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PCA9553 4-bit I2C LED driver with programmable blink rates
Product data Supersedes data of 2002 Dec 13 2003 May 02
Philips Semiconductors
Philips Semiconductors
Product data
4-bit I2C LED driver with programmable blink rates
PCA9553
the I2C-bus and uses up one of the master's timers. The PCA9553 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). 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 100 mA per package. Any bits not used for controlling the LEDs can be used for General Purpose Parallel Input/Output (GPIO) expansion.
FEATURES
Power On Reset (POR) initializes the registers to their default state, all zeroes, causing the bits to be set HIGH (LED off). Due to pin limitations, the PCA9553 is not featured with hardware address pins. The PCA9553/01 and the PCA9553/02 have different fixed I2C-bus addresses allowing operation of both on the same bus.
* 4 LED drivers (on, off, flashing at a programmable rate) * 2 selectable, fully programmable blink rates (frequency and duty
cycle) between 0.15625 and 40 Hz (6.4 and 0.025 seconds)
* Input/outputs not used as LED drivers can be used as regular
GPIOs
PIN CONFIGURATION
* Internal oscillator requires no external components * I2C-businterface logic compatible with SMBus * Internal power-on reset * Noise filter on SCL/SDA inputs * 4 open drain outputs directly drive LEDs to 25 mA * Controlled edge rates to minimize ground bounce * 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
LED0 LED1 LED2 VSS
1 2 3 4
8 7 6 5
VDD SDA SCL LED3
SW01035
Figure 1. Pin configuration
PIN DESCRIPTION
PIN NUMBER 1 2 3 4 5 6 7 8 SYMBOL LED0 LED1 LED2 VSS LED3 SCL SDA VDD FUNCTION LED driver 0 LED driver 1 LED driver 2 Supply ground LED driver 3 Serial clock line Serial data line Supply voltage
* Latch-up testing is done to JEDEC Standard JESD78 which
exceeds 100 mA
* Packages offered: SO8, TSSOP8
DESCRIPTION
The PCA9553 LED Blinker blinks LEDs in I@C and SMBus applications where it is necessary to limit bus traffic or free up the I2C 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
ORDERING INFORMATION
PACKAGES 8-Pin Plastic SO 8-Pin Plastic SO 8-Pin Plastic TSSOP TEMPERATURE RANGE -40 to +85 C -40 to +85 C -40 to +85 C ORDER CODE PCA9553D/01 PCA9553D/02 PCA9553DP/01 TOPSIDE MARK P9553/1 P9553/2 P53/1 DRAWING NUMBER SOT96-1 SOT96-1 SOT505-1 SOT505-1
8-Pin Plastic TSSOP -40 to +85 C PCA9553DP/02 P53/2 Standard packing quantities and other packaging data is available at www.philipslogic.com/packaging. I2C is a trademark of Philips Semiconductors Corporation.
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Philips Semiconductors
Product data
4-bit I2C LED driver with programmable blink rates
PCA9553
BLOCK DIAGRAM
PCA9553
INPUT REGISTER
SCL INPUT FILTERS SDA
I2C-BUS CONTROL
LED SELECT (LSx) REGISTER
0 1 LEDx VDD POWER-ON RESET PRESCALER 0 REGISTER PRESCALER 1 REGISTER PWM0 REGISTER PWM1 REGISTER BLINK0
OSCILLATOR
BLINK1
VSS NOTE: ONLY ONE I/O SHOWN FOR CLARITY
SW01036
Figure 2. Block diagram
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Philips Semiconductors
Product data
4-bit I2C LED driver with programmable blink rates
PCA9553
DEVICE ADDRESSING
Following a START condition the bus master must output the address of the slave it is accessing. The address of the PCA9553/01 is shown in Figure 3 and PCA9553/02 in Figure 4.
SLAVE ADDRESS
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 `0' (B2 B1 B0 0 0 0 0) Only the 3 least significant bits are affected by the AI flag.
1
1
0
0
0
1
0
R/W
Unused bits must be programmed with zeroes. INPUT -- INPUT REGISTER
SW01037
bit Default
7 X
6 X
5 X
4 X
3 X
2 X
1 X
0 X
Figure 3. Slave address -- PCA9553/01
SLAVE ADDRESS
The INPUT register reflects the state of the device pins. Writes to this register will be acknowledged but will have no effect. PSC0 -- FREQUENCY PRESCALER 0 bit default
SW01038
1
1
0
0
0
1
1
R/W
7 1
6 1
5 1
4 1
3 1
2 1
1 1
0 1
PSC0 is used to program the period of the PWM output. Figure 4. Slave address -- PCA9553/02 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. (PSC0 ) 1) 44 PWM0 -- PWM REGISTER 0 The period of BLINK0 + bit default 7 1 6 0 5 0 4 0 3 0 2 0 1 0 0 0
CONTROL REGISTER
Following the successful acknowledgement of the slave address, the bus master will send a byte to the PCA9553 which will be stored in the Control Register.
