26v to 5v Level Shifter

Hello!

I need a 26v to 5v level shifter (bi-directional) to connect my RFID reader with my arduino.

I was thinking of using this (Amazon.com)
but dont know where to connect the sda and scl.

I couldn't find any level shifter for my use and if you know anyone please let me know
or
if you know how to make one level shifter with my required voltages.

Thank you in advance!

26V? Why would the IO lines be at 26V?

Check that part's datasheet

No I2C interface (SCL/SDA):

The state of each switch is sampled
through an SPI™ interface by reading the status register
and any switch can be prohibited from asserting an interrupt
by writing to the command register.

The MAX13036 operates with a +6V to +26V battery voltage
applied to BAT. A separate +2.7V to +5.5V logic supply
input (VL) sets the interface voltage.

Well I just started with the electronic thing but the voltage the device use is 26v but could it be that the sda and scl lines have lower voltages?

The MAX13036 operates with a +6V to +26V battery voltage
applied to BAT. A separate +2.7V to +5.5V logic supply
input (VL) sets the interface voltage

What part do you think is running at 26v? Provide its id number and a link to its datasheet if you want more help.

Mark

Well the host that is connecting to the reader has an output with 26v. But do you suggest that I connect directly to the microcontroller?

pic16f76 is te microcontroller

Should I upload a picture inside of the RFID reader?

The way [EDIT] most level shifter chips works, the pins are tolerant to some rated voltage but the output voltage of a pin is set by the Vcc pin . The chip you cited is a switch monitor which is different in that it was designed to monitor switch states (automotive applications) . It is not a generic logic level shifter or even similar, not to mention that it is an SPI based chip , which most level shifters are not.

pic16f76 is te microcontroller

Before there were arduinos, there were PICs.

So you are saying that no matter what the sda and scl signals are allways 5v?

Or are you saying that no matter the voltage of the signal is 26v or 5v i can still connect it to the arduino?

And im gonna use NRF24L01 Wireless Shield SPI to I2C Interface to wirelessly connect the RFID reader and arduino

Or are you saying that no matter the voltage of the signal is 26v or 5v i can still connect it to the arduino?

So you are saying that no matter what the sda and scl signals are allways 5v?

[/quote]Those are I2C signal names. The chip you linked is SPI based.

So you are saying that no matter what the sda and scl signals are allways 5v?

SEE PAGE 3 OF DATASHEET
UNDER "LOGIC LEVELS" for the SDI, SDO , CS & CLK input & output voltage specs.

Those pins are designed to interface to a uC so they are logic level signals.

Switch input thresholds are set to 50% of the voltage
applied to BATREF

The MAX13036 automotive contact monitor and level
shifter monitors and debounces eight remote mechanical
switches and asserts an interrupt (INT) if a switch
changes state. The state of each switch is sampled
through an SPI™ interface by reading the status register
and any switch can be prohibited from asserting an interrupt
by writing to the command register. Four of the
switch inputs are intended for ground-connected switches
(IN0–IN3), and the other four inputs (IN4–IN7), are
programmable in groups of two for either ground-connected
or battery-connected switches. Two switch inputs
(IN0, IN1) have direct level-shifted outputs (DO0, DO1)
to be used for PWM or other timing-based signals.

The MAX13036 operates with a +6V to +26V battery voltage
applied to BAT. A separate +2.7V to +5.5V logic supply
input (VL) sets the interface voltage.

The MAX13036 operates with a +6V to +26V battery voltage
applied to BAT. A separate +2.7V to +5.5V logic supply
input (VL) sets the interface voltage.

Or are you saying that no matter the voltage of the signal is 26v or 5v i can still connect it to the arduino?

Four of the
switch inputs are intended for ground-connected switches
(IN0–IN3), and the other four inputs (IN4–IN7), are
programmable in groups of two for either ground-connected
or battery-connected switches. Two switch inputs
(IN0, IN1) have direct level-shifted outputs (DO0, DO1)
to be used for PWM or other timing-based signals.

The chip can operate at 26V
Switch input thresholds are set to 50% of the voltage applied to BATREF. By threshold I would assume
that means the distinction between HIGH or LOW. If you look at the INPUT IMPEDANCE of the switch inputs it's in the MEGAOHMS so I don't think you need to worry about applying a 26V signal to a switch input, however ALL of the LOGIC LEVEL (uP interface) signals are set by the VL pin.

WETTING CURRENT

And im gonna use NRF24L01 Wireless Shield SPI to I2C Interface to wirelessly connect the RFID reader and arduino

How ?

How?

like in the link below

So you decided not to use the other chip (MAX13036) ?

http://www.lawicel-shop.se/prod/Logic-Level-Shifter-4ch-Bidir_1056012/Pololu_55653/SWE/SEK/

can I be using this as a level shifter all thought the HV is up to 18v only?

And just to be clear. you are saying that I can just directly connect the device to my arduino or nrf24l01 shield without any problem?

raschemmel:
So you decided not to use the other chip (MAX13036) ?

As you are saying I will not becouse it won't be helping me if it doesn't support the I2C

And just to be clear. you are saying that I can just directly connect the device to my arduino or nrf24l01 shield without any problem?

The NRF24L01 should be powered by the 3.3V power pin on arduino.

NRF24L01 also uses SPI interface.
It's IO are 5V tolerant, but its power line must be 3.3 to 3.6V. NOT 5V.

http://www.lawicel-shop.se/prod/Logic-Level-Shifter-4ch-Bidir_1056012/Pololu_55653/SWE/SEK/

can I be using this as a level shifter all thought the HV is up to 18v only?

If you are asking me if you can EXCEED (greater than) the 18V MAXIMUM voltage for that device, then NO
of course not. If it says the maximum is 18V , then you obviously cannot use 26V or anything else >18V.
You should not even ask that question.

And im gonna use NRF24L01 Wireless Shield SPI to I2C Interface to wirelessly connect the RFID reader and arduino

I still don't understand how the NRF24L01 can function as a SPI to I2C Interface is supposed to work because the link you posted for that is not a vendor link so I can't read any datasheet information about those radios. I don't know any NRF24L01s that use I2C as shown in that link. They use SPI as pointed out
by CROSSROADS. Until I see a vendor link for one that uses I2C , as far I am concerned, they don't exist.
Maybe they do, but the link you posted is not proof of that. It's just a schematic, not a vendor website and it doesn't apply to all the NRF24L01s referred to all over the internet and the forum. Post the vendor
link to buy the i2c version.