Table of Contents
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Introduction
The purpose of this handbook is to help the system designers who implement hardware such as power
supply, clock management, reset control, boot mode setting, and debug interfaces on the development
board.
Specifically, this document provides hardware design guidelines to optimize the performance of user
applications and minimize noise transmitted from the outside to the PCB.
This handbook applies to the products with part numbers listed in Table 1.
Base Product
A31G112GR, A31G112KN, A31G112KU, A31G112KY, A31G112LU, A31G112SQ,
A31G11x
A31G112CL, A31G111GR, A31G111KN, A31G111KU, A31G111LU
A31G123ML, A31G123MM, A31G123RL, A31G123RM, A31G123RN, A31G123SQ,
A31G12x
A31G123CL, A31G122ML, A31G122MM, A31G122RL, A31G122RM
A31G213CL, A31G213SQ, A31G213KN, A31G213GR,
A31G21x
A31G212CL, A31G212SQ, A31G212KN, A31G212GR
A31G226ML, A31G226MM, A31G226RM, A31G226RL, A31G226RL
A31G22x
A31G224ML, A31G224MM, A31G224RM, A31G224RL, A31G224RL
A31G316MM, A31G316ML, A31G316RM, A31G316RL, A31G314MM,
A31G31x
A31G314ML, A31G314RM, A31G314RL, A31G314CL, A31G314CU,
A31G314SN, A31G313RM, A31G313RL, A31G313CL, A31G313CU, A31G313SN
A31G32x
A31G323CL, A31G323RL, A31G324CL, A31G324CU, A31G324RL
A33G527RL, A33G527VL, A33G527VQ,
A33G52x
A33G526MM, A33G526RL, A33G526RM, A33G526VL, A33G526VQ,
A33G524ML, A33G524MM, A33G524RL, A33G524RM, A33G526ML
A33G539VQ, A33G539VL, A33G539MM, A33G539RL
A33G53x
A33G538VQ, A33G538VL, A33G538MM, A33G538RL
A31T216RL, A31T216CL, A31T216SN,
A31T21x
A31T214RL, A31T214CL, A31T214SN
A31M22x
A31M223CL, A31M223KN, A31M223GR
A33M116RL, A33M116RM, A33M116CL,
A33M11x
A33M114RL, A33M114CL
A34M418YL, A34M418VL, A34M418RL,
A34M41x
A34M416VL, A34M416RL,
A34M414VL, A34M414RL
A34M420
A34M420YL, A34M420VL, A34M420RL
A34L716
A34L716VL, A34L716RL, A34L716JY
AC30M1x64
AC30M1464LBN, AC30M1364LBN, AC30M1364UB
AC33Mx064
AC33M4064(T), AC33M3064(T)
AC33Mx128
AC33M8128, AC33M8128L, AC33M6128L
Hardware Design Guide for Noise Immunity
Table 1. Applicable Devices
Global Top Smart MCU Innovator, ABOV Semiconductor
www.abovsemi.com
32-bit Microcontroller
Part Number
Handbook
HB Rev. 1.04
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Related Manuals for Abov A31G11 Series
Summary of Contents for Abov A31G11 Series
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Page 1: Introduction
A33M116RL, A33M116RM, A33M116CL, A33M11x A33M114RL, A33M114CL A34M418YL, A34M418VL, A34M418RL, A34M41x A34M416VL, A34M416RL, A34M414VL, A34M414RL A34M420 A34M420YL, A34M420VL, A34M420RL A34L716 A34L716VL, A34L716RL, A34L716JY AC30M1x64 AC30M1464LBN, AC30M1364LBN, AC30M1364UB AC33Mx064 AC33M4064(T), AC33M3064(T) AC33Mx128 AC33M8128, AC33M8128L, AC33M6128L Global Top Smart MCU Innovator, ABOV Semiconductor www.abovsemi.com... -
Page 2: Reference Document
Reference Document 32-bit Microcontroller Handbook Reference Document The following documents are available on www.abovsemi.com. Datasheets for the 32-bit microcontrollers shown in Table 1. User’s Manuals for the 32-bit microcontrollers shown in Table 1. -
Page 3: Table Of Contents
32-bit Microcontroller Handbook Contents Contents Introduction.............................. 1 Reference Document ..........................2 Filter and Bypass Capacitor ......................6 Filter Capacitor: EC1 (Electrolytic Capacitor) ..............6 Bypass Capacitor: C1 and C2 ..................... 7 Reset Pin ............................9 Filters Used on a Reset Pin ....................9 Boot Pin ............................ - Page 4 List of Tables 32-bit Microcontroller Handbook List of Tables Table 1. Applicable Devices ........................1 Table 2. Filter and Bypass Component Value ..................8 Table 3. Reset Pin Component Value ..................... 9 Table 4. Boot Pin Component Values ....................10 Table 5.
- Page 5 32-bit Microcontroller Handbook List of Figures List of Figures Figure 1. Filter and Bypass Capacitor Design Diagram ................8 Figure 2. Examples of Bypass Capacitor Placement ................8 Figure 3. Filters Used on a Reset Pin Diagram ..................9 Figure 4. Pull-Up and Pull-Down Resistor Used on a Boot Pin Diagram ..........10 Figure 5.
