PCA9552BS-PCA9552PW Fast Delivery |IC PHOENIX CO.,LIMITED

PCA9552BS ,16-bit I2C-bus LED driver with programmable blink ratesPin configuration — SO, TSSOP Figure 2.
PCA9552PW ,16-bit I2C LED driver with programmable blink ratesPIN CONFIGURATION — SO, TSSOP
PCA9553D/01 ,PCA9553; 4-bit I²C LED driver with programmable blink rates
PCA9553D/01 ,PCA9553; 4-bit I²C LED driver with programmable blink rates
PCA9553DP/02 ,PCA9553; 4-bit I²C LED driver with programmable blink rates
PCA9553TK ,4-bit I2C-bus LED driver with programmable blink ratesFeaturesn 4 LED drivers (on, off, ﬂashing at a programmable rate)n 2 selectable, fully programmable ..
PESD5V0S1BSF ,Ultra low profile bidirectional low capacitance ESD protection diodeApplications Cellular handsets and accessories Portable electronics Communication systems Compu ..
PESD5V0S1UA ,Unidirectional ESD protection for transient voltage suppressionApplicationsn Computers and peripherals n Communication systemsn Audio and video equipment n Portab ..
PESD5V0S1UB ,ESD protection diodes in SOD523 packagePESDxS1UB seriesESD protection diodes in SOD523 packageRev. 02 — 24 August 2009 Product data sheet1 ..
PESD5V0S1UL ,Unidirectional ESD protection diodesLimiting values Table 5.
PESD5V0S1UL ,Unidirectional ESD protection diodesFeatures and benefits  Ultra small SMD plastic package Ultra low leakage current: I <700 nARM ES ..
PESD5V0S2UAT ,Double ESD protection diodes in SOT23 packageFEATURES QUICK REFERENCE DATA• Unidirectional ESD protection of up to two linesSYMBOL PARAMETER VAL ..

PCA9552BS-PCA9552PW
16-bit I2C LED driver with programmable blink rates
Product data sheet
Supersedes data of 2003 May 02
2004 Oct 01
Philips Semiconductors Product data sheet
PCA955216-bit I2 C LED driver with
programmable blink rates
FEATURES 16 LED drivers (on, off, flashing at a programmable rate) 2 selectable, fully programmable blink rates (frequency and duty
cycle) between 0.172 Hz and 44 Hz (5.82 and 0.023 seconds) Input/outputs not used as LED drivers can be used as regular
GPIOs Internal oscillator requires no external components I2C-bus interface logic compatible with SMBus Internal power-on reset Noise filter on SCL/SDA inputs Active-LOW reset input 16 open drain outputs directly drive LEDs to 25 mA Edge rate control on outputs No glitch on power-up Supports hot insertion Low stand-by current Operating power supply voltage range of 2.3 V to 5.5 V 0 to 400 kHz clock frequency ESD protection exceeds 2000 V HBM per JESD22-A114,
150 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101 Latch-up testing is done to JESDEC Standard JESD78 which
exceeds 100 mA Packages offered: SO24, TSSOP24, HVQFN24
DESCRIPTION
The PCA9552 LED Blinker blinks LEDs in I2 C-bus and SMBus
applications where it is necessary to limit bus traffic or free up the2 C Master’s (MCU, MPU, DSP, chipset, etc.) timer. The uniqueness
of this device is the internal oscillator with two programmable blink
rates. To blink LEDs using normal I/O Expanders like the PCF8574
or PCA9554, the bus master must send repeated commands to turn
the LED on and off. This greatly increases the amount of traffic on
the I2C-bus and uses up one of the master’s timers. The PCA9552
LED Blinker instead requires only the initial set up command to
program BLINK RATE 1 and BLINK RATE 2 (i.e., the frequency and
duty cycle) for each individual output. From then on, only one
command from the bus master is required to turn each individual
open drain output ON, OFF, or to cycle at BLINK RATE 1 or BLINK
RATE 2. Maximum output sink current is 25 mA per bit and 200 mA
per package.
