Questions tagged [bidirectional]

Bidirectional implies that a single pathway allows for power or signals to flow in both directions.

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64 views

Bi-directional Line Termination using series resistor (s)

I am designing a PCB for an ST micro MCU with external SDRAM. On the demo board, ST is using one(1) series resistor termination for the bidirectional data lines. ST places this resistor at about 30/70%...
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1answer
50 views

Bi-directional Three State IO and microprocessor gpio

I want to use an MP5010B Electronic Fuse IC. I will enable or disable it by using the Enable/Fault pin which is billed as a bi-directional three state IO. I will enable or disable this pin using a ...
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116 views

How to form a 8-Bit bidirectional shift register using two 4-bit bidirectional shift registers?

I really had some trouble with one design question in my homework (the deadline has passed). We were asked to design a 4-bit bidirectional shift register using D-Flip flops and after that to create a ...
5
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1answer
109 views

A simple analog neural network to implement the XOR operation

I am reading this paper and wanted to replicate some of the results as part of a learning process. I'm more of a digital guy but obviously have had some analog design as part of my studies. ...
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1answer
199 views

Two directional FET switch. Is it possible?

Is it possible to have a high side MOSFET switch that will allow any direction of current? I was trying to design one but without the success. Or should I use a relay?
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23 views

LIN bus extender

I have an application where the nodes may be 40m apart and want to make each node a repeater as well as an operating node with a microprocessor (PIC16F1829 say). Am thinking about two MCP2021A back ...
2
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1answer
97 views

Is there a simple IC for disconnecting a power source?

I'm looking to create a simple circuit to connect/disconnect a power storage capacitor to/from a larger circuit. In the model railroading world, we use capacitors as "keep-alives" to keep ...
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0answers
61 views

8-bit quasi-bidirectional I/O port

The schematic attached is from a very old device. It's using the microcontroller SAB 80535. According to the datasheet P5.7-P5.0 is an 8-bit quasi-bidirectional I/O port. There's a keyboard, a LCD and ...
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1answer
77 views

Digital isolator says it is bidirectional but its block diagram does not follow that statement

I am wondering if ADUM1285CRZ is Bidirectional or unidirectional digital isolator. It says it is Bidirectional, but the block diagram says otherwise. Tha datasheet block diagram shows one direction ...
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1answer
20 views

Analogue switch TS3A475 does the direction matter?

Does the "direction" of the signal matter? signal is 1/3Vcc to 2/3Vcc
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1answer
57 views

Bi-directional on/off toggle soft power latch

I need a one-button on/off toggle power latch to connect/disconnect a 36V battery to two VESC-controlled 500W motors with regenerative braking. Most of the designs I found for soft latching circuits ...
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1answer
111 views

3.3V to 5V logic level shifter with 3.3V microcontroler board and 5V arduino sensor

I would like to use logic level shifter like the one above. 3.3V logic level would be connected on NodeMcu 3.3V microcontroller board pin, while 5V level would be used for Arduino sensor. What ...
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1answer
99 views

Bidirectional buck boost converter [closed]

I am searching for a bidirectional buck boost converter evaluation board for charging and discharging the batteries. Input= upto 30V DC Output= upto 10V to 20V DC Current= less than 10A I always ...
0
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1answer
84 views

VFD Motor Bidirectional Control

So I have a control panel which controls the speed and direction of a motor in a sliding mechanism. the direction can be inverted using a tri-state selector on the panel. the selector input is a ...
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0answers
177 views

Common Source vs. Common Drain for N-Channel Switches

Most discrete load switches I have seen (Using N-Channel FETs) have been in the common-source configuration. What, if any, are the operational differences between this and the common-drain ...
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2answers
329 views

How to control the non-isolated bidirectional buck-boost converter?

