ST7MC2N6T3 查看數據表（PDF） - STMicroelectronics

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ST7MC2N6T3

8-bit MCU with nested interrupts, Flash, 10-bit ADC, brushless motor control, five timers, SPI, LINSCI™

STMicroelectronics 

ST7MC1xx/ST7MC2xx

CLOCK AND TIMING CHARACTERISTICS (Cont’d)

12.5.3 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...).

Symbol

fOSC

RF

CL1

CL2

Parameter

Oscillator Frequency 1)

Feedback resistor

Recommended load capacitance ver-

sus equivalent serial resistance of the

crystal or ceramic resonator (RS)

Conditions

Min

Typ

Max

4

16

92

See table below

Unit

MHz

kΩ

pF

Supplier

fOSC

(MHz)

4

8

16

Typical Ceramic Resonators2)

Reference 3)

CSTCR4M00G53-R0

CSTCE8M00G52-R0

CSTCE16M0V53-R0

CL1

[pF]

(15)

(10)

(15)

Figure 136. Typical Application with a Crystal or Ceramic Resonator

WHEN RESONATOR WITH

INTEGRATED CAPACITORS

CL1

OSC1

i2

fOSC

CL2

[pF]

(15)

(10)

(15)

RESONATOR

RF

CL2

OSC2

ST7FMC

Notes:

1. When PLL is used, please refer to the PLL characteristics chapter and to the “supply, reset and clock management”

description chapter (fOSC min. is 8 Mhz with PLL).

2. Resonator characteristics given by the ceramic resonator manufacturer. For more information on these resonators,

please consult www.murata.com

3. SMD = [-R0: Plastic tape package (ý =180mm), -B0: Bulk]

LEAD = [-A0: Flat pack package (Radial taping Ho= 18mm), -B0: Bulk]

257/309

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