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參數(shù)資料
| 型號： | M37641F8FP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 14 X 20 MM, 0.80 MM, PLASTIC, QFP-80 |
| 文件頁數(shù)： | 40/140頁 |
| 文件大?。?/td> | 1694K |
| 代理商： | M37641F8FP |
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7641 Group
Rev.4.00
Aug 28, 2006
page 132 of 135
REJ03B0191-0400
USAGE NOTES
Oscillator Connection Notice
The built-in feedback register (1 M
) and the dumping resistor
(400
) is internally connected between pins XIN and XOUT.
Power Source Voltage
When the power source voltage value of a microcomputer is less
than the value which is indicated as the recommended operating
conditions, the microcomputer does not operate normally and may
perform unstable operation.
In a system where the power source voltage drops slowly when
the power source voltage drops or the power supply is turned off,
reset a microcomputer when the power source voltage is less than
the recommended operating conditions and design a system not
to cause errors to the system by this unstable operation.
Power Supply Pins Treatment Notice
Please connect 0.1
F and 4.7 F capacitors in parallel between
pins Vcc and Vss, and pins AVss and AVcc.
These capacitors must be connected as close as possible be-
tween the DC supply and GND pins, and also the analog supply
pin and corresponding GND pin.
Wiring patterns for these supply and GND pins must be wider than
other signal patterns.
These filter capacitors should not be placed near the LPF pins as
they will cause noise problems
Reset Pin Treatment Notice (Noise
Elimination)
If the reset input signal rises very slowly, we recommend attaching
a capacitor, such as a 1000 pF ceramic capacitor with excellent
high frequency characteristics, between the RESET pin and the
Vss pin.
Please note the following two issues for this capacitor connection.
(1) Capacitor wiring pattern must be as short as possible (within
20 mm).
(2) The user must perform an application level operation test.
LPF Pin Treatment Notice
All passive components must be located as close as possible to
the LPF pin.
0.1
F
680 pF
LPF pin
AVSS pin
1 k
Fig. 111 Passive components near LPF pin
In Vcc = 3.3 V operation, connect the Ext. Cap. pin directly to the
Vcc pin in order to supply power to the USB transceiver. In addi-
tion, you will need to disable the DC-DC converter in this
operation (set bit 4 of the USB control register to “0”.) If you are
using the bus powered supply in Vcc = 3.3 V operation, the DC-
DC converter must be placed outside the MCU.
In Vcc = 5 V operation, do not connect the external DC-DC con-
verter to the Ext. Cap. pin. Use the built-in DC-DC converter by
enabling the USB line driver.
Make sure the USB D+/D- lines do not cross any other wires.
Keep a large GND area to protect the USB lines. Also, make sure
you use a USB specification compliant connecter for the connec-
tion.
XIN
enable
lock
FSE
LS
USBC5
enable
USB Clock
(48 MHz)
USB FCU
enable
USBC7
USB
transceiver
enable
USBC7
DC-DC converter
enable
USBC4
current
mode
USBC3
Ext. Cap.
2
.2
F
0
.1
F
D+
D-
1
.5
k
Frequency Synthesizer
Note 1
Notes 1: In Vcc = 3.3 V, connect to Vcc. In Vcc =5 V, do not connect the external DC-DC
converter to the Ext. Cap pin.
2: The resistors values depend on the layout of the printed circuit board.
Note 2
Fig.112 Peripheral circuit
AVss and AVcc Pin Treatment Notice (Noise
Elimination)
An insulation connector (Ferrite Beads) must be connected be-
tween AVss and Vss pins and between AVcc and Vcc pins.
USB
Transceiver
Treatment
(Noise
Elimination)
The Full-Speed USB2.0 specification requires a driver -imped-
ance 28 to 44
. (Refer to Clause 7.1.1.1 Full-speed (12 Mb/s)
Driver Characteristics in the USB specification.) In order to meet
the USB specification impedance requirements, connect a resis-
tor (27
to 33 recommended) in series to the USB D+ pin and
the USB D- pin.
In addition, in order to reduce the ringing and control the falling/
rising timing of USB D+/D- and a crossover point, connect a ca-
pacitor between the USB D+/D- pins and the Vss pin if necessary.
The values and structure of those peripheral elements depend on
the impedance characteristics and the layout of the printed circuit
board. Accordingly, evaluate your system and observe waveforms
before actual use and decide use of elements and the values of
resistors and capacitors.
Connect a capacitor between the Ext. Cap. pin and the Vss pin.
The capacitor should have a 2.2
F capacitor (Tantalum capaci-
tor) and a 0.1
F capacitor (ceramic capacitor) connected in
parallel. Figure 112 for the proper positions of the peripheral com-
ponents.
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相關代理商/技術參數(shù) |
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| M37641F8FP#U0 | 功能描述:IC 740 MCU FLASH 32K 80QFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/7600 標準包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設備:POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):21 程序存儲器容量:40KB（20K x 16） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數(shù)據(jù)轉換器:A/D 6x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
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