How the I2C Bus Works - EEWeb

More documents

Recommendations

Info

Quasi Output I 2 C I/O Expanders - Registers • To program the outputs S Address W A • To read input values S Address R A • Important to know OUTPUT DATA INPUT DATA A P A P Multiple writes are possible during the same communication Multiple reads are possible during the same communication – At power-up, all the I/O’s are HIGH (except PCF8575C); Only a current source to V DD is active – Upper transistor is on for one clock cycle to provide strong pull-up and allow for faster rising edge rate – I/O’s should be HIGH before using them as inputs Semiconductors 36
Totem Pole Output I 2 C I/O Expanders Supply SDA SCL General Purpose I/O POR I 2 C-bus interface Sub address decoder Latches Interrupt 巨 Input/ output stages alternative analog input configurations # of Outputs None Reset Interrupt KEY POINTS - Transfers keyboard, ACPI Power switch, keypad, switch or other inputs to microcontroller via I 2 C bus - Use totem pole outputs to drive LEDs, sensors, fans, enable and other input pins, relays and timers - Extra command byte needed for Input, Output, Polarity and I/O Configuration - Application Note, AN469 GPIO Selection, discusses pros and cons of GPIOs Interrupt and Reset 4 Totem Output (20-25 ma sink and 10 mA source) PCA9536 PCA9537 8 PCA9557 PCA9534/54/54A PCA9538 16 - - PCA9535/55 PCA9539 Semiconductors 37
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: Supply SDA SCL Sub address decoder
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
show all

How the I2C Bus Works - EEWeb

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?