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STM32G070KB Folha de dados(PDF) 53 Page - STMicroelectronics

Nome de Peças STM32G070KB
Descrição Electrónicos  Arm® Cortex®-M0 32-bit MCU, 128 KB Flash, 36 KB RAM, 4x USART, timers, ADC, comm. I/Fs, 2.0-3.6V
PDF  93 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
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STM32G070KB Folha de dados(HTML) 53 Page - STMicroelectronics

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DS12766 Rev 2
53/93
STM32G070CB/KB/RB
Electrical characteristics
80
Low-speed external user clock generated from an external source
In bypass mode the LSE oscillator is switched off and the input pin is a standard GPIO.
The external clock signal has to respect the I/O characteristics in Section 5.3.14. See
Figure 12 for recommended clock input waveform.
Figure 12. Low-speed external clock source AC timing diagram
High-speed external clock generated from a crystal/ceramic resonator
The high-speed external (HSE) clock can be supplied with a 4 to 48 MHz crystal/ceramic
resonator oscillator. All the information given in this paragraph are based on design
simulation results obtained with typical external components specified in Table 35. 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 startup stabilization time. Refer
to the crystal resonator manufacturer for more details on the resonator characteristics
(frequency, package, accuracy).
Table 34. Low-speed external user clock characteristics(1)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fLSE_ext User external clock source frequency
-
-
32.768
1000
kHz
VLSEH OSC32_IN input pin high level voltage
-
0.7 VDDIO1
-VDDIO1
V
VLSEL
OSC32_IN input pin low level voltage
-
VSS
-
0.3 VDDIO1
tw(LSEH)
tw(LSEL)
OSC32_IN high or low time
-
250
-
-
ns
1. Guaranteed by design.
MS19215V2
VLSEH
tf(LSE)
90%
10%
TLSE
t
tr(LSE)
VLSEL
tw(LSEH)
tw(LSEL)
Table 35. HSE oscillator characteristics(1)
Symbol
Parameter
Conditions(2)
Min
Typ
Max
Unit
fOSC_IN
Oscillator frequency
-
4
8
48
MHz
RF
Feedback resistor
-
-
200
-
kΩ



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