ST6225LD3/CCC View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST6225LD3/CCC

8-bit MCUs with A/D converter, two timers, oscillator safeguard & safe reset

STMicroelectronics 

ST6215C ST6225C

CLOCK AND TIMING CHARACTERISTICS (Cont’d)

11.5.3 Crystal and Ceramic Resonator Oscillators

The ST6 internal clock can be supplied with sever-

al different Crystal/Ceramic resonator oscillators.

Only parallel resonant crystals can be used. All the

information given in this paragraph are based on

characterization results with specified typical ex-

ternal components. Refer to the crystal/ceramic

resonator manufacturer for more details (frequen-

cy, package, accuracy...).

Symbol

RF

CL1

CL2

Parameter

Conditions

Feedback resistor

fOSC=32 kHz,

Recommended load capacitances versus equiva-

lent crystal or ceramic resonator frequency

fOSC=1 MHz

fOSC=2 MHz

fOSC=4 MHz

fOSC=8 MHz

Typ

Unit

3

MΩ

120

47

33

pF

33

22

Oscillator

Typical Crystal or Ceramic Resonators

Reference

Freq.

Characteristic 1)

CSB455E

455KHz ΔfOSC=[±0.5KHztolerance,±0.3%ΔTa,±0.5%aging]

CSB1000J

1MHz ΔfOSC=[±0.5KHztolerance,±0.3%ΔTa,±0.5%aging]

CSTCC2.00MG0H6 2MHz ΔfOSC=[±0.5%tolerance,±0.5%ΔTa,±0.3%aging]

CSTCC4.00MG0H6 4MHz ΔfOSC=[±0.5%tolerance,±0.3%ΔTa,±0.3%aging]

CSTCC8.00MG

8MHz ΔfOSC=[±0.5%tolerance,±0.3%ΔTa,±0.3%aging]

CL1 CL2 tSU(osc)

[pF] [pF] [ms] 1)

220 220

100 100

47 47

47 47

15 15

Notes:

1. Resonator characteristics given by the crystal/ceramic resonator manufacturer.

2. tSU(OSC) is the typical oscillator start-up time measured between VDD=2.8V and the fetch of the first instruction (with a

quick VDD ramp-up from 0 to 5V (<50μs).

3. 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.

Figure 50. Typical Application with a Crystal or Ceramic Resonator

VDD

CL1

OSCIN

RESONATOR

CL2

RF

OSCOUT

FOSC

ST62XX

74/105

1

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