INTEGRATED CIRCUITS DATA SHEET PCF8574 Remote 8-bit I/O expander for I2C-bus Product specification Supersedes data of 2002 Jul 29 2002 Nov 22
Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus CONTENTS 1 FEATURES 2 GENERAL DESCRIPTION 3 ORDERING INFORMATION 4 BLOCK DIAGRAM 5 PINNING 5.1 5.2 DIP16 and SO16 packages SSOP20 package 6 CHARACTERISTICS OF THE I2C-BUS 6.1 6.2 6.3 6.4 Bit transfer Start and stop conditions System configuration Acknowledge 7 FUNCTIONAL DESCRIPTION 7.1 7.2 7.
Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus 1 PCF8574 FEATURES • Operating supply voltage 2.5 to 6 V • Low standby current consumption of 10 µA maximum • I2C-bus to parallel port expander • Open-drain interrupt output The device consists of an 8-bit quasi-bidirectional port and an I2C-bus interface. The PCF8574 has a low current consumption and includes latched outputs with high current drive capability for directly driving LEDs.
Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus 4 PCF8574 BLOCK DIAGRAM handbook, full pagewidth INT 13 INTERRUPT LOGIC PCF8574 1 A0 A1 A2 SCL SDA LP FILTER 2 4 3 5 6 14 15 INPUT FILTER I 2 C BUS CONTROL 7 SHIFT REGISTER 8 BIT I/O PORT 9 10 11 12 WRITE pulse VDD V SS 16 8 READ pulse POWER-ON RESET MBD980 Fig.1 Block diagram (pin numbers apply to DIP16 and SO16 packages).
Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus 5 PCF8574 PINNING 5.
Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus 5.2 PCF8574 SSOP20 package SYMBOL PIN DESCRIPTION INT 1 interrupt output (active LOW) SCL 2 serial clock line n.c. 3 not connected SDA 4 serial data line VDD 5 supply voltage A0 6 address input 0 A1 7 address input 1 n.c. 8 not connected A2 9 address input 2 P0 10 quasi-bidirectional I/O 0 P1 11 quasi-bidirectional I/O 1 P2 12 quasi-bidirectional I/O 2 n.c.
Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus 6 PCF8574 6.2 CHARACTERISTICS OF THE I2C-BUS 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 Fig.6). The I2C-bus is for 2-way, 2-line communication between different ICs or modules.
Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus 6.4 Acknowledge PCF8574 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.
Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus 7 PCF8574 FUNCTIONAL DESCRIPTION VDD handbook, full pagewidth write pulse 100 µA data from shift register D Q FF P0 to P7 CI S power-on reset V SS D Q FF CI read pulse S to interrupt logic data to shift register MBD977 Fig.9 Simplified schematic diagram of each I/O. 7.1 Addressing For addressing see Figs 10, 11 and 12.
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Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus 7.2 PCF8574 • Interrupts which occur during the acknowledge clock pulse may be lost (or very short) due to the resetting of the interrupt during this pulse. Interrupt output The PCF8574 provides an open-drain output (INT) which can be fed to a corresponding input of the microcontroller (see Figs 13 and 14). This gives these chips a type of master function which can initiate an action elsewhere in the system.
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Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus PCF8574 8 LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 60134). SYMBOL PARAMETER MIN. MAX. UNIT VDD supply voltage −0.5 +7.0 V VI input voltage VSS − 0.5 VDD + 0.
Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus SYMBOL PARAMETER PCF8574 CONDITIONS MIN. TYP. MAX. UNIT I/Os VIL LOW level input voltage −0.5 − +0.3VDD V VIH HIGH level input voltage 0.7VDD − VDD + 0.
Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus PCF8574 11 I2C-BUS TIMING CHARACTERISTICS SYMBOL PARAMETER MIN. TYP. MAX. UNIT I2C-bus timing (see Fig.16; note 1) fSCL SCL clock frequency − − 100 kHz tSW tolerable spike width on bus − − 100 ns tBUF bus free time 4.7 − − µs tSU;STA START condition set-up time 4.7 − − µs tHD;STA START condition hold time 4.0 − − µs tLOW SCL LOW time 4.7 − − µs tHIGH SCL HIGH time 4.
Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus PCF8574 12 PACKAGE OUTLINES DIP16: plastic dual in-line package; 16 leads (300 mil) SOT38-4 ME seating plane D A2 A A1 L c e Z w M b1 (e 1) b b2 MH 9 16 pin 1 index E 1 8 0 5 10 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 min. A2 max. b b1 b2 c D (1) E (1) e e1 L ME MH w Z (1) max. mm 4.2 0.51 3.2 1.73 1.30 0.53 0.38 1.
Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus PCF8574 SO16: plastic small outline package; 16 leads; body width 7.5 mm SOT162-1 D E A X c HE y v M A Z 9 16 Q A2 A (A 3) A1 pin 1 index θ Lp L 1 8 e detail X w M bp 0 5 10 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (1) e HE L Lp Q v w y mm 2.65 0.30 0.10 2.45 2.25 0.25 0.49 0.36 0.32 0.23 10.5 10.1 7.
Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus PCF8574 SSOP20: plastic shrink small outline package; 20 leads; body width 4.4 mm D SOT266-1 E A X c y HE v M A Z 11 20 Q A2 A (A 3) A1 pin 1 index θ Lp L 1 10 detail X w M bp e 0 2.5 5 mm scale DIMENSIONS (mm are the original dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (1) e HE L Lp Q v w y Z (1) θ mm 1.5 0.15 0 1.4 1.2 0.25 0.32 0.20 0.20 0.13 6.6 6.4 4.5 4.3 0.
Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus Typical reflow peak temperatures range from 215 to 250 °C. The top-surface temperature of the packages should preferable be kept below 220 °C for thick/large packages, and below 235 °C for small/thin packages. 13 SOLDERING 13.1 Introduction This text gives a very brief insight to a complex technology.
Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus 13.
Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus PCF8574 14 DATA SHEET STATUS LEVEL DATA SHEET STATUS(1) PRODUCT STATUS(2)(3) Development DEFINITION I Objective data II Preliminary data Qualification This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date.
Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus PCF8574 17 PURCHASE OF PHILIPS I2C COMPONENTS 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 specification defined by Philips. This specification can be ordered using the code 9398 393 40011.
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