HH power supply ICL7660 pinout question

[39cents]

Hi, I'm looking at the schematic for the HH PI, and the ICL7660 wiring diagram seems off compared to the datasheet. The schematic shows pin 2 as the output, but the datasheet shows pin 5 as output.

I've searched around and I can't find a datasheet for the ICL7660 which matches the schematic with output on pin 2.

Before I do something dumb, I just wanted to make sure I am seeing this correctly.

The schematic doesn't mention a brand of ICL7660... is it a different manufacturer with different pinout?

Thanks

[kt315]

Carl will tell. his truth.

[39cents]

I'm listening. I am here to learn.

[surfdetector]

Hi, I'm looking at the schematic for the HH PI, and the ICL7660 wiring diagram seems off compared to the datasheet. The schematic shows pin 2 as the output, but the datasheet shows pin 5 as output.

I've searched around and I can't find a datasheet for the ICL7660 which matches the schematic with output on pin 2.

Before I do something dumb, I just wanted to make sure I am seeing this correctly.

The schematic doesn't mention a brand of ICL7660... is it a different manufacturer with different pinout?

Thanks

Pin #2 is used because the 7660 is being used as a Voltage Doubler in conjunction with D1, D2 and the associated caps.

Cheers

[Qiaozhi]

Look at Figure 19 (attached).

[39cents]

Ahh ok! Thank you!

[surfdetector]

Ahh ok! Thank you!

You should keep in mind that the maximum voltage to supply this chip is 10.5V. You might be better served with using an LT1054 so you don't let out the proverbial "magic smoke"

[kt315]

You should keep in mind that the HH is sure working project and you do not need to doubt.
just do.

[Qiaozhi]

You should keep in mind that the maximum voltage to supply this chip is 10.5V. You might be better served with using an LT1054 so you don't let out the proverbial "magic smoke"

The ICL7660S has a maximum voltage rating of 12V, whereas the basic ICL7660 is 10.5V.
As you said though, the LT1054 is a better alternative with a maximum rating of 15V, and it's pin-compatible with the ICL7660 and ICL7660S.

[kt315]

magic smoke anyway will be. it is living inside the chips. just give free it out. oneday.

[39cents]

You should keep in mind that the HH is sure working project and you do not need to doubt.
just do.

I want to understand the design rather than just build it.

I will build a section at a time after I understand each part of the circuit.


Let the magic smoke be free

[39cents]

The ICL7660S has a maximum voltage rating of 12V, whereas the basic ICL7660 is 10.5V.
As you said though, the LT1054 is a better alternative with a maximum rating of 15V, and it's pin-compatible with the ICL7660 and ICL7660S.

Thank you both, I have the ICL7660S