0 0 0 AI 0 B2 B1 B0
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 256 PSC1 -- FREQUENCY PRESCALER 1 bit 7 1 6 1 5 1 4 1 3 1 2 1 1 1 0 1 default
REGISTER ADDRESS RESET STATE: 00h AUTO-INCREMENT FLAG SW01034
PSC1 is used to program the period of PWM output. (PSC1 ) 1) 44 PWM1 -- PWM REGISTER 1 The period of BLINK1 + bit default 7 1 6 0 5 0 4 0 3 0 2 0 1 0 0 0
Figure 5. Control register
CONTROL REGISTER DEFINITION
B2 0 0 0 0 1 1 B1 0 0 1 1 0 0 B0 0 1 0 1 0 1 REGISTER NAME INPUT PSC0 PWM0 PSC1 PWM1 LS0 TYPE READ 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
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 256 LS0 -- LED SELECTOR LED3 bit default 7 0 6 1 5 0 LED2 4 1 LED 1 3 0 2 1 LED 0 1 0 0 1
REGISTER DESCRIPTION
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 2003 May 02 4
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
Philips Semiconductors
Product data
4-bit I2C LED driver with programmable blink rates
PCA9553
POWER-ON RESET
When power is applied to VDD, an internal Power-On Reset holds the PCA9553 in a reset state until VDD has reached VPOR. At this point, the reset condition is released and the PCA9553 registers are initialized to their default states, with all outputs in the off state.
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).
CHARACTERISTICS OF THE I2C-BUS
The I2C-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.
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).
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).
SDA
SCL data line stable; data valid change of data allowed SW00363
Figure 6. Bit transfer
SDA
SDA
SCL S START condition P STOP condition
SCL
SW00365
Figure 7. Definition of start and stop conditions
SDA SCL
MASTER TRANSMITTER/ RECEIVER
SLAVE RECEIVER
SLAVE TRANSMITTER/ RECEIVER
MASTER TRANSMITTER
MASTER TRANSMITTER/ RECEIVER
I2C MULTIPLEXER
SLAVE SW00366
Figure 8. System configuration
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Philips Semiconductors
Product data
4-bit I2C LED driver with programmable blink rates
PCA9553
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.
DATA OUTPUT BY TRANSMITTER not acknowledge DATA OUTPUT BY RECEIVER acknowledge SCL FROM MASTER S START condition 1 2 8 9 clock pulse for acknowledgement SW00368
Figure 9. Acknowledgement on the
I2C-bus
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Philips Semiconductors
Product data
4-bit I2C LED driver with programmable blink rates
PCA9553
Bus transactions
SCL 1 2 3 4 5 6 7 8 9 command byte data to register
slave address
SDA
S
1
1
0
0
0
1
0
0 R/W
A
0
0
0
AI
0
B2
B1
B0
A acknowledge from slave
DATA 1
A acknowledge from slave
start condition
acknowledge from slave
WRITE TO REGISTER
DATA OUT FROM PORT tpv
DATA 1 VALID
SW02002
Figure 10. WRITE to register
slave address
acknowledge from slave
acknowledge from slave
slave address
acknowledge from slave
data from register
acknowledge from master
S
1
1
0
0
0
1
0
0 R/W
A
0
0
0
AI
0
B2 B1 B0
A
S
1
1
0
0
0
1
0
1 R/W
A
DATA first byte
A
at this moment master-transmitter becomes master-receiver and slave-receiver becomes slave-transmitter data from register
auto-increment register address if AI = 1
no acknowledge from master
DATA last byte
NA
P
SW02001
Figure 11. READ from register
slave address data from port data from port
SDA
S
1
1
0
0
0
1
0
1 R/W
A acknowledge from slave
DATA 1
A acknowledge from master
DATA 4
NA
P stop condition
start condition
no acknowledge from master
READ FROM PORT
DATA INTO PORT
DATA 1 tph
DATA 2
DATA 3 tps
DATA 4
SW01097
NOTES: 1. This figure assumes the command byte has previously been programmed with 00h. 2. PCA9553/01 shown. Figure 12. READ input port register
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Philips Semiconductors
Product data
4-bit I2C LED driver with programmable blink rates
PCA9553
APPLICATION DATA
5V
5V
VDD SDA SCL SDA SCL LED0 LED1 LED2 LED3
I2C/SMBus MASTER
VSS
PCA9553
SW01039
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 IDD 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.