I have been working on a control software for below given bidirectional buck-boost converter. The planned usage is for charging and discharging of a traction battery in electrical vehicle. I am not ...
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1answer
164 views

Power factor down after solar connection

We installed solar plant in factory. After that power factor goes down to 0.16. Normally it never goes below 0.85 in history even if we keep APFC off. We always maintained it to 0.99. Note - Main ...
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1answer
111 views

SMD potentiometer direction

I currently struggling with a circuit and trying to identify the parts which may cause the problem. The circuit needs a trim potentiometer. Mine looks like with the symbol Does the direction have ...
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2answers
137 views

Bi-directional electronic switch for external circuitry

I am in the process of designing a PCB that is powered by a 10V / 1mA supply from a fandeck (incorporating EC/DC fan motors). One of the functionalities include having continuity between 2 pins on ...
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3answers
481 views

How does an auto bidirectional voltage translator work?

I'm trying to understand how the auto bi-directional voltage translators work. Background: I have to choose a part that can translate signals in both ...
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1answer
1k views

How to make a bidirectional power switch for negative supply rail controlled from logic level MCU

I'm looking to build a bidirectional power switch for a negative power rail. I have a +12V, +5V, +3V3 and -5V supply to switch. For the positive supplies, I'm using two P-channel mosfets in a common ...
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1answer
70 views

Question about bi-directional pin from Roth reference

I now am studying the tri-state buffer from the reference "Fundamental of Logic Design", 6th edition, By: C. H. Roth and L. L. Kinney. I found that circuit of a bi-directional pin as application of ...
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2answers
766 views

How to find a truly bi-directional level shifter?

I'm trying to create an interface PCB to a 32 channel USB GPIO device which has 3.3v IO, and I want the flexibility to use 1.8, 3.3 or 5v - across all pins, or at most in 2x banks of 16 - I don't need ...
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1answer
51 views

DC Motor Controller: hacking it bidirectional?

I just picked up two of these DC motor controllers (https://www.amazon.ca/Controller-Yeeco-Universal-0-01-1000W-Generator/dp/B00RZ97DDQ/ref=sr_1_10?dd=1QzB1w0bE3cxmYrmXew-NA%2C%2C&ie=UTF8&qid=...
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1answer
73 views

Can I use TXB0104B bidirectional level shifters on the Intel 8085 NMOS CPU buses?

I want to connect an old Intel 8085 CPU to an FPGA board. The basic issue is that the 8085 works at 5V while the FPGA will not accept any voltage avobe 3.3V so I decided to use the TXB0104 / TXB0108 ...
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2answers
262 views

state-space model for bidirectional buck-boost with input capacitors

I'm having some trouble simulating the behaviour of a bidirectional buck-boost converter for battery charging purposes. The circuit looks as follows: I would like to create an averaged state-space ...
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0answers
250 views

How can I size the current ripple of a DC-DC converter for lithium batteries

I am designing a bidirectional DC-DC converter to charge and discharge batteries on a DC bus. The power of this converter is 50 kW and the average current in the inductor (the same as that on the ...
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1answer
1k views

bidirectional buck/boost converter vs separate buck and boost converters

I have recently leared about bidirectional buck/boost converters. They can be used in hybrid vehicles for optionally charging a 12v battery from a higher voltage battery or vice versa. How would one ...
2
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1answer
2k views

Verilog - connecting multiple bidirectional buses

I've been designing a retro computer in verilog as an exercise and so far have a simple 8-bit CPU that communicates directly with a single RAM chip via a bidirectional data port. This works great in ...
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204 views

Transmission gate simulation

When the voltage on node n-mosfet is a Logic 1, the complementary Logic 0 is applied to node active-low n-mosfet, allowing both transistors to conduct and pass the signal at IN to OUT. When the ...
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0answers
57 views

How do the parasitic elements behave in a bidirectional power switch made from back-to-back MOSFETs?

I would like to know how to determine the value of the total internal gate mesh resistor (Rg) and different parasitic capacitors especially Cgs and feedback capacitor Cds of a bidirectional power ...
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1answer
3k views

in SPI, can MOSI and MISO be connected together?

