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| RV-8523 Datasheet, PDF (25/57 Pages) MICORO CRYSTAL SWITZERLAND – Real Time Clock | |||
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Micro Crystal
Real Time Clock / Calendar Module
RV-8523
Direct switching mode:
If VDD > VBAT the internal power supply is VDD.
If VDD < VBAT the internal power supply is VBAT.
The direct switching mode is useful in systems where VDD is higher than VBAT at all times (for example VDD = 5 V,
VBAT = 3.5 V). If VDD and VBAT values are similar (for example VDD = 3.3 V, VBAT ⥠3.0 V), the direct switching mode
is not recommended. In direct switching mode, the power consumption is reduced compared to the standard mode
because the monitoring of VDD and Vth(sw)bat is not performed.
Battery switchover behavior in direct switching mode and with bit BSIE set logic 1 (enabled):
Battery switchover disabled, only one power supply (VDD):
When the battery switchover function is disabled:
⢠The power supply is applied on VDD pin
⢠VBAT pin must be connected to ground
⢠The battery flag (BSF) is always logic 0
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