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MB90378 Datasheet(PDF) 17 Page - Fujitsu Component Limited.

Part No. MB90378
Description  16-bit Proprietary Microcontroller
Download  65 Pages
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Maker  FUJITSU [Fujitsu Component Limited.]
Homepage  http://edevice.fujitsu.com/fmd/en/index.html
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MB90378 Datasheet(HTML) 17 Page - Fujitsu Component Limited.

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MB90378 Series
17
7.
Power supply pins
When a device has two or more VCC or VSS pins, the pins that should have equal potential are connected within
the device in order to prevent a latch-up or other malfunction. To reduce extraneous emission, to prevent a
malfunction of the strobe signal due to an increase in the group level, and to maintain the local output current
rating, connect all these power supply pins to an external power supply and ground them.
The current source should be connected to the VCC and VSS pins of the device with minimum impedance. It is
recommended that a bypass capacitor of about 0.1
µF be connected near the terminals between VCC and VSS.
8.
Analog power-on sequence of A/D converter and D/A converter
The power to the A/D converter and D/A converter (AVCC, AVR) and analog inputs (AN0 to AN11) must be turned
on after the power to the digital circuits (VCC) is turned on. When turning off the power, turn off the power to the
digital circuits (VCC) after turning off the power to the A/D converter, D/A converter and analog inputs. When the
power is turned on or off, AVR should not exceed AVCC. Also, when a pin that is used for A/D analog input is also
used as an input port, the input voltage should not exceed AVCC. (The power to the analog circuits and the power
to the digital circuits can be simultaneously turned on or off.)


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