STM8AF62A9 STMicroelectronics, STM8AF62A9 Datasheet - Page 67
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STM8AF62A9
Manufacturer Part Number
STM8AF62A9
Description
STM8AF62 Standard Line
Manufacturer
STMicroelectronics
Datasheet
1.STM8AF5168.pdf
(106 pages)
Specifications of STM8AF62A9
Max Fcpu
24 MHz
Program Memory
32 to 128 Kbytes Flash program; data retention 20 years at 55 °C
Data Memory
up to 2 Kbytes true data EEPROM; endurance 300 kcycles
Ram
2 Kbytes to 6 Kbytes
Advanced Control Timer
16-bit, 4 CAPCOM channels, 3 complementary outputs, dead-time insertion and flexible synchronization
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STM8AF52/62xx, STM8AF51/61xx
Table 33.
1. The oscillator needs two load capacitors, C
2. This value is the startup time, measured from the moment it is enabled (by software) until a stabilized 24 MHz oscillation is
Figure 19. HSE oscillator circuit diagram
C
t
SU(HSE)
Symbol
(C
reached. It can vary with the crystal type that is used.
L1
L1
R
/C
g
R
L
C
m
F
m
L2
* C
m
m
Resonator
(1)
(2)
L2
)/(C
C
O
HSE oscillator characteristics
HSE oscillator critical g
The crystal characteristics have to be checked with the following formula:
Equation 1
where g
Equation 2
Feedback resistor
Recommended load capacitance
Oscillator trans conductance
Startup time
L1
+ C
R
L
C
Co: Shunt capacitance (see crystal specification)
C
m
m
m
L1
L2
: Notional inductance (see crystal specification)
). If C
mcrit
: Notional resistance (see crystal specification)
: Notional capacitance (see crystal specification)
= C
Parameter
L1
can be calculated with the crystal parameters as follows:
L2
= C
= C: Grounded external capacitance
L2
C
C
, C
L1
L2
load
= C
L1
g
Resonator
and C
L1/2
m
mcrit
formula
Doc ID 14395 Rev 8
. Some oscillators have built-in load capacitors, C
L2
=
, to act as load for the crystal. The total load capacitance (C
Conditions
OSCIN
OSCOUT
stabilized
(
2
V
×
DD
—
—
—
Π
is
g
×
m
f
HSE
»
g
mcrit
)
2
×
Min
—
—
—
5
R
m
(
R
2Co
g
F
m
+
C
Typ
220
2.8
—
—
)
Current control
2
Electrical characteristics
f
HSE
L1
to core
and C
Max
20
—
—
—
L2
.
STM8A
Load
) is
67/106
mA/V
Unit
ms
kΩ
pF
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