PCA9550 Philips Semiconductors, PCA9550 Datasheet
PCA9550
Available stocks
Related parts for PCA9550
PCA9550 Summary of contents
Page 1
... PCA9550 2 2-bit I C LED driver with programmable blink rates Product data Supersedes data of 2002 Dec 13 Philips Semiconductors INTEGRATED CIRCUITS 2003 May 02 ...
Page 2
... LED on and off. This greatly increases the amount of traffic on 2 the I C-bus and uses up one of the master’s timers. The PCA9550 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 cycle at BLINK RATE 1 or BLINK RATE 2 ...
Page 3
... SDA POWER- RESET RESET OSCILLATOR V SS 2003 May 02 A0 PWM0 PRESCALER 0 REGISTER REGISTER PWM1 PRESCALER 1 REGISTER REGISTER NOTE: ONLY ONE I/O SHOWN FOR CLARITY Figure 2. Block diagram 3 Product data PCA9550 INPUT REGISTER LED SELECT (LSx) REGISTER 0 1 LEDx BLINK0 BLINK1 SW00927 ...
Page 4
... 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 PCA9550 which will be stored in the Control Register ...
Page 5
... DD the PCA9550 in a reset state until V has reached V DD point, the reset condition is released and the PCA9550 registers are initialized to their default states, all the outputs in the off state. EXTERNAL RESET A reset can be accomplished by holding the RESET pin LOW for a minimum of t ...
Page 6
... In this event, the transmitter must leave the data line HIGH to enable the master to generate a stop condition. DATA OUTPUT BY TRANSMITTER DATA OUTPUT BY RECEIVER SCL FROM MASTER S START condition 2003 May 02 not acknowledge acknowledge Figure 8. Acknowledgement on the I C-bus 6 Product data PCA9550 9 clock pulse for acknowledgement SW00368 ...
Page 7
... Figure 10. READ from register data from port 0 A0 DATA R/W acknowledge from slave DATA 2 DATA Figure 11. READ input port register 7 Product data PCA9550 data to register DATA acknowledge acknowledge from slave from slave DATA 1 VALID t pv SW01014 acknowledge acknowledge from slave from master ...
Page 8
... The supply current above V and prevents additional supply current consumption when 100 kΩ SW02086 Figure 14. Device supplied by a lower voltage 8 Product data PCA9550 5 V LED0 LED1 SW00929 , increases as V becomes lower than less than the LED supply DD 3.3 V ...
Page 9
... The following example will show how to set LED0 to blink 50% duty cycle. LED1 will be set to blink at 4 Hz, 25% duty cycle. Table 1. Start PCA9550 address with A0 = LOW PSC0 subaddress + auto-increment Set prescaler PSC0 to achieve a period of 1 second: Blink period + 1 + PSC0 ) 1 ...
Page 10
... 0 2.3 V; Note 0 3.0 V; Note 0 5.0 V; Note 3 Product data PCA9550 MIN MAX UNIT -0.5 6 0.5 5 ±25 — mA — — 400 mW °C -65 +150 °C -40 +85 MIN TYP MAX UNIT 2 ...
Page 11
... RC time constant of the SDA bus. RESET 11 Product data PCA9550 FAST MODE 2 I C-BUS UNITS UNITS MAX MIN MAX 100 0 400 kHz µs — 1.3 — µs — 0.6 — ...
Page 12
... Figure 15. Typical frequency variation over process at V MAX AVG MIN -40 Figure 16. Typical frequency variation over process at V 2003 May 02 0 +25 +70 TEMPERATURE (° +25 +70 TEMPERATURE (° Product data PCA9550 +20% +10% 0% PERCENT VARIATION -10% -20% -30% -40% +85 SW01085 +20% +10% 0% PERCENT VARIATION -10% -20% -30% -40% +85 SW01086 ...
Page 13
... SDA t t BUF LOW SCL t HD;STA P S 2003 May 02 Figure 17. Definition of RESET timing HD;DAT HIGH SU;DAT Sr Figure 18. Definition of timing 13 Product data PCA9550 ACK OR READ CYCLE t REC 50% 50 REC 50% LED OFF SW01087 t t HD;STA SU;STA SU;STO P SU00645 ...
Page 14
... Philips Semiconductors 2 2-bit I C LED driver with programmable blink rates SO8: plastic small outline package; 8 leads; body width 3.9 mm 2003 May 02 14 Product data PCA9550 SOT96-1 ...
Page 15
... Philips Semiconductors 2 2-bit I C LED driver with programmable blink rates TSSOP8: plastic thin shrink small outline package; 8 leads; body width 3 mm 2003 May 02 15 Product data PCA9550 SOT505-1 ...
Page 16
... Product data (9397 750 10857); ECN 853-2396 29264 of 09 December 2002. 2003 May 02 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. 16 Product data PCA9550 ...
Page 17
... Relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). Fax: + 24825 Document order number: 17 Product data PCA9550 2 C patent Koninklijke Philips Electronics N.V. 2003 All rights reserved. Printed in U.S.A. Date of release: 05-03 ...