designing a battery operated device without a regulator

Started by John Smith in comp.arch.embedded14 years ago 3 replies

What are some issues associated with using vs. not using a regulator when designing a consumer electronic device that runs off...

What are some issues associated with using vs. not using a regulator when designing a consumer electronic device that runs off 2x1.5v alkalines? Obviously cost is the issue here. Do most ultra-cheap electronic devices intended to run off replaceable batteries have regulators? What drives the decision? Thanks.


Looking for DC/DC converter

Started by Meindert Sprang in comp.arch.embedded14 years ago 20 replies

Hi all, My application needs a double DC/DC converter, 5V in, dual isolated 5V out, 1W. The NMD050505S from C7D Technologies is very suitable...

Hi all, My application needs a double DC/DC converter, 5V in, dual isolated 5V out, 1W. The NMD050505S from C7D Technologies is very suitable but I want to go one step further: my application would still need a voltage regulator before the DC/DC converter to accomodate input voltages from 8-30V. What I would like is a DC/DC converter that accepts 8-30V input and produces dual isolated 5V. ...


How: microcontrolled 0-12V 1A output

Started by andrew queisser in comp.arch.embedded13 years ago 1 reply

I'd like to have my microcontroller (8051) control a 0-12V DC output voltage with up to 1A. It doesn't have to be accurate (e.g. 8bit is enough)...

I'd like to have my microcontroller (8051) control a 0-12V DC output voltage with up to 1A. It doesn't have to be accurate (e.g. 8bit is enough) and it doesn't have to be very clean - it's for an LED illuminator controller. I know I could use a linear regulator and an D/A converter or a digital potentiometer but I'm wondering if it would be better to use a switching regulator so I don't ...


Enpirion switching regulator

Started by db in comp.arch.embedded13 years ago 1 reply

A company called Enpirion(www.enpirion.com) is starting to sell a regulator, the EN5330, that is a switching regulator on a chip with...

A company called Enpirion(www.enpirion.com) is starting to sell a regulator, the EN5330, that is a switching regulator on a chip with an integrated inductor. It almost looks like you can get a switching regulator with the ease of use of a linear regulator. I was wondering if anyone knows anything more about this chip or has tried it yet. I tried contacting them for information about samples...


Pic Currrent

Started by CA Zuke in comp.arch.embedded13 years ago 21 replies

Hi, Can someone PLEASE tell me what the current (Amperes) should be for powering a pic? I use a L7805 voltage regulator but it still seems...

Hi, Can someone PLEASE tell me what the current (Amperes) should be for powering a pic? I use a L7805 voltage regulator but it still seems like I can get a whole range of different levels of current depending on the batteries use. (also you get different Amps for the L7805. Some are 0.1A and others are 1A or even 2A) I have 4 1.2V 1800mA batteries but I guess that current is far too ...


Voltage Regulator with built in bypass switch ?

Started by Anton Erasmus in comp.arch.embedded13 years ago 11 replies

Hi, Does anyone know of a 5V to 3.3V regulator with a built in bypass switch ? I.e. When I connect 5V to the regulator I want a...

Hi, Does anyone know of a 5V to 3.3V regulator with a built in bypass switch ? I.e. When I connect 5V to the regulator I want a regulated output of 3.3V. If I connect a 3.3V supply directly, I want the regulator effectively out of the circuit. (300 to 500mA on the 3.3V) Regards Anton Erasmus


Odd PIC16HV540 problem

Started by mc in comp.arch.embedded13 years ago 1 reply

I recently found, amid my stock of components, five UV-erasable PIC16HV540s. These are the PIC with the built-in voltage regulator that can...

I recently found, amid my stock of components, five UV-erasable PIC16HV540s. These are the PIC with the built-in voltage regulator that can operate from a 12-volt supply. My PICSTART Plus said at first that they weren't blank; the first 45 or so memory locations would read back as 0 rather than FF. On subsequent tries, the region of 0's grew, and now it says they're code-protected. ...


