Datasheet LT8491 (Analog Devices) - 7

link to page 4 LT8491
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VDD = AVDD = 3.3V, SHDN = 3V unless otherwise noted. (Note 3) PARAMETER CONDITIONS MIN TYP MAX UNITS EEPROM Characteristics
Endurance (Note 8) 0°C < TJ < 85°C During EEPROM Write Operations 100,000 Cycles
Digital Input/Output SCL, SDA
SDA Input Voltage High (VSDA_VIH) l 2.25 V SDA Input Voltage Low (VSDA_VIL) l 0.65 V SCL Input Voltage High (VSCL_VIH) l 2.25 V SCL Input Voltage Low (VSCL_VIL) l 0.65 V SDA Input Leakage Current (ILEAK_SDA) SDA = 0V and 3.3V l <0.05 ±1 µA SCL Input Leakage Current (ILEAK_SCL) SCL = 0V and 3.3V l <0.05 ±1 µA SDA Output Low Voltage (VSDA_OL) 3mA into SDA Pin l 0.4 V
I2C Timing Characteristics
Serial Clock Frequency (fSCL) l 100 kHz Serial Clock Low Period (tLOW) l 4.7 µs Serial Clock High Period (tHIGH) l 4 µs Bus Free Time Between Stop and Start (tBUF) l 4.7 µs Start Condition Hold Time (tHD,STA) l 4 µs Start Condition Setup Time (tSU,STA) l 4.7 µs Stop Condition Setup Time (tSU,STO) l 4 µs Data Hold Time (tHD,DAT) (Note 9) l 0 ns Data Setup Time (tSU,DAT) l 250 ns
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings M3 or parallel Schottky diodes when present. The SW1 and SW2 pins may cause permanent damage to the device. Exposure to any Absolute are tolerant of these negative voltages more than one diode drop below Maximum Rating condition for extended periods may affect device ground, guaranteed by design. reliability and lifetime.
Note 6:
These thresholds are measured by the internal A/D converter. The
Note 2:
Do not force voltage on the VC pin. A/D reference voltage is AVDD. AVDD, VDD and an additional 2.8mA load are
Note 3:
The LT8491E is guaranteed to meet performance specifications regulated by LDO33 to create the AVDD reference for these measurements. from 0°C to 125°C junction temperature. Specifications over the –40°C The absolute threshold voltages will shift with corresponding changes in to 125°C operating junction temperature range are assured by design, the AVDD voltage. characterization and correlation with statistical process controls. The
Note 7:
10V minimum VIN required for solar powered start-up if low power LT8491I is guaranteed over the full –40°C to 125°C junction temperature mode is enabled. range.
Note 8:
The EEPROM has an endurance of at least 100,000 write/erase
Note 4:
Do not apply a voltage or current source to these pins. They must cycles. Data retention of 20 years at 85°C, 100 years at 25°C. These be connected to capacitive loads only; otherwise permanent damage may statements are based on published information from vendor. occur.
Note 9:
A master device must provide a hold time of at least 300ns for the
Note 5:
Negative voltages on the SW1 and SW2 pins are limited in the SDA signal (referred to the minimum VIH of the SCL signal) to bridge the applications by the body diodes of the external NMOS devices M2 and undefined region of the SCL falling edge. Rev. 0 For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Overview I2C Serial Interface I2C: START and STOP Conditions I2C: ACKnowledge I2C: Chip Addressing I2C: Clock Stretching I2C: Data Transfer Transactions I2C: Powering the Interface I2C Data Data: Memory Regions Data: Bytes, Words and Long Words Data: Min/Max Register Values Data: Access Permissions Startup Sequence Battery Charging Algorithm Stage 0: Trickle Charging Stage 1: Full Constant Current Stage 2: Constant Voltage Stage 3: (Optional) Reduced Constant Voltage Done Charging Charging Faults Maximum Power Point Tracking Telemetry Operation Telemetry: Configuration Settings Telemetry: Acquisition CRC Operation EEPROM Operation EEPROM: Startup EEPROM: Reading EEPROM: Writing I2C Register Map I2C Register Descriptions Telemetry Registers TELE_TBAT TELE_POUT TELE_PIN TELE_EFF TELE_IOUT TELE_IIN TELE_VBAT TELE_VIN TELE_VINR Status Registers STAT_CHARGER STAT_SYSTEM STAT_SUPPLY STAT_TSx_REMAIN STAT_CHRG_FAULTS STAT_VERSION STAT_BOOT_CRC STAT_CFG_CRC Control The EEPROM CTRL_WRT_TO_BOOT CTRL_EE_WRT_EN Control Other Functions CTRL_HALT_STARTUP CTRL_CHRG_EN CTRL_RESTART_CHIP CTRL_RESET_FLAG CTRL_UPDATE_TELEM Configure The Telemetry CFG_RSENSE1 CFG_RIMON_OUT CFG_RSENSE2 CFG_RDACO CFG_RFBOUT1 CFG_RFBOUT2 CFG_RDACI CFG_RFBIN2 CFG_RFBIN1 Configure Initial Charger Enable CFG_INIT_CHRG_EN Configure VBAT for Stages 0, 1 and 3 CFG_VS3_25C CFG_UV_S0 CFG_S0_UV CFG_S0_S1 CFG_S1_S0 Configure Temperature Fault Limits CFG_TBAT_MIN CFG_TBAT_MAX Configure Stage Timeout Limits CFG_TMR_S0 CFG_TMR_S1 CFG_TMR_S2 CFG_TMR_S3 Configure Automatic Restart CFG_RSTRT_IN_FLT CFG_RSTRT_IN_DONEA CFG_RSTRT_IN_DONEB CFG_RSTRT_IN_S3 Configure Charge Termination CFG_TERMINATE Configure Misc. CFG_SCAN_RATE_LP CFG_SCAN_RATE CFG_CHRG_MISC Configure Temperature Compensation CFG_TC3, CFG_TC2, CFG_TC1 Configure User Code CFG_USER_CODE Manufacturer Data MFR_DATA1 MFR_DATA2 MFR_DATA3 Applications Information Hardware Configuration HW Config: Input Voltage Sensing and Modulation HW Config: VINR Pin Connections HW Config: Solar Panel Powered Charging HW Config: DC Supply Powered Charging HW Config: VBAT in Stage 2 (VS2) HW Config: Input Current Sense and Limit HW Config: Output Current Sense and Limit HW Config: Current Sense Filtering HW Config: Battery Temperature and Disconnect Sensing HW Config: SHDN Pin Connections HW Config: MODE Pin – Current Conduction Mode HW Config: Driving an LED with the STATUS Pin HW Config: I2C Chip Address Pin In-Situ Battery Charging Hot-Plugging Considerations STATUS Indicator Pin Lithium-Ion Battery Charging Lead-Acid Battery Charging Optional Features Optional: Low Power Mode Optional: Output Feedback Resistor Disconnect Optional: EXTVCC Disconnect Optional: Remote Battery Voltage Sensing Optional: DC Supply Detection Circuit Board Layout Considerations Design Example Typical Applications Package Description Typical Application Related Parts