stm8af6148 STMicroelectronics, stm8af6148 Datasheet - Page 61

• Manufacturer Part Number: stm8af6148
• Description: Automotive 8-bit Mcu, With Up To 32 Kbytes Flash, Eeprom, 10-bit Adc, Timers, Lin, Spi, I 2c, 3 V To 5.5 V
• Manufacturer: STMicroelectronics

STM8AF61xx STM8AH61xx
Table 24.
1. C is approximately equivalent to 2 x crystal Cload.
2. The oscillator selection can be optimized in terms of supply current using a high quality resonator with small R
3.
Figure 16. HSE oscillator circuit diagram
HSE oscillator critical g
R
L
C
Co: Shunt capacitance (see crystal specification)
C
g
g
t
SU(HSE)
m
m
mcrit
Symbol
m
m
L1
I
DD(HSE)
: Notional inductance (see crystal specification)
Refer to crystal manufacturer for more details
reached. This value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer.
: Notional resistance (see crystal specification)
: Notional capacitance (see crystal specification)
>> g
C
t
R
g
= C
SU(HSE)
(1)
m
F
R
L
C
=
m
m
m
L2
mcrit
(3)
Resonator
(
2
= C: Grounded external capacitance
is the start-up time measured from the moment it is enabled (by software) to a stabilized 16 MHz oscillation is
×
Feedback resistor
Recommended load capacitance
HSE oscillator power consumption
Oscillator transconductance
Startup time
C
O
HSE oscillator characteristics
Π
×
f
HSE
)
2
Parameter
×
m
R
formula
m
(
2Co
C
C
L1
L2
+
C
)
2
Resonator
(2)
Conditions
OSCIN
OSCOUT
C = 20 pF
C = 10 pF
stabilized
V
DD
is
Min
5
R
g
F
m
Typ
220
1
Consumption
Electrical characteristics
control
f
HSE
1.5 (stabilized)
to core
2 (stabilized)
6 (startup)
6 (startup)
Max
20
m
value.
STM8A
mA/V
Unit
61/90
mA
ms
kΩ
pF