Figure 14. Clock And Reset - STMicroelectronics SPC58NHADPT302S User Manual

32 kHz oscillator
C81
R36 0R
VSS_OSC
10pF
50V
J20
R38
1 2
0R
STRIP2PMD-2MM-O
R39
DNM
J21
1 2
Y2
32.768 KHz
STRIP2PMD-2MM-O
C83
VSS_OSC
10pF
50V
Reset circuit
VDD_HV_IO_MAIN
R45 R46
10K 560R
SW1
Pushbutton
GND
RST-SW
RST-SW
Figure 14. Clock and reset
External oscillator
C80
8pF
PB4
50V
R37
Y1
DNM
40MHz
PB4-XTAL32
C82
R40
0R
8pF
50V
PE14-EXTAL32
VSS_OSC
Loop Controlled Pierce
Oscillator Circuit
R41
DNM
PE14
REMOVE XTAL jumper when driving EXTAL from
Oscillator Module or External Source
Connect XTAL jumper to GND when driving EXTAL from
Oscillator Module or External Source
5
VDD_HV_IO_MAIN
USR RESET LED
74LVC125AMTR
D1 Yellow
R47
4K7
Vcc J24
2 3 1 2
RST-MCU
GND STRIP2PMD-2MM
GND Reset-In
U6A
Disable
74LVC125AMTR
9
GND
GND
External clock input
J17
3
EVB_EXTAL
2
EXTAL
1
Note -
STRIP3PMD-2MM
Internal
Pull-Up on
Pin 1
J19
3
2
XTAL
1
STRIP3PMD-2MM
GND
GND
P1
SMA-FEM-180
1
SMA style 2
Connector
GND
VDD_HV_IO_MAIN
R43
4K7
Vcc J23
6 1 2 ESR0
ESR0
STRIP2PMD-2MM
GND
U6B
MCU RESET LED
R44
560R D2
Red
1
VCC
4
2
GND
U7
74V1G08STR
GND
Vcc J25
8 1 2 PORST
PORST
GND STRIP2PMD-2MM
R48
U6C
VDD_HV_IO_MAIN
4K7
74LVC125AMTR
3.3V_SR
C79 100nF 50V J18
1 2
STRIP2PMD-2MM-O
Note - External 3.3V
U5
regulator MUST be
8MHz
1 4
enabled when using
EN +Vs
oscillator module
2 3
GND OUT
J22
OSC-MOD 1
2
EVB_EXTAL
3
EXTAL-SMA
STRIP3PMD-2MM
R42 50R
LEGEND
NORMAL TRACE
50 OHM TRACE
50 OHM SAME LENGHT TRACE
AS SHORT AS POSSIBLE TRACE