VDD
3.3 V
5V
LED VDD
100 k VDD LED
LEDx
LEDx
SW02086
SW02087
Figure 14. High value resistor in parallel with the LED
Figure 15. Device supplied by a lower voltage
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Philips Semiconductors
Product data
4-bit I2C LED driver with programmable blink rates
PCA9553
Programming example
The following example will show how to set LED0 and LED1 off. It will then set LED2 to blink at 1 Hz, 50% duty cycle. LED3 will be set to blink at 4 Hz, 25% duty cycle. PCA9553/01 is used in this example.
Table 1.
I2C-bus Start PCA9553 address PSC0 subaddress + auto-increment Set prescaler PSC0 to achieve a period of 1 second: Blink period + 1 + PSC0 ) 1 44 PSC0 = 37 Set PWM0 duty cycle to 50%: 256 - PWM0 + 0.5 256 PWM0 = 128 Set prescaler PWM1 to achieve a period of 0.25 seconds: Blink period + 0.25 + PSC1 ) 1 44 PSC1 = 9 Set PWM1 output duty cycle to 25%: 256 - PWM1 + 0.25 256 PWM1 = 192 Set LED0 on, LED1 off, LED2 set to blink at PSC0, PWM0, LED3 set to blink at PCS1, PWM1 Stop 09h S C4h 11h 25h
80h
C0h
E4h P
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Philips Semiconductors
Product data
4-bit I2C LED driver with programmable blink rates
PCA9553
ABSOLUTE MAXIMUM RATINGS
In accordance with the Absolute Maximum Rating System (IEC 134) SYMBOL VDD VI/O II/O ISS Ptot Tstg Tamb Supply voltage DC voltage on an I/O DC output current on an I/O Supply current Total power dissipation Storage temperature range Operating ambient temperature PARAMETER CONDITIONS MIN -0.5 VSS - 0.5 -- -- -- -65 -40 MAX 6.0 5.5 25 100 400 +150 +85 UNIT V V mA mA mW C C
HANDLING
Inputs and outputs are protected against electrostatic discharge in normal handling. However, to be totally safe, it is desirable to take precautions appropriate to handling MOS devices. Advice can be found in Data Handbook IC24 under "Handling MOS devices".
DC CHARACTERISTICS
VDD = 2.3 to 5.5 V; VSS = 0 V; Tamb = -40 to +85 C; unless otherwise specified. TYP at 3.3 V and 25 C. SYMBOL Supplies VDD IDD Istb IDD VPOR VIL VIH IOL IL CI I/Os VIL VIH LOW-level input voltage HIGH-level input voltage VOL = 0.4 V; VDD = 2.3 V; Note 1 VOL = 0.4 V; VDD = 3.0 V; Note 1 IOL LOW-level output current VOL = 0.4 V; VDD = 4.5 V; Note 1 VOL = 0.7 V; VDD = 2.3 V; Note 1 VOL = 0.7 V; VDD = 3.0 V; Note 1 VOL = 0.7 V; VDD = 4.5 V; Note 1 IL CIO Input leakage current Input/output capacitance VDD = 3.6 V; VI = 0 or VDD -0.5 2.0 9 12 15 15 20 25 -1 -- -- -- -- -- -- -- -- -- -- 2.1 0.8 5.5 -- -- -- -- -- -- 1 5 V V mA mA mA mA mA mA A pF Supply voltage Supply current Standby current Additional standby current Power-on reset voltage Operating mode; VDD = 5.5 V; no load; VI = VDD or VSS; fSCL = 100 kHz Standby mode; VDD = 5.5 V; no load; VI = VDD or VSS; fSCL = 100 kHz Standby mode; VDD = 5.5 V; Every LED I/O at VIN = 4.3 V; fSCL = 0 kHz No load; VI = VDD or VSS 2.3 -- -- -- -- -- 350 1.9 -- 1.7 5.5 500 3.0 325 2.2 V A A A V PARAMETER CONDITIONS MIN TYP MAX UNIT
Input SCL; input/output SDA LOW-level input voltage HIGH-level input voltage LOW-level output current Leakage current Input capacitance VOL = 0.4V VI = VDD = VSS VI = VSS -0.5 0.7 VDD 3 -1 -- -- -- 6.5 -- 3.7 0.3 VDD 5.5 -- +1 5 V V mA A pF
NOTES: 1. Each I/O must be externally limited to a maximum of 25 mA and the device must be limited to a maximum current of 100 mA.