3V <-> 5V Level shifter ?

Started by Martial Chateauvieux in comp.arch.embedded13 years ago 15 replies

Hi, I want to connect a GPS Smart antenna SAM LS from u-blox, to the UART of an atmega128 running under 5V. ...

Hi, I want to connect a GPS Smart antenna SAM LS from u-blox, to the UART of an atmega128 running under 5V. Unfortunately the GPS runs in 3V and has 3V compatible IOs. I set up a 3V regulator already for the power supply. Can someone explain how to build a level shifter from 3V to 5V with a transistor ? (How do I choose it, how to...


SimmStick FPGA module

Started by Martin Schoeberl in comp.arch.embedded13 years ago 25 replies

Hi all, I'm thinking about a new board for JOP (or MB, NIOS). The board should be small and cheap (below the S3 Starter Kit). It should only...

Hi all, I'm thinking about a new board for JOP (or MB, NIOS). The board should be small and cheap (below the S3 Starter Kit). It should only contain the absolute necessary parts for a CPU design. Here is the suggested part list: FPGA: Cyclone EP1C3 or Spartan XC3S200 256Kx16 15ns SRAM 2 MBit serial Flash 3.3V linear regulation switching regulator for the core voltag...


Anyone ever use a Jeteye IR with a PIC?

Started by Mark Bramwell in comp.arch.embedded12 years ago 2 replies

A surplus store in our city is selling the "Jeteye PC" device for $1. It appears to be a rs232 IR sender/receiver in a cute small package. I...

A surplus store in our city is selling the "Jeteye PC" device for $1. It appears to be a rs232 IR sender/receiver in a cute small package. I cracked it open and found 3 SMD chips, a crystal and a 2 bulb IR device (plus a few caps and transistors). I looked up the chips with an online data sheet service. One of the chips is a 8 pin low dropout regulator. The other 2 have me stumped: ...


Renesas R8C Start up problem

Started by icegray in comp.arch.embedded10 years ago 9 replies

Hi, I have used LM1086-3.3 lowdrop regulator and R8C cpu. Reset circuit is only pull-up. CPU doesn't start up right. External oscillator...

Hi, I have used LM1086-3.3 lowdrop regulator and R8C cpu. Reset circuit is only pull-up. CPU doesn't start up right. External oscillator doesn't run when I turn on power. If I reset the CPU externaly everthing is OK. Can you recommend something?


Optrex F-51852 LCD initialization

Started by raivo leini in comp.arch.embedded12 years ago 1 reply

Hi , LCD is connected to Renesas M30626 as extended memory, unfortunately i can't get it to display anything. Connection is probably right, as...

Hi , LCD is connected to Renesas M30626 as extended memory, unfortunately i can't get it to display anything. Connection is probably right, as the LCD is answering to "status read" and also fills some commands. I got voltage converter to run, but contrast regulator and bias voltages are not running. Strange, that I have used LCDs with SID1565 and ST7565 controllers without any problems, but...


3A adaptor for driving LCD

Started by chris_ivan in comp.arch.embedded12 years ago 12 replies

Hi everybody, I have a project to build 14V/3A adaptor to drive an LCD monitor. the block diagram can be described as follow: main plug...

Hi everybody, I have a project to build 14V/3A adaptor to drive an LCD monitor. the block diagram can be described as follow: main plug (220VAC) --> step down transformer (18VAC) --> diode bridge using 1N5402 --> cap 4700uF/25V --> voltage regulator LM350T --> Voltage Divider --> DC Jack Using my DMM, I measure the unloaded output voltage is 20VDC. After I load the adaptor with rhe LC


Backup battery for AT91SAM9261

Started by rickman in comp.arch.embedded12 years ago 12 replies

Looking at the data sheet for the AT91SAM9261, it says the back up supply voltage range is 1.08 to 1.32 volts with a current of 2.5 microAmps. ...

