⚠️
Hi there.. thanks for coming to the forums. Exciting news! we’re now in the process of moving to our new forum platform that will offer better functionality and is contained within the main Dialog website. All posts and accounts have been migrated. We’re now accepting traffic on the new forum only - please POST any new threads at https://www.dialog-semiconductor.com/support . We’ll be fixing bugs / optimising the searching and tagging over the coming days.
11 posts / 0 new
Last post
BenjaminDu
Offline
Last seen: 8 months 3 weeks ago
Joined: 2016-03-14 02:38
Power management

Hi Dialog,

My application is a DA14583 with a sensor, the sensor needs 3.3V and 10mA power supply  .

To save energy, I want the sensor can be powered off and powered on while the DA14583 is in connected state. namely, when DA14583 is connected, if I want the sensor to work, then I power it, if I don't want it to work, I power it off.

My question:

If the power supply is 3V for DA14583, can it control and supply the power of the sensor with 3.3V and 10mA while DA14583 is connected?

Thanks 

Benjamin.

 

Device: 
PM_Dialog
Offline
Last seen: 15 hours 11 min ago
Staff
Joined: 2018-02-08 11:03
Hi BenjaminDu,

Hi BenjaminDu,

I guess that you are interested in using any of the available sleep modes in order to reduce the power consumption. Keep in mind that when the device is in sleep mode, all the peripheral domain including UART, SPI, I2C etc. are powered down. For instance, if I is an I2C sensor, it’s possible to perform an I2C activity when the chip is in sleep mode. Additionally, keep in mind that the system can go into sleep between advertising or connection interval. As far as I understand, you would like to set the sensor into power down mode in all cases except from the device is connected. This is something you should refer to the sensor datasheet and send the appropriate “power down ” command in order to put it into low power mode and reduce the current consumption.

Thanks, PM_Dialog

BenjaminDu
Offline
Last seen: 8 months 3 weeks ago
Joined: 2016-03-14 02:38
Hi Dialog,

Hi Dialog,

Thanks a lot for your quick answer.

Unforturnlly my sensor doesn't have a power down mode.

Now there seems no good solution.

My solution is to have a 3V battery to power DA14580.

and then a transistor as a switch controlled by DA14580

then a boost curcuit to change the voltage to 3.3V to power the sensor.

Do you think there could be better approach?

Thanks 

Benjamin June 1st. 

PM_Dialog
Offline
Last seen: 15 hours 11 min ago
Staff
Joined: 2018-02-08 11:03
Hi BenjaminDu,

Hi BenjaminDu,

Since the sensor does not include a power down command, this might be the best solution to reduce the overall power consumption.

Thanks, PM_Dialog

BenjaminDu
Offline
Last seen: 8 months 3 weeks ago
Joined: 2016-03-14 02:38
Hi dialog,

Hi dialog,

Any pin can provide 3.3V and 10mA power when in wakeup mode?(my battery is 3V).

Thanks Benjamin

 

BenjaminDu
Offline
Last seen: 8 months 3 weeks ago
Joined: 2016-03-14 02:38
Hi dialog,

Hi dialog,

Any pin can provide 3.3V and 10mA power when in wakeup mode?(my battery is 3V).

Thanks Benjamin

 

PM_Dialog
Offline
Last seen: 15 hours 11 min ago
Staff
Joined: 2018-02-08 11:03
Hi BenjaminDu,

Hi BenjaminDu,

Please see datasheet : The voltage between pin and gnd in 0V -  min(3.3,VBAT_RF+0.2).

Thanks, PM_Dialog

BenjaminDu
Offline
Last seen: 8 months 3 weeks ago
Joined: 2016-03-14 02:38
Hi dialog,

Hi dialog,

Thanks a lot for your help.

So if my battery is 3V, then the voltage is 3.2V? and can any pin provide 10mA power?

Thanks a lot

Benjamin

 

 

PM_Dialog
Offline
Last seen: 15 hours 11 min ago
Staff
Joined: 2018-02-08 11:03
Hi Benjamin,

Hi Benjamin,

Are you using buck or boost mode? Can you please share the DA1458x schematic?

Thanks, PM_Dialog

BenjaminDu
Offline
Last seen: 8 months 3 weeks ago
Joined: 2016-03-14 02:38
Hi dialoa,

Hi dialoa,

I'm using buck mode,please find my circuit as attached. can any pin   provide 10mA power?

Thanks Benjam

Attachment: 
PM_Dialog
Offline
Last seen: 15 hours 11 min ago
Staff
Joined: 2018-02-08 11:03
Hi Benjamin,

Hi Benjamin,

Please refer to datasheet and table Table 267: Digital Input/Output: DC Characteristics.

Thanks, PM_Dialog