UPD64084 NEC, UPD64084 Datasheet - Page 13

• Manufacturer Part Number: UPD64084
• Description: THREE-DIMENSIONAL Y/C SEPARATION LSI WITH ON-CHIP MEMORY
• Manufacturer: NEC

2.4
interface releases its SDA line and becomes operative. In addition, its write register is previously loaded with an initial
value.
Caution
It is necessary to reset the I
<1> When the power is switched on, wait until the power supply line reaches and settles on a 3.3-V/2.5-V level
<2> Initialize the I
<3> Start communication on the I
DVDDIO
DVDD
Start-up of Power Supply and Reset
RSTB
before starting initialization.
Reset is always necessary whether using the serial bus register or not.
3.3 V
2.5 V
3.3 V
0 V
0 V
0 V
Power ON
2
C bus interface circuit by keeping the RSTB pin at a low level for at least 10 s.
2
C bus interface immediately when it is supplied with power. When reset, the I
Don't care
Figure 2-2. I
2
C bus interface after 100 s from pull up the RSTB pin to a high level.
3.3 V start-up
2.5 V start-up
I
2
C bus access disable
RSTB='L'
Data Sheet S16021EJ2V0DS
2
C Bus Interface Reset Sequence
10
s MIN.
RSTB='H'
100
Serial bus register data setting
s MIN.
I
2
C bus access enable
3.3 V cut-off
2.5 V cut-off
PD64084
2
C bus
13