How the I2C Bus Works - EEWeb

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2 to 1 I 2 C Master Selector w/Interrupt Logic and Reset Master 0 I 2 C Bus Master 1 I 2 C Bus Interrupt 0 Out Interrupt 1 Out FEATURES - Select one of two I 2 C masters to a single channel -I 2 C/SMBus commands used to select channel - Reset or Power On Reset (POR) resets state machine - Interrupt outputs also report demultiplexer status - Sends 9 clock pulses and stop condition to clear slave card prior to transferring master I Interrupt In 2C Controller • PCA9541/01 - defaults to channel 0 on start-up/reset Slave Card I 2 C Bus Interrupt In Reset KEY POINTS - Allows primary and backup master to communicate to one downstream slave card. - Arbitration circuit between bus masters - Doesn’t isolate bus capacitance - Allows voltage translation between 1.8 V, 2.5 V, 3.3 V and 5 V - Idle detect for live insertion protection • PCA9541/02 - defaults to channel 0 on start-up/reset after stop condition • PCA9541/03 – defaults to off on start-up/reset, master commands channel Semiconductors 60
PCA9541 - Multi-Point Application Master 0 PCA9541 PCA9541 PCA9541 PCA9541 In a typical multi-point application, as shown in the diagram, the two masters (e.g., primary and back-up) are located on separate I 2 C buses that connect to multiple downstream I 2 C bus slave cards via a PCA9541 to provide high reliability of the I 2 C bus. This way one of the controller cards can fail or be removed from the system and control of the line cards is maintained. A bent pin or other hard failure is confined to one bus and control is maintained on the other bus. I 2 C commands are sent via the primary or backup master and either master at any time can gain control of the slave devices if the other master is disabled or removed from the system. The failed master is isolated from the system and will not affect communication between the on-line master and the slave devices located on the line cards. Semiconductors 61 PCA9541 PCA9541 PCA9541 PCA9541 Master 1
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Interface Products Business Line Sp
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How the I 2 C Bus Works The I 2 C (
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Multi-Master Support How the I 2 C
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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 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: I 2 C Multiplexers: Multi-card Appl
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
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Page 93 and 94: PCA9564 Demo Board Layout Semicondu
Page 95 and 96: PCA9551 LED Blinkers Win-I2CNT Inte
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Page 101: End Philips Semiconductors www.semi
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How the I2C Bus Works - EEWeb

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