stm8af6166tdy STMicroelectronics, stm8af6166tdy Datasheet - Page 58

• Manufacturer Part Number: stm8af6166tdy
• Description: Automotive 8-bit Mcu, With Up To 32 Kbytes Flash, Data Eeprom, 10-bit Adc, Timers, Lin, Spi, I2c, 3 To 5.5 V
• Manufacturer: STMicroelectronics

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