Input 0-5V output 7-14 mA for automotive application

Something like this should do you, assuming a floating load (eg. a coil)

+----------------+ | 78M05 | | .-------. | pwr | | | | +12 +--------------+---------- | ---- |Out In| +-o | | | | | | .-. | + o | | z TVS | | | '-------' A | | 100K | Out | | 100K '-' | - o === === ___ | 1/2 LM358|\| | GND GND o-|___|---+------------|-\ |/ | | >--------| MMBT4401 0~5V for 7~14mA .-. +--|+/ |> | | | |/| | | | +----|-----------+ '-' | .-. | | | | | 20K || 680K | | |100 | | '-' | | | | | | | | | | | | | | | | | | +--------------+-----------+ | === GND

Compliance is about 1.5V less than the power supply voltage, and it will work down to less than 7V input.

Sorry, fixed inverting/non-inverting inputs on op-amp. Hopefully first. ;-)

Il giorno martedì 1 ottobre 2013 23:59:14 UTC+2, Spehro Pefhany ha scritt o:

===

I'm sorry with which software I can watch the text????

View in fixed-width font on any text editor.

Best regards, Spehro Pefhany

--
"it's the network..."                          "The Journey is the reward" 
speff@interlog.com             Info for manufacturers: http://www.trexon.com 
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

Go to TI's website and look athe XTR family of products. Art

$20 chip ?

Il giorno mercoledì 2 ottobre 2013 23:40:11 UTC+2, snipped-for-privacy@gmail.c om ha scritto:

TI's website and look athe XTR family of products. > > Art $20 chip ?

Ok 20$? how can I do?

.com ha scritto:

o TI's website and look athe XTR family of products. > > Art $20 chip ?

Probably not with that line of product... I can only guess you're dealing w ith a digital two-wire current interface, but you need to put a name to it or at least tell us the source and destination devices because there are a multitude of automotive protocols with different electrical characteristics and bandwidths.

Il giorno giovedì 3 ottobre 2013 16:28:03 UTC+2, snipped-for-privacy@gmail.com ha scritto:

:

il.com ha scritto:

to TI's website and look athe XTR family of products. > > Art $20 chip ?

with a digital two-wire current interface, but you need to put a name to i t or at least tell us the source and destination devices because there are a multitude of automotive protocols with different electrical characteristi cs and bandwidths.

I only know which I have to simulate a phonic sensor with a Voltage and I g et this signal in a ECU and. Ops I know the load is about 110 Ohm.

Thank you for your attention

This is wild guess, but the circuit below should easily perform the translation: Please view in a fixed-width font such as Courier.

. . . 5V . | . -----------+----------------+----- . | | | | . | | | | . | [180] pnp | | . | | BC558 | | . 5V |\ | | | . CMOS >--| >---[720]---+---. ---------------------> 7/14mA . IN |/ v / | | . | ----- | [2.2K] to 110R . 74LVC1G17| | npn \| | GND'd load . Schmitt | | BC548 |---+ . Buffer | |

Schematic error on first post, may or may not have been deleted:

Please view in a fixed-width font such as Courier.

. . . 5V . | . -----------+----------------+----- . | | | | . | | | | . | [180] pnp | | . | | BC558 | | . 5V |\ | | | . CMOS >--| >---[720]---+---. ---------------------> 7/14mA . IN |/ v / | | . | ----- | [2.2K] to 110R . 74LVC1G17| | npn \| | GND'd load . Schmitt | | BC548 |---+ . Buffer | |

On Fri, 4 Oct 2013 06:03:07 -0700 (PDT), snipped-for-privacy@gmail.com wrote:

--- I think what the OP had in mind was having an input signal of from 0V to 5V result in a current of from 7 to 14 milliamps through a 110 ohm load: (View using a fixed-pitch font)

. +5V>---+-----------------+ . |R1 | . [1k] | . |1% | . +------+ +--|----+ . |R2 |R3 | | | . [1k] [22100] +-|-\ | . |1% |1% | >--+ . 0->5V--+ +---------|+/ | . |R4 U1 | | . [10000] LT1077| [110] . |1% | |Rload . GND>----------+----------+----+

The pudding:

