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ST STM32U3 manual available for free PDF download: Application Note
ST STM32U3 Application Note (38 pages)
Brand:
ST
| Category:
Computer Hardware
| Size: 1 MB
Table of Contents
General Information
2
Power Supply Management
3
Power Supplies
3
Figure 1. Stm32U375Xx and Stm32U385Xx Power Supply Overview (Without SMPS)
4
Independent Analog Peripherals Supply
5
Figure 2. Stm32U375Xxxxq and Stm32U385Xxxxq Power Supply Overview (with SMPS)
5
Independent I/O Supply Rail
6
Independent USB Transceiver Supply
6
Battery Backup Domain
6
Voltage Regulator
7
Power Supply for I/O Analog Switches
8
Power Supply Schemes
8
Figure 3. Power Supply Scheme for Stm32U375/385Xxxxq (with SMPS)
9
Dda , V Ddusb , V Ddio2 DD
10
Power Supply Sequence between
10
Power Supply Isolation
10
Figure 4. Power Supply Scheme for Stm32U375/385Xx (Without SMPS)
10
General Requirements
11
Particular Conditions During the Power-Down Phase
11
Figure 5. Power-Up/Power-Down Sequence
11
Reset and Power-Supply Supervisor
12
Brownout Reset (BOR)
12
System Reset
12
Figure 6. Brownout Reset Waveform
12
Backup Domain Reset
13
Figure 7. Simplified Diagram of the Reset Circuit
13
Packages
14
Package Summary
14
Table 1. Package Summary for STM32U3 Devices
14
Pinout Summary
15
Table 2. Pinout Summary for STM32U3
15
Clocks
17
HSE Clock
17
Table 3. HSE/LSE Clock Sources
17
External Source (HSE Bypass)
18
HSI16 Clock
18
MSI (MSIS and MSIK) Clocks
18
LSE Clock
18
Boot Configuration
19
Boot Mode Selection
19
Table 4. Boot Modes When Trustzone ® Is Disabled (TZEN = 0)
19
Embedded Bootloader and RSS
20
Table 5. Boot Modes When Trustzone ® Is Enabled (TZEN = 1)
20
Debug Management
21
SWJ-DP (Serial-Wire and JTAG Debug Port)
21
Pinout and Debug Port Pins
21
SWJ-DP Pins
21
Table 6. Debug Port Pin Assignment
21
Figure 8. Host-To-Board Connection
21
Flexible SWJ-DP Pin Assignment
22
Internal Pull-Up and Pull-Down Resistors on JTAG Pins
22
Table 7. SWJ-DP I/O Pin Availability
22
SWD Port Connection with Standard JTAG Connector
23
Serial-Wire Debug (SWD) Pin Assignment
23
Internal Pull-Up and Pull-Down on SWD Pins
23
Table 8. SWD Port Pins
23
Figure 9. JTAG Connector Implementation
23
Design Recommendations
24
PCB (Printed Circuit Board)
24
Component Position
24
Ground and Power Supply
24
Decoupling
24
Other Signals
25
Unused I/Os and Features
25
Figure 10. Typical Layout for VDD/VSS Pin Pair
25
Reference Design
26
Description
26
Design Reference for a STM32U3 Device (with and Without SMPS)
27
Table 9. Components of STM32U3 Reference Design
27
Figure 11. Stm32U375/385Xxxxq Reference Design (with SMPS)
28
Figure 12. Stm32U3Xxxx Reference Design (Without SMPS)
29
Recommended PCB Routing Guidelines
30
PCB Stack-Up
30
Crystal Oscillator
30
Power Supply Decoupling
30
Figure 13. Four Layer PCB Stack-Up Example
30
Figure 14. Six Layer PCB Stack-Up Example
30
High Speed Signal Layout
31
SDMMC Bus Interface
31
Figure 15. Decoupling Capacitor Placement Depending on Package Type
31
Octal Serial Peripheral Interface (OCTOSPI)
32
Embedded Trace Macrocell (ETM)
32
Revision History
33
Table 10. Document Revision History
33
Table of Contents
34
List of Tables
36
List of Figures
37
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