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ST72F521M Datasheet(PDF) 167 Page - STMicroelectronics

Part # ST72F521M
Description  8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE
PDF  199 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72F521M Datasheet(HTML) 167 Page - STMicroelectronics

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CLOCK CHARACTERISTICS (Cont’d)
12.5.4 RC Oscillators
The ST7 internal clock can be supplied with an RC
oscillator. This oscillator can be used with internal
or external components (selectable by option
byte).
Figure 85. Typical Application with RC oscillator
Notes:
1. Data based on design simulation.
2. REX must have a positive temperature coefficient (ppm/°C), carbon resistors should therefore not be used.
3. iCEX is the current needed to load the CEX capacitor while OSC1 is forced to VSS or 1.5V (RC oscillation voltage range).
Figure 86. Typical fOSC(RCINT) vs VDD
Figure 87. Typical fOSC(RCINT) vs TA
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fOSC (RCINT)
Internal RC oscillator frequency
See Figure 86 and Figure 87
TA=25°C, VDD=5V
2
3.5
5.6
MHz
fOSC(RCEXT)
External RC oscillator frequency 1)
5 / (REX.CEX)
REX
Oscillator external resistor 2)
56
100
K
Ω
CEX
Oscillator external capacitor
22
470
pF
|iCEX|
Capacitor load current 3)
OSC1 = VSS or 1.5V
290
350
µA
OSC2
OSC1
fOSC
CEX
REX
EXTERNAL RC
INTERNAL RC
VREF
+
-
VDD
Current copy
Voltage generator
CEX discharge
ST72XXX
RIN
CIN
iCEX
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
2.35
5
5.5
VDD(V)
TA=-45C
TA=25C
TA=130C
3
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4
-45
0
25
70
130
TA(°C)
Vdd = 2.4V
Vdd = 5V



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