscillator frequency, nominally 4.194 MHz. 3 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 OSCILLATOR VDD = 3.0 V to 3.6 V, TA = –20°C to 85°C (unless otherwise noted) (TYP: VDD = 3.3 V, TA = 25°C) PARAMETER f(eio) Frequency error from 32.768 kHz f(dio) Frequency f(sio) f(sxo) (1) (2) TEST CONDITIONS ROSC = 100k XCK1 = 12 pF XTAL drift (1) ROSC = 100k, TA = 0°C to 50°C Start-up time (2) MIN TYP MAX –2% 0.5% 2% –0.25% UNIT 0.25% –1% 1% ROSC = 100k 200 µs XCK1 = 12 pF XTAL 250 ms The frequency drift is measured from the trimmed frequency at VDD = 3.3 V, TA = 25°C. The start-up time is defined as the time it takes for the oscillator output frequency to be ±1% DATA FLASH MEMORY CHARACTERISTICS VDD = 3.0 V to 3.6 V, TA = –20°C to 85°C unless otherwise noted PARAMETER tDR TEST CONDITIONS TYP MAX UNIT See (1) 10 Years Flash programming write-cycles See (1) 20k Cycles t(WORDPROG) Word programming time See (1) I(DDPROG) Flash-write supply current See (1) (1) MIN Data retention 8 2 ms 12 mA Assured by design. Not production tested. REGISTER BACKUP PARAMETER I(RBI) RBI data-retention input current V(RBI) RBI data-retention voltage (1) TEST CONDITIONS MIN TYP MAX VRBI > 2.0 V, VDD < VIT (1) 10 100 1.3 UNIT nA V Specified by design. Not production tested. SMBus TIMING SPECIFICATIONS VDD = 3.0 V to 3.6 V, TA = -20°C to 85°C unless otherwise noted PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 10 100 kHz f(SMB) SMBus operating frequency Slave mode, SMBC 50% duty cycle f(MAS) SMBus master clock frequency Master mode, no clock low slave extend t(BUF) Bus free time between start and stop 4.7 µs T(HD:STA) Hold time after (repeated) start 4.0 µs t(SU:STA) Repeated start setup time 4.7 µs t(SU:STO) Stop setup time 4.0 µs t(HD:DAT) Data hold time tSU:DAT) Data setup time t(TIMEOUT) Error signal/detect t(LOW) Clock low period Receive mode 0 Transmit mode 300 (1) Clock high period See tLOW:SEXT) Cumulative clock low slave extend time See (3) tLOW:MEXT Cumulative clock low master extend time See (4) tf Clock/data fall time (VILMAX – 0.15 V) to (VIHMIN + 0.15 V) tr Clock/data rise time 0.9 VDD to (VILMAX– 0.15 V) 4 ns 25 ns 35 4.7 t(HIGH) (3) (4) kHz 250 See (2) (1) (2) 51.2 4.0 ms µs 50 µs 25 ms 10 ms 300 ns 1000 ns The bq2084-V123 times out when any clock low exceeds t(TIMEOUT). t(HIGH) Max. is minimum bus idle time. SMBC = 1 for t > 50 ms causes reset of any transaction involving bq2084-V123 that is in progress. t(LOW:SEXT) is the cumulative time a slave device is allowed to extend the clock cycles in one message from initial start to the stop. t(LOW:MEXT) is the cumulative time a master device is allowed to extend the clock cycles in one message from initial start to the stop. bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 SMBus TIMING DIAGRAMS SYSTEM DIAGRAM Discharge / Charge / Pre-Charge FETs Fuse Pack + Pre-Charge Control Pres bq29312 PF Input Fail-Safe Protection PCH FET Drive Power Management LDO, TOUT and Power Mode Control 3.3 V Temperature Measurement TINT V(cell)OV x n - V(charge) where: n = number of series cells. When charging begins on a depleted battery pack, the voltage is below Voff, and may even stay below Von for some time. This means the pack is under constant charge, with no pulsing, for some part of the charge cycle. As the voltage on the cells rises, it crosses the Voff theshold (or the Vmax threshold if Voff is disabled), and the charge FET turns off. Initially, the off time is short, since the cells are only barely over the threshold and is quickly relaxed to below Von. As the cell voltages rises, the off times become longer and the on times shorter. This effect, in combination with the reduced current drawn by the cells, results in a gradually declining charge current. Eventually, this current falls below the taper current, and the pack detects the full charge condition and stops charging. The pulse-charging control operates during normal charging conditions and are overridden in case of a fault condition. Charging is stopped for any fault conditions which may occur, such as overtemperature or overcurrent, without regard to the voltage thresholds or time limits. Primary Charge Termination The bq2084-V123 terminates charge if it detects a charge-termination condition based on current taper. A charge-termination condition includes the following: 17 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 The bq2084-V123 detects a current taper termination when the pack voltage is greater than Charging Voltage (DF 0x3a-0x3b) minus Current Taper Qualification Voltage (DF 0x4d-0x4e) and the AverageCurrent() is below the Current Taper Threshold (DF 0x4b-0x4c), but greater than the Charge Detection Current (DF 0x113-0x114), for a period of Current Taper Window (DF 0x4f). Once the bq2084-V123 detects a Primary Charge Termination, the bq2084-V123 sets the TERMINATE_CHARGE_ ALARM and FULLY_CHARGED bits in BatteryStatus(), and turns off the charge FET via the bq29312. The charge FET is turned on when discharge current is detected and is greater than Discharge Detection Current (DF 0x115-0x116), to minimize IR losses. The TERMINATE_CHARGE_ ALARM charge current is no longer detected or the pack is removed, but returns if charging is attempted while the FULLY_CHARGED bit is set. The bq2084-V123 clears the FULLY_CHARGED and TERMINATE_CHARGE_ALARM bit when RelativeStateOfCharge() is less than the programmed Fully Charged Clear %. See Table 13 for a summary of BatteryStatus() alarm and status bit operation. Cell Balancing The bq2084-V123 balances the cells during charge by discharging those cells above the threshold set in Cell Balance Threshold (DF 0xe8-0xe9), if the maximum difference in cell voltages exceeds the value programmed in Cell Balance Min (DF 0xec). For cell balancing, the bq2084-V123 measures the cell voltages at an interval set in Cell Balance Interval (DF 0xed). On the basis of the cell voltages, the bq2084-V123 either selects the appropriate cell to discharge or adjusts the cell balance threshold up by the value programmed in Cell Balance Window (DF 0xea-0xeb) when all cells exceed the cell balance threshold or the highest cell exceeds the cell balance threshold by the cell balance window. Cell balancing only occurs when charging current is detected and the cell balance threshold is reset to the value in Cell Balance Threshold at the start of every charge cycle. The threshold is only adjusted once during any balance interval. If the cells are severely imbalanced during charging, where VCELL(MAX) - VCELL(MIN) > Cell Imbalance Threshold AND SBS Current() > Balance IMAX for a period of Cell Imbalance time then the CIM bit in PF Status is set. Table 6. Cell Balancing and Cell Imbalance Programming NAME DF ADDRESS DESCRIPTION Cell Balance Threshold 0xe8-0xe9 Sets the maximum voltage in mV that each cell must achieve to initiate cell balancing. Programming Cell Balance Threshold to 65,535 disables cell balancing. Cell Balance Min 0xec Sets in mV the cell differential that must exist to initiate cell balancing Cell Balance Window 0xea-0xeb Sets in mV the amount that the cell balance threshold increases during cell balancing Cell Balance Interval 0xed Sets the cell balancing time interval in seconds. Cell Imbalance Threshold 0xee-0xef Sets the severe imbalance fault limit for cell imabalance detection Balance IMAX 0xf2-0xf3 Sets the charge current required to allow a cell imbalance to be detected Cell Imbalance Time 0x134 Sets the time period during which a cell imbalance must be selected for the bq2084 to enter PF mode. DISPLAY PORT General The display port drives a 3-, 4-, or 5-LED bar-graph display. The display is activated by a logic signal on the DISP input. The bq2084-V123 can display RM in either a relative or absolute mode with each LED representing a percentage of the full-battery reference. In relative mode, the bq2084-V123 uses FCC as the full-battery reference; in absolute mode, it uses Design Capacity (DC). The DMODE bit in Pack Configuration (DF 0x28) programs the bq2084-V123 for the absolute or relative display mode. The LED bits program the 3-, 4-, or 5-LED option. 