CellWise-CW2015芯片手册 datasheet.pdf-资料库

Gas Gauge IC Series CW2015-DS V2.1 Mob：13510032582 QQ：316224953 Mail：fred@gold-luck.com CW2015 Low-Cost Fuel Gauge IC with Low-SOC Alert Features   3% Maximum Total SOC Measurement Error  14-bit Delta Sigma ADC for Temperature and Cell System-Side or Pack-Side Fuel Gauging Voltage Measurement  Precision Voltage Measurement  No Offset Accumulation During Life Time  No Full-to-Empty Battery Learning Cycles Necessary  No Sense Resistor Required   External SOC and RRT available Alarm/Interrupt for Low-Battery Warning Available  Patented “FastCali” gas gauging algorithm  Calibration After Quick Soft-Reset  Very Low Active and Sleep Power Consumption - - Normal mode 15uA Sleep mode <1uA Tiny, Lead(Pb)-Free, TDFN and CSP Package  General I2C interface  Applications  Smartphone Tablet PCs Order Information   Handheld and Portable Applications is an ultra-compact, General Description The CW2015 low-cost, host-side/pack-side, sensing resistor free, fuel gauging system IC for Lithium-ion(Li+) based batteries in handheld and portable devices. CW2015 tracks Li+ battery’s operational condition and uses state-of-art algorithm to report the relative State-of-Charge (SOC) of very different battery chemistry systems (LiCoOx, polymer Li-ion, LiMnOx etc.). CW2015 includes a 14-bit Sigma-Delta ADC, a precision voltage reference and build-in accurate temperature sensor. The IC allows the end-user to eliminate the expensive sensing resistor which occupies large board area. And the IC also sends out the alarm signal if the battery SOC level reaches pre-programmed threshold. Quick start function offers the possibility to make an initial estimation of the battery’s SOC, which also enables the IC to be located on system side or pack side, giving the flexibility to system maker on pack selection. CW2015 uses a 2-wire I2C compatible serial interface that operates in standard (100 kHz), fast (400 kHz). Name Operation Temperature CW2015CSAD CW2015CSAC -20℃ to 70℃ -20℃ to 70℃ Package TDFN8 CSP9 Package Mark 2015CSAD 2015CSAC Cellwise copyright reserved 1 www.cellwise-semi.com

Gas Gauge IC Series CW2015-DS V2.1 Type number CW2015 X X X X Package type Parameter generation Embedded Battery profile type S: CellWise Li-Polymer profile* Function and revision *This is only means the embedded profile for test is Li-polymer, not means the CW2015 is only used for Li-polymer battery. The D: TDFN8; C: CSP9 A: Standard firmware and parameter, A version C: C generation product CW2015 is compatible with Li-ion, Li-polymer and other type Li batteries Function Block Diagram Fig1. Block diagram Absolute Maximum Ratings Voltage on Supply VDD Pin Relative to GND ········································ Voltage on All Other Pins Relative to GND ········································ Operating Temperature Range ········································ ········································ Junction Temperature Store Temperature Range ········································ Caution: Stresses beyond "Absolute Maximum Ratings" condition may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. -0.3 to +6V -0.3 to +6V -20℃ to 70℃ 150℃ -55℃ to 125℃ Cellwise copyright reserved 2 www.cellwise-semi.com SDASCLQSTRTALRTCTGCELLVDDGNDMCU(ALU)Voltage ADCStart-up RegulatorOSCBandgap PORTemp. Sensor

Gas Gauge IC Series CW2015-DS V2.1 Electrical Characteristics Recommended DC Operating Conditions (2.5≤VDD≤4.5, TA= -20 to 70OC, unless otherwise specified.) PARAMETER SYMBOL CONDITIONS Supply Voltage Data I/O Pins Analog I/O VDD SCL, SDA QSTRT, ________ ALRT CELL, CTG Min. +2.5 -0.3 -0.3 Typ. Max. UNITS +4.5 +5.5 +5.5 V V V Table1. Electrical Operating Parameters DC Electrical Characteristics (2.5≤VDD≤4.5, TA= -20 to 70OC, unless otherwise specified.) PARAMETER SYMBOL CONDITIONS Min. Typ. Max. UNITS Active Current Sleep-Mode Current Time-Based Accuracy ADC input resistor ADC resolution ADC conversion time Battery Voltage update time Input Logic-High SCL, SDA, QSTRT Input Logic-Low SCL, SDA, QSTRT Input Hysteresis ________ Output Logic-Low: SDA, ALRT ________ Pull down current: SDA, ALRT IACTIVE ISLEEP tERR RADIN tADCON tVUPDATE VIH VIL VIHYS VOL Normal Operation VDD≤2.0V VDD=3.7V VDD=Vcell=3.7V VDD=Vcell=3.7V VDD=Vcell=3.7V VDD=3.7V VDD=3.7V IOL=4mA -3 10 1.4 0.2 15 0.5 14 10 250 0.2 4 20 1.0 +3 0.6 0.4 μA μA % MΩ bits ms ms V V V V mA Table2. DC Electrical Characteristics Cellwise copyright reserved 3 www.cellwise-semi.com

