参数资料
型号: ST72T734J6B1
厂商: 意法半导体
元件分类: ADC
英文描述: 8-BIT USB MCU FOR MONITORS, WITH UP TO 60K OTP, 1K RAM, ADC, TIMER, SYNC, TMU, PWM/BRM, H/W DDC & I2C
中文描述: 8位USB单片机的显示器,高达60K章检察官办公室,每1000内存,模数转换器,定时器,同步,材质单元,脉宽调制/的BRM,的H / W DDC的
文件页数: 56/144页
文件大小: 1280K
代理商: ST72T734J6B1
ST72774/ST727754/ST72734
19/144
CLOCK SYSTEM (Cont’d)
3.1.2 Crystal Resonator
The internal oscillator is designed to operate with
an
AT-cut
parallel
resonant
quartz
crystal
resonator in the frequency range specified for fosc.
The circuit shown in Figure 8 is recommended
when
using
a
crystal,
and
Table 4,
“.
Recommended Crystal Values,” on page 19 lists
the recommended capacitance and feedback
resistance values. The crystal and associated
components should be mounted as close as
possible to the input pins in order to minimize
output distortion and start-up stabilization time.
Figure 8. Crystal/Ceramic Resonator
Table 4
. Recommended Crystal Values
Legend:
CL1, CL2 = Maximum total capacitance on pins
OSCIN and OSCOUT (the value includes the
external capacitance tied to the pin plus the
parasitic capacitance of the board and of the
device).
RSMAX = Maximum series parasitic resistance of
the quartz allowed.
Note: The tables are relative to the quartz crystal
only (not ceramic resonator).
3.1.3 External Clock
An external clock should be applied to the OSCIN
input with the OSCOUT pin not connected as
shown in Figure 9. The Crystal clock specifications
do not apply when using an external clock input.
The equivalent specification of the external clock
source should be used.
Figure 9. External Clock Source Connections
OSCIN
OSCOUT
CL1
CL2
CRYSTAL CLOCK
1M*
*Recommended for oscillator stability
24 Mhz
Unit
RSMAX
70
25
20
Ohms
CL1
22
47
56
pf
CL2
22
47
56
pf
OSCIN
OSCOUT
EXTERNAL
CLOCK
NC
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