PCA9550D NXP Semiconductors, PCA9550D Datasheet - Page 8

• 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
7. Characteristics of the I
PCA9550_5
Product data sheet
7.1.1 START and STOP conditions
7.1 Bit transfer
7.2 System configuration
The I
lines are a serial data line (SDA) and a serial clock line (SCL). Both lines must be
connected to a positive supply via a pull-up resistor when connected to the output stages
of a device. Data transfer may be initiated only when the bus is not busy.
One data bit is transferred during each clock pulse. The data on the SDA line must remain
stable during the HIGH period of the clock pulse as changes in the data line at this time
will be interpreted as control signals (see
Both data and clock lines remain HIGH when the bus is not busy. A HIGH-to-LOW
transition of the data line while the clock is HIGH is defined as the START condition (S).
A LOW-to-HIGH transition of the data line while the clock is HIGH is defined as the STOP
condition (P) (see
A device generating a message is a ‘transmitter’; a device receiving is the ‘receiver’. The
device that controls the message is the ‘master’ and the devices which are controlled by
the master are the ‘slaves’ (see
Fig 7.
Fig 8.
2
C-bus is for 2-way, 2-line communication between different ICs or modules. The two
SDA
SCL
Bit transfer
Definition of START and STOP conditions
START condition
2
SDA
SCL
Figure
C-bus
S
Rev. 05 — 13 October 2008
8).
2-bit I
Figure
data valid
data line
stable;
2
C-bus LED driver with programmable blink rates
9).
Figure
allowed
change
of data
7).
STOP condition
mba607
P
PCA9550
© NXP B.V. 2008. All rights reserved.
mba608
SDA
SCL
8 of 26