PCA9550D NXP Semiconductors, PCA9550D Datasheet - Page 12

• Manufacturer Part Number: PCA9550D
• Description: LED Drivers 2-BIT I2C FM OD LED BLK RST
• Manufacturer: NXP Semiconductors

Specifications of PCA9550D

• Number Of Segments: 2
• Low Level Output Current: 24000 uA (Min)
• Operating Supply Voltage: 2.3 V to 5.5 V
• Maximum Supply Current: 500 uA
• Maximum Power Dissipation: 400 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-96
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: PCA9550D,112

NXP Semiconductors
9. Limiting values
PCA9550_5
Product data sheet
8.2 Programming example
The following example will show how to set LED0 to blink at 1 Hz at a 50 % duty cycle.
LED1 will be set to blink at 4 Hz and at a 25 % duty cycle.
Table 11.
Table 12.
In accordance with the Absolute Maximum Rating System (IEC 60134).
Program sequence
START
PCA9550 address with A0 = LOW
PSC0 subaddress + Auto-Increment
Set prescaler PSC0 to achieve a period of 1 second:
PSC0 = 43
Set PWM0 duty cycle to 50 %:
PWM0 = 128
Set prescaler PSC1 to achieve a period of 0.25 seconds:
PSC1 = 10
Set PWM1 output duty cycle to 25 %:
PWM1 = 192
Set LED0 to PWM0, and set LED1 to blink at PWM1
STOP
Symbol
V
V
I
I
P
T
T
O(LEDn)
SS
stg
amb
DD
I/O
tot
Blink period
256 PWM0
--------------------------------
Blink period
256 PWM1
--------------------------------
–
–
256
256
Programming PCA9550
Limiting values
Parameter
supply voltage
voltage on an input/output pin
output current on pin LEDn
ground supply current
total power dissipation
storage temperature
ambient temperature
=
=
=
=
0.5
0.25
1
0.25
=
PSC0
----------------------- -
Rev. 05 — 13 October 2008
=
PSC1
----------------------- -
44
+
44
1
+
2-bit I
1
2
C-bus LED driver with programmable blink rates
Conditions
operating
Min
V
-
-
-
0.5
65
40
SS
0.5
PCA9550
© NXP B.V. 2008. All rights reserved.
Max
+6.0
5.5
50
400
+150
+85
I
S
C0h
11h
2Bh
80h
0Ah
C0h
0Eh
P
25
2
C-bus
12 of 26
Unit
V
V
mA
mA
mW
C
C