PCA9533DP02 データシートの表示（PDF） - Philips Electronics
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PCA9533DP02 Datasheet PDF : 18 Pages
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Philips Semiconductors
4-bit I2C LED dimmer
Product data sheet
PCA9533
DEVICE ADDRESSING
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 3 and PCA9533/02 in Figure 4.
SLAVE ADDRESS
1 1 0 0 0 1 0 R/W
SW01037
Figure 3. Slave address — PCA9533/01
SLAVE ADDRESS
1 1 0 0 0 1 1 R/W
SW01038
Figure 4. Slave address — PCA9533/02
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.
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.
0 0 0 AI 0 B2 B1 B0
RESET STATE: 00h
REGISTER ADDRESS
AUTO-INCREMENT FLAG
Figure 5. Control register
SW01034
The lowest 3 bits are used as a pointer to determine which register
will be accessed.
If the auto-increment 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 0).
Only the 3 least significant bits are affected by the AI flag.
Unused bits must be programmed with zeroes.
CONTROL REGISTER DEFINITION
B2
B1
B0
REGISTER
NAME
TYPE
000
INPUT
READ
001
010
011
100
101
PSC0
PWM0
PSC1
PWM1
LS0
READ/
WRITE
READ/
WRITE
READ/
WRITE
READ/
WRITE
READ/
WRITE
REGISTER
FUNCTION
INPUT
REGISTER
FREQUENCY
PRESCALER 0
PWM
REGISTER 0
FREQUENCY
PRESCALER 1
PWM
REGISTER 1
LED SELECTOR
REGISTER DESCRIPTION
INPUT — INPUT REGISTER
bit
7
6
5
Default 0
0
0
LED LED LED LED
3
2
1
0
4
3
2
1
0
0
X
X
X
X
The INPUT register reflects the state of the device pins. Writes to
this register will be acknowledged but will have no effect.
NOTE: The default value “X” is determined by the externally applied
logic level, normally ‘1’ when used for directly driving LED with
pull-up to VDD.
PSC0 — FREQUENCY PRESCALER 0
bit
7
6
5
4
3
2
1
0
default 0
0
0
0
0
0
0
0
PSC0 is used to program the period of the PWM output.
The
period
of
BLINK0
+
(PSC0 )
152
1)
PWM0 — PWM REGISTER 0
bit
7
6
5
4
3
2
1
0
default 1
0
0
0
0
0
0
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 is:
PWM0
256
PSC1 — FREQUENCY PRESCALER 1
bit
7
6
5
4
3
2
1
0
default 0
0
0
0
0
0
0
0
PSC1 is used to program the period of PWM output.
The
period
of
BLINK1
+
(PSC1 )
152
1)
2004 Oct 01
4
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