LOW VOLTAGE DETECTOR

S3F80JB

 

 

NOTES

1.When smart option bit is set “1”, operating frequency is selected 8MHz and LVD voltage level is 2.3V. On the other hand, when smart option bit is set “0”, operating frequency is selected 4MHz and LVD voltage level is 2.15V.

2.When smart option bit is set “1”, operating frequency is selected 8MHz and LVD_FLAG voltage level is 2.15V. On the other hand, when smart option bit is set “0”, operating frequency is selected 4MHz and LVD_FLAG voltage level is 1.9V.

3.A term of LVD is a symbol of parameter that means ‘Low Level Detect Voltage for Back-Up Mode’.

4.A term of LVD_FLAG is a symbol of parameter that means ‘Low Level Detect Voltage for Flag Indicator’.

5.In case of 8MHz operating frequency, the voltage gap between LVD and LVD_FLAG is 150mV. In case of 4MHz operating frequency, the voltage gap between LVD and LVD_ FLAG is 250mV.

IPOR/LVD Control Bit (smart option[7]@03FH)

STOP

Resistor String

LVD

Comparator (BackupMode /Reset)

Bias

VDIV

VDIV_Flag

VIN Comparator

 

LVDCON.0

 

(LVD Flag Bit)

 

 

 

 

 

VREF

Bias

BANDGAP

Figure 16-1. Low Voltage Detect (LVD) Block Diagram

16-2

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Samsung S3F80JB manual Resistor String