Looking at the data sheet for the AT91SAM9261, it says the back up supply voltage range is 1.08 to 1.32 volts with a current of 2.5 microAmps. This could be supplied by a watch battery except I have no idea how to regulate the voltage to this range without draining the battery from the regulator quiessent current. I don't recall seeing any circuits that could provide a regulated voltage and...


Embedded CPU board question!!

Started by Lucky Girl™ in comp.arch.embedded11 years ago 4 replies

Hi~ I have a question about Embedded CPU board If Embedded CPU board has tow CPUs, is it very normal or high technology for Embedded...

Hi~ I have a question about Embedded CPU board If Embedded CPU board has tow CPUs, is it very normal or high technology for Embedded industry? CPU support Supports Socket 604 Dual Intel Xeon/LV Xeon processors up to 2.8 GHz with 400/533 MHz FSB or LV Xeon up to 2.4 GHz with 400/533 MHz FSB On-board intelligent switching type power regulator x 2 Supports streaming SIMD instru...


ARM 7 - your comments please!

Started by ARM7 in comp.arch.embedded11 years ago 4 replies

Hi group, I am new to ARM7 microcontrollers and would like to hear from experienced people what they recommend. I saw that the Philips ones...

Hi group, I am new to ARM7 microcontrollers and would like to hear from experienced people what they recommend. I saw that the Philips ones are pretty popular but ST have a built-in 1.8V regulator. What chip would you recommend? Are there any ARM7 with more than 64KB Ram and 1MB Flash? I am not very keen in soldering - in fact I would prefer a ready made and pretty small board with a chip...


ARM microcontroller with 2.0-3.2V supply range

Started by Anonymous in comp.arch.embedded11 years ago 11 replies

Most of the ARM microcontrollers seem to require 3.0-3.6V supply, though many have an internal regulator for 1.8V for the core. Are there any...

Most of the ARM microcontrollers seem to require 3.0-3.6V supply, though many have an internal regulator for 1.8V for the core. Are there any ARM microcontrollers that can run directly on a lithium cell (e.g., 2.0 to 3.2V supply), avoiding the need for a boost regulator or charge pump? There are a lot of 8-bit microcontrollers that will do that, so I'm somewhat surprised not to find a su...


8051 Port2 power consumption

Started by hhanff in comp.arch.embedded11 years ago 2 replies

Hi, I am using a C8051F311 MCU (Silicon Laboratories) and have connected P2(0:4) to +3.3V (+Vcc) via a DIP switch. When I close all 4...

Hi, I am using a C8051F311 MCU (Silicon Laboratories) and have connected P2(0:4) to +3.3V (+Vcc) via a DIP switch. When I close all 4 switches, the MCU consumes so much power that my voltage regulator (a 78M33) goes into thermal protection and switches off for some microseconds which resets the MCU. P2 is configured as digital input. Why is so much power consumed? Where is my mistake??? Th...


USB pin connections

Started by Anonymous in comp.arch.embedded10 years ago 2 replies

I'm new at working with USB and need some help with a design issue. My uC with USB functionality (Cypress PSoC CY8C24994) needs to operate on...

I'm new at working with USB and need some help with a design issue. My uC with USB functionality (Cypress PSoC CY8C24994) needs to operate on 3.3V but I am aware that the USB Vcc is traditionally 5V. PSoC Designer allows me to start up the uC in 3V USB operation mode, which effectively "disables voltage regulator and pass-through Vcc for pull-up", but does not indicate whether or not to ph...


LPC3180 ARM uC power supply

Started by kalyanamsaritha in comp.arch.embedded10 years ago 11 replies

LPC3180 is a ARM926EJS core which uses a 1.2V for the core, sdram, etc, and 1.8V/3.0V for IO. What power supply/regulators would be...

LPC3180 is a ARM926EJS core which uses a 1.2V for the core, sdram, etc, and 1.8V/3.0V for IO. What power supply/regulators would be recommended? Would a single regulator be recommened to achieve these multiple voltages? And how? Thanks.