Monthly Archives: September 2017

4-bit multiplexed/1-bit latched 5-bit I²C EEPROM DIP switch

PCA8550 Block Diagram

PCA8550 Block Diagram

PCA8550 IC is a 4-bit multiplexed/1-bit latched 5-bit I2C EEPROM DIP switch with 5-bit internal non-volatile register. The primary function of the 4-bit 2-to-1 I2C multiplexer is to select either a 4-bit input or data from a non-volatile register and drive this value onto the output pins. One additional non-multiplexed register output is also provided. The non-multiplexed output is latched to prevent output value changes during I2C writes to the non-volatile register. A write protect “override” input feature forces all outputs to logic 0.

Why Used

  • Internal non-volatile register write/readable via I2C-bus
  • Write-protect pin enables/disables I2C writes to register
  • 4-bit 2-to-1 multiplexer, 1-bit latch DIP switch
  • 5-bit internal non-volatile register
  • Override input forces all outputs to logic 0

Where Used

  • PC Motherboards
  • Pentium Pro/Pentium II Systems

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PCA9564 Parallel bus to I2C-bus controller

PCA9564 Parallel bus to I2C-bus controller Block Diagram

PCA9564 Parallel bus to I2C-bus controller Block Diagram

A PCA9564 IC is similar to the PCF8584 but operates at lower voltages and higher I2C frequencies. It is designed in CMOS technology and enhancements requested by engineers have also been incorporated. The PCA9564 IC serves as an interface between most standard parallel-bus microcontrollers/microprocessor and the serial I2C-bus and allows the parallel bus system to communicate bi-directionally with the I2C-bus. It controls all the I2C0bus specific sequences, protocol, arbitration and timing with no external timing element required.

Why Used

  • Both master and slave functions
  • Parallel-bus to I²C-bus protocol converter and interface
  • Multi-master capability
  • Internal oscillator reduces external components
  • Operating supply voltage 2.3 V to 3.6 V

Where Used

  • Higher frequency, lower voltage migration path for the PCF8584
  • Add I²C-bus port to controllers/processors that do not have one
  • Add additional I²C-bus ports to controllers/processors that need multiple I²C-bus ports
  • Converts 8 bits of parallel data to serial data stream to prevent having to run a large number of traces across the entire PC board

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CBTL05024BS High Performance Multiplexer/Demultiplexer Switch

CBTL05024 Block Diagram

CBTL05024 Block Diagram

CBTL05024 multiplexer/demultiplexer switch chip supports 10.3125 Gbit/s v1.2 channels and it is used to interface the Thunderbolt/MiniDP connector with Thunderbolt systems. It features 3:1 switch TB MUX and 2:1 switch DP MUX. Also, it includes HPD and CA_DET buffers for HPD_IN and CA_DET control signals.

The TB MUX is a 3:1 switch that selects between Thunderbolt data path and DisplayPort v1.2 side-band signals – either DDC or AUX. The DP MUX is a 2:1 switch that selects between DP ML (DisplayPort Main Link) and LS TX/RX signals. Both LSTX and LSRX are the side-band signals for Thunderbolt channel. The CBTL05024 chip is powered by a 3.3 V supply and it is available in a 3 mm x 3 mm HVQFN24 package with 0.4 mm pitch.

Why Used

  • The input of the HPD (Hot Plug Detect) buffer is 5 V tolerant
  • Integrated LSRX buffer with 1 MΩ pull-down resistor (R1) on the LSRX buffer input
  • Integrated 8.75 kΩ pull-up resistor (R4) on the LSTX pin
  • Very low intra-pair differential skew (5 ps typical)
  • All channels support rail-to-rail input voltage

Where Used

  • Thunderbolt/MiniDP Applications
    • PCIe graphics cards
    • PC monitor display

 

 

DSI Slave for Remote Sensing

 

Simplified Internal Block Diagram

Simplified Internal Block Diagram

MC33793 IC is a slave Distributed System Interface (DSI) device. The device is optimized as a sensor interface and contains circuits to power sensors such as accelerometers and to digitize the analog level from the sensor. The device is controlled by commands over the DSI bus and returns measured data over the bus. This device is powered using SMARTMOS technology.

Why Used

  • 4 pins configurable as analog or logic inputs or as logic outputs
  • Conforms to DSI specification version 1
  • 4-channel, 8-Bit analog-to-digital converter (ADC)
  • Provides regulated +5.0 V output for sensor power from bus
  • Additional high-drive logic output

Where Used

  • Automotive, aircraft, marine and industrial control and safety systems
  • Simple bus-controlled part for remote control and sensing
  • Heating and air-conditioning

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