I'm using an 8051 series microcontroller, and documentation states that if I use serial mode 0, then its RXD pin can function as a bi-directional pin (both input and output) while TXD is strictly a ...
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2answers
895 views

Replacement Triac

I have a simple dimmer module with a busted Triac MAC97A6. I want to replace that component so that the module will work again but stores near my area don't have that specific component. One store ...
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0answers
138 views

Choice of the right stepper motor

I need to make a precise angular rotator for my directional antenna. The goal is to rotate the antenna at a precise angle. Arduino stepper motor library has functionalities to run a stepper motor for ...
0
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1answer
1k views

Bidirectional USB Type C charging

Recently I bought a ready PCB that is basically a power bank when 18650 batteries are connected This. It has a micro USB port to charge the 18650s and two USB type A one of which output is 1A and the ...
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2answers
940 views

Pull-up resistors needed for quasi-bidirectional push-pull PCF8575/PCF8574(A)

I wonder if I need pull-up resistors when using the PCF8575 I/O extender. It's not directly mentioned in the datasheet (http://www.ti.com/lit/ds/symlink/pcf8575.pdf). The datasheet does remark that ...
3
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2answers
3k views

Does the Bluetooth protocol inherently support bidirectional data transfer?

Bluetooth is used for a lot of devices that send data in one direction: keyboards, mice, headphones. If it was designed for that, I would think that it was originally specified to only send data in ...
0
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1answer
154 views

Reverse current in a wire (flip flop current directions)

I'm working with 0 to 5 volts. I was wondering if there was any way, preferably with transistors, less preferably with ICs, to "flip flop" the 5 voltage magnitude across a single wire. For example, ...
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3answers
3k views

How do you find out if a MUX is bidirectional

I've used this MC74VHC157 in a project thinking this would be bidirectional but I'm not sure. How do you find out if any MUX is bidirectional?
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4answers
329 views

10Mbps bidirectional wireless transmission with an MCU [closed]

I have a Teensy 3.6 microcontroller it has the following specs 180 MHz ARM Cortex-M4 with Floating Point Unit 1M Flash, 256K RAM, 4K EEPROM Microcontroller Chip MK66FX1M0VMD18 (PDF link) USB High ...
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1answer
297 views

Help with Flash memory to GPIO pins on FPGA dev board

Been trying to access the FLASH memory on this DE1 dev board, but having no luck. I'm using this to interface with a Super Nintendo system, and I'm trying to read a small test ROM file stored on the ...
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2answers
765 views

Can I drive MOSFET gate with an isolated voltage source?

I have two N-channel MOSFETs. I want to make a simple bidirectional solid state relay by using them. I want to place them back to back as seen in the schematic below, and drive them with a controlled ...
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0answers
402 views

Bidirectional Converter Switching problem on Mosfet

I want to ask. I designed a bidirectional converter with synchronous buck converter as the circuit configuration. The problem is, the switching mosfet. When i applied lower voltage at the input (10V), ...
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0answers
566 views

Analysis of a Bi-directional DC-DC converter

I'm building a bi-directional DC-DC converter that will be used to charge and discharge a supercapacitor stack. The design we came up with uses a 4-quadrant chopper, to allow buck-boost both ways. I'...
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2answers
1k views

help me make a bi-directional motor circuit? [closed]

the first circuit is supposed to make the motor moves clockwise and anti clock wise according to the potentiometer. the figure's components are IC1: 741 op-amp Q1: TIP3055 NPN Q2: MJE34 PNP (yea it's ...
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2answers
2k views

Bidirectional digital Isolation

I have used digital Isolators before in unidirectional Designs. I am now faced with isolating a bidirectional digital signal line. Specifically I would like to isolate the 2-wire debug interface of ...
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3answers
1k views

Bidirectional termination from one end only

Problem I have been trying to figure out if it is possible to terminate a bidirectional bus from one end only. I have found techniques for terminating a bidirectional bus using both sides of the line,...
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3answers
2k views

What actually happens when we set direction on GPIOs in controllers ?

Generally, while working on GPIO pins of any controller/device, we set the directions for the GPIO pins. Let's say in LPC2148(ARM7 core) controller, we have IODIR to configure the direction of Pin. We ...
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2answers
1k views

Will an FPGA get damaged if contention occurs on a bidirectional pin on it?

I was told in the university that bus contention can cause hardware damage. I am referring to a situation where two pieces of hardware force/drive different logic levels on the same signal. Taking ...
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1answer
1k views

Difference between Bidirectional TVS diode symbols

I am intending to use this CDSOT23-T05C Bidirectional TVS diode in my design to protect two separate data lines, however the symbols in the datasheet are contradicting conventional rules. This is how ...