18 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 Activation The display may be activated at any time by a high-to-low transition on the DISP input. This is usually accomplished with a pullup resistor and a pushbutton switch. Detection of the transition activates the display and starts a 4-s display timer. Reactivation of the display requires that the DISP input return to a logic-high state and then transition low again. The second high-to-low transition can be detected only after the display timer expires. If unused, the DISP input must be pulled up to VCC. If the EDV0 bit is set, the bq2084-V123 disables the LED display. Display Modes In relative mode, each LED output represents 20%, 25%, or 33% of the RelativeStateOfCharge() value. In absolute mode, each LED output represents 20%, 25% or 33% of the AbsoluteStateOfCharge() value. Table 7 shows the display options for 5 LEDs for 4 LEDs, Table 8 and Table 9 for 3 LEDs. In either mode, the bq2084-V123 blinks the LED display if RemainingCapacity() is less than Remaining CapacityAlarm(). The display is disabled if EDV0 = 1. Table 7. Display Mode for Five LEDs CONDITION RELATIVE OR ABSOLUTE FIVE-LED DISPLAY OPTION StateOfCharge() LED1 LED2 LED3 LED4 LED5 EDV0 = 1 OFF OFF OFF OFF OFF charge detection current (DF 0x113/4) GG Charge OC (set by DF 0x12a to 0x12c) CHG off, ZVCHG off, DSG on Same AFE SCC GG Discharge OC (set by DF 0x12d to 0x12f) CHG on, ZVCHG off, DSG off Same AFE SCD NR = 0 FAILURE FET STATUS EXIT CONDITIONS AFE OLV All FETs off RRES = high AFE SCC All FETs off PRES = high AFE SCD All FETs off PRES = high GG Charge OC (set by DF 0x12a to 0x12c) All FETs off PRES = high GG Discharge OC (set by DF 0x12d to 0x12f) All FETs off PRES = high AFE Integrity Check The bq2084-V123 checks the programming of the AFE registers at a period determined by AFE Check Time (DF 0xfb). The units of the check period are seconds unless the bq2084-V123 is in sleep mode, in which case the period is AFE Check Time x Sleep Current Multiplier (DF 0xfd). If the data is not correct, the bq2084-V123 increments an internal counter until it reaches the AFE Fail Limit (DF 0xe4). Setting AFE Check Time to 0 disables this function. When the internal AFE Fail counter reaches AFE Fail Limit, then the AFE bit in PF Status is set. AFE Watchdog Fault and Clear The bq29312 has a feature where the 32 kHz output (CLKOUT, pin 35) of the bq2084-V123 is used to drive its internal clock. If this clock fails, a fault is declared in the AFE. See the bq29312 data sheet for further details. The fault is cleared automatically on return of the 32-kHz input via the bq2084-V123 CLKOUT pin. Permanent Failure Mode (SAFE Output) The SAFE output of the bq2084-V123 provides an additional level of safety control. The active low safety output can blow a fuse or control another switch on the basis of temperature, pack-voltage cell-voltage, CHG FET Failure, severe cell imbalance or an integrity check of the AFE and Data Flash configuration registers. The bq2084-V123 can also activate the SAFE output and set the PF Flag based on the PFIN input. If this pin is low for PFIN Time seconds ±1 s then the PFIN bit in PF Status is set. 21 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 The SAFE output can be driven low in any of the following conditions and the bq2084-V123 sets the PF Flag register (DF 0x11e) to 0x66 (011001100). The activation of the SAFE output and the setting of the PF Flag can be enabled or disabled for different safety option per the PF Config (DF 0x11f) register settings. The SAFE output and PF Flag register can only be cleared using a series of ManufacturerAccess() commands. Table 12. SAFE Activation Conditions (1) CONDITION ACTIONS Voltage() > Safety Over Voltage (DF 0x6b and 0x6c), SOV and PF set Temperature() > Safety Over Temperature in Charge (DF 0x75 and 0x76) SOTC and PF set Temperature() > Safety Over Temperature in Discharge (DF 0x77 and 0x78) SOTD and PF set When Miscellaneous Configuration (0x2a) bit 13 AC is set, and the number of AFE failures has reached the AFE Fail Limit (DF 0xe4) AFE and PF set When VCELL(MAX) - VCELL(MIN) > Cell Imbalance Threshold (DF 0xee, 0xef) during charging CIM and PF set If charge FET is off, and charge current greater than FET Fail charge current stored in DF 0x125-0x126 for the time determined by FET Fail time in DF 0x129, or if discharge FET is off and discharge current greater than FET Fail discharge current stored in DF 0x127-0x128 for the time determined by FET Fail time in DF 0x129. The PFIN input has detected a low state for PFIN Time in consecutive seconds, as determined by DF 0x120 (1) FETF and PF set PFIN, PF set SAFE output activated and PF Flag set only if enabled by PF Config (DF 0x0x11f) Permanent Failure Status (PF Status) PF Status DF 0x11d contains the flags for the cause of the permanent failure mode. b7 b6 b5 b4 b3 b2 b1 b0 PFF PFIN FETF CIM AFE SOTD SOTC SOV SOV The SOV bit indicates a safety overvoltage occurred which if enabled by PF Config would cause the SAFE output to activate. 0 SOV fault not detected (default) 1 SOV fault detected SOTC The SOTC bit indicates a safety overtemperature in charge occurred which if enabled by PF Config would cause the SAFE output to activate. 0 SOTC fault not detected (default) 1 SOTC fault detected SOTD The SOTD bit indicates a safety overtemperature in discharge occurred which if enabled by PF Config would cause the SAFE output to activate. 0 SOTD fault not detected (default) 1 SOTD fault detected AFE The AFE bit indicates an AFE integrity fault state occurred which if enabled by PF Config would cause the SAFE output to activate. 22 0 AFE is operating correctly (default) 1 AFE Integrity check fail limit reached bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 CIM The CIM bit indicates that a severe cell imbalance occurred during charging, which if enabled by PF Config, would cause the SAFE output to activate. 0 All cells are within the Cell Imbalance Threshold (default) 1 There is a severe cell imbalance FETF The FETF bit indicates a FET or FET driver failure occurred, which if enabled by PF Config would cause the SAFE output to activate. 0 The FETs are operating normally (default) 1 The FETs or FET drivers have a fault PFIN The PFIN bit is used to indicate that the output of the 2nd level protector has activated. 0 The PFIN input is high (default) 1 The PFIN input drive and held low by 2nd level protector output FPP The PFF bit is used to indicate that current has been detected when the fuse has been set to be blown. 