STM32F103T8 STMicroelectronics, STM32F103T8 Datasheet - Page 51

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STM32F103T8

Manufacturer Part Number
STM32F103T8
Description
Mainstream Performance line, ARM Cortex-M3 MCU with 64 Kbytes Flash, 72 MHz CPU, motor control, USB and CAN
Manufacturer
STMicroelectronics
Datasheet

Specifications of STM32F103T8

Conversion Range
0 to 3.6 V
Peripherals Supported
timers, ADC, SPIs, I2Cs and USARTs
STM32F103x8, STM32F103xB
Table 22.
HSE 4-16 MHz oscillator characteristics
Symbol
f
Oscillator frequency
OSC_IN
R
Feedback resistor
F
Recommended load capacitance
C
versus equivalent serial
resistance of the crystal (R
i
HSE driving current
2
g
Oscillator transconductance
m
(4)
t
startup time
SU(HSE
1. Resonator characteristics given by the crystal/ceramic resonator manufacturer.
2. Based on characterization, not tested in production.
3. The relatively low value of the RF resistor offers a good protection against issues resulting from use in a
humid environment, due to the induced leakage and the bias condition change. However, it is
recommended to take this point into account if the MCU is used in tough humidity conditions.
4. t
is the startup time measured from the moment it is enabled (by software) to a stabilized 8 MHz
SU(HSE)
oscillation is reached. This value is measured for a standard crystal resonator and it can vary significantly
with the crystal manufacturer
For C
and C
, it is recommended to use high-quality external ceramic capacitors in the
L1
L2
5 pF to 25 pF range (typ.), designed for high-frequency applications, and selected to match
the requirements of the crystal or resonator (see
same size. The crystal manufacturer typically specifies a load capacitance which is the
series combination of C
can be used as a rough estimate of the combined pin and board capacitance) when sizing
C
and C
. Refer to the application note AN2867 “Oscillator design guide for ST
L1
L2
microcontrollers” available from the ST website www.st.com.
Figure 23. Typical application with an 8 MHz crystal
Resonator with
integrated capacitors
1. R
value depends on the crystal characteristics.
EXT
Low-speed external clock generated from a crystal/ceramic resonator
The low-speed external (LSE) clock can be supplied with a 32.768 kHz crystal/ceramic
resonator oscillator. All the information given in this paragraph are based on characterization
results obtained with typical external components specified in
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).
Parameter
Conditions
R
(3)
)
S
V
= 3.3 V, V
DD
with 30 pF load
V
DD
and C
. PCB and MCU pin capacitance must be included (10 pF
L1
L2
C L1
OSC_IN
8 MH z
R F
resonator
OSC_OU T
R EXT (1)
C L2
Doc ID 13587 Rev 13
Electrical characteristics
(1) (2)
Min
Typ
4
8
200
= 30 Ω
30
S
= V
IN
SS
Startup
25
is stabilized
2
Figure
23). C
and C
are usually the
L1
L2
f HSE
Bias
controlled
gain
STM32F103xx
Table
23. In the application,
Max
Unit
16
MHz
pF
1
mA
mA/V
ms
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