Friday, May 13, 2022
Thursday, May 12, 2022
Simple Capacitive Touch Sensor Controller
If you need a simple capacitive touch sensor to our project, Microchip's CAP1203 is a good choice. It is a multiple channel capacitive touch sensor controller with calibrated to compensate for system parasitic capacitance and automatically recalibrated to compensate for gradual environmental changes. The best thing about this chip is low power consumption at deep sleep mode. It can be used as a touch slider and worked under 6 mm thickness of plastic or wood or almost any materials.
Tuesday, May 10, 2022
Altium Designer : PCB Planes Pullback implementation
There are many ways to implement polygon planes pullback in Altium. One of my prefer way is utilizing design rules as below.
Alternatively, we can make use of keep-out layer to define polygon pullback.
Thursday, May 5, 2022
WORKMANSHIP STANDARD FOR POLYMERIC APPLICATION ON ELECTRONIC ASSEMBLIES
Reference : NASA-STD-8739.1B – 2016-06-30
This is a good refereence standard for staking, conformal coating, bonding and encapsulation of PCB.
STAKING: Staking usually be performed prior to conformal coating and stamking material should be free from contamination.
Default Staking for Horizontally-Mounted Sleeved or Sleeveless Cylindrical Part
Single Wire Staking
Staking for Radial Lead Components
Staking for Radial Multi-lead Rectangular Components
Default Staking of a Single Vertically-Mounted Rectangular Part
Default Staking for an Array of Vertically-Mounted Rectangular Parts
Wire Bundle Staking
Fastener Staking , Locking of Screws and Bolts with Nuts
Thread Locking of Blind Screw
Torque Striping Methods
CONFORMAL COATING, Spray Application
CONFORMAL COATING, Bubbles
CONFORMAL COATING, Scratches
CONFORMAL COATING, Liftting and Peeling
CONFORMAL COATING,Coverage Defects
COMPONENT BONDING, Excess Bonding Material
ENCAPSULATION, Encapsulating Wires at Connector
ENCAPSULATION, Modules
Open LED Protection for LED Strings
LEDs are fragile solid-state devices. An LED is essentially a diode, structured as a P-N junction that emits light when forward biased. One of the major causes of an electrical open in an LED is thermomechanical stress on the wire bonds. Other causes of LED open circuits are electrostatic discharge (ESD) events or surges induced by nearby lightning events. These threats are especially high in outdoor applications. Devices such as MOVs, fuses, and TVS diodes are essential components of a circuit protection strategy, because they can prevent transients and surges from damaging delicate LEDs. However, none of these traditional circuit protection devices can prevent an entire string of LEDs from going out if a single LED fails.
An open LED protector is can be connected in parallel with each LED in a string; it will shunt current around an openfailed LED to keep the rest of the string lit. When LED fails open-Circuit, the open LED protector goes into conduction, limiting its voltage drop to about 1.3V and keeping the rest of the string operating.
Voltage-Tracking LDO With 4-mV Tracking Tolerance
Voltage-tracking low dropout regulator (LDO) is widely used in automotive off-board sensors and small current off-board modules for its off-board protection and high voltage-tracking accuracy advantages.The output of the device is accurately regulated by a reference voltage at the ADJ pin.
Altium Designer : Solving the Component Management Challenge with Alticve BOM
ActiveBOM is a powerful Bill of Materials management editor that brings comprehensive BOM management tools together with Altium's powerful part-information aggregation technologies, helping you manage the component selection challenge.
Friday, April 29, 2022
Component Cross Reference Search
Nowadays, component supply chain issue is quite common and designers need to do component cross referencing from different suppliers. Here are a list of cross reference component search websites from manufacture and others.
If you guys have more useful links, please leave it in comment session.
Other Sites
https://octopart.com/?gclid=EAIaIQobChMI6OKQw5y49wIVcZNmAh1mqwCpEAAYASAAEgLvivD_BwE
https://partcross.com/semiconductor-manufacturers/Atmel/
http://ebook.pldworld.com/_Semiconductors/Atmel/Databook%20CDROM/Atmel/xref2.htm
https://gct.co/connector-cross-reference
http://www.cross-parts.com/news/shortcut/shortcut-data/L23.html
https://clockworks.microchip.com/microchip/crossref
http://www.cross-parts.com/news/M_search.php?nWord=NEC
https://www.we-online.com/web/en/electronic_components/produkte_pb/toolbox_pbs/Cross_Reference_1.php
Friday, November 19, 2021
What is the difference between lux and lumens?
It is good to know the difference between Lux and Lumens if you are designing lighting products.
The core difference can be summarized as follows:
- Lux is a measure of illuminance, the total amount of light that falls on a surface
- Lumens is a measure of luminous flux, the total amount of light emitted in all directions.
Tuesday, September 21, 2021
Voltage controlled Current Source Circuit
Wednesday, September 2, 2020
Basics of eFuses
eFuses are integrated power path protection devices that are used to limit circuit currents, voltages to safe levels during fault conditions. eFuses offer many benefits to the system and can include protection features that are often difficult to implement with discrete components. Discrete solutions are bulky, inefficient, do not incorporate thermal protection, need more components and occupy more board space. More components also raise concerns on protection-circuit robustness and reliability.
Different types of eFuses are available in the market. Here
is one of my favorite eFuses, TPS259271 from TI.
This chip is a robust defence against overloads, shorts
circuits, voltage surges, excessive inrush current, and reverse current. It
also offers Controlled Power Down, Over Temperature Protection, Health
Monitoring and Reporting.
Ultra-Precise, Current-Sense Amplifier
This ultra-precise current sense amplifier that can measure voltage drops across shunt resistor, R1 over a wide common mode range from 2....
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXD7hy58BQ3kexcGjf3Q1nyxZDLL6NT5Z-ahsUw68QFliy_mOuyfMSlg2SSk8NhAH2z3prNS9I3NnMVwmGkLgPNX6B2npIpzNW7bsKXGesne83dXMlbOl_veEWOx8pFYA4lpVJX5iHzfS2qlvXysZRS3LwaAaqTZE-LCTi1Q8OG7l4G_lbPqdNjQv6sMU/w400-h314/1.png)
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Voltage divider resistor network is used to step monitored voltage down to the range as necessary for A/D conversion. Passive low-pass f...
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Import Changes from Schematics to PCB in Alitum as below. 1) Compile the Project 2) Design >> Import Changes From XXX.PrjPCB 3)Execut...