Gas Gauge IC Series CW2015-DS V2.1 Pin Arrangement and Description TDFN Package Top view 2mm*3mm – 8pin CSP Package Top view 1.48mm*1.41mm – 9pin Fig2. Pin arrangement TDFN Pin No. CSP Pin No. Pin Name Description 1 2 3 4 5 6 7 8 9 9 6 3 8 2 7 4 1 CTG CELL VDD GND ________ ALRT Connect to ground Battery voltage monitor I/O System power supply General purpose ground connection Low SOC alarm signal for MCU interrupt controller QSTRT Quick start, allows to do a quick SOC estimate SCL SDA EP Serial clock input Serial data Input/output Exposed pad, connect to GND or let floating Table3. Pin description Function CW2015 is an ultra-compact, high precise gas gauging IC that embed new generational battery SOC estimate algorithm. CW2015 provide the battery voltage, SOC and RRT estimate to user by measuring the cell voltage and temperature. FastCali algorithm From battery OCV (open circuits voltage), we deduce the SOC (state of charge) of this battery. Obtains OCV from two ways: idle battery voltage that has been relaxed at least half an hour; battery voltage adds the internal resistor voltage drop when charging or discharging. track” technology Creative “equipment current precisely calculates the present voltage drop of the internal resistor, combine with the FastCali algorithm, CW2015 promptly infer the OCV value no matter the battery in charging, relaxing, or different current varying state. First SOC Estimate after Power Up CW2015 considers the battery as a free one that has been relaxed more than 0.5 hour when power up. CW2015 treats the battery voltage measured by the 14bits ADC as an OCV voltage. According to this voltage, CW2015 deduces the first SOC value. Error in the first SOC value will be calibrated during the normal use. Cellwise copyright reserved 4 www.cellwise-semi.com 12348765CW20159147258369

Gas Gauge IC Series CW2015-DS V2.1 RRT RRT offers the system remaining run time to user for reference. RRT is determined by the present SOC and battery discharging current, i.e. total system power dissipation. Battery remaining capacitor divide the current is the run time. Base on the “equipment current track” technology, CW2015 obtains the discharging current only through measure the battery voltage. RRT updates all the time and vary according to the present current. Minimum scale of the RRT is 1min. Quick Start Quick start allows CW2015 to restart fuel gauge calculations in the same manner as an initial power-up by pull up the quick start pin or set the MODE register [0x0A]. This action used to reduce the large error in the SOC value. Low SOC Alert When battery SOC lower than or equal to the setting threshold [0x06~0x07], low SOC alert triggered. CW2015 set the ALRT flag to 1, and pull down the ALRT pin to inform the external host. The ALRT pin remains logic-low until the host reset the ALRT flag to Register Map Below table shows the I2C register map for the CW2015. logic 0 by I2C bus. Cleared ALRT don’t generate another alert signal while the SOC remains below the alert threshold. The SOC must rise above and then fall below or equal to the alert threshold value before another interrupt is generated. Sleep Mode All the function will be halt in the sleep mode, power dissipation of CW2015 reduced to the lowest level. Set the MODE register bit Sleep to 11 to enter into the sleep mode. All the data update stop, when recover from sleep mode, SOC algorithm begins from the stop point. When the battery voltage lower than 2.5V, CW2015 enter into the sleep mode automatically. POR Power on reset. Set the MODE register bit POR to 1111 to reset the device, all the registers and date except flash will reset to zero. Register Name Address Description Read/Write* Default Value VERSION 0x00 Returns IC version, software version VCELL SOC 0x02-0x03 Report 14-bit A/D measurement of battery voltage 0x04-0x05 Report 16-bit SOC result calculated RRT_ALRT 0x06-0x07 13 bits remaining run time and low SOC alert bit CONFIG MODE 0x08 0x0A Configure register, alert threshold set Special command for IC state R R R W/R W/R W/R *Read/Write means they can be read from application processor outside our IC Table4. Register map 0x6F 0x00 0x00 0x00 0x18 0xC0 Cellwise copyright reserved 5 www.cellwise-semi.com