Any bits not used for controlling the LEDs can be used for General
Purpose Parallel Input/Output (GPIO) expansion.
The active-LOW hardware reset pin (RESET) and Power-On Reset
(POR) initializes the registers to their default state, all zeroes,
causing the bits to be set HIGH (LED off).
Three hardware address pins on the PCA9552 allow eight devices
to operate on the same bus.
ORDERING INFORMATION
Standard packing quantities and other packaging data are available at www.standardproducts.philips.com/packaging.
I2C is a trademark of Philips Semiconductors Corporation.
Philips Semiconductors Product data sheet
PCA955216-bit I2 C LED driver with programmable blink rates
PIN CONFIGURATION — SO, TSSOP
Figure 1. Pin configuration — SO, TSSOP
PIN CONFIGURATION — HVQFN
Figure 2. Pin configuration — HVQFN
PIN DESCRIPTION
Philips Semiconductors Product data sheet
PCA955216-bit I2 C LED driver with programmable blink rates
BLOCK DIAGRAM
Figure 3. Block diagram
Philips Semiconductors Product data sheet
PCA955216-bit I2 C LED driver with programmable blink rates
DEVICE ADDRESSING
Following a START condition the bus master must output the
address of the slave it is accessing. The address of the PCA9552 is
shown in Figure 4. To conserve power, no internal pull-up resistors
are incorporated on the hardware selectable address pins and they
must be pulled HIGH or LOW.
Figure 4. Slave address
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 PCA9552 which will be stored
in the Control Register. This register can be read and written via the
I2C-bus.
Figure 5. Control register
The lowest 3 bits are used as a pointer to determine which register
will be accessed.
If the auto-increment flag (AI) is set, the four 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 ‘0000’ 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
‘0’ (B3 B2 B1 B0 � 0 0 0 0).
Only the 4 least significant bits are affected by the AI flag.
Unused bits must be programmed with zeroes.
Control Register definition
REGISTER DESCRIPTION
INPUT0 — INPUT REGISTER 0
The INPUT register 0 reflects the state of the device pins (inputs 0
to 7). 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.
INPUT1 — INPUT REGISTER 1
The INPUT register 1 reflects the state of the device pins (inputs 8
to 15). 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
PSC0 is used to program the period of the PWM output.
Philips Semiconductors Product data sheet
PCA955216-bit I2 C LED driver with programmable blink rates
PWM0 — PWM REGISTER 0
The PWM0 register determines the duty cycle of BLINK0. The
outputs are LOW (LED off) when the count is less than the value in
PWM0 and HIGH when it is greater. If PWM0 is programmed with
00h, then the PWM0 output is always LOW.
The duty cycle of BLINK0 is: 256– PWM0
PSC1 — FREQUENCY PRESCALER 1
PSC1 is used to program the period of PWM output.
The period of BLINK1 � (PSC1 �1)
PWM1 — PWM REGISTER 1
The PWM1 register determines the duty cycle of BLINK1. The
outputs are LOW (LED off) when the count is less than the value in
PWM1 and HIGH when it is greater. If PWM1 is programmed with
00h, then the PWM1 output is always LOW.
The duty cycle of BLINK1 is: 256– PWM1
LS0 — LED 0–3 SELECTOR
LS1 — LED 4–7 SELECTOR
LS2 — LED 8–11 SELECTOR
LS3 — LED 12–15 SELECTOR
The LSx LED select registers determine the source of the LED data.
00 = Output is set LOW (LED on)
01 = Output is set Hi-Z (LED off – default)
10 = Output blinks at PWM0 rate
11 = Output blinks at PWM1 rate
PINS USED AS GENERAL PURPOSE I/Os
LED pins not used to control LEDs can be used as general purpose
I/Os.
For use as input: Set LEDx to high-impedance (01) and then read
the pin state via the input register.
For use as output: Connect external pull-up resistor to the pin and
size it according to the DC recommended operating characteristics.
LED output pin is HIGH when the output is programmed as
high-impedance, and LOW when the output is programmed LOW
through the “LED selector” register. The output can be pulse-width
controlled when PWM0 or PWM1 are used.