0 Current not detected with fuse blown 1 Current detected with fuse blown Permanent Failure Configuration (PF Config) PF Config (DF 0x11f) contains the enable/disable configuration that determines if the SAFE output is activated and the PF Flag set for each possible failure mode. b7 b6 b5 b4 b3 b2 b1 b0 - XPFIN XFETF XCIM XAFE XSOTD XSOTC XSOV XSOV The XSOV bit enables or disables the activation of SAFE and the setting of the PF Flag when PF Status SOV is set. 0 Activation disabled (default) 1 Activation enabled XSOTC The XSOTC bit enables or disables the activation of SAFE and the setting of the PF Flag when PF Status SOTC is set. 0 Activation disabled (default) 1 Activation enabled XSOTD The XSOTD bit enables or disables the activation of SAFE and the setting of the PF Flag when PF Status SOTD is set. 0 Activation disabled (default) 1 Activation enabled XAFE The XAFE bit enables or disables the activation of SAFE and the setting of the PF Flag when PF Status AFE is set. Bit 13 of Miscellaneous Config DF 0x2a also needs to be set for activation. 23 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 0 Activation disabled (default) 1 Activation enabled SCIM The XCIM bit enables or disables the activation of SAFE and the setting of the PF Flag when PF Status CIM is set. 0 Activation disabled (default) 1 Activation enabled XFETF The XFETF bit enables or disables the activation of SAFE and the setting of the PF Flag when PF Status FETF is set. 0 Activation disabled (default) 1 Activation enabled XPFIN The XPFIN bit enables or disables the activation of SAFE and the setting of the PF Flag when PF Status PFIN is set. 0 Activation disabled (default) 1 Activation enabled Permanent Failure Flag (PF Flag) PF Flag (DF 0x11e) contains the flag indicating if the /SAFE output has been activated. STATE b7 b6 b5 b4 b3 b2 b1 b0 Clear 0 0 0 0 0 0 0 0 Set 0 1 1 0 0 1 1 0 PF FLAG The PF Flag indicates that the SAFE output of the bq2084-V123 has been activated. 0x00 SAFE output high (default) 0x66 SAFE output activated An example circuit using the SAFE output to blow a fuse is shown in Figure 2. Figure 2. Example SAFE Circuit Implementation 24 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 Low-Power Modes The bq2084-V123 enters sleep mode when the charge and discharge current is less than the threshold programmed in Sleep Current Threshold (DF 0xfc), the SMBus lines are low for at least 2s, and bit 12 of Misc. Configuration (DF 0x2a) is set to zero. Additionally, PRES must be pulled high if the NR bit in Misc Config is set to 0. The bq2084-V123 wakes up periodically to monitor voltage and temperature and to apply self-discharge adjustment. The sleep period is set in Sleep Timer (DF 0xfe). The bq2084-V123 wakes up at a period set by Sleep Current Multiplier (DF 0xfd) multiplied by Sleep Time to measure current. The bq2084-V123 comes out of sleep when either of the SMBus lines go high or when the current is measured and it is greater than the Sleep Current Threshold. The sleep current threshold, SLP (mA), is stored in Sleep Current Thresh (DF 0xfc) as: Sleep Current Thresh = SLP(mA) ÷ 0.5 The wake-up period for current measurement, WAT(s), is set using the following formula: Sleep Current Multiplier x Sleep Time = WAT(s) During sleep mode both charge and discharge FETs are turned off if the NR bit in Misc Config is cleared. If the bq2084-V123 is in Non-Removable mode where NR = 1, then the discharge FET retains its state on entry to sleep. Shutdown Mode The bq2084-V123 goes into shutdown, in which all FETs are turned off and the pack electronics are powered down (including the bq2084-V123), when SBS.Voltage() falls below Shutdown Voltage (DF 0x7c-0x7d) and the voltage at the Pack pin is less than the VPACK Threshold (DF 0x131, 0x132) both for 2 consecutive samples (1 to 2s). Vpack Threshold is programmed in units of 0.935 mV/count, and has tolerance of ±6%. For example, to set 12 V as Vpack Threshold, the program value should be 12000/0.935 = 12834. When the DSG FET is turned on, the pack voltage is very close to the battery voltage even with no charger attached. Therefore, to enter the shutdown. The Vpack threshold should be set higher than the shutdown threshold plus the tolerance. The bq2084-V123 can also be instructed to enter Shutdown mode via the ManufacturerAccess() command. When the command is sent to the bq2084-V123, the bq29312 is instructed to enter shutdown mode by the bq2084-V123. This forces the chipset into its lowest power mode. The bq2084-V123 does not issue a shutdown command to the AFE unless the pack voltage is less than the Vpack Threshold. Program the Vpack Threshold higher than the SBS.Voltage() when ship command is issued. Exit from this mode is only achieved by application of a charger. After exiting shutdown mode, the bq2084-V123 does not enter the shutdown mode again until the Shutdown Timer (DF 0x133, units are seconds) has expired even if the correct conditions are present. After the Shutdown Timer has expired, the SMBus command or voltage and current conditions enables the bq2084-V123 to enter shutdown mode. 25 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 Normal Operation SBS.VCELLx( ) Measured SBS.PackVoltage( ) Measured SBS.Voltage( ) calculated SBS.Voltage( ) 0, and the CVUV bit is cleared. REMAINING_CAPACITY_ALARM bit is set when the bq2084-V123 detects that RemainingCapacity() is less than that set by the RemainingCapacityAlarm() function. This bit is cleared when either the value set by the RemainingCapacityAlarm() function is lower than the RemainingCapacity() or when the RemainingCapacity() is increased by charging. REMAINING_TIME_ALARM bit is set when the bq2084-V123 detects that the estimated remaining time at the present discharge rate is less than that set by the RemainingTimeAlarm() function. This bit is cleared when either the value set by the RemainingTimeAlarm() function is lower than the AverageTimeToEmpty() or when the AverageTimeToEmpty() is increased by charging. STATUS BITS The initialized bit is set when the bq2084-V123 has detected a valid load of data flash at full or partial reset. It is cleared when the bq2084-V123 detects an improper data flash load. DISCHARGING bit is set when the bq2084-V123 determines that the battery is not being charged. This bit is cleared when the bq2084-V123 detects that the battery is being charged. FULLY_CHARGED bit is set when the bq2084-V123 detects a primary charge termination or an Overcharge condition. It is cleared when RelativeStateOfCharge() is less than the programmed Fully Charged Clear % in DF 0x4a. FULLY_DISCHARGED bit is set when Voltage() or VCELL is less than the EDV2 threshold and Current() < Overload Current or when RelativeStateOfCharge() < Battery Low %. This bit is cleared when RelativeStateOfCharge() is greater than or equal to 20%. ERROR CODES ERROR CODES DESCRIPTION OK The bq2084-V123 processed the function code without detecting any errors. Busy The bq2084-V123 is unable to process the function code at this time. Reserved The bq2084-V123 detected an attempt to read or write to a function code reserved by this version of the specification. The bq2084-V123 detected an attempt to access an unsupported optional manufacturer function code. Unsupported The bq2084-V123 does not support this function code which is defined in this version of the specification. AccessDenied The bq2084-V123 detected an attempt to write to a read-only function code. Over/Underflow The bq2084-V123 detected a data overflow or underflow. BadSize The bq2084-V123 detected an attempt to write to a function code with an incorrect data block. UnknownError The bq2084-V123 detected an unidentifiable error. CycleCount()(0x17) Description: Returns the number of cycles the battery has experienced. The mAh value of each count is determined by programming the Cycle Count Threshold value in DF 0x38-0x39. The bq2084-V123 saves the cycle count value to Cycle Count (DF 0x0c-0x0d) after