FAH4840-269128 Datasheet, PDF (8/21 Pages) List of Unclassifed Manufacturers – FAH4840 Haptic Driver for Linear Resonant Actuators (LRAs)

Writing
All writes must be preceded by a pointer set, even if the
pointer is already pointing to the desired register.
Immediately following the pointer set, the master must
begin transmitting the data to be written. After
transmitting each byte of data, the master must release
the Serial Data (SDA) line for one clock cycle to allow
the FAH4840 to acknowledge receiving the byte. The
write operation should be terminated by a STOP
condition from the master (see Figure 8).
As with reading, the master can write multiple bytes by
continuing to send data. The FAH4840 increments the
pointer by one and accepts data for the next register.
The master indicates the last data byte by issuing a
STOP condition.
Read / Write Diagrams
SCL
SDA
A7 A6 A5 A4 A3 A2 A1 R/W ACK D7 D6 D5 D4 D3 D2 D1 D0 NACK
START
(from Master)
Slave Address
(from Master)
ACK
(from Slave)
Figure 6.
Data
(from Slave)
NACK
(from Master)
I²C Read
STOP
(from Master)
SCL
SDA
A7 A6 A5 A4 A3 A2 A1 R/W ACK D7 D6 D5 D4 D3 D2 D1 D0 ACK D7 D6 D5 D4 D3 D2 D1 D0 NACK
START
(from Master)
Slave Address
(from Master)
ACK
(from Slave)
Figure 7.
Data
(from Slave)
ACK
(from Master)
I²C Multiple Byte Read
Data
(from Slave)
NACK
(from Master)
STOP
(from Master)
SCL
SDA
A7 A6 A5 A4 A3 A2 A1 R/W ACK P7 P6 P5 P4 P3 P2 P1 P0 ACK D7 D6 D5 D4 D3 D2 D1 D0 ACK
START
(from Master)
Slave Address
(from Master)
ACK
(from Slave)
Pointer
(from Master)
ACK
(from Slave)
Figure 8. I²C Write
Data
(from Master)
ACK
(from Slave)
STOP
(from Master)
SCL
SDA
A7 A6 A5 A4 A3 A2 A1 R/W ACK P7 P6 P5 P4 P3 P2 P1 P0 ACK
A7 A6 A5 A4
START
(from Master)
Slave Address
(from Master)
ACK
(from Slave)
Pointer
(from Master)
ACK
(from Slave)
Repeat START Slave Address
(from Master)
(from Master)
A3 A2 A1 R/W ACK D7 D6 D5 D4 D3 D2 D1 D0 NACK
Figure 9.
Slave Address
(from Master)
ACK
(from Slave)
I²C Write Followed by Read
Data
(from Slave)
NACK
(from Master)
STOP
(from Master)
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