st10f272z2 STMicroelectronics, st10f272z2 Datasheet - Page 163

• Manufacturer Part Number: st10f272z2
• Description: 16-bit Mcu With 256 Kbyte Flash Memory And 20 Kbyte Ram
• Manufacturer: STMicroelectronics

ST10F272Z2
25.8.12
Table 74.
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 XTAL1 and XTAL2 pins is globally assumed equal to 10pF.
The external resistance between XTAL1 and XTAL2 is not necessary, since already present
on the silicon.
32 kHz oscillator specifications
V
Table 75.
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 51. 32kHz crystal oscillator connection diagram
4 MHz
8 MHz
Symbol
t
V
DD
STUP32
V
g
OSC32
AV32
the current biasing is reduced to lower the power consumption of the system.
m32
= 5 V ± 10 %, V
545 Ω
240 Ω
Oscillator Transconductance
Oscillation Amplitude
Oscillation Voltage level
Oscillator Start-up Time
min.
Main oscillator negative resistance (module)
32kHz oscillator characteristics
C
A
1035 Ω
Parameter
450 Ω
= 15 pF
typ.
SS
A
do not include the stray capacitance of the package and of the
= 0 V, T
max.
2)
–
–
A
2)
2)
= –40 to +125 °C
1)
550 Ω
170 Ω
ST10F272Z2
min.
Start-up
Normal run
Peak to Peak
Sine wave middle
Stable V
C
A
crystal
Conditions
C
A
1050 Ω
DD
350 Ω
= 25 pF
typ.
C
A
max.
–
–
0
min.
) and the package capacitance
0.5
0.7
20
8
–
Electrical characteristics
430 Ω
120 Ω
min.
Value
typ.
1.0
0.9
31
17
1
C
A
850 Ω
250 Ω
= 35 pF
typ.
max.
2.4
1.2
50
30
5
163/189
max.
µA/V
µA/V
Unit
–
–
V
V
s