MB90883SPF datasheet(21/75 Pages) FUJITSU

21 / 75 page

MB90880 Series

Power-on and power-off sequence of A/D converter and analog input

Turn on the A/D converters (AVCC, AVRH) and analog inputs (AN0 to AN19) after turning on the digital power

supply (VCC) .

During power-off, turn off the digital power supply (VCC) after turning off the A/D converters and analog inputs

(AN0 to AN19) .

In this case, make sure that AVRH does not exceed AVCC during the power-on/power-off procedure.

Also make sure that the input voltage does not exceed AVCC when a pin which is also used as an analog input

is used as an input port.

Handling power supply pins on A/D converter-mounted models

Make sure to achieve "AVCC

= AVRH = VCC" and "AVSS = VSS" in connecting the circuits, even when not using the

A/D converter function.

Note on power-up

To prevent the internal regulator from malfunctioning, maintain the voltage rise time at 50

µs (between 0.2V and

2.7V) or more during power-up.

10. Stabilization of power supply

Even when the VCC power supply voltage is within the specified operating range, it may still cause the device to

malfunction, if the power supply changes rapidly. For stabilization reference, it is recommended to control the

supply voltage so that VCC ripple variations (P-P values) at commercial frequencies (50/60 Hz) fall below 10

of the standard VCC supply voltage and the coefficient of fluctuation does not exceed 0.1 V/ms at instantaneous

power switching.

11. Writing to Flash memory

For serial writing to Flash memory, always make sure that the operating voltage VCC is between 3.13V and 3.6V.

For normal writing to Flash memory, always make sure that the operating voltage VCC is between 3.0V and 3.6V.

12. P90/CS0 pins

P90/CS0 pins output “L” during writing Flash serial. Do not input from external.

13. Note of MB90F883 (S) , MB90F884 (S)

• Maximum operating frequency is 25 MHz.

• The base timer cannot use P24/TIO0, P25/TIO1, P26/TIO2, and P27/TIO3 as input function.

• MB90F883(S) and MB90F884(S) do not contain the flash security feature and write-protect feature.

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