Home/rtc

Tag: rtc

Questions regarding Real Time Clocks (RTCs) which can be a timekeeper IC used by microcontrollers, or using a microcontroller as an accurate timekeeper. Some have calendar, alarm, interrupt or heartbe…

volt.tech Latest Questions

vikas Nagpal
  • 0
vikas Nagpal
Asked: October 26, 2022In:
  • 0

Hello, I notice the supply for the RTC is also connected to the general 3V3 supply on the schematic for the ESP32- C3-MINI-1-H4 module. If I supply3.3 V power to the ESP32- C3-MINI-1-H4 but have the enable line low, so chip ...Read more

Hello, I notice the supply for the RTC is also connected to the general 3V3 supply on the schematic for the ESP32- C3-MINI-1-H4 module.

If I supply3.3 V power to the ESP32- C3-MINI-1-H4 but have the enable line low, so chip impaired, will the RTC keep on running if it has been set before?

Or for the RTC to remain running but the chip powered down will I need to produce my own layout to break out the RTC 3V3 pin and thus I won’t be suitable to use the ESP32- C3-MINI-1-H4 module?

Thanks

Read less
chipesp32esp32c3mini1externalpowermodulertc
  1. ashishgawade

    Neither. The ESP32-C3 needs to have all 3.3 V power pins powered at the same time, it's not possible to power the RTC domain independently. Disabling the chip using EN will shut down the wholeness of the chip, including the RTC. To make use of the RTC in low-power mode, you need to use software to pRead more

    Neither. The ESP32-C3 needs to have all 3.3 V power pins powered at the same time, it’s not possible to power the RTC domain independently. Disabling the chip using EN will shut down the wholeness of the chip, including the RTC. To make use of the RTC in low-power mode, you need to use software to put the chip into a deep sleep.

    See less
    • 0
nidhi singh
  • 0
nidhi singh
Asked: September 9, 2022In:
  • 0

Hi, I’m using Renesas RA6M2 MCU. I’m facing following problems related to internal RTC.1. After RTC set at morning 9 am and device put in off state. At 6 pm when we going to check RTC it shows 1 hr ...Read more

Hi,

I’m using Renesas RA6M2 MCU. I’m facing following problems related to internal RTC.
1. After RTC set at morning 9 am and device put in off state. At 6 pm when we going to check RTC it shows 1 hr delay.
2. Is it need to call RTC open api at every power ON?
3. I’m using FSP3.7. In that clock source not set in rtc open api. For break this issue, I set RTC clock source after rtc open api. But After callingR_RTC_ClockSourceSet( &g_rtc_ctrl) api, I observedR_RTC->RCR2_b. launch bit is 0. In this case RTC not running.

Read less
mcura6m2renesasRenesas Microcontrollerrtc
  1. vikas Nagpal

    1. RTC time lag not exactly 1 hr. Some times it was 45 min ,15 min in 9hrs. Time lag mostly occurs in OFF state(Battery is connected). 2. In case of warm start or a hard reset (when VBATT powers RTC in case of power loss), is it need reinitialize RTC clock source? 3. When VBATT powers RTC in case ofRead more

    1. RTC time lag not exactly 1 hr. Some times it was 45 min ,15 min in 9hrs. Time lag mostly occurs in OFF state(Battery is connected).

    2. In case of warm start or a hard reset (when VBATT powers RTC in case of power loss), is it need reinitialize RTC clock source?

    3. When VBATT powers RTC in case of power loss then what is the initialization sequence of RTC after warm start or a hard reset.

    See less
    • 0
vikas Nagpal
  • 0
vikas Nagpal
Asked: July 26, 2022In:
  • 0

In the Espressif ESP32 has a RTC but where is its VBATT supply pin when the main VDD fails?

In the Espressif ESP32 has a RTC but where is its VBATT supply pin when the main VDD fails?
Read less
battery supplyesp32rtcVBATTVDD
  1. Rutuja

    You can connect both battery and main supply to the RTC via a couple of diodes (or a more complex switching circuit).

    You can connect both battery and main supply to the RTC via a couple of diodes (or a more complex switching circuit).

    See less
    • 0
vsharma
  • 0
vsharma
Asked: May 12, 2022In:
  • 0

We have considered D1M1-A for one of our PV projects. Have few queries regarding same.Is D1M1-A is capable to drive TFT on LVDS interface? Does it recommended to use internal RTC to achieve ±1 Sec per day clock ...Read more

We have considered D1M1-A for one of our PV projects.

Have few queries regarding same.

  1. Is D1M1-A is capable to drive TFT on LVDS interface?
  2. Does it recommended to use internal RTC to achieve ±1 Sec per day clock accuracy?

Read less

Clock accuracyD1M1-ALVDSrtcTFT