POWER-ON RESET
When power is applied to VDD, an internal Power-On Reset holds
the PCA9552 in a reset condition until VDD has reached VPOR. At
this point, the reset condition is released and the PCA9552 registers
are initialized to their default states, all the outputs in the off state.
Thereafter, VDD must be lowered below 0.2 V to reset the device.
EXTERNAL RESET
A reset can be accomplished by holding the RESET pin LOW for a
minimum of tW. The PCA9552 registers and I2C state machine will
be held in their default state until the RESET input is once again
HIGH.
This input requires a pull-up resistor to VDD if no active connection is
used.
Philips Semiconductors Product data sheet
PCA955216-bit I2 C LED driver with programmable blink rates
CHARACTERISTICS OF THE I2 C-BUS
The I2 C-bus is for 2-way, 2-line communication between different ICs
or modules. The two 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.
Bit transfer
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 Figure 6).
Figure 6. Bit transfer
Start and stop conditions
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 Figure 7).
System configuration
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 Figure 8).
Figure 7. Definition of start and stop conditions
Figure 8. System configuration
Philips Semiconductors Product data sheet
PCA955216-bit I2 C LED driver with programmable blink rates
Acknowledge
The number of data bytes transferred between the start and the stop conditions from transmitter to receiver is not limited. Each byte of eight bits
is followed by one acknowledge bit. The acknowledge bit is a HIGH level put on the bus by the transmitter whereas the master generates an
extra acknowledge related clock pulse.
A slave receiver which is addressed must generate an acknowledge after the reception of each byte. Also a master must generate an
acknowledge after the reception of each byte that has been clocked out of the slave transmitter. The device that acknowledges has to pull down
the SDA line during the acknowledge clock pulse, so that the SDA line is stable LOW during the HIGH period of the acknowledge related clock
pulse, set-up and hold times must be taken into account.
A master receiver must signal an end of data to the transmitter by not generating an acknowledge on the last byte that has been clocked out of
the slave. In this event, the transmitter must leave the data line HIGH to enable the master to generate a stop condition.
Figure 9. Acknowledgement on the I2C-bus
Philips Semiconductors Product data sheet
PCA955216-bit I2 C LED driver with programmable blink rates
Bus transactions
Figure 10. WRITE to register
Figure 11. READ from register
NOTE:
Philips Semiconductors Product data sheet
PCA955216-bit I2 C LED driver with programmable blink rates
APPLICATION DATA
Figure 13. Typical application
Minimizing IDD when the I/O is used to control LEDs
When the I/Os are used to control LEDs, they are normally connected to VDD through a resistor as shown in Figure 13. Since the LED acts as a
diode, when the LED is off the I/O VIN is about 1.2 V less than VDD. The supply current, IDD, increases as VIN becomes lower than VDD and is
specified as ΔIDD in the DC characteristics table.
Designs needing to minimize current consumption, such as battery power applications, should consider maintaining the I/O pins greater than or
equal to VDD when the LED is off. Figure 14 shows a high value resistor in parallel with the LED. Figure 15 shows VDD less than the LED supply
voltage by at least 1.2 V. Both of these methods maintain the I/O VIN at or above VDD and prevents additional supply current consumption when
the LED is off.
Figure 14. High value resistor in parallel with the LED
Figure 15. Device supplied by a lower voltage
Philips Semiconductors Product data sheet
PCA955216-bit I2 C LED driver with programmable blink rates
Programming example
The following example will show how to set LED0 to LED3 on. It will
then set LED4 and LED5 to blink at 1 Hz at a 50% duty cycle. LED6
and LED7 will be set to blink at 4 Hz and at a 25% duty cycle. LED8
to LED15 will be set to off.
Table 1.

Partno	Mfg	Dc	Qty	Available	Descript
PCA9552BS	PHI	N/a	5406	avai	16-bit I2C-bus LED driver with programmable blink rates
PCA9552PW	PHILIP	N/a	268	avai	16-bit I2C LED driver with programmable blink rates