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STM8S105C4B3 Datasheet(PDF) 77 Page - STMicroelectronics

Part # STM8S105C4B3
Description  Access line, 16 MHz STM8S 8-bit MCU, up to 32 Kbytes Flash, integrated EEPROM,10-bit ADC, timers, UART, SPI, I²C
PDF  127 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM8S105C4B3 Datasheet(HTML) 77 Page - STMicroelectronics

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Figure 19: HSE external clocksource
V
HSEH
V HSEL
External clock
source
OSCIN
fHSE
STM8
HSE crystal/ceramic resonator oscillator
The HSE clock can be supplied with a 1 to 16 MHz crystal/ceramic resonator oscillator. All
the information given in this paragraph is based on characterization results with specified
typical external components. In the application, the resonator and the load capacitors have
to be placed as close as possible to the oscillator pins in order to minimize output distortion
and start-up stabilization time. Refer to the crystal resonator manufacturer for more details
(frequency, package, accuracy...).
Table 33: HSE oscillator characteristics
Unit
Max
Typ
Min
Conditions
Parameter
Symbol
MHz
16
1
External high speed
oscillator frequency
fHSE
kΩ
220
Feedback resistor
RF
pF
20
Recommended load
capacitance
(2)
C
(1)
mA
6 (startup)
C = 20 pF,
HSE oscillator power
consumption
IDD(HSE)
1.6 (stabilized)
(3)
fOSC = 16 MHz
6 (startup)
C = 10 pF,
1.2 (stabilized)
(3)
fOSC =16 MHz
mA/V
5
Oscillator
transconductance
gm
ms
1
VDD is stabilized
Startup time
tSU(HSE)
(4)
(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) Data based on characterization results, not tested in production.
77/127
DocID14771 Rev 9
Electrical characteristics
STM8S105xx



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