CAT9552 ONSEMI [ON Semiconductor], CAT9552 Datasheet - Page 11

• Manufacturer Part Number: CAT9552
• Description: 16-Channel I2C-bus LED Driver with Programmable Blink Rate
• Manufacturer: ONSEMI [ON Semiconductor]

External Reset Operation
The CAT9552 registers and the I
initialized to their default state when the RESET input
is held low for a minimum of t
will be held in their default state until RESET returns
to a logic HIGH state. The external Reset timing is
shown in Figure 9.
READ FROM
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Characteristics subject to change without notice
DATA INTO
PORT
PORT
SDA
RESET
LEDx
SDA
SCL
Start Condition
S
50%
1
1
t
REC
Slave Address
0
START
DATA 1
0
30%
Figure 8. Read Input Port Register Timing Diagram
A2
W
. CAT9552’s registers
2
A1 A0
C state machine are
t
R/W
ph
Figure 9. RESET
A
Acknowledge
From Slave
DATA 2
¯¯¯¯¯¯ Timing Diagram
Data From Port
11
DATA 1
DATA 3
Power-On Reset Operation
The CAT9552 incorporates Power-On Reset (POR)
circuitry which protects the internal logic against
powering up in the wrong state. The device is in a
reset state for V
threshold level (V
level, the reset state is released and the CAT9552
internal state machine and registers are initialized to
their default state. Thereafter V
below 0.2V to reset the device.
t
ps
50%
A
Acknowledge
From Master
ACK OR READ CYCLE
t
W
t
t
POR
RESET
RESET
CC
50%
). When V
Data From Port
less than the internal POR
DATA 4
50%
DATA 4
LED OFF
No Acknowledge
CC
From Master
CC
exceeds the V
must be taken
Doc. No. MD-9005 Rev D
NA
CAT9552
Stop
Condition
P
POR