MB90F347CE datasheet(71/85 Pages) FUJITSU

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MB90340E Series

Notes on A/D Converter Section

Use the device with external circuits of the following output impedance for analog inputs :

Recommended output impedance of external circuits are : Approx. 1.5 k

Ω or lower (4.0 V ≤ AVCC ≤ 5.5 V,

sampling period

= 0.5 µs)

If an external capacitor is used, in consideration of the capacitive voltage dividing effect between the external

capacitor and the internal on-chip capacitor, it is recommended that the capacitance of the external capacitor

be several thousand times greater than the capacitance of the internal capacitor.

If the output impedance of the external circuit is too high, a sampling period for an analog voltage may be

insufficient.

Flash Memory Program/Erase Characteristics

* : This value was converted from the results of evaluating the reliability of the technology (using Arrhenius equation

to translate high temperature measurements into normalized value at

+85 °C) .

Parameter

Conditions

Value

Unit

Remarks

Min

Typ

Max

Sector erase time

= +25 °C

VCC

= 5.0 V

⎯

115

Excludes programming

prior to erasure

Chip erase time

⎯

Excludes programming

prior to erasure

Word (16-bit width)

programming time

⎯

3600

µs

Except for the over head

time of the system

Program/Erase cycle

⎯

10000

⎯⎯

cycle

Flash Data Retention

Time

Average

= +85 °C

⎯⎯

year

Comparator

Analog input

4.5 V

≤ AVCC ≤ 5.5 V : R := 2.52 kΩ, C := 10.7 pF

4.0 V

≤ AVCC < 4.5 V : R := 13.6 kΩ, C := 10.7 pF

• Analog input circuit model

Note : Use the values in the figure only as a guideline.

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