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参数资料
| 型号： | ST72323K1T5/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP32 |
| 封装： | 7 X 7 MM, PLASTIC, LQFP-32 |
| 文件页数： | 4/140页 |
| 文件大小： | 1386K |
| 代理商： | ST72323K1T5/XXX |
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ST72323
101/140
CLOCK AND TIMING CHARACTERISTICS (Cont’d)
11.5.3 Crystal and Ceramic Resonator Oscillators
The ST7 internal clock can be supplied with four
different Crystal/Ceramic resonator oscillators. All
the information given in this paragraph are based
on characterization results with specified typical
external components. In the application, the reso-
nator and the load capacitors have to be placed as
close as possible to the oscillator pins in order to
minimize output distortion and start-up stabiliza-
tion time. Refer to the crystal/ceramic resonator
manufacturer for more details (frequency, pack-
age, accuracy...).
Figure 63. Typical Application with a Crystal or Ceramic Resonator
Notes:
1. The oscillator selection can be optimized in terms of supply current using an high quality resonator with small RS value.
Refer to crystal/ceramic resonator manufacturer for more details.
2. Data based on characterisation results, not tested in production. The relatively low value of the RF resistor, offers a
good protection against issues resulting from use in a humid environment, due to the induced leakage and the bias con-
dition change. However, it is recommended to take this point into account if the C is used in tough humidity conditions.
3. For CL1 and CL2 it is recommended to use high-quality ceramic capacitors in the 5-pF to 25-pF range (typ.) designed
for high-frequency applications and selected to match the requirements of the crystal or resonator. CL1 and CL2, are usu-
ally the same size. The crystal manufacturer typically specifies a load capacitance which is the series combination of CL1
and CL2. PCB and MCU pin capacitance must be included when sizing CL1 and CL2 (10 pF can be used as a rough es-
timate of the combined pin and board capacitance).
Symbol
Parameter
Conditions
Min
Max
Unit
fOSC
Oscillator Frequency 1)
116
MHz
RF
Feedback resistor2)
20
40
k
CL1
CL2
Recommended load capacitance ver-
sus equivalent serial resistance of the
crystal or ceramic resonator (RS)
3)
fOSC= 1 to 2 MHz
fOSC= 2 to 4 MHz
fOSC= 4 to 8 MHz
fOSC= 8 to 16 MHz
20
15
60
50
35
pF
Symbol
Parameter
Conditions
Typ
Max
Unit
i2
OSC2 driving current
VIN=VSS
fOSC= 1 to 2 MHz
fOSC= 2 to 4 MHz
fOSC= 4 to 8 MHz
fOSC= 8 to 16 MHz
80
160
310
610
150
250
460
910
A
OSC2
OSC1
fOSC
CL1
CL2
i2
RF
ST72XXX
RESONATOR
WHEN RESONATOR WITH
INTEGRATED CAPACITORS
VDD/2
Ref
POWER DOWN
LOGIC
FEEDBACK
LOOP
LINEAR
AMPLIFIER
1
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