PCA9550D NXP Semiconductors, PCA9550D Datasheet - Page 4

• 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
6. Functional description
PCA9550_5
Product data sheet
6.1 Device address
6.2 Control register
Refer to
Following a START condition, the bus master must output the address of the slave it is
accessing. The address of the PCA9550 is shown in
internal pull-up resistor is incorporated on the hardware selectable address pin and it must
be pulled HIGH or LOW.
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.
Following the successful acknowledgement of the slave address, the bus master will send
a byte to the PCA9550, 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 the 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
Only the 3 least significant bits are affected by the AI flag. Unused bits must be
programmed with zeroes.
Fig 5.
Fig 6.
Figure 1 “Block diagram of
PCA9550 slave address
Reset state: 00h
Control register
000).
Rev. 05 — 13 October 2008
Auto-Increment flag
2-bit I
1
0
1
0
PCA9550”.
2
C-bus LED driver with programmable blink rates
slave address
0
0
fixed
AI
0
0
0
register address
B2
0
selectable
hardware
Figure
A0 R/W
002aad242
B1
002aad243
B0
5. To conserve power, no
PCA9550
© NXP B.V. 2008. All rights reserved.
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