ltc1760 Linear Technology Corporation, ltc1760 Datasheet - Page 22

• Manufacturer Part Number: ltc1760
• Description: Dual Smart Battery System Manager
• Manufacturer: Linear Technology Corporation

LTC1760
OPERATIO
2.5 LTC1760 SMBus Controller Operation
SMBus communication with the LTC1760 is handled by
the SMBus Controller, a sub-block of the SMBus Interface.
Data is clocked into the SMBus Controller block shift
register after the rising SCL edge. Data is clocked out of the
SMBus Control block shift register after the falling edge of
SCL.
The LTC1760 acting as a slave will acknowledge (ACK)
each byte of serial data. The Command byte will be
NACKed if an invalid command code is transmitted to the
LTC1760. The SMBus Controller must respond if ad-
dressed as a combined Smart Battery System Manager
(Address 14). A valid address includes a legal Read/Write
bit. The SMBus Controller will ignore invalid data although
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*SMB INCLUDES SCL AND SDA, SMB1 INCLUDES SCL1 AND SDA1, AND SMB2 INCLUDES SCL2 AND SDA2.
HOST
HOST
HOST, LTC1760 AND BAT1 CAN COMMUNICATE.
BAT2 ORIGINATED COMMANDS ARE IGNORED.
HOST, LTC1760 AND BAT2 CAN COMMUNICATE.
BAT1 ORIGINATED COMMANDS ARE IGNORED.
Figure 1. Switch Configurations Used by the LTC1760 for Managing Dual Port Battery Communication
SMB*
SMB*
CONTROLLER
CONTROLLER
U
LTC1760
LTC1760
SMBus
SMBus
(1a)
(1c)
SMB2*
SMB1*
SMB2*
SMB1*
BAT2
BAT1
BAT2
BAT1
the data transmission with the invalid data will still be
ACK’ed.
When the LTC1760, acting as a bus master receives a
NACK, it will terminate the transmission and provide a
STOP condition on the bus.
Detection of a STOP condition, power on reset, or SMBus
time-out will reset the controller to an initial state at any
time.
The LTC1760 supports ARA, Word Write and Word Read
protocols as an SMBus slave. The LTC1760 supports
Word Read protocol as an SMBus master.
Refer to “System Management Bus Specification” for
complete description of required operation and symbols.
HOST
HOST
LTC1760 AND BAT2 CAN COMMUNICATE. HOST AND
BAT1 ORIGINATED COMMANDS ARE STRETCHED IF
THE LTC1760 IS COMMUNICATING WITH BAT2.
LTC1760 AND BAT1 CAN COMMUNICATE. HOST AND
BAT2 ORIGINATED COMMANDS ARE STRETCHED IF
THE LTC1760 IS COMMUNICATING WITH BAT1.
SMB*
SMB*
CONTROLLER
CONTROLLER
LTC1760
LTC1760
SMBus
SMBus
(1b)
(1d)
SMB2*
SMB1*
SMB2*
SMB1*
BAT2
BAT1
BAT2
BAT1
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