Advanced Configuration and Power Interface Specification

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Advanced Configuration and Power Interface Specification An ACPI-compatible Smart Battery subsystem consists of: • An SMB-HC (CPU to SMB-HC) interface • At least one Smart Battery • A Smart Battery Charger • Either a Smart Battery System Manager or a Smart Battery Selector if more than one Smart Battery is supported In such a subsystem, a standard way of communicating with a Smart Battery and Smart Battery Charger is through the SMBus physical protocols. The Smart Battery System Manager or Smart Battery Selector provides event notification (battery insertion/removal, and so on) and charger SMBus routing capability for any Smart Battery subsystem. A typical Smart Battery subsystem is illustrated below: 562 April, 2015 Version 6.0
Power Source and Power Meter Devices SMBus SBS Battery0 0xB Host Interface SMBus Host Controller (0x8) SMBus SBS System Manager 0xA SMBus SMBus SMBus SBS Battery1 0xB SBS Battery2 0xB SBS Charger 0x9 Figure 10-59 Typical Smart Battery Subsystem (SBS) SMBus defines a fixed 7-bit slave address per device. This means that all batteries in the system have the same address (defined to be 0xB). The slave addresses associated with Smart Battery subsystem components are shown in the following table. Table 10-270 Example SMBus Device Slave Addresses SMBus SBS Battery3 0xB SMBus Device Description SMBus Host Slave Interface Smart Battery Charger/Charger Selector or Charger System Manager Smart Battery System Manager or Smart Battery Selector Smart Battery SMBus Slave Address (A0-A6) 0x8 0x9 0xA 0xB Each SMBus device has up to 256 registers that are addressed through the SMBus protocol’s Command value. SMBus devices are addressed by providing the slave address with the desired register’s Command value. Each SMBus register can have non-linear registers; that is, command register 1 can have a 32-byte string, while command register 2 can have a byte, and command register 3 can have a word. The SMBus host slave interface provides a standard mechanism for the host CPU to generate SMBus protocol commands that are required to communicate with SMBus devices (in other words, the Smart Battery components). ACPI defines such an SMB-HC that resides in embedded controller address space; however, an OS can support any SMB-HC that has a native SMB-HC device driver. • Event notification for battery insertion and removal • Event notification for AC power connected or disconnected • Status of which Smart Battery is communicating with the SMB-HC • Status of which Smart Battery(s) are powering the system • Status of which Smart Battery(s) are connected to the charger • Status of which Smart Batteries are present in the system Version 6.0 563
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Advanced Configuration and Power In
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Contents 1 2 Introduction........
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5 ACPI Software Programming Model
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7 6.3.6 _RMV (Remove) ............
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9.2.5 _ALR (Ambient Light Response)
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A.4.1 Power State Definitions......
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Tables Table 1-1 Hardware Type vs.
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Table 5-91 Power state Values .....
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Table 6-184 Device Insertion, Remov
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Table 10-275 Control Method Battery
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Appendix A Device Class Specificati
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• PCI Bus Power Management Capabi
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A.4.1 Power State Definitions State
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centenary value, RTC alarm 83 Centr
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features 68 functional implementati
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logic fixed power button 77 lid swi
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objects _ BMC (Battery Maintenance
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transitioning working to soft-off s
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power resources battery management
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definition 22 table fields 115 RTC_
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protocols 650, 662, 669 Read/Write
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top of memory 704 ToString (Convert
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Advanced Configuration and Power Interface Specification

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