How the I2C Bus Works - EEWeb

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Main Master PCA9541 – Shared Resources PCA9541 Slave A0 PCA9541 Slave B0 Assembly A Slave A1 Slave A2 Assembly B SDA/SCL SDA/SCL Slave B1 Slave B2 Master A Master B Some masters may not be multi-master capable or some masters may not work well together and continually lock up the bus. The PCA9541 can be used to separate the masters, but still allow shared access to slave devices, such as Field Replaceable Unit (FRU) EEPROMs or temperature sensors such as is represented by Slave A0 and Slave B0. Semiconductors 62
PCA9541 – Gatekeeper Multiplexer • The PCA9541/03 acts as the gatekeeper to each card that have identically I 2 C addressed EEPROMs. The master turns each uniquely addressed PCA9541/03 on (master 0) and off, one at a time, to communicate with the EEPROMs. Master 0 PCA9548 PCA9541 EEPROM PCA9541 EEPROM PCA9541 EEPROM PCA9541 A B C D E F G H EEPROM Z Z Z Z Z Z Z Z • The alternative is to use a PCA9548 to 1 to 8 multiplexer on the master card and then run 8 I2C buses, one to each EEPROM card. You use the same number of card pins but have 8 times the number of traces on the backplane. Semiconductors 63 PCA9541 EEPROM PCA9541 EEPROM PCA9541 EEPROM PCA9541 EEPROM
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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
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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 and 60: I 2 C Multiplexers: Multi-card Appl
Page 61: PCA9541 - Multi-Point Application M
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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