an update to CycleCount(). Purpose: The CycleCount() function provides a means to determine the battery wear. It may be used to give advance warning that the battery is nearing its end of life. SMBus protocol: Read word 42 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 Output: Unsigned integer—count of total charge removed from the battery over its life. Units: cycle Range: 0 to 65,534 cycles; 65,535 indicates battery has experienced 65,535 or more cycles. Granularity: 1 cycle Accuracy: Absolute count DesignCapacity() (0x18) Description: Returns the theoretical or nominal capacity of a new pack. The DesignCapacity() value isexpressed in either current (mAh at a C/5 discharge rate) or power, (10 mWh at a P/5 discharge rate) depending on the setting of the BatteryMode() CAPACITY_MODE bit. Purpose: The DesignCapacity() function is used by the SMBus host's power management in conjunction with FullChargeCapacity() to determine battery wear. The power management system may present this information to the user and also adjust its power policy as a result. SMBus protocol: Read word Output: Unsigned integer—battery capacity in units of mAh or 10 mWh. BATTERY MODES CAPACITY_MODE BIT = 0 CAPACITY_MODE BIT = 1 Units mAh 10 mWh Range 0-65,535 mAh 0-65,535 10 mWh Granularity Not applicable Not applicable Accuracy Not applicable Not applicable DesignVoltage() (0x19) Description: Returns the theoretical voltage of a new pack (mV). The bq2084-V123 sets DesignVoltage() to the value programmed in Design Voltage (DF 0x04-0x05). Purpose: The DesignVoltage() function can be used to give additional information about a particular smart battery expected terminal voltage. SMBus protocol: Read word Output: Unsigned integer—the battery's designed terminal voltage in mV Units: mV Range: 0 to 65,535 mV Granularity: Not applicable Accuracy: Not applicable SpecificationInfo() (0x1a) Description: Returns the version number of the smart battery specification the battery pack supports, as well as voltage and current scaling information in a packed unsigned integer. Power scaling is the product of the voltage scaling times the current scaling. The SpecificationInfo() is packed in the following fashion: (SpecID_H × 0x10 + SpecID_L) + (VScale + IPScale × 0x10) × 0x100. The bq2084-V123 VScale (voltage scaling) and IPScale (current scaling) should always be set to zero. The bq2084-V123 sets SpecificationInfo() to the value programmed in Specification Information (DF 0x06-0x07). Purpose: The SpecificationInfo() function is used by the SMBus host's power management system to determine what information the smart battery can provide. SMBus protocol: Read word Output: Unsigned integer—packed specification number and scaling information: 43 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 FIELD BITS USED FORMAT ALLOWABLE VALUES SpecID_L 0...3 4-bit binary value 0–15 SpecID_H 4...7 4-bit binary value 0–15 VScale 8...11 4-bit binary value 0 (multiplies voltage by 10^ VScale) IPScale 12...15 4-bit binary value 0 (multiplies current by 10 ^ IPScale) ManufactureDate() (0x1b) Description: This function returns the date the cell pack was manufactured in a packed integer. The date is packed in the following fashion: (year-1980) * 512 + month * 32 + day. The bq2084-V123 sets ManufactureDate() to the value programmed in Manufacture Date (DF 0x08-0x09). Purpose: The ManufactureDate() function provides the system with information that can be used to uniquely identify a particular battery pack when used in conjunction with SerialNumber(). SMBus protocol: Read word Output: Unsigned integer-packed date of manufacture: FIELD BITS USED FORMAT Day 0...4 5-bit binary value 0-31 (corresponds to date) ALLOWABLE VALUES Month 5...8 4-bit binary value 1-12 (corresponds to month number) Year 9...15 7-bit binary value 0-127 (corresponds to year biased by 1980) SerialNumber() (0x1c) Description: This function is used to return a serial number. This number, when combined with the ManufacturerName(), the DeviceName(), and the ManufactureDate(), uniquely identifies the battery (unsigned integer). The bq2084-V123 sets SerialNumber() to the value programmed in Serial Number (DF 0x0a-0x0b). Purpose: The SerialNumber() function can be used to identify a particular battery. This may be important in systems that are powered by multiple batteries where the system can log information about each battery that it encounters. SMBus protocol: Read word Output: Unsigned integer ManufacturerName() (0x20) Description: This function returns a character array containing the battery manufacturer's name. For example, MyBattCo identifies the smart battery manufacturer as MyBattCo. The bq2084-V123 sets ManufacturerName() to the value programmed in Manufacturer Name (DF 0x0e-0x19). Purpose: The ManufacturerName() function returns the name of the smart battery manufacturer. The manufacturer's name can be displayed by the SMBus host's power management system display as both an identifier and as an advertisement for the manufacturer. The name is also useful as part of the information required to uniquely identify a battery. SMBus protocol: Read block Output: String—character string with maximum length of 11 characters (11 + length byte). DeviceName() (0x21) Description: This function returns a character string that contains the battery name. For example, a DeviceName() of bq2084-V123 indicates that the battery is a model bq2084-V123. The bq2084-V123 sets DeviceName() to the value programmed in Device Name (DF 0x1a-0x21). Purpose: The DeviceName() function returns the battery name for identification purposes. SMBus protocol: Read block Output: String—character string with maximum length of 7 characters (7 + length byte). 44 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 DeviceChemistry() (0x22) Description: This function returns a character string that contains the battery chemistry. For example, if the DeviceChemistry() function returns NiMH, the battery pack contains nickel metal hydride cells. The bq2084-V123 sets DeviceChemistry() to the value programmed in Device Chemistry (DF 0x22-0x26). Purpose: The DeviceChemistry() function gives cell chemistry information for use by charging systems. The bq2084-V123 does not use DeviceChemisty() values for internal charge control or fuel gauging. SMBus protocol: Read block Output: String—character string with maximum length of 4 characters (4 + length byte). The following is a partial list of chemistries and their expected abbreviations. These abbreviations are not case sensitive. CHEMISTRY ABBREVIATIONS Lead acid PbAc Lithium ion LION Nickel cadmium NiCd Nickel metal hydride NiMH Nickel zinc NiZn Rechargeable alkaline-manganese RAM Zinc air ZnAr The ManufacturerData() (0x23) Description: This function allows access to the manufacturer data contained in the battery (data). The bq2084-V123 stores seven critical operating parameters in this data area. Purpose: The ManufacturerData() function may be used to access the manufacturer's data area. The data fields of this command reflect the programming of eight critical data flash locations and can be used to facilitate evaluation of the bq2084-V123 under various programming sets. The ManufacturerData() function returns the following information in order: Pack Configuration, Gauge Configuration, Misc Configuration (2 bytes), Digital Filter, Self Discharge Rate, Pack Load Estimate, Battery Low%, and Near Full (2 bytes) AFE Status, and the pending EDV threshold voltage (low byte and high byte). SMBus protocol: Read block Output: Block data—data that reflects data flash programming as assigned by the manufacturer with maximum length of 13 characters (13 + length byte). Pack Status and Pack Configuration (0x2f) This function returns the pack status and pack configuration registers. The pack status register contains a number of status bits relating to bq2084-V123 operation. The pack status register is the least significant byte of the word. The pack configuration register reflects how the bq2084-V123 is configured as defined by the value programmed in Pack Configuration (DF 0x28). The pack status register consists of the following bits: b7 b6 b5 b4 b3 b2 b1 b0 PRES EDV2 SS VDQ AFEFAIL PF CVOV CVUV PRES The PRES bit indicates that the bq2084-V123 has been inserted into the system. 