How the I2C Bus Works - EEWeb

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Bus Controller vs Bit-banging Hardware I 2 C Disadvantages: additional cost Advantages: frees up the micro to perform other tasks, multi-master capability, glitch filters, bus error detection and recovery, can easily be added to most microcontrollers, simple code (code for a hardware I 2 C is relatively simple to write (to write a byte, just load the I2CDAT register with a byte and the hardware does the rest) but you may need to take into consideration all the different error conditions (such as lost arbitration, etc)) Bit-banging Disadvantages: ties up the micro during the transmission and very difficult to use in a multi-master environment Advantages: inexpensive, can be incorporated into any micro and very little code required (code required for bit-banging an 80C51 micro is only about 50 bytes) Semiconductors 26
Application – Add additional I 2 C Bus Ports SDA SCL µcontroller, µprocessor Control signals or ASIC 8-bits PCA9564 SDA SCL • The PCA9564 can be used to convert 8-bit parallel data into additional multiple master capable I 2 C port for microcontrollers, microprocessors, custom ASICs, DSPs, etc.., that already have an I 2 C port but need one or more additional I 2 C ports to interface with more I 2 C or SMBus components or components that cannot be located on the same bus (e.g., 100 kHz and 400 kHz slaves). Semiconductors 27
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 and 16: I 2 C Product Characteristics • P
Page 17 and 18: I 2 C Bus Basics - Bus Operation Ty
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: Application - Add I 2 C Bus Port µ
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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