st10f273m STMicroelectronics, st10f273m Datasheet - Page 155

• Manufacturer Part Number: st10f273m
• Description: 16-bit Mcu With 512 Kbyte Flash Memory And 36 Kbyte Ram
• Manufacturer: STMicroelectronics

ST10F273M
24.8.12
The given values of C
printed circuit board: the negative resistance values are calculated assuming additional 5pF
to the values in the table. The crystal shunt capacitance (C
capacitance between XTAL1 and XTAL2 pins is globally assumed equal to 4pF.
The external resistance between XTAL1 and XTAL2 is not necessary, since already present
on the silicon.
32 kHz oscillator specifications
V
Table 67.
1. At power-on a high current biasing is applied for faster oscillation start-up. Once the oscillation is started,
2. Not 100% tested, guaranteed by design characterization.
Figure 49. 32 kHz crystal oscillator connection diagram
Table 68.
The given values of C
printed circuit board: The negative resistance values are calculated assuming additional 5pF
to the values in the table. The crystal shunt capacitance (C
between XTAL3 and XTAL4 pins is globally assumed equal to 4pF. The external resistance
between XTAL3 and XTAL4 is not necessary, since already present on the silicon.
g
V
V
t
Frequency
Symbol
STUP32
DD
m32
AV32
OSC32
32 kHz
the current biasing is reduced to lower the power consumption of the system.
= 5V ± 10%, V
Oscillator transconductance
Oscillation amplitude
Oscillation voltage level
Oscillator start-up time
32 kHz oscillator characteristics
Minimum values of negative resistance (module) for 32 kHz oscillator
C
A
= 6pF
-
Parameter
SS
A
A
= 0V, T
do not include the stray capacitance of the package and of the
do not include the stray capacitance of the package and of the
C
A
= 12pF C
(2)
-
A
(2)
(2)
= -40 to +125°C
(1)
A
= 15pF C
Start-up
Normal run
Peak to peak
Sine wave middle
Stable V
-
ST10F273M
C
Conditions
Crystal
A
DD
A
= 18pF C
-
C
A
0
0
), the package and the stray
Min
A
) and the package capacitance
150 kΩ
0.5
0.7
20
8
–
= 22pF C
Electrical characteristics
Value
Typ
1.0
0.9
31
17
1
A
120 kΩ
= 27pF C
Max
2.4
1.2
50
30
5
A
90 kΩ
= 33pF
155/182
µA/V
Unit
V
s