Changes between Version 95 and Version 96 of gsc


Ignore:
Timestamp:
02/04/2022 06:32:54 PM (8 months ago)
Author:
Ryan Erbstoesser
Comment:

update more info for new battery

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  • gsc

    v95 v96  
    14171417The coin cell battery used provides power for the GSC to run while board power is removed (or in some cases when the GSC has removed the board's primary power via GSC sleep).
    14181418
    1419 Newer Gateworks SBCs are now starting to use a rechargeable battery.
     1419There are 2 different batteries Gateworks uses by default.
     1420 * New rechargeable (Venice and onwards) coincell
     1421 * Standard non-rechargeable coincell
     1422
     1423==== New Rechargeable Battery
     1424
     1425Newer Gateworks SBCs (Venice and onwards) are now starting to use a rechargeable battery.
    14201426For which models support this, please see the SBC revisions wiki page: [wiki:sbcrevisions]
    14211427
    14221428The new rechargeable battery is defined as a 3.3V Lithium Rechargeable coin-cell battery, 6.8mm in size and 3mAH. The recommended battery is a Seiko Instruments MS621T [https://www.digikey.com/en/products/detail/seiko-instruments/MS621T/6137712 Digi-Key 728-1078-ND]
    14231429
     1430At room temp the 3mAH rechargeable lithium will take approximately 96 hours or 4 days to charge and will provide backup power for around 79.5 days.
     1431
     1432==== Older - Non-Rechargeable Battery
    14241433
    14251434The shelf life of the battery defines how long the GSC retains power and thus its settings such as the RTC when board power is removed and depends on the version of the GSC:
     
    14271436 * GSCv1/GSCv2 (Ventana / Laguna): approximately 3.8 years
    14281437
    1429 
    1430 == Battery Replacement
    1431 
    1432 Battery Replacement Details:
    1433  * A BR1225 coin cell battery is used. (older models)
    1434   * Newer models use a Seiko Instruments MS621T [https://www.digikey.com/en/products/detail/seiko-instruments/MS621T/6137712 Digi-Key 728-1078-ND] (described above)
     1438A BR1225 coin cell battery is used.
     1439
     1440 * The BR1225 coin cell is rated at 50mA/hours. Battery lifetime can be calculated by taking the battery rating divided by the current drain. The GSC's typical drain depends on the version:
     1441  - v1/v2 (!Laguna/Ventana): ~1.5uA: (50mA/hour)/(1.5uA) = 33.33K hours = 1388 days = 3.8 years
     1442  - v3 (Newport): ~1.0uA: (50mA/hour)/(1.0uA) = 50K hours = 2083.3 days = 5.7 years
     1443
     1444
     1445==== General Battery Notes
     1446
     1447
    14351448 * While primary board power is removed, the GSC battery can be removed for about 10 seconds before power is lost to the GSC.  This gives you a small window of time to replace the battery without losing data such as RTC values. If longer then 10 seconds then the GSC will be reset.
    14361449 * !Laguna/Ventana ('''does not apply to Newport boards'''): If battery is replaced while board power is off, '''you must apply board power momentarily afterwards to reset the GSC into the proper operational state. If power is not applied the drain on the battery will be fairly large and will deplete the battery within about 3-4 weeks.'''.
     
    14391452 * The GSC can operate down to a battery voltage of 2.2V. If the battery goes below this voltatge the GSC can get into a brownout loop. To avoid this the battery should be either removed (operate without battery) or replaced.
    14401453 * A fresh battery typically has a voltage ranging from 2.8 to 3.1V (also depends on temperature). The battery discharge rate is fairly flat but once it is discharged it can decay rapidly. Note that when the board is powered, the 3.3V power supply supplies power to the GSC and the battery will not be drained. This should be factored in when determining battery lifetime.
    1441  * The BR1225 coin cell is rated at 50mA/hours. Battery lifetime can be calculated by taking the battery rating divided by the current drain. The GSC's typical drain depends on the version:
    1442   - v1/v2 (!Laguna/Ventana): ~1.5uA: (50mA/hour)/(1.5uA) = 33.33K hours = 1388 days = 3.8 years
    1443   - v3 (Newport): ~1.0uA: (50mA/hour)/(1.0uA) = 50K hours = 2083.3 days = 5.7 years
     1454
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