0 bq2084-V123 is out of the system 1 bq2084-V123 is inserted into a system 45 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 EDV2 The EDV2 bit indicates that pack or cell voltage (program option) is less than the EDV2 threshold. 0 Voltage > EDV2 threshold (discharging) 1 Voltage = EDV2 threshold SS The SS bit indicates the seal state of the bq2084-V123. 0 The bq2084-V123 is in the unsealed state 1 The bq2084-V123 is in the sealed state AFEFAIL The AFEFAIL bit indicates that AFE commuunications has failed. 0 AFE communications okay 1 AFE communications have failed VDQ The VDQ bit indicates if the present discharge cycle is valid for an FCC update. 0 Discharge cycle not valid 1 Discharge cycle valid PF The PF bit indicates that the bq2084-V123 PF Flag has been set. It is cleared only when the PF Flag has been cleared 0 bq2084-V123 PF Flag = 0x00 1 bq2084-V123 PF Flag = 0x66 CVOV The CVOV bit indicates that a protection limit has been exceeded including Prolonged Overcurrent, Overvoltage, or Overtemperature conditions. The bit is not latched and merely reflects the present fault status. 0 No secondary protection limits exceeded 1 A secondary protection limit exceeded CVUV The CVUV bit indicates that a protection limit has been exceeded including overload or overdischarge conditions. The bit is not latched and merely reflects the present fault status. 0 No secondary protection limits exceeded 1 A secondary protection limit exceeded VCELL4-VCELL1 (0x3c-0x3f) These functions return the calculated individual cell voltages in mV. DATA FLASH General The bq2084-V123 accesses the internal data flash during reset and when storing historical data. The data flash stores basic configuration information for use by the bq2084-V123. The data flash must be programmed correctly for proper bq2084-V123 operation. 46 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 Memory Map The following table shows the memory map for the data flash. It shows the default programming for the bq2084-V123. The default programming reflects example data for a 3s2p Li-Ion battery pack with a 0.02-Ω sense resistor. The data flash must be reprogrammed to meet the requirements of individual applications. DATA FLASH ADDRESS NAME LI-ION EXAMPLE 0x01 Remaining Time Alarm 0x03 Remaining Capacity Alarm 0x04 0x05 0x06 HIGH BYTE LOW BYTE 0x00 0x02 DATA MSB LSB 10 minutes 00 0a 360 mAh 01 68 Design Voltage 14400 mV 38 40 0x07 Specification Information v1.1/PEC 00 31 0x08 0x09 Manufacture Date 1/1/2003 = 11809 2e 21 0x0a 0x0b Serial Number 1 00 01 0x0c 0x0d Cycle Count 0 00 00 0x0e Manufacturer Name Length 11 0b 0x0f Character 1 T 54 0x10 Character 2 e 45 0x11 Character 3 x 58 0x12 Character 4 a 41 0x13 Character 5 s 53 0x14 Character 6 0x15 Character 7 I 49 0x16 Character 8 n 4e 0x17 Character 9 s 53 0x18 Character 10 t 54 0x19 Character 11 . 2e 0x1a Device Name Length 6 06 0x1b Character 1 b 42 0x1c Character 2 q 51 0x1d Character 3 2 32 0x1e Character 4 0 30 20 0x1f Character 5 8 38 0x20 Character 6 4 34 0x21 Character 7 — 00 0x22 Device Chemistry Length 4 04 0x23 Character 1 L 4c 0x24 Character 2 I 49 0x25 Character 3 O 4f 0x26 Character 4 N 4e 0x27 Manufacturer Data Length 9 09 0x28 Pack Configuration DMODE, 4-LEDs, 4-CELL c3 Gauge Configuration CSYNC, OTVC Misc Configuration OT, VOD 0x2c Digital Filter (Dead Band) 9860 nV 22 0x2d Self-Discharge Rate 0.2% 14 0x2e Electronics Load 0 mA 00 0x2f Battery Low % (MSB) 7.03% 12 0x29 0x2a 0x2b 41 0b 00 0x30 0x31 Near Full 200 mAh 00 c8 0x32 0x33 Design Capacity 7200 mAh 1c 20 0x34 0x35 Reserved 0 00 00 47 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 DATA FLASH ADDRESS NAME LI-ION EXAMPLE DATA HIGH BYTE LOW BYTE MSB LSB 0x36 0x37 Full Charge Capacity 7200 mAh 1c 20 0x38 0x39 Cycle Count Threshold 5200 mAh 14 50 0x3a 0x3b Charging Voltage 16800 mV 41 a0 c4 0x3c 0x3d Precharge Voltage 2500 mV 09 0x3e 0x3f Fast-Charging Current 2500 mA 09 c4 0x40 0x41 Maintenance Charging Current 0 mA 00 00 0x42 0x43 00 64 Precharge Current 100 mA 0x44 Precharge Temperature 9.6°C 60 0x45 Precharge Temperature Hysteresis 3.0°C 1e 0x46 Charge Inhibit Temp Low 0.0°C Charge Inhibit Temp High 50.0°C 0x49 Fast Charge Termination % 100% ff 0x4a Fully Charged Clear % 95% 5f 0x47 0x48 f4 0x4b 0x4c Current Taper Threshold 240 mA 00 f0 0x4d 0x4e Current Taper Qual Voltage 300 mV 01 2c Current Taper Window 40s 0x4f 0x50 0x51 28 Reserved 0x52 Maximum Overcharge 0x53 Reserved 0x54 Charge Efficiency 0x55 Reserved 0x56 0x57 0x58 48 00 01 40 300 mAh 01 2c 02 100% ff 64 Reserved 02 Reserved 22 32 0x59 0x5a Reserved 01 ae 0x5b 0x5c Overload Current 5000 mA 13 88 0x5d 0x5e Over Voltage Margin 700 mV 02 bc 0x5f 0x60 Reserved 01 f4 0x61 0x62 Clear Fail Current 256 mA 01 00 0x63 0x64 Cell Over Voltage 4350 mV 10 fe 0x65 0x66 Cell Under Voltage 2300 mV 08 fc 0x67 0x68 Terminate Voltage 11300 mV 2c 24 0x69 0x6a Reserved 00 00 0x6b 0x6c Safety Over Voltage 20000 mV 3a 98 0x6d 0x6e Charge Suspend Temp High 60°C 02 58 0x6f 0x70 Charge Suspend Temp High Reset 55°C 02 26 0x71 0x72 Over Temperature Discharge 70°C 02 bc 0x73 0x74 Over Temperature Discharge Reset 60°C 02 58 0x75 0x76 Safety OverTemperature Charge 75°C 02 ee 0x77 0x78 Safety OverTemperature Discharge 75°C 02 ee 0x79 Charge Suspend Temp Low 0°C 00 0x7a Reserved 0x7b Current Deadband 3 mA 03 Shutdown Voltage 8800 mV 22 60 VOC75 15848 mV 3d e8 0x7c 0x7d 0x7e 0x7f ef 0x80 Reserved bf 0x81 Reserved 56 0x82 Reserved 40 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 DATA FLASH ADDRESS HIGH BYTE LOW BYTE 0x83 0x84 NAME LI-ION EXAMPLE VOC50 15240 mV DATA MSB LSB 3b 88 0x85 Reserved 7f 0x86 Reserved 3d 0x87 0x88 Reserved 0x89 VOC25 27 15024 mV 3a b0 0x8a Reserved 3f 0x8b Reserved 24 0x8c Reserved 0e 0x8d Reserved 14 0x8e Voltage Average Time 1s 0x8f Correction Current Limit 64 mA 01 40 0x90 0x91 Reserved 0b e1 0x92 0x93 Reserved 0b 68 0x95 0x96 EMF/EDV0 3000 mV 0b b8 0x97 0x98 EDV C0 Factor/EDV1 3250 mV 0c b2 0x99 0x9a EDV R0 Factor/EDV2 3400 mV 0d 48 0x9b 0x9c EDV T0 Factor 0 00 00 0x9d 0x9e EDV R1 Factor 0 00 00 0x94 Reserved 19 0x9f EDV TC Factor 0 00 0xa0 EDV C1 Factor 0 00 0xa1 Reserved 08 0xa2 Reserved 9b 0xa3 Reserved c7 0xa4 Reserved 64 0xa5 Reserved 14 0xa6 0xa7 Reserved 02 00 0xa8 0xa9 Reserved 01 00 0xaa Reserved 0xab Reserved 0xac Learning Low Temp 0xad Reserved 08 02 11.9°C 77 0a 0xae 0xaf Reserved 01 80 0xb0 0xb1 Reserved 01 00 0xb2 Reserved 08 0xb3 Reserved 18 0xb4 Reserved 14 0xb5 0xb6 TS Const 1 91 83 0xb7 0xb8 TS Const 2 51 70 0xb9 0xba TS Const 3 e2 8f 0xbb 0xcc TS Const 4 0f ac 0xbd 0xce TS Const 5 00 00 0xbf 0xc0 Reserved 0f ac 0xc1 Reserved 02 0xc2 AFE State Control 00 0xc3 AFE Function Control 00 0xc4 AFE Cell Select 00 49 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 DATA FLASH ADDRESS NAME LI-ION EXAMPLE 0xc5 AFE Overload 