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7.6. Power supply monitoring function
This IC incorporates the power supply monitoring function.
7.6.1. VBAT undervoltage detection circuit
・When the VBAT voltage falls and becomes less than the low detection voltage, OUT1/2 becomes
"OFF"(High-Z state).
Moreover, in order to prevent chattering, a filter (TVBAT_uv:2μs (typ.)) is built in. If the VCC voltage is
more than the POR detecting voltage value of VCC undervoltage even when output is in the "OFF"
(High-Z) state by undervoltage detection of VBAT, a Logic circuit is able to operate.
Figure 7.6.1-1 Threshold characteristics of VBAT undervoltage detection
Note: Some of timing charts in this document may be omitted or simplified for explanatory purposes.
Figure 7.6.1-2 Timing chart of VBAT undervoltage detection
Note: Some of timing charts in this document may be omitted or simplified for explanatory purposes.
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TB9051FTG
Ver.1.1 2019-03-14
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