Your location: Standard SMBus Commands


SMBus protocol used in BMS design

[Revised date]May 2014

System Management Bus (SMBus) is a two-wire interface through which various system component chips can communicate with each other and with the rest of the system. It is based on the principles of operation of I2C. SMBus provides a control bus for system and power management related tasks. A system may use SMBus to pass messages to and from devices instead of tripping individual control lines. Removing the individual control lines reduces pin count. Accepting messages ensures future expandability. With System Management Bus, a device can provide manufacturer information, tell the system what its model/part number is, save its state for a suspend event, report different types of errors, accept control parameters, and return its status. Generally, battery-pack is a "slave" mode and load device or battery charger act as a "master" mode. Here is the standard commands which used in battery management application.

Table: Standard SMBUS COMMANDS 
SBS Cmd  Mode  Name  Format  Size in Bytes  Min Value  Max Value  Unit 
0x00  R/W  ManufacturerAccess  hex  2 0x0000  0xffff   
0x01  R/W  RemainingCapacityAlarm  unsigned int  2 0 65535 mAh
0x02  R/W  RemainingTimeAlarm  unsigned int  2 0 65535 min 
0x03  R/W  BatteryMode  hex  2 0x0000  0xe383   
0x04  R/W  AtRate  signed int  2 -32768 32767 mAh
0x05  AtRateTimeToFull  unsigned int  2 0 65534 min 
0x06  AtRateTimeToEmpty  unsigned int  2 0 65534 min 
0x07  AtRateOK  unsigned int  2 0 65535  
0x08  Temperature  unsigned int  2 0 65535 0.1K
0x09  Voltage  unsigned int  2 0 65535 mV 
0x0a  Current  signed int  2 -32768 32767 mA 
0x0b  AverageCurrent  signed int  2 -32768 32767 mA 
0x0c  MaxError  unsigned int  1 0 100
0x0d  RelativeStateOfCharge  unsigned int  1 0 100
0x0e  AbsoluteStateOfCharge  unsigned int  1 0 100+ 
0x0f  R/W  RemainingCapacity  unsigned int  2 0 65535 mAh
0x10  FullChargeCapacity  unsigned int  2 0 65535 mAh
0x11  RunTimeToEmpty  unsigned int  2 0 65534 min 
0x12  AverageTimeToEmpty  unsigned int  2 0 65534 min 
0x13  AverageTimeToFull  unsigned int  2 0 65534 min 
0x14  ChargingCurrent  unsigned int  2 0 65534 mA 
0x15  ChargingVoltage  unsigned int  2 0 65534 mV 
0x16  BatteryStatus  unsigned int  2 0x0000  0xdbff   
0x17  R/W  CycleCount  unsigned int  2 0 65535  
0x18  R/W  DesignCapacity  unsigned int  2 0 65535 mAh
0x19  R/W  DesignVoltage  unsigned int  2 0 65535 mV 
0x1a  R/W  SpecificationInfo  hex  2 0x0000  0xffff   
0x1b  R/W  ManufactureDate  unsigned int  2     ASCII 
0x1c  R/W  SerialNumber  hex  2 0x0000  0xffff   
0x20  R/W  ManufacturerName  String  11+1      ASCII 
0x21  R/W  DeviceName  String  7+1      ASCII 
0x22  R/W  DeviceChemistry  String  4+1      ASCII 
0x23  R/W  ManufacturerData  String  14+1      ASCII 
0x2f  R/W  Authenticate  String  20+1      ASCII 
0x3c  CellVoltage4  unsigned int  2 0 65535 mV 
0x3d  CellVoltage3  unsigned int  2 0 65535 mV 
0x3e  CellVoltage2  unsigned int  2 0 65535 mV 
0x3f  CellVoltage1  unsigned int  2 0 65535 mV 





                

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