EV2400: Test Jig

Hi
What gauge are you working with. if you are to use the devices to control a relay, there are only four pins on each connector and each pin is labelled. That is all you need.
thanks
Onyx

Hi Onyx,
we are in a preliminary phase and therefore I have not decided the fuel gauge at the moment (maybe BQ34110, BQ78350 or BQ40Z50) and neither installed bqStudio at the moment on my PC; my focus now is to understand how to setup a test bench and all is needed. Could you be so kind to explain me how to select the pins (both for EV2400 and EV2300)? I imagine that these pins drive two mosfets each one connected to its own relay.

Thanks

Hi

There is nothing special about the connections. When you click the gpc cycle tab of the tool, it gives you instructions .

See below picture of the circuit for connection

thanks

Onyx

Onyx I want to use relè in order to avoid overheating problems of the mosfets with charge/discharge currents of few amps...In this case, can I put directly the coil of the relè to the output of the EV2300 or EV2400? It shall sink about 40mA for a 200mW coil...
I have some doubt about the driving force of a 5V coil by the HDQ signal that is pulled up to +3,3V by 10k resistor... unless the the coil relè shall be driven by the MOSFET in your picture. In the latter case, do the EV2300 or EV2400 provide also the power supply for the coil of the relè?

Lastly, do the output signals of the EV2300 or EV2400 are compatible with relè Form 1A - NO or it better to use Form 1B-NC or even better Form 1C relè in order to have both contacts available in outputs and select the right ones during tests?

Thanks again
Luigi

hi Luigi,

The vout of ev2300 is just a low voltage source. I am not certain of it's current sinking capabitlity. There are fets with low vgs that can handle several amps. I would recommend you use one of such with a heat sink instead of the relay. The current sink capabiity of the vout pin of the ev2300 wasn't characterized.

thanks
Onyx

Hi Onyx,

it was you that wrote "Use N_CH FET with low Vgs OR small 5V-coil relay";  I agree with you now that EV2300 or EV2400 can't directly drive a coil relay because of their limited current source capability.

For this reason I would like to use the following schematic:

In order to work as aspected this circuit still needs:

1. Do the EV2300 or EV2400 provide also the power supply for relè coil (VCC)? Or shall I use a separated Power Supply to provide the 5V needed by the relè coil?
2. What kind of contact arrangement is requested to have by relè in order to correctly be driven by the EV2300 or EV2400 output signals? Form 1A - NO or it better to use Form 1B-NC or even better Form 1C?
3. In order to manage up to 10A of charge/discharge I think it's more effective to use relè instead of MOSFETs (that remain a viable solution for charge/discharge current of less Amps).

Please provide all your suggestions for the proposed circuit.

Thanks