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STM32F103RBT6XXX Datasheet(PDF) 51 Page - STMicroelectronics

Part # STM32F103RBT6XXX
Description  Medium-density performance line ARM-based 32-bit MCU with 64 or 128 KB Flash, USB, CAN, 7 timers, 2 ADCs, 9 communication interfaces
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32F103RBT6XXX Datasheet(HTML) 51 Page - STMicroelectronics

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STM32F103x8, STM32F103xB
Electrical characteristics
Doc ID 13587 Rev 11
51/92
Note:
For CL1 and CL2 it is recommended to use high-quality ceramic capacitors in the 5 pF to
15 pF range selected to match the requirements of the crystal or resonator. CL1 and CL2, are
usually the same size. The crystal manufacturer typically specifies a load capacitance which
is the series combination of CL1 and CL2.
Load capacitance CL has the following formula: CL = CL1 x CL2 / (CL1 + CL2) + Cstray where
Cstray is the pin capacitance and board or trace PCB-related capacitance. Typically, it is
between 2 pF and 7 pF.
Caution:
To avoid exceeding the maximum value of CL1 and CL2 (15 pF) it is strongly recommended
to use a resonator with a load capacitance CL 7 pF. Never use a resonator with a load
capacitance of 12.5 pF.
Example: if you choose a resonator with a load capacitance of CL = 6 pF, and Cstray = 2 pF,
then CL1 = CL2 = 8 pF.
Figure 23.
Typical application with a 32.768 kHz crystal
5.3.7
Internal clock source characteristics
The parameters given in Table 24 are derived from tests performed under ambient
temperature and VDD supply voltage conditions summarized in Table 9.
Table 23.
LSE oscillator characteristics (fLSE = 32.768 kHz)
(1)
1.
Based on characterization, not tested in production.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
RF
Feedback resistor
5
M
C(2)
2.
Refer to the note and caution paragraphs below the table, and to the application note AN2867 “Oscillator
design guide for ST microcontrollers.
Recommended load capacitance
versus equivalent serial
resistance of the crystal (RS)
(3)
3.
The oscillator selection can be optimized in terms of supply current using an high quality resonator with
small RS value for example MSIV-TIN32.768kHz. Refer to crystal manufacturer for more details
RS = 30 k
15
pF
I2
LSE driving current
VDD = 3.3 V, VIN = VSS
1.4
µA
gm
Oscillator Transconductance
5
µA/V
tSU(LSE)
(4)
4.
tSU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768
kHz oscillation is reached. This value is measured for a standard crystal resonator and it can vary
significantly with the crystal manufacturer
startup time
VDD is stabilized
3
s
ai14146
OSC32_OU T
OSC32_IN
fLSE
CL1
RF
STM32F103xx
32.768 kH z
resonator
CL2
Resonator with
integrated capacitors
Bias
controlled
gain


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