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Philips Semiconductors
Product data
4-bit I2C LED driver with programmable blink rates
PCA9553
AC SPECIFICATIONS
SYMBOL fSCL tBUF tHD;STA tSU;STA tSU;STO tHD;DAT tVD;ACK tVD;DAT (L) tVD;DAT (H) tSU;DAT tLOW tHIGH tF tR tSP Port Timing tPV tPS tPH Output data valid Input data set-up time Input data hold time -- 100 1 200 -- -- -- 100 1 200 -- -- ns ns s PARAMETER Operating frequency Bus free time between STOP and START conditions Hold time after (repeated) START condition Repeated START condition set-up time Set-up time for STOP condition Data in hold time Valid time for ACK condition2 Data out valid time3 Data out valid time3 Data set-up time Clock LOW period Clock HIGH period Clock/Data fall time Clock/Data rise time Pulse width of spikes that must be suppressed by the input filters STANDARD MODE I2C BUS MIN 0 4.7 4.0 4.7 4.0 0 -- -- -- 250 4.7 4.0 -- -- -- MAX 100 -- -- -- -- -- 600 600 1500 -- -- -- 300 1000 50 FAST MODE I2C BUS MIN 0 1.3 0.6 0.6 0.6 0 -- -- -- 100 1.3 0.6 20 + 0.1 Cb --
1
UNITS kHz s s s s ns ns ns ns ns s s ns ns ns
MAX 400 -- -- -- -- -- 600 600 600 -- -- -- 300 300 50
20 + 0.1 Cb1
NOTES: 1. Cb = total capacitance of one bus line in pF. 2. tVD;ACK = time for Acknowledgement signal from SCL LOW to SDA (out) LOW. 3. tVD;DAT = minimum time for SDA data out to be valid following SCL LOW.
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Philips Semiconductors
Product data
4-bit I2C LED driver with programmable blink rates
PCA9553
+20% MAX +10%
0% PERCENT VARIATION AVG -10%
-20%
-30%
MIN -40% -40 0 +25 TEMPERATURE (C) +70 +85 SW01085
Figure 16. Typical frequency variation over process at VDD = 2.3 V to 3.0 V
+20% MAX +10%
0% PERCENT VARIATION AVG -10%
-20% MIN -30%
-40% -40 0 +25 TEMPERATURE (C) +70 +85 SW01086
Figure 17. Typical frequency variation over process at VDD = 3.0 V to 5.5 V
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Philips Semiconductors
Product data
4-bit I2C LED driver with programmable blink rates
PCA9553
SDA
tBUF
tLOW
tR
tF
tHD;STA
tSP
SCL
tHD;STA P S tHD;DAT tHIGH tSU;DAT Sr
tSU;STA
tSU;STO P
SU00645
Figure 18. Definition of timing
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Philips Semiconductors
Product data
4-bit I2C LED driver with programmable blink rates
PCA9553
SO8: plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1
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Philips Semiconductors
Product data
4-bit I2C LED driver with programmable blink rates
PCA9553
TSSOP8: plastic thin shrink small outline package; 8 leads; body width 3 mm
SOT505-1
2003 May 02
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Philips Semiconductors
Product data
4-bit I2C LED driver with programmable blink rates
PCA9553
REVISION HISTORY Rev Date _2 20030502
Description Product data (9397 750 11464); ECN 853-2397 29856 Dated 24 April2003. Supersedes data of 2002 Dec 13 (9397 750 10859). Modifications: * Correction to voltage in typical application drawing
* Update maximum current per bit and per device * Adjust maximum and minimum curves to 15% on frequency variation graphs.
_1 20021213 Product data (9397 750 10859); ECN 853-2397 29264 of 09 December 2002.
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Philips Semiconductors
Product data
4-bit I2C LED driver with programmable blink rates
PCA9553
Purchase of Philips I2C components conveys a license under the Philips' I2C patent to use the components in the I2C system provided the system conforms to the I2C specifications defined by Philips. This specification can be ordered using the code 9398 393 40011.
Data sheet status
Level
I
Data sheet status[1]
Objective data
Product status[2] [3]
Development
Definitions
This data sheet contains data from the objective specification for product development. Philips Semiconductors reserves the right to change the specification in any manner without notice. This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date. Philips Semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. This data sheet contains data from the product specification. Philips Semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. Relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN).
II
Preliminary data
Qualification
III
Product data
Production
[1] Please consult the most recently issued data sheet before initiating or completing a design. [2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com. [3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support -- These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes in the products--including circuits, standard cells, and/or software--described or contained herein in order to improve design and/or performance. When the product is in full production (status `Production'), relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified.
Contact information
For additional information please visit http://www.semiconductors.philips.com. Fax: +31 40 27 24825
Koninklijke Philips Electronics N.V. 2003 All rights reserved. Printed in U.S.A. Date of release: 05-03
For sales offices addresses send e-mail to: sales.addresses@www.semiconductors.philips.com.
Document order number:
9397 750 11464
Philips Semiconductors
2003 May 02 17

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