140 mV 0xc6 AFE Overload Delay 31 ms 0xc7 AFE Short Circuit Charge HIGH BYTE LOW BYTE 0xc8 AFE Vref* 0xcb 0xcc Sense Resistor Gain* 0xcd 0xce CC Delta* (1) 0xcf 0xd0 CC Delta* (1) (1) 0xd3 CC Offset* LSB 12 0f 17 17 9750 mV 26 16 0.02 & 3b d0 0.0000323 mAh 92 0a 16 00 Reserved fa (1) 49701 c2 25 0xd4 DSC Offset* (1) 38 26 0xd5 ADC Offset* (1) 38 26 0 00 Temperature Offset* (1) 0xd6 0xd7 Board Offset* (1) 0 00 0xd8 0xd9 Reserved 00 40 0xda 0xdb Reserved 01 00 0xdc 0xdd Reserved 0xde 0xdf Version 05 1.0 Reserved 01 00 00 32 0xe0 0xe1 Cell Over Voltage Reset 4150 mV 10 36 0xe2 0xe3 Cell Under Voltage Reset 3000 mV 0b b8 0xe4 0xe5 AFE Fail Limit 2 counts 00 02 0xe6 0xe7 Reserved ff ff 0xe8 0xe9 Cell Balance Thresh 3900 mV 0f 3c 0xea 0xeb Cell Balance Window 100 mV 00 64 Cell Balance Min 40 mV Cell Balance Interval 20 s 0xec 0xed 50 (1) 0xca 0xd1 (1) MSB AFE Short Circuit Discharge 0xc9 0xd2 DATA 28 14 0xee 0xef Cell Imbalance Threshold 01 f4 0xf0 0xf1 Balance Vcell Max 10 36 0xf2 0xf3 Balance Imax 00 9e 0xf4 0xf5 Reserved a5 5a 0xf6 0xf7 Reserved 7a 43 0xf8 0xf9 Reserved 20 83 0xfa Battery Low (LSB) 7.03 % 12 0xfb AFE Check Time 0s 00 0xfc Sleep Current Thresh 2 mA 04 0xfd Sleep Current Multiplier 5 counts 05 0xfe Sleep Time 20 s 14 0xff 0x100 Manufacturer Info 1 00 00 0x101 0x102 Manufacturer Info 2 00 00 0x103 0x104 Manufacturer Info 3 00 00 0x105 0x106 Vmax Charge Voltage 4280 mv 10 b8 0x107 0x108 Voff Charge Voltage 4280 mv 10 b8 0x109 0x10a Von Charge Voltage 4200 mv 10 68 0x10b 0x10c Pulse Max On Time 60 s 01 e0 0x10d 0x10e Pulse Min Off Time 0.125 s 00 01 Reserved locations must be set as shown. Locations marked with an * are typical calibration values that can be adjusted for maximum accuracy. For these locations the table shows the appropriate default or initial setting. bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 DATA FLASH ADDRESS NAME LI-ION EXAMPLE DATA HIGH BYTE LOW BYTE MSB LSB 0x10f 0x110 Max Charge Time 7200 s 1c 20 0x111 0x112 Precharge Detection Current 10 mA 00 0a 0x113 0x114 Charge Detection Current 100 mA 00 64 0x115 0x116 Discharge Detection Current -150 mA ff 6a 0x117 0x118 Reserved 10 68 0x119 0x11a Reserved 10 36 0x11b 0x11c Reserved 00 0x11d Permanent Fail Status 0 00 0x11e Permanent Fail Flag 0 00 0x11f Permanent Fail Config 0 00 0x120 Permanent Fail Input Time 0 00 0x121 0x122 Reserved 17 12 0x123 0x124 Reserved 26 73 0x125 0x126 FET Fail Charge Current 20 mA 00 20 0x127 0x128 FET Fail Discharge Current -20 mA ff FET Fail Time 20 s Charge OC Threshold 4000 mA Charge OC Time 6s Discharge OC Threshold 10970 mA 0x12f Discharge OC Time 10 s 0x130 Fault Reset Time 30 s 0x129 0x12a 0x12b 0x12c 0x12d 0x131 0x12e 0x132 VPACK Threshold 0x133 0x134 0x135 ec 14 0f a0 06 2a da 00 1e 07 d0 Shutdown Timer 20 s 14 Cell Imbalance Time 20 s 14 0x136 Reserved ADDITIONAL PROGRAMMING INFORMATION ADDITIONAL DATA FLASH PROGRAMMING The following sections describe the function of each data flash location and how the data is to be stored. Fundamental Parameters Sense Resistor Value The 32-bit CC Delta (DF 0xcd-0xd0) corrects the coulomb counter for sense resistor variations. It represents the gain factor for the coulomb counter. The 16-bit Sense Resistor Gain (DF 0xcb-0xcc) scales each integrating converter conversion to mAh. The Current() related measurement Sense Resistor Gain is based on the resistance of the series sense resistor. The following formula computes a nominal or starting value for Sense Resistor Gain from the sense resistor value (in Ω). Sense Resistor Gain = 306.25 ÷ Rs RSNS Value (mΩ) Sense Resistor Gain 5 61250 10 30625 20 15312 51 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 CC offset CC offset (DF 0xd2-0xd3), contains the offset for the coulomb counter. It is automatically updated when the pack has met the conditions for sleep, before it enters sleep mode. DSC offset DSC offset (DF 0xd4), contains the offset for the pack ground reference. It is automatically updated when the pack has met the conditions for sleep, before it enters sleep mode. ADC offset ADC offset (DF 0xd5), contains the offset for the a/d converter. It is automatically updated when the pack has met the conditions for sleep, before it enters sleep mode. Digital Filter The desired digital filter threshold, VDF (V), is set by the value stored in Digital Filter (DF 0x2c). Digital Filter = VDF ÷ 290 nV CELL AND PACK CHARACTERISTICS Battery Pack Capacity and Voltage Pack capacity in mAh units is stored in Design Capacity (DF 0x32-0x33). In mAh mode, the bq2084-V123 copies Design Capacity to DesignCapacity(). In mWh mode, the bq2084-V123 multiplies Design Capacity by Design Voltage (DF 0x04-0x05) to calculate DesignCapacity() scaled to 10 mWh. Design Voltage is stored in mV. The initial value for Full Charge Capacity, in mAh, is stored in DF 0x36-0x37. Full Charge Capacity is modified over the course of pack usage to reflect cell aging under the particular use conditions. The bq2084-V123 updates Full Charge Capacity in mAh after a capacity learning cycle. Remaining Time Alarm and Capacity Alarm Remaining Time Alarm (DF 0x02-0x03) set the alarm thresholds used in the SMBus command codes 0x01 and 0x02, respectively. Remaining Time Alarm is stored in minutes and Remaining Capacity Alarm in units of mAh or 10 mWh, depending on the BatteryMode() setting. Cycle Count Initialization Cycle Count (DF 0x0c-0x0d) stores the initial value for the CycleCount() function. It should be programmed to 0x0000. Cycle Count Threshold Cycle Count Threshold (DF 0x37-0x38) sets the number of mAh that must be removed from the battery to increment . Cycle Count threshold is a 16-bit value stored in mAh. Charge Efficiency The bq2084-V123 applies the efficiency factor, EFF%, to all charge added to the battery. EFF% is encoded in Charge Efficiency (DF 0x54) according to equation 16: Charge Efficiency = (EFF% × 2.56-1) PACK OPTIONS Pack Configuration Pack Configuration (DF 0x28) contains bit-programmable features. 52 b7 b6 b5 b4 b3 b2 b1 b0 DMODE LED1 LED0 HPE CPE SM CC1 CC0 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 DMODE The DMODE bit determines whether the LED outputs indicate AbsoluteStateOfCharge() or RelativeStateOfCharge(). 0 LEDs reflect AbsoluteStateOfCharge() 1 LEDs reflect RelativeStateOfCharge() LED1–LED0 The LED bits set the number of LEDs for RemainingCapacity() indication. 0-0 Configures the bq2084-V123 for five LEDs 0-1 Configures the bq2084-V123 for three LEDs 1-0 Configures the bq2084-V123 for four LEDs 1-1 Configures the bq2084-V123 for five LEDs HPE The HPE bit enables/disables PEC transmissions to the smart battery host for master mode alarm messages. 0 No PEC byte on alarm warning to host 1 PEC byte on alarm warning to host CPE The CPE bit enables/disables PEC transmissions to the smart battery charger for master mode messages. 0 No PEC byte on broadcasts to charger 1 PEC byte on broadcasts to charger SM The SM bit enables/disables master mode broadcasts by the bq2084-V123. 0 Broadcasts to host and charger enabled 1 Broadcasts to host and charger disabled If the SM bit is set, modifications to bits in BatteryMode() do not re-enable broadcasts. CC1–CC0 The CC bits configure the bq2084-V123 for the number of series cells in the battery pack. 1-1 Configures the bq2084-V123 for four series cells 1-0 Configures the bq2084-V123 for three series cells 0-1 Configures the bq2084-V123 for two series cells Gauge Configuration Gauge Configuration (DF 0x29) contains bit-programmable features: b7 b6 b5 b4 b3 b2 b1 b0 0 CSYNC SC CEDV EDVV OVSEL VCOR OTVC CSYNC In usual operation of the bq2084-V123, the CSYNC bit is set so that the coulomb counter is adjusted when a fast charge termination is detected. In some applications, especially those where an externally controlled charger is used, it may be desirable not to adjust the coulomb counter. In these cases the CSYNC bit should be cleared. 