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STM8AP5X46TAY Datasheet(PDF) 68 Page - STMicroelectronics

Part # STM8AP5X46TAY
Description  Automotive 8-bit MCU, with up to 128 Kbytes Flash, EEPROM, 10-bit ADC, timers, LIN, CAN, USART, SPI, I2C, 3 V to 5.5 V
PDF  100 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM8AP5X46TAY Datasheet(HTML) 68 Page - STMicroelectronics

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Electrical characteristics
STM8AF61xx, STM8AF51xx
68/100
Figure 18.
HSE oscillator circuit diagram
HSE oscillator critical gm formula
Rm: Notional resistance (see crystal specification)
Lm: Notional inductance (see crystal specification)
Cm: Notional capacitance (see crystal specification)
Co: Shunt capacitance (see crystal specification)
CL1 = CL2 = C: Grounded external capacitance
gm >> gmcrit
Table 25.
HSE oscillator characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
RF
Feedback resistor
220
k
Ω
C(1)
Recommended load capacitance(2)
20
pF
IDD(HSE)
HSE oscillator power consumption
C = 20 pF
6 (startup)
2 (stabilized)
mA
C = 10 pF
6 (startup)
1.5 (stabilized)
gm
Oscillator transconductance
5
mA/V
tSU(HSE)
(3) Startup time
VDD is
stabilized
1ms
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 Rm value.
Refer to crystal manufacturer for more details
3.
tSU(HSE) is the start-up time measured from the moment it is enabled (by software) to a stabilized 24 MHz oscillation is
reached. This value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer.
OSCOUT
OSCIN
fHSE to core
CL1
CL2
RF
STM8A
Resonator
Consumption
control
gm
Rm
Cm
Lm
CO
Resonator
g
mcrit
2
Π
×
HSE
f
×
()
2
R
m
×
2Co
C
+
()
2
=



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