ST72324BLS2T6 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72324BLS2T6

3V range 8-bit MCU with 8 to 32K Flash/ROM, 10-bit ADC, 4 timers, SPI, SCI interface

STMicroelectronics 

ST72324Lxx

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

Parameter

Conditions

Min

fOSC

Oscillator Frequency 1)

LP: Low power oscillator

1

MP: Medium power oscillator

>2

MS: Medium speed oscillator

>4

HS: High speed oscillator

>8

RF

Feedback resistor

20

CL1

CL2

Recommended load capacitance ver-

sus equivalent serial resistance of the

crystal or ceramic resonator (RS)

RS=200Ω

RS=200Ω

RS=200Ω

RS=100Ω

LP osc. (1-2 MHz)

MP osc. (2-4 MHz)

MS osc. (4-8 MHz)

HS osc. (8-16 MHz)

22

22

18

15

Max

2

4

8

16

56

46

33

33

Unit

MHz

kΩ

pF

Symbol

Parameter

i2

OSC2 driving current

Conditions

Typ

Max

Unit

VIN=VSS LP osc. (1-2 MHz)

80

150

MP osc. (2-4 MHz) 160

250

MS osc. (4-8 MHz) 310

460

µA

HS osc. (8-16 MHz) 610

910

Figure 63. Typical Application with a Crystal or Ceramic Resonator

WHEN RESONATOR WITH

INTEGRATED CAPACITORS

CL1

OSC1

i2

fOSC

RESONATOR

RF

CL2

OSC2

ST72XXX

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.

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