NetduinoPlus2 Netduino, NetduinoPlus2 Datasheet - Page 92

• Manufacturer Part Number: NetduinoPlus2
• Description: Development Boards & Kits - ARM NETDUINO PLUS 2
• Manufacturer: Netduino

Specifications of NetduinoPlus2

• Rohs: yes
• Product: Development Boards
• Tool Is For Evaluation Of: STM32F405RG
• Core: ARM Cortex M4
• Interface Type: I2C, SPI, UART, USB
• Operating Supply Voltage: 7.5 v to 9 V
• Data Bus Width: 32 bit
• Description/function: Arduino form factor
• Dimensions: 2.8 in x 2.1 in
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C

Electrical characteristics
Note:
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Table 30.
1. Resonator characteristics given by the crystal/ceramic resonator manufacturer.
2. Based on characterization, not tested in production.
3. t
For C
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
For information on electing the crystal, refer to the application note AN2867 “Oscillator
design guide for ST microcontrollers” available from the ST website www.st.com.
Figure 30. Typical application with an 8 MHz crystal
1. R
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).
t
SU(HSE
Symbol
L1
f
OSC_IN
oscillation is reached. This value is measured for a standard crystal resonator and it can vary significantly
with the crystal manufacturer
SU(HSE)
I
R
g
and C
DD
EXT
m
F
L1
Resonator with
integrated capacitors
(3)
value depends on the crystal characteristics.
and C
is the startup time measured from the moment it is enabled (by software) to a stabilized 8 MHz
L2
Oscillator frequency
Feedback resistor
HSE current consumption
Oscillator transconductance
Startup time
.
HSE 4-26 MHz oscillator characteristics
L2
, it is recommended to use high-quality external ceramic capacitors in the
C L2
C L1
Parameter
L1
and C
8 MH z
resonator
R
EXT
Doc ID 022152 Rev 3
(1)
L2
. PCB and MCU pin capacitance must be included (10 pF
OSC_OU T
OSC_IN
C
C
L
V
R F
L
=10 pF@25 MHz
=5 pF@25 MHz
DD
ESR= 30 Ω,
ESR= 30 Ω,
Conditions
V
V
Figure
DD
DD
Startup
is stabilized
controlled
=3.3 V,
=3.3 V,
Bias
gain
(1) (2)
30). C
STM32F405xx, STM32F407xx
Table
L1
STM32F
and C
Min
4
5
-
-
-
-
31. In the application,
f HSE
L2
Typ
200
449
532
2
are usually the
-
-
Max
26
-
-
-
-
-
ai17530
mA/V
MHz
Unit
ms
kΩ
µA