DS2790 Maxim Integrated Products, DS2790 Datasheet - Page 29

• Manufacturer Part Number: DS2790
• Description: Programmable 1-Cell Li-Ion Fuel Gauge and Protector
• Manufacturer: Maxim Integrated Products

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Figure 10. 2-Wire Communication Examples
4
I
I
DS2790 Software POR Sequence
DS2790 2-Wire Programming Request
2
2
S
S
S
S
C/SMBus Write Data Sequence
C/SMBus Read Data Sequence
Address
Address
Address
Address
Slave
Slave
Slave
Slave
Master to Slave
Slave to Master
Potential Clock Extension if Cmd Release Latch Clear,
Potential Clock Extension if Cmd Release Latch Clear,
Wr Ack
Wr Ack
Wr Ack
Wr Ack
Command Enable
Command Enable
Command
Command
Byte
Byte
FEh
FEh
CMD_HM_DIS = 0,
CMD_HM_DIS = 0,
and CMD_HM = 0
and CMD_HM = 0
Ack
Ack
Ack
Ack
Data Byte
P
P
Byte 1
Data
1
S
S
Address
Address
Ack
Ack
Slave
Slave
...
...
DS2790 Programmable 1-Cell Li-Ion Fuel Gauge and Protector
Data Byte
Data Byte
Wr Ack
Wr Ack
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Initiate Programming over
8
n
Repeated FEh Generates
the 2-Wire Interface
Potential Clock Extension when RXD is full .
Software POR
Ack
Ack
FEh
FDh
Data Byte
S
9
Address
Ack
Ack
Slave
Ack
P
P
Rd
Potential Clock Extension when TXD is empty.
P
Ack
2-Wire Programming
Sequence Begins
Data Byte
1
Ack
Data Byte
2
...
Nack
P