Monday, October 22, 2018

7800 and 7900 Series Voltage Regulators

The LM78XX series of three-terminal positive regulators is available in the TO-220 package and with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shut-down, and safe operating area protection.

7805 is popular for Embedded Systems and 7905 is sometimes used for the Dual Supply needs in such Microcontroller cards with Mixed Design sub-sections like A/D or Opamps.

7812 and 7912 are very popular in powering Traditional Opamp or communications circuits with a stable and reliable Dual Supply.

Power Supplies Section - Here you will find examples of 7824 and 7924 Power supplies.
Fairchild LM7812

In Instrumentation and Industrial Circuits where Size is not a problem and the current or power usage is less. A Mains transformer, bridge regulators, capacitors and these regulators are a time tested low noise and robust system.

SMPS does have EMI-RFI problems, hence use when small sizes are needed and high currents are required. In battery powered devices switching supplies are inevitable as they are power efficient.

MC7800 MC7900 1 Amp Voltage Regulators

These voltage regulators are monolithic integrated circuits designed as fixed−voltage regulators for a wide variety of applications including local, on−card regulation. These regulators employ internal current limiting, thermal shutdown, and safe−area compensation. 78 and 79 series voltage regulators are the most common in power supplies and easy to use.

Monday, October 15, 2018

ICM7217 Presettable Up-Down Counter

The ICM7217 is a four digit, presettable up/down counter with an onboard presettable register continuously compared to the counter. The ICM7217 is intended for use in hard-wired applications where thumbwheel switches are used for loading data, and simple SPDT switches are used for chip control.

ICM7217 Presettable Up-Down Counter

This circuit provides multiplexed 7 segment LED display outputs, with common anode or common cathode configurations available. Digit and segment drivers are provided to directly drive displays of up to 0.8 inch character height (common anode) at a 25% duty cycle.

ICM7217 Presettable Up-Down Counter

The frequency of the onboard multiplex oscillator may be controlled with a single capacitor, or the oscillator may be allowed to free run. Leading zeros can be blanked. The data appearing at the 7 segment and BCD outputs is latched; the content of the counter is transferred into the latches under external control by means of the Store pin.

Multiplexed Presettable Timer with ICM7217
  • Four Decade, Presettable Up-Down Counter with Parallel Zero Detect
  • Settable Register with Contents Continuously Compared to Counter
  • Directly Drives Multiplexed 7 Segment Common Anode or Common Cathode LED Displays
  • On-Board Multiplex Scan Oscillator
  • Schmitt Trigger On Count Input
  • TTL Compatible BCD I/O Port, Carry/Borrow, Equal, and Zero Outputs
  • Display Blank Control for Lower Power Operation; Quiescent Power Dissipation <5mW
  • All Terminals Fully Protected Against Static Discharge
  • Single 5V Supply Operation

Three Point Preset Counter

delabs Notes-

This is another Intersil Masterpiece in days when using uP was complex and uC was not available.A 8085 could be used but with many supporting chips and it consumed power. This was a CMOS innovation low on power and just one ASIC had the fexibility for many digital operations.A ThumbWheel and Display Interface completed a Gadget.

Tuesday, October 02, 2018

LM336-2.5 - Voltage Reference Diode

The LM136-2.5/LM236-2.5 and LM336-2.5 integrated circuits are precision 2.5V shunt regulator diodes. These monolithic IC voltage references operate as a low-temperature-coefficient 2.5V zener with 0.2 dynamic impedance. A third terminal on the LM136-2.5 allows the reference voltage and temperature coefficient to be trimmed easily.

LM336-2.5 - Voltage Reference Diode

The series is useful as precision 2.5-V low-voltage references (VZ) for digital voltmeters, power supplies, or operational-amplifier circuitry. The 2.5-V voltage reference makes it convenient to obtain a stable reference from 5-V logic supplies.

LM336-2.5 - Voltage Reference Diode

Features
  • Low temperature coefficient
  • Wide operating current of 400 µA to 10 mA
  • 0.2 dynamic impedance
  • ±1% initial tolerance available
  • Guaranteed temperature stability
  • Easily trimmed for minimum temperature drift
  • Fast turn-on
(This was used by me in the manufacture of Indicators and Controllers and was used in place of ICL8609  as that was not in supply)

Related Resources -

ETX, modification of electronic circuit - By changing the 2,5 Volt reference diode from a fixed LM385 to an adjustable LM336 of 2,5 V, The DC motor voltage and therefore the motor speed can be adjusted.

Precision Op-Amp Current Source - In this circuit we tackle the error indicated in the earlier Current Source. The LM336-2.5V eliminates the tiny error of the regulated supply and resistors. Thereby increasing Precision to a higher degree.

Sunday, September 16, 2018

Infineon Technologies - Advanced Semiconductors

They have chip and system solutions for automotive and industrial electronics. They also specialized semiconductor IC for chip card and security applications.

Infineon Technologies - Advanced Semiconductors

Industrial, Lighting, Wireless Communications are other areas. The Industrial Power Control (IPC) Division have solutions for electrical drives and energy generation components in solar or wind power plants.

Products Include Consumer Electronic ICs, Fiber Optics, Microcontrollers, Power Semiconductors for Automotive, Power Semiconductors, Chip Card + Security ICs, Trusted Computing, Sensors, Small Signal Discretes.

Infineon XMC4500 ARM Cortex-M4F Demo

The modular design kit for the XMC4500 series. Up to three additional application boards - for actuators and sensors (top), for human-machine interface (HMI) functions (right), and for communication with other systems (left) - can be connected to the basic design board with XMC4500 (middle), depending on the respective application requirements.

Infineon XMC4500 ARM Cortex-M4F Demo

This page documents a demo application that uses the FreeRTOS GCC ARM Cortex-M4F port. It targets the Infineon XMC4000 Hexagon Development Kit CPU board, which is populated with an XMC4500 microcontroller.

Infineon Technologies - Wikipedia

Infineon Technologies was founded in April 1999 when the semiconductor operations of parent company, Siemens AG, were spun off to form a separate entity.

Infineon Technologies
Am Campeon 1-12 Neubiberg, München, 85579, Germany.

Monday, September 10, 2018

LM335 - Precision Temperature Sensor

The LM135, LM235, LM335 are precision temperature sensors which can be easily calibrated. They operate as a 2-terminal Zener and the breakdown voltage is directly proportional to the absolute temperature at 10mV/°K.

LM335 - Precision Temperature Sensor

Precautions should be taken to ensure good sensing accuracy. As in the case of all temperatures sensors, self-heating can decrease accuracy. The LM135, LM235, and LM335 should operate with a low current but sufficient to drive the sensor and its calibration circuit to their maximum operating temperature.

LM335 - Precision Temperature Sensor

Above data from STMicro - Circuit shows a design using LM335 for Temperature Control.

LM335 Cold Junction Compensation

Temperature Sensors like Thermocouples need cold junction compensation as a part of front end signal conditioning, this is done at the terminal block where the Thermocouple wires are terminated. This design has to be more accurate and broad, if the design we make has to work well in both Tropical and Temperate Climate Zones.

Thermocouple Temperature using DPM or DMM

Temperature measurement and control uses the Thermocouple and the Seebeck Effect for measurement. The most common is J Type as it is affordable. K is better and works well even at higher temperatures too.

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