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ST6215C Datasheet(PDF) 75 Page - STMicroelectronics

Part No. ST6215C
Description  8-BIT MCUs WITH A/D CONVERTER, TWO TIMERS, OSCILLATOR SAFEGUARD & SAFE RESET
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST6215C Datasheet(HTML) 75 Page - STMicroelectronics

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ST6215C/ST6225C
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CLOCK AND TIMING CHARACTERISTICS (Cont’d)
11.5.4 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.
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
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fOSC
RC oscillator frequency 1)
RNET=22 kΩ
RNET=47 kΩ
RNET=100 kΩ
RNET=220 kΩ
RNET=470 kΩ
7.2
5.1
3.2
1.8
0.9
8.6
5.7
3.4
1.9
0.95
10
6.5
3.8
2
1.1
MHz
RNET=22 kΩ
RNET=47 kΩ
RNET=100 kΩ
RNET=220 kΩ
RNET=470 kΩ
3.7
2.8
1.8
1
0.5
4.3
3
1.9
1.1
0.55
4.9
3.3
2
1.2
0.6
RNET
RC Oscillator external resistor 2)
see Figure 52 & Figure 53
22
870
k
OSCIN
OSCOUT
RNET
EXTERNAL RC
CEX~9pF DISCHARGE
ST62XX
VDD
VDD
fOSC
VDD
NC
MIRROR
CURRENT
1


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