Version 4 SHEET 1 1816 680 WIRE 1056 -32 928 -32 WIRE 1392 -32 1056 -32 WIRE 1056 16 1056 -32 WIRE 1056 128 1056 96 WIRE 1200 128 1056 128 WIRE 1056 160 1056 128 WIRE 1200 160 1200 128 WIRE 1456 176 1328 176 WIRE 1392 208 1392 -32 WIRE 1328 224 1328 176 WIRE 1360 224 1328 224 WIRE 1456 240 1456 176 WIRE 1456 240 1424 240 WIRE 1200 256 1200 240 WIRE 1360 256 1200 256 WIRE 1200 272 1200 256 WIRE 928 288 928 -32 WIRE 1056 288 1056 240 WIRE 1456 288 1456 240 WIRE 928 400 928 368 WIRE 1056 400 1056 368 WIRE 1056 400 928 400 WIRE 1200 400 1200 352 WIRE 1200 400 1056 400 WIRE 1392 400 1392 272 WIRE 1392 400 1200 400 WIRE 1456 400 1456 368 WIRE 1456 400 1392 400 WIRE 928 464 928 400 FLAG 928 464 0 SYMBOL voltage 1056 272 R0 WINDOW 3 24 44 Invisible 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName Vin SYMATTR Value PULSE(0 5 0 1) SYMBOL res 1040 0 R0 SYMATTR InstName R1 SYMATTR Value 1000 SYMBOL res 1040 144 R0 SYMATTR InstName R2 SYMATTR Value 1000 SYMBOL voltage 928 272 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL res 1184 144 R0 SYMATTR InstName R3 SYMATTR Value 22100 SYMBOL res 1184 256 R0 SYMATTR InstName R4 SYMATTR Value 10000 SYMBOL res 1440 272 R0 SYMATTR InstName Rload SYMATTR Value 110 SYMBOL Opamps\\LT1077 1392 176 R0 WINDOW 0 -61 106 Left 2 WINDOW 3 -92 137 Left 2 SYMATTR InstName U1 TEXT 936 424 Left 2 !.tran 2 startup TEXT 1128 424 Left 2 ;LEVEL TRANSLATOR TEXT 1128 448 Left 2 ;John Fields, 04 October 2013 TEXT 1080 368 Left 2 ;0 to 5V

-- JF

There are a bunch of protocols and interfaces in the X-by-wire modern vehic le and the two-wire 7/14mA digital (two level) current drive is one of them . I settled on that one because the OP mentioned it was for a "phonic wheel " sensor. Phonic wheel seems to be a Euro term for any rotational wheel wit h ferromagnetic material used for obtaining an RPM count with an MR or Hall effect or some other magnetic sensor. He's dealing with a sensor producing 0-5V digital pulses but has to convert to the 7/14mA drive into 110R for t he ECU. I could be wrong, and I don't even know if the 110R is GND'ed, ther e are other implementations where the 7/14mA is done on the external VCC li ne.

--
You're probably right.

--
But, on second thought, a 0 to 5V logic signal in will put 7mA (0Vin) 
and 14mA (5Vin) through the [grounded] load. 

If the OP were to clear things up a little it would help.

I suppose if the worry is the logic, replacing Fred's ST buffer with a ST ex-or gate would allow it to be flipped. Eg. 74LVC1G86W5-7

Best regards, Spehro Pefhany

--
"it's the network..."                          "The Journey is the reward" 
speff@interlog.com             Info for manufacturers: http://www.trexon.com 
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

ehicle and the two-wire 7/14mA digital (two level) current drive is one of them. I settled on that one because the OP mentioned it was for a "phonic w heel" sensor. Phonic wheel seems to be a Euro term for any rotational wheel with ferromagnetic material used for obtaining an RPM count with an MR or Hall effect or some other magnetic sensor. He's dealing with a sensor produ cing 0-5V digital pulses but has to convert to the 7/14mA drive into 110R f or the ECU. I could be wrong, and I don't even know if the 110R is GND'ed, there are other implementations where the 7/14mA is done on the external VC C line.

I think what he is doing is using a logic output pulse generator to simula te a 7/14mA RPM sensor. This is some kind of test bed or lab setup.

Yep, that's what you want so that a 0V at the ECU indicates a sensor disconnect.