ON Semiconductor® SSG Division Battery Fuel Gauge IC (LC709203F) Battery Fuel Gauge IC for 1-Cell Lithium-ion (Li+) Application Note Ver2.00 Battery Fuel Gauge IC (LC709203F) Application Note 1. 2. 3. 4. Introduction Features Pin Assignment Performance Specifications 4.1 Application Field 4.2 Electrical Characteristics 4.3 Communication Protocol 4.4 Note on Electrical Characteristics 4.5 About matters that require attention in the board making 4.6 Example of Standard Use of the Application 4.7 About Alarm Function 5. Schematic 6. Evaluation Board 7. Board Layout 8. Bill of materials 9. Performance Data 9.1 Discharge1: Current Charge (250mA 1500mA) 9.2 Discharge2: Current Charge (1100mA 500mA) 9.3 Discharge3: Pulse Discharge (1250mA 1750mA) 9.4 Discharge4: Neglect (750mA, 20min Neglect, 750mA) 9.5 Discharge5: Standby Current (8mA) 9.6 Discharge6: Constant Watt (3.76W) 1. Introduction The LC709203F is an IC that measures the remaining power level of 1-cell lithium-ion (Li+) batteries used for portable equipment etc. This product reduces fuel gauge errors with a unique correction technology during measurement of battery temperature and voltage. This technology has inherently high precision without the need for an external sense 2. Features Delivering the industry’s leading accuracy of ±3% for the battery fuel gauge detection allows high accuracy estimation of the remaining operating time. Quiescentis a very low 15µA. Since a high-cost external resistor for current detection is not required, both BOM cost and substrate size are reduced. 3. Pin Assignment SCL SDA TSENSE TSW VDFN8 (4.03.0) Top view 8 7 6 5 WLP9 (1.761.60) Bottom view VDFN8 WLP9 VSS VDD 3 SCL NC ALARMB 2 1 3 4 SDA TEST VSS VDD 2 TSW ALARMB 1 TEST LC709203F TSENSE C B A Pin Name I/O Description Test pin 1 1B TEST I *Connect to VSS. 2 1A VSS - Connect to the - terminal of the battery. 3 3A VDD - Connect to the + terminal of the battery. 4 2A ALARMB O Alert indication. An active low output used to indicate specified condition thresholds have been met. *When you do not use an alert function, please connect with V SS. Battery temperature reading control pin 5 3B TSW O *Set high when reading in the temperature, held low at other times. I Battery temperature analog voltage input pin 6 3C TSENSE 7 1C SDA I/O I2C data pin 8 2C SCL I/O I2C clock pin - 2B NC - Not used pin. *Recommend to connect to VSS. 4. Performance Specifications 4.1. Application Field This product is ideal for mobile devices such as smart-phones, mobile phones, digital still cameras, digital video cameras, MP3 players, and portable DVD players that are powered by 1-cell lithium-ion batteries or include a battery pack, and require a display to indicate the battery's remaining power levels. 4.2. Electrical Characteristics Specification Parameter Consumption current Voltage measurement accuracy Conditions VDD[V] Unit Min Typ Max Normal Mode 2.5 to 4.5 15 26 Accurate ECO Mode 2.5 to 4.5 2 4.5 Sleep Mode 2.5 to 4.5 0.2 4 Ta = +25C 3.6 -7.5 +7.5 2.5 to 4.5 -20 +20 Ta = -20C to +70C μA mV/cell 4.3. Communication Protocol Communication protocol type ： I2C Frequency : to 400kHz IC address : 0x16 ( It becomes "0001011X" w hen you w rite a binary, because the slave address is 7 bits. [ X]=Rd/Wr. ) Bus Protocols S ： Start Condition Sr ： Repeated Start Condition Rd ： Read (bit value of 1) Wr ： Write (bit value of 0) A ： ACK (bit value of 0) N ： NACK (bit value of 1) P ： Stop Condition CRC-8 ： Slave Address to Last Data (CRC-8-ATM : ex.3778mV : 0x16,0x09,0x17,0xC2,0x0E → 0x86) ： Master-to-Slave ： Slave-to-Master … ： Continuation of protocol Read Word Protocol S Slave Address Wr A Command Code A Sr Slave Address Rd A Data Byte Low A … Data Byte High … A CRC-8 N P *When you do not read CRC -8, there is not the reliability of data. CRC-8-ATM ex : (5 bytes) 0x16,0x09,0x17,0xC2,0x0E " 0x86 Write Word Protocol S Slave Address Data Byte Low Wr A … A Command Code A Data Byte High A CRC-8 A P *When you do not add CRC -8, the Written data (Data byte Low /High) become invalid. CRC-8-ATM ex : (4 bytes) 0x16, 0x09, 0x55, 0xAA → 0x3B Com m and Code Slave Functions Stats Range 0x06 Thermistor B R/W 0x07 Initial RSOC W R 0x0000 to 0xFFFF (Thermistor Mode) W 0x09E4 to 0x0D04 (Via I2C) R 0x08 Cell Temperature 0x09 Cell Voltage Unit Initial Value 0x0000 to 0xFFFF B 0x0D34 0xAA55 Value - 0.1°K (0.0℃ = 0x0AAC) 0x0BA6 (25℃) 0x0000 to 0xFFFF mV 0x0000 Current Direction R/W 0x0000 or 0x0001 or 0xFFFF 0x0001 : Charge Mode 0x0000 : Auto Mode 0xFFFF : Discharge Mode 0x0B Adjustment Pack Appli R/W 0x0000 to 0xFFFF Value - 0x0C Adjustment Pack Thermistor R/W 0x0000 to 0xFFFF Value 0x001E 0x0000 to 0x0064 % - 0x0A RSOC R Set RSOC W 0x0F Indicator To Empty R 0x0000 to 0x03E8 Value 0x11 IC Version R 0x0000 to 0xFFFF Version - 0x12 Change Of The Parameter R/W 0x0000 or 0x0001 Please refer to a low er list 0x0000 0x13 Alarm Low RSOC R/W 0x0000 to 0x0064 % (activate under) 0x0008 0x14 Alarm Low Cell Voltage R/W 0x0000 to 0xFFFF mV (activate under) 0x0000 0x0000 to 0x0002 0x0000 : Nomal Mode 0x0001 : Accurate ECO 0x0002 : Sleep Mode - bit 1 to 15 : Reserved (fix 0) 0 : disable 1 : enable 0x0000 0x0301 or 0x0504 Please refer to a low er list - 0x0D 0x15 IC Pow er Mode R/W 0x16 Status Bit R/W 0x1A Number Of The Parameter R Type Of The Battery LC709203F-01 LC709203F-04 Normal Voltage3.8V, Charge Voltage 4.35V Normal Voltage3.7V, Charge Voltage 4.2V ICR18650-26H (SAMSUNG) UR18650ZY (Panasonic) bit 0 : Thermistor Mode Number Of The Parameter 0x0301 0x0504 Change Of The Parameter 0x0000 0x0001 0x0000 0x0001 RSOC = Relative State Of Charge 0xXXXX = Hexadecimal notation (Note) Initialization from Host : - The IC w ill initialize reading the battery temperature until Initialization sequence w ith serial port is executed. (Please see EVB manual for sequences.) Control from Host : - The Remaining State of Charge (RSOC) is normally read periodically. - To read temperature the part w ill need a sequence of instructions and then returned to RSOC reading. 4.4. Note on Electrical Characteristics 1. Since I2C address is fixed ensure that other devices do not use the same address. 2. IC’s initialization time is within 80ms from power on. 3. If initialized (Initial Relative State of Charge) the IC by I2C, start reading battery value after 2ms. 4. If power is applied to VDD and VSS the battery value will remain stable regardless of the state of the Enable/Disable registers. 4.5. Layout and schematic 1. Connect the capacitor (1μF) between VDD and VSS as near the terminal of the IC as possible. 2. When you do not use an alarm function simply connect the alarm terminal to VSS without a pullup resistor. Example of Standard Use of the Application Samples of the Battery Fuel Gauge IC (LC709203F) can measure the battery value with high accuracy. However, if there is no calibration there may be an error of ±5 to 10% when flowing large-current (about 0.5C) depending on the state of charge of the battery. Please contact ON Semiconductor prior to part qualification for a review of the intended design and to determine if a calibrated part is needed. 4.6. About Alarm Function If the Battery’s remaining charge drops lower than the set value or lower than the set voltage The output at AlarmB will be pulled low by the open drain internal FET. ○ Please examine the chart below concerning this function. (initial setting is 8%) Change the setting to 3% 5. Schematic Figure1. When temperature detection function is not utilized: Figure2. When the temperature detection function is in use: 6. Evaluation Board Pack + 55mm Thermistor Pack - 91mm Figure3. LC709203F(WLCSP9) Evaluation Board (Note) Please refer to a LC709203F Evaluation kit Manual for the evaluation board operation. 