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CAT9532
External Reset Operation
The CAT9532 registers and the I 2 C state machine are
initialized to their default state when the RESET input is
held low for a minimum of t W . The external Reset timing is
shown in Figure 13.
LED Output Operation
Figure 11 shows typical current values for LED pin
voltages at various case temperatures.
30
VCC = 5 V
25
20
15
Power ? On Reset Operation
The CAT9532 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 CC
less than the internal POR threshold level (V POR ). When
V CC exceeds the V POR level, the reset state is released and
the CAT9532 internal state machine and registers are
initialized to their default state.
T = ? 45 ° C
T = 25 ° C
10
T = 90 ° C
5
0
0
100
200
300
400
VOL (mV)
Figure 11. IOL vs VOL for LED Pin
Slave Address
Data From Port
Data From Port
SDA
S
1
1
0
0 A2 A1 A0
A
DATA 1
A
DATA 4
NA P
READ FROM
PORT
Start Condition
R/W
Acknowledge
From Slave
Acknowledge
From Master
No Acknowledge
From Master
Stop
Condition
DATA INTO
PORT
DATA 1
DATA 2
DATA 3
DATA 4
t ph
t ps
Figure 12. Read Input Port Register Timing Diagram
SCL
START
ACK OR READ CYCLE
SDA
30%
t RESET
RESET
50%
t REC
50%
t W
50%
t RESET
LEDx
Figure 13. RESET Timing Diagram
http://onsemi.com
10
50% LED OFF
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