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參數(shù)資料
| 型號： | MB90F927PF-GE1 |
| 廠商： | FUJITSU LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-bit Microcontrolle |
| 中文描述： | 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 20 MM, 3.35 MM HEIGHT, 0.65 MM PITCH, PLASTIC, QFP-100 |
| 文件頁數(shù)： | 15/63頁 |
| 文件大?。?/td> | 941K |
| 代理商： | MB90F927PF-GE1 |
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MB90925 Series
15
Power supply pins
Devices are designed to prevent problems such as latch-up when multiple V
CC
and V
SS
pins are used, by providing
internal connections between pins having the same potential. However, in order to reduce unwanted radiation,
to prevent abnormal operation of strobe signals due to rise in ground level, and to maintain total output current
ratings, all V
CC
and V
SS
pins should always be connected externally to power supplies and ground respectively.
As shown in the figure below, all V
CC
pins must have the same potential and all V
SS
pins must be at the same
potential. If there are multiple V
CC
or V
SS
systems, the device will not operate properly even within the warranted
operating range.
In addition, care must be given to connecting the V
CC
and V
SS
pins of this device to the current supply source
with as low impedance as possible. It is recommended that a 1.0
μ
F bypass capacitor be connected between
the V
CC
and V
SS
pins as close to the pins as possible.
Turning-on sequence of power supply to A/D converter and analog inputs
The A/D converter power supply (AV
CC
, AVRH) and analog inputs (AN0 to AN7) must be applied after the digital
power supply (V
CC
) is switched on. When power is shut off, the A/D converter power supply and analog inputs
must be cut off before the digital power supply is switched off (V
CC
) . In both power-on and power-off, care should
be taken that AVRH does not exceed AV
CC
. Even when pins which double as analog input pins are used as input
ports, be sure that the input voltage does not exceed AV
CC
.
Handling the power supply for high-current output buffer pins (DV
CC
, DV
SS
)
Always apply power supply to high-current output buffer pins (DV
CC
, DV
SS
) after the digital power supply (V
CC
) is
turned on. Also when switching the power off, always shut off the power supply to the high-current output buffer
pins (DV
CC
, DV
SS
) before switching off the digital power supply (V
CC
) . There is no problem if the high-current
output buffer pins and digital power supplies are turned off and on at the same time.
Even when the high-current output buffer pins are used as general-purpose ports, the power supply for high
current output buffer pins (DV
CC
, DV
SS
) should be applied to these pins.
Pull-up/pull-down resistor
MB90925 series does not support internal pull-up/pull-down resistor. If necessary, use external components.
V
CC
V
SS
V
CC
V
CC
V
CC
V
CC
V
SS
V
SS
V
SS
V
SS
Power supply input pins (V
CC
/V
SS
)
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