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4 posts / 0 new
Last post
Sat, 2018-01-20 08:14
#1
sr9213
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加入:2017-09-26 11:30
Smart Tag

Hi Dialog,

I have a few queries regarding the Proximity Tag reference design:
1) In revision C.1 of Smart Tag-2, the FET controlling the power to flash is removed. What is the reason for that? Doesn't this impact battery life as the flash will be always on leading to a quiescent current consumption.
2) In design, the buzzer used is AB1541. I couldn't find its datasheet. So how much loud can it get using this buzzer?

Thanks & Regards,
sr9213

Device:
DA14580
Mon, 2018-01-22 16:49
MT_dialog
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加入:2015-06-08 11:34
Hi sr9213,

Hi sr9213,

  1. Yes, removing the FET will reduce the battery lifetime (only by a little though about 0.3uA for the used flash), but the reason the FET is removed is because of the there were some problems with the flash used, since it would require an amount of delay from the moment the flash was powered and be accesible for read and write commands. So the flash was removed since would not save that much power and it would require extra handling.
  2. Regarding the buzzer, the datasheet doesn't indicates the sound level of the component, perhaps you should reach the manufacturer for this.

Thanks MT_dialog

Tue, 2018-01-23 10:38
sr9213
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Hi Dialog,

Hi Dialog,

1) Thanks for the reply, appreciate it.
2) The reason why I asked about the sound level because I tested the same buzzer(AB1541) with my 585 based custom board and the buzzer sound is very faint. It is hardly audible.
Is there any special configuration required to get decent audible sound. If not do you have any other buzzer in mind which consume less power but are audible?

Regards,
sr9213

Accepted answer
Tue, 2018-01-23 16:54
(Reply to #3)
MT_dialog
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Hi sr9213,

Hi sr9213,

Well, this buzzer is used on the Smart Tag reference design, i dont think that it requires any special configuration, you can check the code and see the configurations for the buzzer and how its driven by the software, in the Smart Tag the buzzer in driven by the inverted PWM's that timer0 generates, please check the configuration in the reference design. Regarding the additional buzzer, as far as i am aware only the Smart Tag uses a buzzer component, so this is what we have used.

Thanks MT_dialog

Accepted answer