AK8456 Datasheet, PDF (19/32 Pages) Asahi Kasei Microsystems – 3 channel input 16bit 30MSPS Video ADC with LED driver

 Serial Interface
[AK8456]
Control registers are accessed through serial interface. The control registers are readable.
If SDENB is low, it is possible to access registers. Input address and data into SDATA. SDATA is
captured by SCLK rising edge.
Write
The first bit of SDATA is 0, data is written to register. From second bit to fourth bit must be
0. From fifth bit to eighth bit are address bits. The fifth bit is most significant bit of address.
From ninth bit to sixteenth bit are data bit.
Data is written into register by rising edge of SDENB. If rising edge of SCLK is less than
sixteen, data isn't written into register. If rising edge of SCLK is more than seventeen, front
sixteen bits are effective.
SDENB
SCLK
SDATA
0 0 0 0 A3 A2 A1 A0 B7 B6 B5 B4 B3 B2 B1 B0
Fig.20 Write to Register
Read
The first bit of SDATA is 1, data is read from register. From second bit to fourth bit must be 0. From
fifth bit to eighth bit are address bits. The fifth bit is most significant bit of address. Data is output
from the SCLK falling after SCLK rising incorporating an eighth bit. SDATA pin is used as an input
again if SDENB become high level. If there is a SCLK 17 or more times, read data after the B0 is
output is 0.
SDENB
SCLK
SDATA
1 0 0 0 A3 A2 A1 A0 B7 B6 B5 B4 B3 B2 B1 B0
Input
Fig.21 Read from Register
Output
Input
014002433-E-00
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2014/06