STM8AF6246 STMicroelectronics, STM8AF6246 Datasheet - Page 58
STM8AF6246
Manufacturer Part Number
STM8AF6246
Description
STM8AF62 Standard Line
Manufacturer
STMicroelectronics
Datasheet
1.STM8AF6168.pdf
(91 pages)
Specifications of STM8AF6246
Max Fcpu
16 MHz
Flash Program Memory
16 to 32 Kbytes Flash; data retention 20 years at 55 °C after 1 kcycle
Data Memory
0.5 to 1 Kbyte true data EEPROM; endurance 300 kcycles
Ram
1 to 2 Kbytes
Advanced Control Timer
16-bit, 4 CAPCOM channels, 3 complementary outputs, dead-time insertion and flexible synchronization
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Electrical characteristics
Table 31.
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 16 MHz oscillation is
Figure 17. HSE oscillator circuit diagram
58/91
R
C
g
t
SU(HSE)
m
F
L1
Symbol
(C
reached. It can vary with the crystal type that is used.
/C
L1
L2
R
L
C
m
* C
m
m
(1)
(2)
Resonator
L2
)/(C
C
O
HSE oscillator characteristics
HSE oscillator critical g
The crystal characteristics have to be checked with the following formula:
where g
R
L
C
Co: Shunt capacitance (see crystal specification)
C
Feedback resistor
Recommended load capacitance
Oscillator transconductance
Startup time
m
L1
m
m
L1
: Notional inductance (see crystal specification)
: Notional resistance (see crystal specification)
: Notional capacitance (see crystal specification)
+ C
= C
L2
L2
). If C
mcrit
= C: Grounded external capacitance
Parameter
L1
can be calculated with the crystal parameters as follows:
= C
L2
C
C
, C
L1
L2
load
= C
L1
g
Resonator
and C
L1
m
mcrit
/ 2. Some oscillators have built-in load capacitors, C
formula
Doc ID 14952 Rev 5
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
STM8AF61xx, STM8AF62xx
Typ
220
2.8
)
Current control
-
-
2
f
HSE
L1
to core
and C
Max
20
-
-
-
L2
.
STM8A
load
) is
mA/V
Unit
ms
kΩ
pF