0 The bq2084-V123 does not alter RM at the time of a valid charge termination. 1 The bq2084-V123 updates RM with a programmed percentage of FCC at a valid charger termination. 53 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 SC The SC bit enables learning cycle optimization for a Smart Charger or independent charge. 1 Learning cycle optimized for independent charger 0 Learning cycle optimized for Smart Charger CEDV The CEDV bit determines whether the bq2084-V123 implements automatic EDV compensation to calculate the EDV0, EDV1, and EDV2 thresholds base on rate, temperature, and capacity. If the bit is cleared, the bq2084-V123 uses the fixed values programmed in data flash for EDV0, EDV1, and EDV2. If the bit is set, the bq2084-V123 calculates EDV0, EDV1, and EDV2. 0 EDV compensation disabled 1 EDV compensation enabled EDVV The EDVV bit selects whether EDV termination is to be done with regard to Voltage() or the lowest single-cell voltage. 0 EDV conditions determined on the basis of the lowest single-cell voltage 1 EDV conditions determined on the basis of Voltage() OVSEL The OVSEL bit determines if Safety Over Voltage is based on Voltage() or highest cell voltages. 0 Safety overvoltage based on Voltage() 1 Safety overvoltage based on highest cell voltage multiplied by the number of cells and then compared to the safety voltage. VCOR The VCOR bit enables the midrange voltage correction algorithm. When it is set, the bq2084-V123 compares the pack voltage to RM and may adjust RM according to the values programmed in VOC25, VOC50, and VOC75. 0 Continuous midrange corrections disabled 1 Continuous midrange corrections enabled OTVC The OTVC bit programs the bq2084-V123 to perform a midrange voltage one time after a device reset 0 One-time midrange correction disabled 1 One-time midrange correction enabled Miscellaneous Configuration Misc Configuration in DF 0x2a (high) and 0x2b (low) contains additional bit programmable features. Misc Configuration (high) DF 0x2a b15 b14 b13 b12 b11 b10 b9 b8 IT 0 AFEDET DS OT ECLED 1 VOD IT The IT bit configures the bq2084-V123 to use its internal temperature sensor. The DF constants 0xb5-0xc0 need to match the required thermistor on internal temperature sensor. See the Data Flash Settings for Internal or External Temperature Sensor Table. 0 54 bq2084-V123 requires an external thermistor. bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 1 bq2084-V123 uses its internal temperature sensor. AFEDET The AFEDET bit programs the bq2084-V123 to look for errors with I2C communications and the AFE and enables the detection of the AFE permanent failure if bit 3 of PF Config 0x11f is set. 0 Does not verify AFE communications. 1 Does verify AFE communications. DS The DS bit programs the bq2084-V123 to enter sleep mode on SMBus inactivity. 0 bq2084-V123 enters sleep mode when the SMBus is low for 2 s. 1 bq2084-V123 does not enter sleep mode. OT The OT bit programs the bq2084-V123 to turn off the discharge FET when the bq2084-V123 detects an overtemperature condition. Charge FET is always turned off in overtemperature conditions. 0 bq2084-V123 does not turn off the discharge FET on overtemperature. 1 bq2084-V123 turns off the discharge FET on overtemperature. ECLED The ECLED bit programs the LED activity during charging (DSG bit = 0). 0 The LEDs are not enabled during charging. 1 The LEDs are enabled during charging. VOD The VOD bit enables a 1-s time delay in the setting of the CVOV and CVUV bits in PackStatus. 0 No delay 1 1-s delay Misc Configuration (low) DF 0x2b b7 b6 b5 b4 b3 b2 b1 b0 LEDRCA PFET1 PFET0 NR CHGFET 0 0 0 LEDRCA The LEDRCA bit programs the LED to blink when there is a RemainingCapacityAlarm. 0 The LEDs blink when there is a RemainingCapacityAlarm. 1 The LEDs are off there is a RemainingCapacityAlarm. PFET1, PFET0 The PFETx bits define the precharge FET operation. See the bq29312 data sheet for more detail. 0,0 The bq29312 ZVCHG FET is turned on for precharge. Assumes charger has precharge function. 0,1 The charge FET is turned on for precharge. Assumes charger has precharge function. 1,0 The bq29312 OD FET is turned on for precharge. Assumes charger does not have precharge function. 1,1 Not defined, unpredictable operation NR 55 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 The NR bit defines whether the bq2084-V123 is to be used with a nonremovable system battery. If set to indicate a nonremovable system battery there are additional clear conditions for a battery failure due to overcharge, overcurrent, and overload. The additional conditions besides battery removal (defined as the loss system present pin going high) are either detection of an opposite current of that that caused the failure or when AverageCurrent() is less than Clear Fail Current DF 0x61, 0x62 for a time defined by Fault Reset Time DF 0x130. Also, for a nonremovable battery the charge FET is left on for discharge current failures and the discharge FET is left on for charge current failures. 0 Removable battery, battery fail conditions cleared by battery removal only. 1 Nonremovable system battery. CHGFET The CHGFET bit programs the charge FET to remain on even after a charge terminate condition. 0 The charge FET is turned off after a charge termination condition. 1 The charge FET is turned on after a charge termination condition. Constants and String Data Specification Information Specification Information (DF 0x06-0x07) stores the default value for the SpecificationInfo() function. It is stored in data flash in the same format as the data returned by the SpecificationInfo(). Manufacture Date Manufacture Date (DF 0x08-0x09) stores the default value for the ManufactureDate() function. It is stored in data flash in the same format as the data returned by the ManufactureDate(). Serial Number Serial Number (DF 0x0a-0x0b) stores the default value for the SerialNumber() function. It is stored in data flash in the same format as the data returned by the SerialNumber(). Manufacturer Name Data Manufacturer Name Length (DF 0x0e) stores the length of the desired string that is returned by the ManufacturerName() function. Locations DF 0x0f-0x19 store the characters for ManufacturerName() in ASCII code. Device Name Data Device Name Length (DF 0x1a) stores the length of the desired string that is returned by the DeviceName() function. Locations DF 0x1b-0x21 store the characters for DeviceName() in ASCII code. Device Chemistry Data Device Chemistry Length (DF 0x22) stores the length of the desired string that is returned by the DeviceChemistry() function. Locations DF 0x23-0x26 store the characters for DeviceChemistry() in ASCII code. Manufactuters Data Length Manufacturers Data Length (DF 0x27) stores the length of the desired number of bytes that is returned by the ManufacturersData() function. It should be set to 9. Temperature Limits The limits described below are extensions to those limits detailed in the safety and charging sections of this data sheet. 