Monthly Archives: February 2017

10-bit bidirectional low voltage translator

Allowing bidirectional voltage translations between 1.0 V and 5.0 V without use of a direction pin, the GTL2010 provides 10 NMOS pass transistors (Sn and Dn) with a common gate (GREF) and a reference transistor (SREF and DREF). When the Sn or Dn port is LOW, the clamp is in the ON-state and a low resistance connection exists between the Sn and Dn ports. Assuming the higher voltage is on the Dn port, when the Dn port is HIGH the voltage on the Sn port is limited to the voltage set by the reference transistor (SREF).

All transistors have the same electrical characteristics and there is minimal deviation from one output to another in voltage or propagation delay. This is a benefit over discrete transistor voltage translation solutions, since the fabrication of the transistors is symmetrical.

Block diagram: GTL2000DGG, GTL2000DL, GTL2010BS, GTL2010PW

Block diagram: GTL2000DGG, GTL2000DL, GTL2010BS, GTL2010PW

Why Used

  • Provides bidirectional voltage translation with no direction pin
  • Supports hot insertion
  • No power supply required: will not latch up
  • Low standby current
  • Flow-through pinout for ease of printed-circuit board trace routing

Where Used

  • Any application that requires bidirectional or unidirectional voltage level translation from any voltage from 1.0 V to 5.0 V to any voltage from 1.0 V to 5.0 V
  • The open-drain construction with no direction pin is ideal for bidirectional low voltage (for example, 1.0 V, 1.2 V, 1.5 V or 1.8 V) processor I²C-bus port translation to the normal 3.3 V and/or 5.0 V I²C-bus signal levels or GTL/GTL+ translation to LVTTL/TTL signal levels

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24-channel UFm 5 MHz I2C-bus 57 mA/20 V constant current LED driver

Optimized for dimming and blinking 57 mA Red/Green/Blue/Amber (RGBA) LEDs in amusement products, the PCU9956A is an Ultra Fast-mode (UFm) I²C-bus controlled 24-channel constant current LED driver which is the first LED controller device in a new UFm I²C-bus family. Each LED output has its own 8-bit resolution (256 steps) fixed frequency individual PWm controller that operates at 31.25 kHz with a duty cycle that is adjustable from 0% to 99.6% to allow the LED to be set to a specific brightness value.

UFm I²C-bus devices offer higher frequency (up to 5 MHz). the UFm I²C-bus slave devices operate in receive-only mode. That is, only I²C writes to PCU9956A are supported. As such, there are no status registers in PCU9956A. The PCU9956A allows significantly higher data transfer rate compared to the Fast-mode Plus version (PCA9956A).

Block diagram of PCU9956A

Block diagram of PCU9956A

Why Used

  • 24 constant current output channels can sink up to 57 mA, tolerate up to 20 V when OFF
  • Output current adjusted through an external resistor (REXT input)
  • Thermal shut-down for overtemperature
  • Software Reset feature (SWRST Call) allows the device to be reset through the I²C-bus
  • ESD protection exceeds 3000 V HBM per JESD22-A114

Where Used

  • Amusement products
  • RGB or RGBA LED drivers
  • LED status information
  • LED displays
  • LCD backlights
  • Keypad backlights for cellular phones or handheld devices

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NXP Mantis™ HS-CAN transceivers

Enabling significant system cost savings in applications, mantis is a family of high-speed CAN transceivers that provide an interface between a Controller Area Network (CAN) protocol controller and the physical two-wire CAN bus. These transceivers demonstrated that they meet today’s EMC requirements without requiring a common-mode choke.

The transceivers are designed for high-speed CAN applications in the automotive industry, providing the differential transmit and receive capability to (a microcontroller with) a CAN protocol controller. Mantis offers a feature set optimized for 12 V automotive applications, an excellent ElectroMagnetic Compatibility (EMC) performance and a dual sourced manufacturing base.

Block Diagram of TJA1044, a part of the Mantis family

Block Diagram of TJA1044, a part of the Mantis family

Why Used

  • Fully ISO 11898-2 and ISO 11898-5 (TJA1044 only) compliant
  • Optimised for use in 12 V automotive systems
  • Functional behavior predictable under all supply conditions
  • Transmit Data (TXD) dominant time-out functions
  • Undervoltage detection on pin VCC

Where Used

  • Automotive applications
  • Industrial applications

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