SLUSE05 December   2019 BQ78350-R1A

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Electrical Characteristics: Supply Current
    6. 7.6  Electrical Characteristics: I/O
    7. 7.7  Electrical Characteristics: ADC
    8. 7.8  Electrical Characteristics: Power-On Reset
    9. 7.9  Electrical Characteristics: Oscillator
    10. 7.10 Electrical Characteristics: Data Flash Memory
    11. 7.11 Electrical Characteristics: Register Backup
    12. 7.12 SMBus Timing Specifications
    13. 7.13 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Primary (1st Level) Safety Features
      2. 8.3.2 Secondary (2nd Level) Safety Features
      3. 8.3.3 Charge Control Features
      4. 8.3.4 Fuel Gauging
      5. 8.3.5 Lifetime Data Logging
      6. 8.3.6 Authentication
      7. 8.3.7 Battery Parameter Measurements
        1. 8.3.7.1 Current and Coulomb Counting
        2. 8.3.7.2 Voltage
        3. 8.3.7.3 Temperature
    4. 8.4 Device Functional Modes
    5. 8.5 Programming
      1. 8.5.1 Physical Interface
      2. 8.5.2 SMBus Address
      3. 8.5.3 SMBus On and Off State
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Schematic
      2. 9.2.2 Design Requirements
      3. 9.2.3 Detailed Design Procedure
        1. 9.2.3.1 Measurement System
          1. 9.2.3.1.1 Cell Voltages
          2. 9.2.3.1.2 External Average Cell Voltage
          3. 9.2.3.1.3 Current
          4. 9.2.3.1.4 Temperature
        2. 9.2.3.2 Gas Gauging
        3. 9.2.3.3 Charging
          1. 9.2.3.3.1 Fast Charging Voltage
          2. 9.2.3.3.2 Fast Charging Current
          3. 9.2.3.3.3 Other Charging Modes
        4. 9.2.3.4 Protection
        5. 9.2.3.5 Peripheral Features
          1. 9.2.3.5.1 LED Display
          2. 9.2.3.5.2 SMBus Address
      4. 9.2.4 Application Performance Plots
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Power Supply Decoupling Capacitor
      2. 11.1.2 MRST Connection
      3. 11.1.3 Communication Line Protection Components
      4. 11.1.4 ESD Spark Gap
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Related Documentation
    2. 12.2 Support Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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7.12 SMBus Timing Specifications

VCC = 2.4 V to 2.6 V, TA = –40°C to 85°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN NOM MAX UNIT
fSMB SMBus operating frequency SLAVE mode, SMBC 50% duty cycle 10 100 kHz
fMAS SMBus master clock frequency MASTER mode, no clock low slave extend 51.2 kHz
tBUF Bus free time between start and stop 4.7 µs
tHD:STA Hold time after (repeated) start 4 µs
tSU:STA Repeated start setup time 4.7 µs
tSU:STO Stop setup time 4 µs
tHD:DAT Data hold time RECEIVE mode 0 ns
TRANSMIT mode 300
tSU:DAT Data setup time 250
tTIMEOUT Error signal/detect See note(1) 25 35 ms
tLOW Clock low period 4.7 µs
tHIGH Clock high period See note(2) 4 50
tLOW:SEXT Cumulative clock low slave extend time See note(3) 25 ms
tLOW:MEXT Cumulative clock low master extend time See note(4) 10
tF Clock/data fall time (VILMAX – 0.15 V) to (VIHMIN + 0.15 V) 300 ns
tR Clock/data rise time 0.9 VCC to (VILMAX – 0.15 V) 1000
(1) The BQ78350-R1A device times out when any clock low exceeds tTIMEOUT.
(2) tHIGH:MAX is minimum bus idle time. SMBC = 1 for t > 50 μs causes a reset of any transaction in progress involving the BQ78350-R1A device.
(3) tLOW:SEXT is the cumulative time a slave device is allowed to extend the clock cycles in one message from initial start to stop.
(4) tLOW:MEXT is the cumulative time a master device is allowed to extend the clock cycles in one message from initial start to stop.
BQ78350-R1A SBSTiming.gifFigure 1. SMBus Timing Diagram