參數(shù)資料
型號: ATMEGA644PA-PU
廠商: Atmel
文件頁數(shù): 90/160頁
文件大?。?/td> 0K
描述: IC MCU 8BIT 64KB FLASH 40DIP
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
megaAVR Introduction
標準包裝: 10
系列: AVR® ATmega
核心處理器: AVR
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 64KB(32K x 16)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量: 4K x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 40-DIP(0.600",15.24mm)
包裝: 管件
產(chǎn)品目錄頁面: 614 (CN2011-ZH PDF)
配用: ATSTK600-RC05-ND - STK600 ROUTING CARD AVR
35
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
2. These options are intended for use with ceramic resonators and will ensure frequency stability
at start-up. They can also be used with crystals when not operating close to the maximum fre-
quency of the device, and if frequency stability at start-up is not important for the application.
9.5
Low Frequency Crystal Oscillator
The Low-frequency Crystal Oscillator is optimized for use with a 32.768kHz watch crystal. When
selecting crystals, load capasitance and crystal’s Equivalent Series Resistance, ESR must be
ta ken into cons ideration. Both values ar e specified by the crystal vendor. Atmel
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P oscillator is optimized for very low
power consumption, and thus when selecting crystals, see Table 9-7 on page 35 for maximum
ESR recommendations on 9pF and 12.5pF crystals.
Note:
1. Maximum ESR is typical value based on characterization.
The Low-frequency Crystal Oscillator provides an internal load capacitance, see Table on page
35 at each TOSC pin.
The capacitance (Ce + Ci) needed at each TOSC pin can be calculated by using:
where:
Ce - is optional external capacitors as described in Figure 9-2 on page 32
Ci - is is the pin capacitance in Table 9-8 on page 35
CL - is the load capacitance for a 32.768kHz crystal specified by the crystal vendor.
C
S - is the total stray capacitance for one TOSC pin.
Crystals specifying load capacitance (CL) higher than the ones given in the Table 9-8 on page
35, require external capacitors applied as described in Figure 9-2 on page 32.
Figure 9-3.
Crystal oscillator connections.
Crystals specifying load capacitance (CL) higher than listed in Table 9-8 on page 35, require
external capacitors applied as described in Figure 9-2 on page 32.
Table 9-7.
Maximum ESR Recommendation for 32.768kHz Watch Crystal.
Crystal CL [pF]
Max ESR [k
9.0
65
12.5
30
Table 9-8.
Capacitance for Low-frequency oscillator.
Device
32kHz osc. type
Cap (Xtal1/Tosc1)
Cap (Xtal2/Tosc2)
ATmega164A/164PA/324A/324PA/
644A/644PA/1284/1284P
System osc.
18pF
8pF
Timer osc.
6pF
Ce
Ci
+
2 CL
C
s
=
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