controller Charge Pump?

[Luciano]

See this link:
http://wbo2.com/2a0/schem.htm

[toalan]

that is the techedge one, I am not looking to "bite" his design. His design is overly complicated in my opinion.

[Luciano]

Hi,

Feel free to "bite" the BOSCH design.
(See the block diagram of the IC CJ110).

But, doesn't it look familiar somehow?

Luciano

* * *

CJ110 - Lambda Probe Sensing IC for LSU4.
http://www.semiconductors.bosch.de/p...y_extended.pdf


CJ120 - Lambda Probe Sensing IC for LSU4.x
Ri Measurement; SPI-Interface; Diagnostics
http://www.semiconductors.bosch.de/p...y_extended.pdf


Source:
http://www.semiconductors.bosch.de/e...ine/engine.asp

* * *
Bosch LSU 4.2 Planar Wide Band Lambda Sensor:
http://wbo2.com/lsu/Y258K01005e03mar21eng.pdf

* * *

[toalan]

humm, I was gonna do the design myself without the BOSCH IC, I was looking around for vendors of the BOSCH IC and never found any.

[Luciano]

Europe

http://www.semiconductors.bosch.de/e...tributoren.asp
http://www.rutronik.com/english/index.html
http://www.rutronik.com/produktderwo...kw09/index.php

The CJ110 and CJ120 are on this list:
http://www.rutronik.com/download.php...osch-Flyer.pdf


USA

http://www.bosch.us/content/language1/html/1284.htm

Robert Bosch Corp.
38000 Hills Tech Drive
Farmington Hills, MI 48331
By telephone: 248-553-9000
By fax: 248-553-1426

[toalan]

TY for the info.

[Luciano]

Hi,

Print the page 3 and 4 of the CJ120 PDF.
(The Block diagram page and the Application circuit page).

http://www.semiconductors.bosch.de/p...y_extended.pdf

Add to the application circuit the two op-amp's and connect them
as they are depicted on the block diagram page.
(Draw that with a pencil inside the CJ120 on page 4).


The two op-amp's:
Pumpstrom-Regler = Pump current control
Pumpstrom-Meßverstärker = Pump current sense amplifier


Voltages:

==============================================
PIN Vcc = +5 V
==============================================
PIN VM = +2.5 V (Virtual ground voltage source)
(0.5 x VCC)
==============================================
PIN US = +2.95 V (Nernst cell reference voltage source)
(450mV, reference to virtual ground)
===============================================
PIN GND = 0 V
================================================

The two op-amp's have a single polarity supply.
(+5 and GND).

On the output of the op-amp "Pump current control"
you will need a 100 ohm resistor.


* * *

The idea is to replicate what Bosch is doing inside the CJ120.

You will need a way to simulate the LSU4 during the testing of the circuit.
(DC +/- milliampere meter and a voltage that goes from 4.0V down to 2.5).

Do you understand how it works?

Luciano