hello, our car key has been used for 8 years and it still works. Why is the standby power consumption so low? Generally speaking, if the standby current is 1 or 2uA, it can be used for 2 or 3 years. What kind of MCU is used in the car key to achieve such a low sleep current? Don't you use MCU?...

Can you give more information on which key we are talking about? Keys from different cars use different MCUs. In the case of the key from the Passat B5 FL, I have an embedded M44C890E from ATMEL (sleep mode consumption is

It's the best method as this key doesn't need to do anything in the background. The MCU with such a simple application starts up practically immediately (at least from a human point of view). To this it is worth to add a Push button on/off controller such as e.g. MAX161xx . Some of them even draw < 10nA

>>21080823 .Contemporary is not the most significant differentiator here.The PIC24F16KA101 (almost 20 years old) had sleep modes where it drew typically 10 nA.I have a wireless roundel temperature sensor made on it + TMP102 + RFM75,It has been running since 2016 on a single 2/3A lithium battery sending a data packet every minute.I don't know what condition the battery is in, but it continues to work.

What microcontroller is used in the car key? Why is the power consumption so low?

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#1 21080252 13 May 2024 08:28

qeetam qeetam

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Post #1
21080252 13 May 2024 08:28

hello, our car key has been used for 8 years and it still works. Why is the standby power consumption so low? Generally speaking, if the standby current is 1 or 2uA, it can be used for 2 or 3 years. What kind of MCU is used in the car key to achieve such a low sleep current? Don't you use MCU? Or press the switch to turn on the power? I just want to make a wireless remote control that is similar to a car key. Can anyone recommend what chip to use?
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#2 21080749 13 May 2024 14:13

mati12_14 mati12_14

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Post #2
21080749 13 May 2024 14:13

Can you give more information on which key we are talking about? Keys from different cars use different MCUs. In the case of the key from the Passat B5 FL, I have an embedded M44C890E from ATMEL (sleep mode consumption is <1uA)
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#3 21080823 13 May 2024 14:51

tmf tmf

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Post #3
21080823 13 May 2024 14:51

Modern MCUs draw <<400nA in sleep mode. And the easiest way is to just physically disconnect them, then they only draw current when you press a button.
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#4 21081417 13 May 2024 22:04

oscil1 oscil1

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21081417 13 May 2024 22:04

tmf wrote:
Modern MCUs draw <<400nA in sleep mode. And the easiest way is to just physically disconnect them, then they only draw current when you press the key.

It's the best method as this key doesn't need to do anything in the "background". The MCU with such a simple application starts up practically immediately (at least from a human point of view).

To this it is worth to add a "Push button on/off controller" such as e.g. MAX161xx . Some of them even draw < 10nA
#5 21110011 06 Jun 2024 20:56

abant abant

Level 12

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Post #5
21110011 06 Jun 2024 20:56

>>21080823 .
Contemporary is not the most significant differentiator here.
The PIC24F16KA101 (almost 20 years old) had sleep modes where it drew typically 10 nA.
I have a wireless roundel temperature sensor made on it + TMP102 + RFM75,
It has been running since 2016 on a single 2/3A lithium battery sending a data packet every minute.
I don't know what condition the battery is in, but it continues to work.
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