Gas Gauge IC Series CW2015-DS V2.1 VCELL Register The VCELL register is a read-only register that updates continuously the battery terminal voltage. Battery voltage is measured at the CELL pin with GND pin as a ground reference. A 14bit sigma-delta A/D converter is used and the voltage resolution is 305uV for CW2015. This A/D converter updates the cell voltage for a period of <10ms after IC POR and then four times a second afterwards. Fig 3.VCELL Register Format SOC Register The SOC register is also a read-only register that indicates the State-of-Charge of the battery cell. SOC value is a relative concept which display as a percentage of the cell’s total capacity. This register intrinsically adjusts itself to the change of battery cell’s parameter due to aging, poor cell parameter distribution control or rapid change in total capacity. In this register, the high 8bit part contains the SOC information in % units which can be directly used by end user if this accuracy is already good enough for application. The low 8bit part provides more accurate part of the SOC information until 1/256%. Fig 4.SOC Register Format RRT_ALRT Register ALRT, Flag register bit. This bit is set by the IC when the SOC register value falls below or equal to the alert threshold setting and an interrupt is generated. This bit can only be cleared by the host through I2C bus . The power-up default value for ALRT is logic 0. The read-only register RRT indictors the remaining run time of the battery according to the present the SOC and discharging current. RRT is not a linear variation value, and update per 1s. Register RRT provide 13bits to record the remaining time, 1 LSB represents 1 minute. Fig 5.RRT_ALRT Register Format Cellwise copyright reserved 6 www.cellwise-semi.com 0021321221121029282726252423222120MSB – Address 0x02LSB – Address 0x03MSBLSBMSBLSB2-12-22-32-42-52-62-72-8MSB – Address 0x04LSB – Address 0x05MSBLSBMSBLSB2726252423222120ALRT0021221121029282726252423222120MSB – Address 0x06LSB – Address 0x07MSBLSBMSBLSB

Gas Gauge IC Series CW2015-DS V2.1 CONFIG Register ATHD is low SOC alert threshold setting register. The alert threshold is a 5-bit value that sets the state of charge level where an interrupt is generated on the ALRT pin. The alert threshold has an LSB weight of 1% and can be programmed from 0% up to 31%. The power-up default value for ATHD is 3%. UFG is a flag bit used to indicator the battery information update state. Fig 6.CONFIG Register Format MODE Register Mode register is used for Master to control the IC. Sleep mode, two bits to control. Default value 11, write 11 to force the CW2015 enter the sleep mode; write 00 to wake up. QSTRT, quick start, two bits to control. Default value 00, write 11 to start. Quick-start allows the IC to restart fuel-gauge calculations in the same manner as initial power-up of the IC. For example, if an application’s power-up sequence is exceedingly noisy such that excess error is introduced into the IC’s “first guess” of SOC, the host can issue a quick-start to reduce the error. A quick-start is also initiated by a rising edge on the QSTRT pin. POR, power of reset, four bits to control. Default value 0000, write 1111 to completely restart the IC as if power removed. Fig7. MODE Register Format I2C Interface The CW2015 communicates through an I2C interface. I2C is a two-wire open-drain interface supporting multiple devices and masters on a single bus. Some I2C devices can act as masters or slaves, but the CW2015 can only act as a slave device that only pull the bus wires LOW and never drive the bus HIGH. Data on the I2C-bus can be transferred at rates of up to 100kbit/s in standard mode or fast (400 kHz) or fast mode plus (1 MHz) modes. Device Address I2C device address is consist of 7bits slave address and 1 read/write control bit. ADD6 Fig8. I2C address structure ADD3 ADD0 ADD5 ADD4 ADD2 ADD1 R/W Address of CW2015 is fixed on 0b1100010. Combine with de R/W bit: Cellwise copyright reserved 7 www.cellwise-semi.com ATHD24ATHD23ATHD22ATHD21ATHD200UFG0MSB – Address 0x08MSBLSBSleep21Sleep20QSTRT21POR23POR22POR21POR20MSB – Address 0x0AMSBLSBQSTRT20

Gas Gauge IC Series CW2015-DS V2.1 Read command of CW2015 is 0xC5; Write command of CW2015 is 0xC4. START and STOP Conditions When the bus is idle, both SCL and SDA must be HIGH. A bus master signals the beginning of a transmission with a START condition by transitioning SDA from HIGH to LOW while SCL is HIGH. When the master has finished com- municating with the slave, it issues a STOP condition by transitioning SDA from LOW to HIGH while SCL is HIGH. The bus is then free for another transmission. When the bus is in use, it stays busy if a repeated START (Sr) is generated instead of a STOP condition. The repeated START (Sr) conditions are functionally identical to the START (S). Read and Write Command Figure 11 shows an overview of the read and write command on the I2C bus. Read S 0xC4 A Register Address (8bits) A Sr 0xC5 A Register data (8bits) A P S 0xC4 A Register Address (8bits) A Write data (8bits) A P Write Fig9. Read and write command Cellwise copyright reserved 8 www.cellwise-semi.com From Master to SlaveSStartFrom Slave MasterAAcknowlage

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CellWise-CW2015芯片手册 datasheet.pdf

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