ST62T09LN1/CCC 데이터 시트보기 (PDF) - STMicroelectronics

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ST62T09LN1/CCC

8-BIT MCUs WITH A/D CONVERTER, TWO TIMERS, OSCILLATOR SAFEGUARD & SAFE RESET

STMicroelectronics 

ST6208C/ST6209C/ST6210C/ST6220C

CLOCK AND TIMING CHARACTERISTICS (Cont’d)

10.5.4 RC Oscillator

The ST6 internal clock can be supplied with an external RC oscillator. Depending on the RNET value, the

accuracy of the frequency is about 20%, so it may not be suitable for some applications.

Symbol

Parameter

Conditions

Min Typ Max Unit

fOSC

RC oscillator frequency 1)

RNET

RC Oscillator external resistor 2)

RNET=22 kΩ

7.2

RNET=47 kΩ

5.1

RNET=100 kΩ

3.2

RNET=220 kΩ

1.8

RNET=470 kΩ

0.9

RNET=22 kΩ

3.7

RNET=47 kΩ

2.8

RNET=100 kΩ

1.8

RNET=220 kΩ

1

RNET=470 kΩ

0.5

see Figure 52 & Figure 53 22

8.6

5.7

3.4

1.9

0.95

4.3

3

1.9

1.1

0.55

10

6.5

3.8

2

1.1

MHz

4.9

3.3

2

1.2

0.6

870 kΩ

Notes:

1. Data based on characterization results, not tested in production. These measurements were done with the OSCin pin

unconnected (only soldered on the PCB).

2. RNET must have a positive temperature coefficient (ppm/°C), carbon resistors should therefore not be used.

Figure 51. Typical Application with RC Oscillator

EXTERNAL RC

OSCOUT

RNET

OSCIN

NC

fOSC

VDD

VDD

VDD

MIRROR

CURRENT

74/104

1

CEX~9pF DISCHARGE

ST62XX

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