PCA9533DP/01,118 Datasheet PCA9533D/01,118, PCA9533DP/01,118, PCA9533DP/02,118 | P4-P6

Product data sheet Rev. 03 — 27 April 2009 4 of 24

NXP Semiconductors

PCA9533

4-bit I

C-bus LED dimmer

6. Functional description

Refer to Figure 1 “Block diagram of PCA9533”.

6.1 Device address

Following a START condition, the bus master must output the address of the slave it is

accessing. The address of the PCA9533/01 is shown in Figure 4 and the address of

PCA9533/02 is shown in Figure 5.

The last bit of the address byte deﬁnes the operation to be performed. When set to logic 1

a read is selected, while a logic 0 selects a write operation.

6.2 Control register

Following the successful acknowledgement of the slave address, the bus master will send

a byte to the PCA9533, which will be stored in the Control register.

The lowest 3 bits are used as a pointer to determine which register will be accessed.

If the Auto-Increment (AI) ﬂag is set, the three low order bits of the Control register are

automatically incremented after a read or write. This allows the user to program the

registers sequentially. The contents of these bits will rollover to ‘000’ after the last register

is accessed.

When Auto-Increment ﬂag is set (AI = 1) and a read sequence is initiated, the sequence

must start by reading a register different from the INPUT register (B2 B1 B0 ≠ 0 0 0).

Only the 3 least signiﬁcant bits are affected by the AI ﬂag. Unused bits must be

programmed with zeroes.

SCL 6 serial clock line

SDA 7 serial data line

8 supply voltage

Table 3. Pin description

…continued

Symbol Pin Description

Fig 4. PCA9533/01 slave address Fig 5. PCA9533/02 slave address

002aae627

1 1 0 0 0 1 0 R/W

slave address

002aae628

1 1 0 0 0 1 1 R/W

slave address

Reset state: 00h

Fig 6. Control register

002aad744

0 0 0 AI 0 B2 B1

Auto-Increment

flag

Product data sheet Rev. 03 — 27 April 2009 5 of 24

NXP Semiconductors

PCA9533

4-bit I

C-bus LED dimmer

6.2.1 Control register deﬁnition

6.3 Register descriptions

6.3.1 INPUT - Input register

The INPUTregister reﬂects the state of the device pins. Writes to this register will be

acknowledged but will have no effect.

Remark: The default value ‘X’ is determined by the externally applied logic level (normally

logic 1) when used for directly driving LED with pull-up to V

6.3.2 PCS0 - Frequency Prescaler 0

PSC0 is used to program the period of the PWM output.

The period of BLINK0 = (PSC0 + 1) / 152.

6.3.3 PWM0 - Pulse Width Modulation 0

The PWM0 register determines the duty cycle of BLINK0. The outputs are LOW (LED on)

when the count is less than the value in PWM0 and HIGH (LED off) when it is greater. If

PWM0 is programmed with 00h, then the PWM0 output is always HIGH (LED off).

The duty cycle of BLINK0 = PWM0 / 256.

Table 4. Register summary

B2 B1 B0 Symbol Access Description

0 0 0 INPUT read only input register

0 0 1 PSC0 read/write frequency prescaler 0

0 1 0 PWM0 read/write PWM register 0

0 1 1 PSC1 read/write frequency prescaler 1

1 0 0 PWM1 read/write PWM register 1

1 0 1 LS0 read/write LED selector

Table 5. INPUT - Input register description

Bit 7 6 5 4 3 2 1 0

Symbol ----LED3 LED2 LED1 LED0

Default 0000XXXX

Table 6. PSC0 - Frequency Prescaler 0 register description

Bit 7 6 5 4 3 2 1 0

Symbol PSC0[7] PSC0[6] PSC0[5] PSC0[4] PSC0[3] PSC0[2] PSC0[1] PSC0[0]

Default 00000000

Table 7. PWM0 - Pulse Width Modulation 0 register description

Bit 7 6 5 4 3 2 1 0

Symbol PWM0

[7]

PWM0

[6]

PWM0

[5]

PWM0

[4]

PWM0

[3]

PWM0

[2]

PWM0

[1]

PWM0

[0]

Default 10000000

Product data sheet Rev. 03 — 27 April 2009 6 of 24

NXP Semiconductors

PCA9533

4-bit I

C-bus LED dimmer

6.3.4 PCS1 - Frequency Prescaler 1

PSC1 is used to program the period of the PWM output.

The period of BLINK1 = (PSC1 + 1) / 152.

6.3.5 PWM1 - Pulse Width Modulation 1

The PWM1 register determines the duty cycle of BLINK1. The outputs are LOW (LED on)

when the count is less than the value in PWM1 and HIGH (LED off) when it is greater. If

PWM1 is programmed with 00h, then the PWM1 output is always HIGH (LED off).

The duty cycle of BLINK1 = PWM1 / 256.

6.3.6 LS0 - LED selector

The LSn LED selector register determines the source of the LED data.

00 = output is set high-impedance (LED off; default)

01 = output is set LOW (LED on)

10 = output blinks at PWM0 rate

11 = output blinks at PWM1 rate

Table 8. PSC1 - Frequency Prescaler 1 register description

Bit 7 6 5 4 3 2 1 0

Symbol PSC1[7] PSC1[6] PSC1[5] PSC1[4] PSC1[3] PSC1[2] PSC1[1] PSC1[0]

Default 00000000

Table 9. PWM1 - Pulse Width Modulation 1 register description

Bit 7 6 5 4 3 2 1 0

Symbol PWM1

[7]

PWM1

[6]

PWM1

[5]

PWM1

[4]

PWM1

[3]

PWM1

[2]

PWM1

[1]

PWM1

[0]

Default 10000000

Table 10. LS0 - LED selector register bit description

Legend: * default value.

LS0 7:6 00* LED3 selected

5:4 00* LED2 selected

3:2 00* LED1 selected

1:0 00* LED0 selected

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

PCA9533DP/01,118

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Manufacturer:

NXP Semiconductors

Description:

LED Lighting Drivers I2C LED DIMMER 4BIT

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PCA9533DP/01,118

PCA9533DP/01,118

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