shutdown RFX2411N PA/LNA module

RE: shutdown RFX2411N PA/LNA module

Stas — Sun, 26 Feb 2017 17:47:29 GMT

BIPIN. What's range distance did you get using this amplifier. Could you share the schematic?

RE: shutdown RFX2411N PA/LNA module

Wojtek — Tue, 05 Jul 2016 13:22:18 GMT

great, glad to help :]

RE: shutdown RFX2411N PA/LNA module

BIPIN — Tue, 05 Jul 2016 13:20:32 GMT

Wojtek, you are right. If i stop advertisement(no transmission) then TXEN and RXEN line sets low automatically by softdevice. Now my all query resolve.

Thanks a lot..

RE: shutdown RFX2411N PA/LNA module

Wojtek — Tue, 05 Jul 2016 12:58:54 GMT

So if you don't want to use BLE, so you are not scanning, advertising, connected etc, those TXEN and RXEN pins won't be driven. They should be (and i believe that nordic engineers implemented it like that - have not checked myself) activated only when transmission/reception is in progress. You are observing change of the states on these pins when BLE is NOT used? if yes, that is some major bug up there. But if you want to control transmission/reception only by enabling/disabling PA/LNA, that is not a proper way to save power...

RE: shutdown RFX2411N PA/LNA module

BIPIN — Tue, 05 Jul 2016 12:46:06 GMT

Actually When my device goes to battery power mode, I plan to shutdown PA module so no tx/rx. When mains power available, i want to start rx/tx again by enabling PA module again. Thats whay i want control of TXEN and RXEN pin.

RE: shutdown RFX2411N PA/LNA module

Wojtek — Tue, 05 Jul 2016 12:34:30 GMT

Yes, i understand, but what i can't understand is why you want to use module with physically disconnected antenna? Is it really what you want to achieve? shutdown module = disconnect antenna circuitry = very poor range. If you really want to do this, i would try disabling softdevice and enabling it again with no set opts afterwards.

RE: shutdown RFX2411N PA/LNA module

BIPIN — Tue, 05 Jul 2016 12:31:25 GMT

Thanks Wojtek, But for shutdown PA Module, I have to set TXEN,RXEN and MODE pin to low. I can set MODE pin to low but I can't set TXEN and RXEN pin to low as they are controlled by softdevice.

RE: shutdown RFX2411N PA/LNA module

Wojtek — Tue, 05 Jul 2016 12:21:03 GMT

I am not 100% sure but i think that when bypass is activated, TXEN/RXEN are like disconnected, so no there is no current flow. So you don't have to worry about that the pin levels are changing... there is only current eaten by module anyway - to save current you have to physically disconnect it from nRF (so like shutdown, you disconnect your antenna). according to datasheet, it is about 0.6mA. And driving/not driving RXEN/TXEN have no influcence on that...

RE: shutdown RFX2411N PA/LNA module

BIPIN — Tue, 05 Jul 2016 12:17:57 GMT

If i activate BYPASS pin then still i can see hi-low signal on TXEN and RXEN pin because my softdevice doesn't know i have enabled bypass mode. so I just want to save power by setting those pins to low when bypass enable.

RE: shutdown RFX2411N PA/LNA module

Wojtek — Tue, 05 Jul 2016 12:12:49 GMT

I would try disabling softdevice... But i see no point of manually controlling these pins unless you are doing proprietary transmission and want to control them manually. If you just want to transmit without current draw of PA and receive without current draw of LNA - just activate BYPASS pin.

RE: shutdown RFX2411N PA/LNA module

BIPIN — Tue, 05 Jul 2016 12:10:20 GMT

Wojtek,

I got your point now. In shutdown mode i can't access antenna and so can't do tx/rx. Thanks for that.

But I want to know that how can i get control of GPIO pins back that i have used to control tx and rx on PA/LNA module?

RE: shutdown RFX2411N PA/LNA module

Wojtek — Tue, 05 Jul 2016 11:57:26 GMT

I think that is exactly what bypass mode is for. When using bypass, you are still connected to your antenna (when shutdown, it is like you physically disconnect antenna), but PA/LNA is not used.

RE: shutdown RFX2411N PA/LNA module

BIPIN — Tue, 05 Jul 2016 11:56:32 GMT

Wojtek,

Normally my application work on mains power but when mains power off it shifted to battery power. At that time i plan to shutdown PA module to save power.

means I want to transmit/receive with PA/LNA shut down.

-Bipin

RE: shutdown RFX2411N PA/LNA module

Wojtek — Tue, 05 Jul 2016 09:00:42 GMT

I think this module is automatically driven shutdown when not receiving nor transmitting (you can check logic levels on the nrf pins, but i am almost sure) - why you want to explicitly shutdown it? You want to transmit/receive without bypass and with PA/LNA shut down?