56 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 Charge Suspend Temp Low Charge Suspend Temp Low (DF 0x79) sets the lowest temperature, in degrees C/10, at which normal operation is allowed. If the temperature falls below this limit, the pack goes into a temporary failure state, the charge FET is turned off, and the MAC status is set to system present. It is cleared when the pack warms, or the pack is removed. Charge Inhibit Temp Low Over Temperature Discharge Reset (DF 0x73-0x74) sets the temperature, in degrees C/10, at which the pack will recover from Over Temperature Discharge Over temperature will also reset when the pack is removed from the system if not in the non-removable mode. Charge Inhibit Temp High Charge Inhibit Temp Low (DF 0x46) inhibits charging by setting ChargingCurrent() and ChargingVoltage() to 0 and turn off the CHG FET. It is programmed in degrees C/10 and the range of -12.8°C to 12.7°C. Charge Suspend Temp High Charge Inhibit Temp High (DF 0x47-0x48) inhibits charging by setting ChargingCurrent() and ChargingVoltage() to 0 Charge Suspend Temp High Reset Charge Suspend Temp High (DF 0x6d-0x6e) sets the highest temperature, in degrees C/10, at which charging will be allowed to continue. If this temperature is exceeded during charging, the pack goes into a temporary failure state, and the MAC status is set to system present. It is cleared when the pack cools below OverTemperature Charge Reset, or ac adapter is removed, or the pack is removed. Charging can only resume when the temperature returns to within the charge start temperature limits. Over Temperature Discharge Charge Suspend Temp High Reset (DF 0x6f-0x70) sets the temperature, in degrees C/10, at which the pack recovers from Charge Suspend Temp High fault. Over Temperature Discharge Reset Over Temperature Discharge (DF 0x71-0x72) sets the highest temperature, in degrees C/10, at which discharging will be allowed. If the pack exceeds this temperature, charge and discharge FETs are turned off, and MAC status is set to system present. The pack returns to normal operation when the temperature falls below Over Temperature Discharge Reset, or if the pack is removed. Failure Detection Thresholds Safety OverTemperature Charge Safety OverTemperature Charge (DF 0x75-0x76) sets the temperature, in degrees C/10, above which, during charging, the pack enters permanent failure, if the XSOTC bit in Permanent Failure Configuration is set. Safety OverTemperature Discharge Safety OverTemperature Discharge (DF 0x77-0x78) sets the temperature, in degrees C/10, above which, during discharging, the pack enters permanent failure, if the XSOTD bit in Permanent Failure Configuration is set. Charge Detection Current Charge Detection Current (DF 0x113-0x114) sets the threshold in milliamperes for detecting charge current. This is a signed value and is positive. This threshold is used for detecting cross-conduction, and ensuring that charge termination is not improperly detected due to loss of charging current. 57 bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 Discharge Detection Current Discharge Detection Current (DF 0x115-0x116) sets the threshold in milliamperes for detecting discharge current. This is a signed value and is negative. This threshold is used for detecting cross-conduction and determining that the charge FET should be turned on during discharge to reduce IR losses. FET Fail Charge Current FET Fail Charge Current (DF 0x125-0x126) sets the threshold in milliamperes for detecting current in a charge FET which is turned off. This is a signed value and is positive. FET Fail Discharge Current FET Fail Discharge Current (DF 0x127-0x128) sets the threshold in milliamperes for detecting current in a discharge FET which is turned off. This is a signed value and is negative. FET Fail Time FET Fail Time (DF 0x129) sets the time in seconds that current must be detected in a FET which is turned off, in order to determine that the FET has failed. Terminate Voltage Terminate Voltage (DF 0x67-0x68), sets the threshold below which the Terminate Discharge Alarm is set. The alarm is cleared when the voltage rises above this threshold, if the CVUV bit in Pack Status is not set. Offsets and Limits Temperature offset Temperature offset (DF 0xd6), contains a signed offset for the pack's temperature measurements, in degrees C/10. It is set at board test during pack calibration. Board offset Board offset (DF 0xd7), contains a signed offset for the pack's coulomb counter measurements. If used, it is set at board design time. Current Deadband Current Deadband (DF 0x7b), sets the threshold in mA below which a current measurement will not be detected. Shutdown Voltage Shutdown Voltage (DF 0x7c-0x7d) sets the pack voltage below which the pack's electronics, including the bq2084-V123, is shut down to conserve power. All FETs are turned off by the AFE. APPLICATION INFORMATION Figure 7 shows a typical bq2084-V123-based battery pack application. The circuit consists of the bq29312 analog front end (AFE) IC, bq29400 second level protection IC, LED, temperature measurement network, data flash connections, serial port and the sense resistor. The data flash stores basic battery pack configuration information and measurement calibration values. The data flash must be programmed properly for bq2084-V123 operation. 58 BATIN X4 X5 1 2 3 4 BAT1P X3 1 1 R5 R2 100 R8 100 1 k 0.1 µ F R7 R9 100 C7 C6 1k R6 C5 0.1 µ F C4 0.1 µ F R10 100 0.1 µ F 1 2 3 4 R11 100 8 7 6 5 D1 JP1 3 2N7002 3 Q1 1 R43 2 1 Q3 BAT54LT1 D3 100 k R12 100 k R45 VCC R14 5k R13 5k R17 R18 1M 5k 2 F1 6A 321 0.47 µ F D4 BAT54LT1 4 300 1W R22 100 k 4 C21 0.47µ F R44 100 k R42 VCC 8 7 65 R16 100 R15 100 2 0.1 µ F C16 0.1µ F C19 0.1 µ F C18 0.1 µ F 1 1 21 20 2 R21 61.9 k VCC DSG ZVCHG CHG 1 BAT PACK 22 RT1 19 SLEEP C17 4.7µ F REG 18 10 k 3 TOUT 17 VC1 24 R19 1 OD 4 VC2 U2 8.45 k SCLK 13 5 VC3 bq29312 SDATA 14 6 VC4 XALERT 16 7 VC5 WDI 10 R20 100 23 PMS CELL 11 SR1 SR2 GND GND 8 9 15 12 C20 2 100 k C12 0.1 µ F 2N7002 3 Q2 1 BAV99 D2 BAV99 BSS84 U1 bq29400 VC1 OUT VC2 VDD VC3 CD GND VC4 C1 C2 C8 C9 C10 C11 0.1 µ F 0.1 µ F 0.1 µ F 0.1µ F 0.1 µ F 1 µ F 50 V .020 75 PPM BAT2P X2 R1 BAT4P BAT3P X1 1k R4 100 1k R3 0.1 µ F C3 8 7 65 Q5 Si4435DY 321 C14 0.1µ F Q4 Si4435DY 1M R23 C22 R24 4 Q6 Si4435DY 1M R27 10 R28 3 SW1 0.1 µ F 100 4 2 3 1 100 k R35 VCC D6 4 D7 R37 R39 100 100 1 GREEN 2 1 PACK− C29 150 pF C30 2200 pF GREEN 2 1 D9 SMBD SMBC Sys Pres X8 X7 X10 R46 R47 X9 1M 1M 100 D11 AZ23C5V6 R41 R40 AZ23C5V6 D10 61.9 k D8 R36 100 100 R38 GREEN 2 1 GREEN 2 1 470 470 470 470 470 100 k 1 GREEN 2 D5 VCC R30 R31 R32 R33 R34 C28 68 PF C27 0.47µ F R25 8 31 VDDD VDDA 30 11 VSSD VSSA 19 VSSD VSSA 29 38 VSSD OC 3 18 PFIN VSSA/XCK1 34 12 33 ROSC/XCK2 SAFE 15 37 NC SMBC 2 TS 16 U3 SMBD 6 SCLK bq2084 32 10 SDATA FLT 36 NC NC 7 25 EVENT LED5 20 35 CLKOUT LED4 21 1 LED3 22 VIN 5 k 4 PU LED2 23 5 PRES LED1 24 28 SR1 NC 14 27 SR2 MRST RBI NC DISP 26 9 13 17 R29 C26 C25 68 PF VCC C24 0.47µ F 0.047 µ F 8 765 C13 321 0.1µ F bq2084-V123 www.ti.com SLUS619B – AUGUST 2004 – REVISED JUNE 2005 APPLICATION INFORMATION (continued) Figure 7. bq2084-V123 Based Battery Pack Schematic 59 PACKAGE OPTION ADDENDUM www.ti.com 3-Jul-2009 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty BQ2084DBT-V123 NRND TSSOP DBT 38 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR BQ2084DBT-V123G4 NRND TSSOP DBT 38 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR BQ2084DBTR-V123 NRND TSSOP DBT 38 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR BQ2084DBTR-V123G4 NRND TSSOP DBT 38 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Lead/Ball Finish MSL Peak Temp (3) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. 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