How the I2C Bus Works - EEWeb

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The master always sends the SCL (clock) signal. I 2 C Bus Basics - Address and Data SCL SDA 巨con - troller Each device is addressed individually by software with a unique address that can be modified by hardware pins. The open drain/collector outputs provide for a “wired-AND” connection that allows devices to be added or removed without impact and always require a pull-up resistor. GPIO A/D D/A LCD RTC 巨controller II 1010A 2 A 1 A 0 R/W 1010100R/W Write data Master Slave S slave address address W W A Adata data A data A data A P A P transmitter Read data < n data bytes > S slave address R A data A data A P EEPROM New devices or functions can be easily ‘clipped on to an existing bus! Semiconductors 16 A 2 A 1 A 0 receiver receiver transmitter < n data bytes > last data byte S = Start condition R/W = read / write not A = Acknowledge A = Not Acknowledge P = Stop condition
I 2 C Bus Basics - Bus Operation Typical bus communication waveforms The I2C specification and other useful application information can be found on Philips Semiconductors I2C web site at www.semiconductors.philips.com/i2c Semiconductors 17
Page 1 and 2: Interface Products Business Line Sp
Page 3 and 4: How the I 2 C Bus Works The I 2 C (
Page 5 and 6: Multi-Master Support How the I 2 C
Page 7 and 8: Typical Applications • Cell phone
Page 9 and 10: C++ Complex I 2 C Bus Arrangement H
Page 11 and 12: • Well known bus: I 2 C Bus Benef
Page 13 and 14: I 2 C Manufacturer Benefits • Sim
Page 15: I 2 C Product Characteristics • P
Page 19 and 20: I2C by the numbers Standard-Mode Fa
Page 21 and 22: Device Overview Device Overview Sem
Page 23 and 24: Bus Controllers Bus Controllers Sem
Page 25 and 26: Application - Add I 2 C Bus Port µ
Page 27 and 28: Application - Add additional I 2 C
Page 29 and 30: Application - Convert 8 bits of par
Page 31 and 32: I 2 C Temperature Sensors - Industr
Page 33 and 34: APPLICATIONS • System thermal man
Page 35 and 36: Supply SDA SCL Sub address decoder
Page 37 and 38: Totem Pole Output I 2 C I/O Expande
Page 39 and 40: Totem Pole Output I 2 C I/O Expande
Page 41 and 42: 4-bit GPIO with Interrupt and Reset
Page 43 and 44: Sampling 16-bit GPIO with Interrupt
Page 45 and 46: Supply SDA SCL POR I 2 C-bus interf
Page 47 and 48: Frequency Duty Cycle PWM 0 256 PCA9
Page 49 and 50: Serial EEPROM Serial EEPROMS Semico
Page 51 and 52: 1024 X 8 CMOS Security EEPROM FEATU
Page 53 and 54: I2C C Bus I2C C INTERFACE / EEPROM
Page 55 and 56: I 2 C Bus Interrupt Out I 2 C Bus I
Page 57 and 58: I 2 C Switches: Voltage Level Shift
Page 59 and 60: I 2 C Multiplexers: Multi-card Appl
Page 61 and 62: PCA9541 - Multi-Point Application M
Page 63 and 64: PCA9541 - Gatekeeper Multiplexer
Page 65 and 66: I 2 C Multiplexers and Switches Sem
Page 67 and 68:
I 2 C Bus repeater (PCA9515) and Hu
Page 69 and 70:
Level Translation I 2 C Bus Buffer
Page 71 and 72:
I 2 C Hot Swap Bus Buffer PCA9510/1
Page 73 and 74:
CompactPCI, AdvancedTCA and VME use
Page 75 and 76:
Normal I 2 C P82B715 I 2 C Bus Exte
Page 77 and 78:
3.3/5V SCL 3.3/5 SDA Changing I 2 C
Page 79 and 80:
Changing I 2 C bus signals for Opto
Page 81 and 82:
Segment Drivers Segment Drivers Sem
Page 83 and 84:
A/D Converter A/D Converters Semico
Page 85 and 86:
Roadmap Roadmap Semiconductors 85
Page 87 and 88:
PCA9504A Other LED Driver and Blink
Page 89 and 90:
MLP/HVQFN New Heat Sink Very Thin Q
Page 91 and 92:
Combined I 2 C and UART Demo Board
Page 93 and 94:
PCA9564 Demo Board Layout Semicondu
Page 95 and 96:
PCA9551 LED Blinkers Win-I2CNT Inte
Page 97 and 98:
I 2 C Device Data Sheets, IBIS mode
Page 99 and 100:
I 2 C Sample Kit The I 2 C Sample K
Page 101:
End Philips Semiconductors www.semi
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How the I2C Bus Works - EEWeb

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