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参数资料
| 型号： | MB90F823BPF |
| 厂商： | FUJITSU LTD |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, FLASH, 4 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 14 X 20 MM, 3.35 HEIGHT, 0.80 MM PITCH, PLASTIC, QFP-80 |
| 文件页数： | 7/56页 |
| 文件大小： | 1645K |
| 代理商： | MB90F823BPF |
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MB90820B Series
DS07-13751-2E
15
5.
Power supply pins (VCC/VSS)
If there are multiple VCC and VSS pins, from the point of view of device design, pins to be of the same potential
are connected the inside of the device to prevent such malfunctioning as latch up.
To reduce unnecessary radiation, prevent malfunctioning of the strobe signal due to the rise of ground level,
and observe the standard for total output current, be sure to connect the VCC and VSS pins to the power supply
and ground externally.
Connect VCC and VSS pins to the device from the current supply source at a low impedance.
As a measure against power supply noise, connect a capacitor of about 0.1
F as a bypass capacitor between
VCC and VSS pins in the vicinity of VCC and VSS pins of the device.
6.
Pull-up/pull-down resistors
The MB90820B series does not support internal pull-up/pull-down resistors option (Port 0 to Port 3 : built-in pull-
up resistors) . Use external components where needed.
7.
Crystal oscillator circuit
Noises around X0 or X1 pins may be possible causes of abnormal operations. Make sure to provide bypass
capacitors via shortest distance from X0, X1 pins, crystal oscillator (or ceramic oscillator) and ground lines, and
make sure, to the utmost effort, that lines of oscillation circuit do not cross the lines of other circuits while you
design a printed circuit board.
It is highly recommended to provide a printed circuit board art work surrounding X0 and X1 pins with a ground
area for stabilizing the operation.
8.
Turning-on sequence of power supply to A/D converter and D/A converter, and analog
inputs
Make sure to turn on the A/D converter power supply, D/A converter power supply (AVCC, AVRH, 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, D/A converter power supply, and
analog inputs. In this case, make sure that the voltage not exceed AVR or AVCC (turning on/off the analog and
digital power supplies simultaneously is acceptable).
9.
Pin connections when A/D converter and D/A converter are unused
When the A/D converter and D/A converter are not used, connect AVCC = VCC, AVSS = AVRH = AVRL = VSS.
VCC
VSS
MB90820B
Series
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