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參數(shù)資料
| 型號： | MB90F997MBSPMC |
| 廠商： | FUJITSU LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 32 MHz, MICROCONTROLLER, PQFP48 |
| 封裝： | 7 X 7 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, PLASTIC, LQFP-48 |
| 文件頁數(shù)： | 8/68頁 |
| 文件大?。?/td> | 1869K |
| 代理商： | MB90F997MBSPMC |
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MB90990 Series
16
DS07-13753-3E
As a measure against power supply noise, connect a capacitor of about 0.1
μF as a bypass capacitor between
VCC pin and VSS pin in the vicinity of VCC and VSS pins of the device.
Pull-up/down resistors
The MB90990 series does not support internal pull-up/down resistors (Port 2 : built-in pull-up resistors) . Use
external components where needed.
Crystal oscillator circuit
Noises around X0 or X1 pins may be possible causes of malfunctions. Make sure to provide bypass capacitors
via shortest distance from X0, X1 pins, crystal oscillator (or ceramic resonator) and ground lines, and make sure,
that lines of oscillation circuit do not cross the lines of other circuits.
It is highly recommended to provide a printed circuit board artwork surrounding X0 and X1 pins with a ground
area for stabilizing the operation. Please ask the crystal maker to evaluate the oscillational characteristics of the
crystal and this device.
Turning-on sequence of power supply to A/D converter and analog inputs
Make sure to turn on the A/D converter power supply (AVCC and AVR) and analog inputs (AN0 to AN15) after
turning-on the digital power supply (VCC) .
Turn-off the digital power after turning off the A/D converter power supply and analog inputs. In this case, make
sure that the voltage does not exceed AVRH or AVCC.
Connection of unused pins of A/D converter if A/D converter is not used
Connect unused pins of A/D converter to AVCC
= VCC, AVSS = AVR = VSS.
Notes on energization
To prevent the internal regulator circuit from malfunctioning, set the voltage rise time during energization at
50
μs or more (0.2 V to 2.7 V) .
Stabilization of power supply voltage
A sudden change in the power supply voltage may cause the device to malfunction even within the specified
VCC power supply voltage operating guarantee range. Therefore, the VCC power supply voltage should be
stabilized.
For reference, the power supply voltage should be controlled so that VCC ripple variations (peak-to-peak value)
at commercial frequencies (50 Hz/60 Hz) fall below 10
% of the standard VCC power supply voltage and the
coefficient of transient fluctuation does not exceed 0.1 V/ms at instantaneous power switching.
VCC
VSS
MB90990
Series
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