PCA9553D/01 NXP Semiconductors, PCA9553D/01 Datasheet - Page 12

• Manufacturer Part Number: PCA9553D/01
• Description: LED Drivers LED DRVR 4BIT I2C
• Manufacturer: NXP Semiconductors

Specifications of PCA9553D/01

• Number Of Segments: 4
• Low Level Output Current: 25000 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: PCA9553D/01,112

NXP Semiconductors
PCA9553_6
Product data sheet
9.2 Programming example
The following example shows how to set LED0 and LED1 off. It will then set LED2 to blink
at 1 Hz, 50 % duty cycle. LED3 will be set to blink at 4 Hz, 25 % duty cycle. PCA9553/01
is used in this example.
Table 11.
Program sequence
START
PCA9553 address
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 on, LED1 off, LED2 set to blink at PSC0, PWM0, LED3 set to blink at
PSC1, PWM1
STOP
Fig 16. High value resistor in parallel with
Blink period
256 PWM0
--------------------------------
Blink period
256 PWM1
--------------------------------
–
–
256
256
the LED
V
Programming PCA9553
DD
LEDn
=
=
=
=
0.5
0.25
1
0.25
=
Rev. 06 — 29 December 2008
PSC0
----------------------- -
=
PSC1
----------------------- -
LED
44
+
44
1
+
4-bit I
002aac189
100 k
1
V
DD
2
C-bus LED driver with programmable blink rates
Fig 17. Device supplied by a lower voltage
3.3 V
V
DD
LEDn
PCA9553
5 V
002aac190
© NXP B.V. 2008. All rights reserved.
I
S
C4h
11h
2Bh
80h
0Ah
C0h
E4h
P
2
LED
C-bus
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