PCA9533D/02,118 Datasheet PCA9533D/01,118, PCA9533DP/01,118, PCA9533DP/02,118 | P10-P12

Product data sheet Rev. 03 — 27 April 2009 10 of 24

NXP Semiconductors

PCA9533

4-bit I

C-bus LED dimmer

7.4 Bus transactions

Fig 11. Write to register

0 AS

slave address (PCA9533/01)

START condition R/W acknowledge

from slave

002aae629

0 0 AI 0 B2B1B00

command byte

acknowledge

from slave

12345678SCL 9

SDA DATA 1 A

write to register

data out from port

v(Q)

acknowledge

from slave

DATA 1 VALID

data to register

1000101

Fig 12. Read from register

1000100AS1

START condition R/W

acknowledge

from slave

002aae630

acknowledge

from slave

SDA

A P

acknowledge

from master

data from register

DATA (first byte)

slave address (PCA9533/01)

STOP

condition

(repeated)

START condition

(cont.)

1 A

R/W

acknowledge

from slave

slave address (PCA9533/01)

at this moment master-transmitter becomes master-receiver

and slave-receiver becomes slave-transmitter

no acknowledge

from master

data from register

DATA (last byte)

command byte

0 0 AI 0 B2 B10B0

Auto-Increment

if AI = 1

1000101

Remark: This ﬁgure assumes the command byte has previously been programmed with 00h.

Fig 13. Read input port register

1000101AS1

START condition R/W acknowledge

from slave

002aae631

acknowledge

from master

SDA NA

read from

port

data into

port

h(D)

data from port

no acknowledge

from master

data from port

DATA 4

slave address (PCA9533/01)

DATA 1

STOP

condition

DATA 2 DATA 3 DATA 4

su(D)

DATA 1

Product data sheet Rev. 03 — 27 April 2009 11 of 24

NXP Semiconductors

PCA9533

4-bit I

C-bus LED dimmer

8. Application design-in information

8.1 Minimizing I

when the I/Os are used to control LEDs

When the I/Os are used to control LEDs, they are normally connected to V

through a

resistor as shown in Figure 14. Since the LED acts as a diode, when the LED is off the

I/O V

is about 1.2 V less than V

. The supply current, I

, increases as V

becomes

lower than V

and is speciﬁed as ∆I

in Table 13 “Static characteristics”.

Designs needing to minimize current consumption, such as battery power applications,

should consider maintaining the I/O pins greater than or equal to V

when the LED is off.

Figure 15 shows a high value resistor in parallel with the LED. Figure 16 shows V

less

than the LED supply voltage by at least 1.2 V. Both of these methods maintain the I/O V

at or above V

and prevents additional supply current consumption when the LED is off.

Fig 14. Typical application

PCA9533

LED0

LED1

SDA

SCL

5 V

C-BUS/SMBus

MASTER

002aae632

SDA

SCL

5 V

LED2

LED3

10 kΩ10 kΩ

Fig 15. High value resistor in parallel with

the LED

Fig 16. Device supplied by a lower voltage

002aac189

LED

LEDn

100 kΩ

002aac190

LED

LEDn

3.3 V 5 V

Product data sheet Rev. 03 — 27 April 2009 12 of 24

NXP Semiconductors

PCA9533

4-bit I

C-bus LED dimmer

8.2 Programming example

The following example will show how to set LED0 and LED1 off. It will set LED2 to blink at

1 Hz at a 50 % duty cycle. LED3 will be set to be dimmed at 25 % of their maximum

brightness (duty cycle = 25 %). PCA9533/01 is used in this example.

9. Limiting values

Table 11. Programming PCA9533

Program sequence I

C-bus

START S

PCA9533 address C4h

PSC0 subaddress + Auto-Increment 11h

Set prescaler PSC0 to achieve a period of 1 second:

PSC0 = 151

97h

Set PWM0 duty cycle to 50 %:

PWM0 = 128

80h

Set prescaler PCS1 to dim at maximum frequency:

PSC1 = 0

00h

Set PWM1 output duty cycle to 25 %:

PWM1 = 64

40h

Set LED0 on, LED1 off; LED2 set to blink at PSC0, PWM0; LED3 set to blink at

PSC1, PWM1

E1h

STOP P

Blink period 1

PSC0 1+

152

------------------------

PWM0

256

-----------------

0.5=

Blink period max=

PWM1

256

-----------------

0.25=

Table 12. Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134).

Symbol Parameter Conditions Min Max Unit

supply voltage −0.5 +6.0 V

I/O

voltage on an input/output pin V

− 0.5 5.5 V

O(LEDn)

output current on pin LEDn - 25 mA

ground supply current - 100 mA

tot

total power dissipation - 400 mW

stg

storage temperature −65 +150 °C

amb

ambient temperature operating −40 +85 °C

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24

PCA9533D/02,118

Mfr. #:

Buy PCA9533D/02,118

Manufacturer:

NXP Semiconductors

Description:

LED Lighting Drivers PCA9533D/SO8//02/REEL 13 Q1 NDP

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New from this manufacturer.

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PCA9533D/02,118

PCA9533D/02,118

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