How the I2C Bus Works - EEWeb

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LED Blinkers LED Blinkers Semiconductors 44
Supply SDA SCL POR I 2 C-bus interface Sub address decoder I 2 C LED Dimmers/Blinkers Oscillator Reset 巨 # of Outputs Reset and POR Input/ output stages alternative analog input configurations 2 PCA9530/50 4 PCA9533/53 8 PCA9531/51 16 PCA9532/52 Application Note AN264 KEY POINTS -I 2 C/SMBus is not tied up by sending repeated transmissions to turn LEDs on and then off to “blink” LEDs. - Frees up the micro’s timer - Continues to blink LEDs even when no longer connected to bus master - Can be used to cycle relays and timers - Higher frequency rate allows LEDs to be dimmed by varying the duty cycle for Red/Green/Blue color mixing applications. FEATURES - 25 mA open drain outputs - Internal oscillator (+/- 15%) - Two user definable blink rates and duty cycles adjustable between 160 Hz and 1.6 seconds (3x Dimmers) or 40 Hz and 6.4 seconds (5x Blinkers) in 256 steps - Unused pins can be used for normal GPIO - Hardware Reset pin and Power On Reset (POR) Semiconductors 45
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 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: Sampling 16-bit GPIO with Interrupt
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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