Difference between revisions of "AXEL Lite SOM/AXEL Lite Hardware/Peripherals/Real Time Clock"
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<section end=History/> | <section end=History/> | ||
| + | __FORCETOC__ | ||
<section begin=Body/> | <section begin=Body/> | ||
==Peripheral Real Time Clock == | ==Peripheral Real Time Clock == | ||
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=== Description === | === Description === | ||
| − | The Real Time Clock interface available on AXEL Lite is based on | + | The Real Time Clock interface available on AXEL Lite is based on NXP MMPF0100 PMIC. |
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| + | The Real Time Clock is kept operative through the AXEL Lite PMIC_LICELL pin (J2.14): the LICELL pin provides for a connection of a coin cell backup battery or a “super” capacitor. | ||
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| + | A small capacitor should be placed from LICELL to ground under all circumstances. | ||
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| + | For more information about PMIC RTC functionality, please refer to the [https://www.nxp.com/docs/en/data-sheet/MMPF0100.pdf MMPF0100] datasheet. | ||
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| + | ===Powering=== | ||
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| + | Real-time clock is integrated in iMX6 processor. As such, it belongs to SNVS power domain. This domain, in turn, is powered by PMIC, via PMIC_VSNSV rail (see also [[AXEL Lite SOM/AXEL Lite Hardware/Power and Reset/Power Supply Unit (PSU) and recommended power-up sequence|this page]]). PMIC integrates a sort of switch. When 3V3VIN voltage is applied, this is used to power SNVS domain. Otherwise energy is drawn from coin cell battery - if any - connected to PMIC_LICELL (for more details please refer to <ref name="MMPF0100">NXP, ''MMPF0100 - PF0100 Data sheet: Advance Information''</ref>). | ||
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| + | [[File:Axellite-rtc.png|thumb|center|600px|Simplified block diagram of AXEL Lite RTC powering scheme]] | ||
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| − | + | It is worth remembering that 3.0V lithium batteries are supported and that PMIC_VSNSV voltage range is 2.4 - 3.6V. When [[FAQs_(Axel)#Q:_How_to_enter_RTC_mode.3F|AXEL Lite enters RTC mode]] and 3V3VIN voltage is removed, typical current absorption from PMIC_LICELL pin is about 135uA. This value is '''relatively high''' with respect to the typical lithium coin cell battery capacity (10 - 50mAh). It is recommended that system integrator verify that expected battery lifetime satisfies system requirement. If not, the use of an external low-power RTC device should be considered. | |
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===Pin mapping=== | ===Pin mapping=== | ||
Revision as of 13:54, 23 July 2021
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| 1.0.0 | Oct 2020 | New documentation layout | |
Peripheral Real Time Clock[edit | edit source]
Description[edit | edit source]
The Real Time Clock interface available on AXEL Lite is based on NXP MMPF0100 PMIC.
The Real Time Clock is kept operative through the AXEL Lite PMIC_LICELL pin (J2.14): the LICELL pin provides for a connection of a coin cell backup battery or a “super” capacitor.
A small capacitor should be placed from LICELL to ground under all circumstances.
For more information about PMIC RTC functionality, please refer to the MMPF0100 datasheet.
Powering[edit | edit source]
Real-time clock is integrated in iMX6 processor. As such, it belongs to SNVS power domain. This domain, in turn, is powered by PMIC, via PMIC_VSNSV rail (see also this page). PMIC integrates a sort of switch. When 3V3VIN voltage is applied, this is used to power SNVS domain. Otherwise energy is drawn from coin cell battery - if any - connected to PMIC_LICELL (for more details please refer to [1]).
It is worth remembering that 3.0V lithium batteries are supported and that PMIC_VSNSV voltage range is 2.4 - 3.6V. When AXEL Lite enters RTC mode and 3V3VIN voltage is removed, typical current absorption from PMIC_LICELL pin is about 135uA. This value is relatively high with respect to the typical lithium coin cell battery capacity (10 - 50mAh). It is recommended that system integrator verify that expected battery lifetime satisfies system requirement. If not, the use of an external low-power RTC device should be considered.
Pin mapping[edit | edit source]
The Pin mapping is described in the Pinout table section
- ↑ NXP, MMPF0100 - PF0100 Data sheet: Advance Information
