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STM32MP157D 데이터시트(PDF) 153 Page - STMicroelectronics

부품명 STM32MP157D
상세설명  Arm® dual Cortex®-A7 800 MHz Cortex®-M4 MPU, 3D GPU, TFT/DSI, 37 comm. interfaces, 29 timers, adv. analog
PDF  259 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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STM32MP157D 데이터시트(HTML) 153 Page - STMicroelectronics

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STM32MP157A/D
Electrical characteristics
237
Note:
For information on selecting the crystal, refer to the application note AN2867 “Oscillator
design guide for ST microcontrollers” available from the ST website www.st.com.
Figure 20. Typical application with a 32.768 kHz crystal
1. Adding an external resistor between OSC32_IN and OSC32_OUT is forbidden.
Table 34. Low-speed external user clock characteristics(1)
Symbol
Parameter
Operating conditions(2)
Min
Typ
Max
Unit
F
Oscillator frequency
-
-
32.768
-
kHz
IDD
LSE current
consumption
LSEDRV[1:0] = 00,
Low drive capability
-290
-
nA
LSEDRV[1:0] = 01,
Medium Low drive capability
-390
-
LSEDRV[1:0] = 10,
Medium high drive capability
-550
-
LSEDRV[1:0] = 11,
High drive capability
-900
-
Gmcritmax
Maximum critical crystal
gm
LSEDRV[1:0] = 00,
Low drive capability
--
0.5
µA/V
LSEDRV[1:0] = 01,
Medium Low drive capability
-
-
0.75
LSEDRV[1:0] = 10,
Medium high drive capability
--
1.7
LSEDRV[1:0] = 11,
High drive capability
--
2.7
tSU(3)
Startup time
VDD is stabilized
-
2
-
s
1. Guaranteed by design.
2. Refer to the note and caution paragraphs below the table, and to the application note AN2867 “Oscillator design guide for
ST microcontrollers.
3. tSU is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 k Hz oscillation is
reached. This value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer.
ai17531c
STM32
OSC32_OUT
fHSE
CL1
RF
32.768 kHz
resonator
Bias
controlled
gain
OSC32_IN
CL2
Resonator with
integrated capacitors



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