7. Board Layout Figure5. IC Side Layout Figure6. Bottom Layout Figure7. Board Size 8. Bill of materials Designator Quantity Description Description1 Value Value1 Tolerance Dip Footprint Manufacturer Part Number Substitution Allowed Lead Free ST-2-2 MAC8 ST2-2 Yes Yes ALRT, SCL, SDA, TMP2, VDD, VSS, VSS1 BAT+, BAT-,TMP1 7 Terminal 3 Terminal ST-2-2 MAC8 NM Yes Yes C1 0 Capacitor SMD *u 16V 10% 1005 Murata GRM155B31CXXXKA12# Yes Yes C2 1 Capacitor SMD 1u 16V 10% 1005 Murata GRM155B31C105KA12# Yes Yes C3, C4 2 Capacitor SMD 5p 50V ±0.25pF 1005 Murata GRM1535C1H5R0CDD5# Yes Yes C5 1 Capacitor SMD 2.2u 10V ±10% or ±15% 1005 Murata or TDK GRM155B31A225KE95# or C1005X5R1A225K050BC Yes Yes C6, C8, C10, C12 4 Capacitor SMD 0.1u 25V ±10% 1005 Murata GRM155B31E104KA87# Yes Yes C7 1 Capacitor SMD 2.2u 10V ±10% 1005 Murata GRM155B31A225KE95# Yes Yes C9, C11 2 Capacitor SMD 1500p 50V ±10% 1005 Murata GRM15XB11H152KA86# Yes Yes CF1 1 Murata ceralock SMD 12MHz X-CSTCE Murata CSTCE12M0GH5L Yes Yes CN1 1 Molex 54819-0519 Molex_54819-0519 Molex 54819-0519 CN2 0 LANDφ0.8mm D1 1 Switching Diode SMD SOD-323 ON Semiconductor MMDL6050T1G No Yes IC1 1 WLP9 SMD WLP9 ON Semiconductor LC709203F No Yes IC2 1 SMD SQFP48(7X7) ON Semiconductor No Yes LED1, LED2, LED3, LED4 4 LED SMD LED1608 unknown RED Yes Yes R1, R2, R4 3 Resistor SMD 100 0.063W ±5% 1005 KOA RK73B1ETTD101J Yes Yes R3 1 Resistor SMD 100k 0.063W ±5% 1005 KOA RK73B1ETTD104J Yes Yes R5, R7 2 Resistor SMD 33 0.063W ±5% 1005 KOA RK73B1ETTP330J Yes Yes R6 1 Resistor SMD 10k 0.063W ±1% 1005 KOA RK73B1ETTP103F Yes Yes R16, R17 2 Resistor SMD 10k 0.063W ±5% 1005 KOA RK73B1ETTP103J Yes Yes R8 1 Resistor SMD 1.5k 0.063W ±5% 1005 KOA RK73B1ETTP152J Yes Yes R9 1 Resistor SMD 100 0.063W ±5% 1005 KOA RK73B1ETTP101J Yes Yes R10 1 Resistor SMD 100k 0.063W ±5% 1005 KOA RK73B1ETTP104J Yes Yes R11 1 Resistor SMD 15k 0.063W ±5% 1005 KOA RK73B1ETTP153J Yes Yes R12, R13, R14, R15 4 Resistor SMD 3k 0.063W ±5% 1005 KOA RK73B1ETTP302J Yes Yes RD1 1 Resistor SMD 330 0.063W ±5% 1005 KOA RK73B1ETTP331J Yes Yes ZD1 1 Zener Diode SMD SOD-323 ON Semiconductor MM3Z5V6T1G No Yes ZD2 1 SMD SMD SOD-523 ON Semiconductor MM5Z6V2ST1G No Yes Dip LAND3pin 9. Performance Data 9.1. Discharge1: Current Charge (250mA 1500mA) *After discharging the battery (with 250mA load) from 100% down to 25%, the load is increased to 1500mA. Battery remaining is still linear after discharge current is changed. 9.2. Discharge2: Current Charge (1100mA 500mA) *After discharging the battery (with 1100mA load) from 100% down to 30%, the load is decreased to 500mA. Battery remaining is still linear after discharge current is changed. Discharge3: Pulse Discharge (1250mA 1750mA) *Pulse discharging by alternating discharge current values of 1250mA and 1750mA every 10sec. battery remaining is linear for 100% to 0%. 9.3. Discharge4: Neglect (750mA, 20min Neglect, 750mA) *Discharging battery from 100% to 50% with 750mA load. After removing load for 20min, discharge the battery with 750mA again. Battery remaining is still linear. When load is removed the graph shows the battery’s voltage increases and at the point of re-discharge, battery voltage decreases. Discharge5: Standby Current (8mA) *Assuming the part is in stand-by and the load is 8mA. Even at the very little current flowing, the graph is still linear. 9.4. Discharge6: Constant Watt (3.76W) *Increasing current as the battery’s voltage decreases to discharge at the same power (3.76W). In this case, battery remaining is still linear. *Testing discharging of 100% to 0%. Discharging current is 500mA. Temperature is room temp., 0 degree Celsius and 50 degree Celsius. Red line shows the ideal line and maximum error is the 2.8%. *Discharging test of 100% to 0% at room temperature. Shows discharging values of 500mA, 750mA, 1000mA, 1250mA and 1500mA. Red line is the ideal line and maximum error is 2.4%. ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. 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