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參數(shù)資料
| 型號： | MC68HC16Z1VEH16 |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 56/56頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU 16BIT 1K FLASH 132-PQFP |
| 標(biāo)準(zhǔn)包裝： | 36 |
| 系列： | HC16 |
| 核心處理器： | CPU16 |
| 芯體尺寸： | 16-位 |
| 速度： | 16MHz |
| 連通性： | EBI/EMI，SCI，SPI |
| 外圍設(shè)備： | POR，PWM，WDT |
| 輸入/輸出數(shù)： | 16 |
| 程序存儲器類型： | ROMless |
| RAM 容量： | 1K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.7 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 ~ 105°C |
| 封裝/外殼： | 132-BQFP 緩沖式 |
| 包裝： | 托盤 |
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Figure 3 shows clock circuitry for a Daishinku DMX-38 32.768 kHz crystal, but the circuit will work for
most other 32.768 kHz crystals also. To use other crystal values (the allowable range is 20 kHz – 50
kHz), consult the crystal vendor for analysis of the crystal components needed.
Figure 3 System Clock with a 32.768 kHz Reference Crystal
For the most accurate oscillator frequency, use the Pierce version of the crystal (rather than the series
resonant version) with C1 and C2 values to match the specified load capacitance of the crystal. As a
side note, start-up time is inversely proportional to frequency. A 32 kHz crystal may take several hun-
dred milliseconds to start up. Be aware: all crystals are not created equal nor are they close. In fact,
there are several different types of tuning elements that can be used for low frequency oscillators in the
range of 32.768 kHz. While there are many characteristics of the various tuning elements that can be
precisely measured, there are other characteristics that are extremely difficult to measure and express
in a useful way.
Maximum power dissipation of a crystal is generally specified by the manufacturer of the device. Crystal
power dissipation is a function of the reactance of the combined input and output capacitance of the
internal amplifier of the microcontroller and of the external circuit components including the crystal itself.
The manufacturer specifies this value and also specifies a circuit, usually one like that of Figure 3, along
with the circuit values. The crystal manufacturer makes a tacit assumption that the amplifier has enough
drive capability to handle the required load, so that the output voltage levels of the amplifier are not af-
fected.
Parameters related to suppression of harmonics and overtones are generally not specified by the crys-
tal manufacturer. Harmonics are integer multiples of the fundamental frequency. The first overtone is
approximately 1.7 times the fundamental frequency. Since a typical oscillator circuit forms a low pass
filter, the 3 db roll-off point should be set at about 1.5 times the fundamental frequency of the crystal.
This should cause no attenuation at the fundamental but should cause significant attenuation at the first
overtone and even greater attenuation at the first harmonic. When figuring the reactance of the entire
circuit, it is most important to use the typical parameters of the crystal, the input and output capacitance
of the amplifier and the remainder of the external components in the calculation.
Many companies make crystals. Most re-sell their products through electronics distributors that are list-
ed in the
EITD Electronic Industry Telephone Directory. Refer to 6 Sources of Information for ordering
information.
Four crystal manufacturers are:
ECS — (800) 237-1041
The part number for a surface mount 32.768 kHz crystal with a temperature range of –40 to +85 degrees
Celsius is ECX205. This crystal also comes in other packages.
Fox — (813) 693-0099
332TUT XTAL CONN 1
EXTAL
XTAL
10M
330K
22 PF*
VSSI
RESISTANCE AND CAPACITANCE BASED ON A TEST CIRCUIT CONSTRUCTED WITH A DAISHINKU DMX-38 32.768-KHZ CRYSTAL.
SPECIFIC COMPONENTS MUST BE BASED ON CRYSTAL TYPE. CONTACT CRYSTAL VENDOR FOR EXACT CIRCUIT.
*
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C1
C2
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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