THC7984 Datasheet, PDF (43/45 Pages) THine Electronics, Inc. – 10-bit 3-channel Video Signal Digitizer

THC7984_Rev.2.0_E
2-wire Serial Interface
Start condition
SCL
< 2-wire Serial Interface Protocol >
9 cycle
9 cycle
SDA
I6 I5
I0 R/W A D7 D6
D1 D0 A D7
DEVICE ID
R/W ACK
9 cycle
REGISTER ADDRESS
WRITE DATA
READ DATA
9 cycle
ACK
Stop condition
D7 D6
D1 D0 A D7 D6
D1 D0 A/A
-WRITE CYCYLE-
S
DEVICE ID
ACK
0
W A REGISTER ADDRESS A WRITE DATA A
ACK
AP
-READ CYCYLE-
S
DEVICE ID
S
DEVICE ID
0
W A REGISTER ADDRESS A
1
R A READ DATA A
AP
S: Start condition P: Stop condition
W: Write (Low) R: Read (High) A: Acknowledge (Low) A: Not acknowledge (High)
From Master to THC7984
From THC7984 to Master
* The THC7984 operates as a slave device.
* While SCL is High, SDA must be stable. SDA can change when SCL is Low. (except for start/end conditions)
* A SDA High to Low transition when SCL is High defines "Start condition". A SDA Low to High transition when SCL
is High defines "Stop condition".
* In write or read cycle, whenever data is written or read, the register address (address pointer) is incremented. The
address pointer is hold when the write cycle ends. However, The address pointer is undefined when the read cycle ends.
* To read the register data, specify a register address by the write cycle, and read the data by read cycle.
* Embedded watch dog timer monitors SCL transitions. When SCL stays High more than 39ms (min.) or stays Low
more than 19ms (min.) , 2-wire serial interface is reset to initial state (this is different from chip reset) .
< 2-wire Serial Interface Timing >
SDA
SCL
t_BUFF
t_STAH
STOP START
t_DHO
t_DAH
t_DSU
t_DAL
Tf
t_STASU
START
t_STOSU
STOP
VIHmin=1.4V
VILmax=0.8V
VIHmin=1.4V
VILmax=0.8V
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THine Electronics, Inc.