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Page 6: Filter And Bypass Capacitor
1. Filter and Bypass Capacitor 32-bit Microcontroller Handbook Filter and Bypass Capacitor Filter Capacitor: EC1 (Electrolytic Capacitor) To reduce external noise, such as EFT, it is recommended to place a capacitor at a power source. When using an electrolytic capacitor with leads, the Equivalent Series Inductance (ESL) and Equivalent Series Resistance (ESR) values are typically high, resulting in a lower Self Resonant Frequency (SRF). -
Page 7: Bypass Capacitor: C1 And C2
32-bit Microcontroller Handbook 1. Filter and Bypass Capacitor Bypass Capacitor: C1 and C2 To reduce high-frequency noise, it is recommended to place ceramic capacitors at a power source. For decoupling purposes, two a hundred times different capacitors can be used instead of 100 nF capacitor. -
Page 8: Table 2. Filter And Bypass Component Value
1. Filter and Bypass Capacitor 32-bit Microcontroller Handbook Table 2. Filter and Bypass Component Value Item Component Value 10 nF to 100 nF Bypass capacitor (decoupling) 100 times capacitance of C1 Filter capacitor Typ. 22 μF Figure 1. Filter and Bypass Capacitor Design Diagram MCU IC MCU IC Insert... -
Page 9: Reset Pin
32-bit Microcontroller Handbook 2. Reset Pin Reset Pin Filters Used on a Reset Pin For stable operations, resistors and capacitors must be placed on a reset pin, regardless of whether a reset pin is used. A circuit selection should carefully consider the characteristics of the reset pin. Table 3. -
Page 10: Boot Pin
3. Boot Pin 32-bit Microcontroller Handbook Boot Pin Pull-Up / Pull-Down Resistor on a Boot Pin For stable operations, resistors must be placed on a boot pin, regardless of whether a boot pin is used. Do not connect a filter capacitor to the boot pin. Depending on the device, the boot pins may have different configurations of pull-up or pull-down resistor. -
Page 11: External Clock
32-bit Microcontroller Handbook 4. External Clock External Clock GND Shielding When using an external clock source, such as a crystal oscillator or ceramic resonator, it is recommended to create a ground shielding pattern (also known as a ground guard) around the clock source’s XIN and XOUT lines. -
Page 12: Reduce External Noise
4. External Clock 32-bit Microcontroller Handbook Reduce External Noise To improve the immunity to external noise of XTAL, you can select the current capability and noise filter of HSE (XTAL) and LSE (Sub-XTAL) in the EOSCR register of SCU (System Control Unit). -
Page 13: Debugging Interface
5. Debugging Interface Debugging Interface JTAG Interface JTAG interface is used for downloading and debugging the ABOV 32-bit microcontroller. Table 8 shows a list of devices that support the JTAG interface. − When using the JTAG interface, a pull-up or pull-down resistor must conform to the specifications shown in Table 8. -
Page 14: Jtag Interface Design
5. Debugging Interface 32-bit Microcontroller Handbook JTAG Interface Design 5.1.1 Figure 6. JTAG Interface Example: A33G52x, A33G53x 1. The length of power line between a microcontroller and pull-up resistors must be shorter than 10 mm. 100 nF Power line for pull-up resistors Length 10mm JTAG interface... -
Page 15: Swd (Serial Wire Debug) Interface
32-bit Microcontroller Handbook 5. Debugging Interface SWD (Serial Wire Debug) Interface SWD interface is used for downloading and debugging the ABOV 32-bit microcontroller. Table 9 shows a list of devices that support the SWD interface. When using the SWD interface, pull-up/pull-down resistors must conform to the specifications shown in Table 9. -
Page 16: Swd Interface Design
5. Debugging Interface 32-bit Microcontroller Handbook Suppose the power connection of the pull-up resistor is located more than 10 mm away from microcontroller’s VDD power. In that case, it is recommended to add a 0.1 μF bypass capacitor between the microcontroller’s VDD pin and ground. It is also important to ensure a strong connection between the ground pin of the bypass capacitor and the ground pin of the microcontroller. -
Page 17: Adc Input
32-bit Microcontroller Handbook 6. ADC Input ADC Input Power Selection If a microcontroller has separate analog power (AVDD and AVSS) and digital power (VDD and VSS) pins, it is recommended to use analog power for the circuit design. When a microcontroller supports single power internally, it is advisable to use a single power source. -
Page 18: I2C Line
7. I2C Line 32-bit Microcontroller Handbook I2C Line Filters used on I2C Line Pull-up resistors, series resistors, and filter capacitors can be used to implement filters on the I2C lines. To achieve optimal performance, the placement and order of filter components are crucial. Adding a series resistor can help reduce noise, while a filter capacitor can effectively bypass noise to GND. -
Page 19: Unused Pin
32-bit Microcontroller Handbook 8. Unused Pin Unused Pin Handling Unused Pin To improve the noise immunity and robustness of a microcontroller, it is recommended to terminate all unused pins properly by connecting them to each pull-down resistor. Resistors should be placed as close to a microcontroller as possible (within 20 mm). ... -
Page 20: Power Line
9. Power Line 32-bit Microcontroller Handbook Power Line Filter Circuit for Power Line Filter circuits implemented on power lines may enhance board performance in cases of failure. Filters Used on a Microcontroller Power Input Filter components (L1 and L2) must be placed close to noise sources (e.g., within 30 mm of the power pins) rather than close to a microcontroller. -
Page 21: Via Connection
32-bit Microcontroller Handbook 10. Via Connection Via Connection Case 1: Via Connection to Power and Ground Plane 10.1 In circuit board design, vias can be utilized to connect a bypass and filter capacitor from one layer to the power or ground plane in another layer. At this point, traces connecting the capacitor through the via create a single inductance −... -
Page 22: Case 2: Via Connection To Exposed Pad (Ep) Of A Microcontroller
10. Via Connection 32-bit Microcontroller Handbook Case 2: Via Connection to Exposed Pad (EP) of a Microcontroller 10.2 Packages such as Quad Flat No-lead (QFN) often have Exposed Pads (bottom pads) that are typically connected to the ground. To ensure a low impedance path to ground, it is recommended to place as many vias as possible on the EP pin. -
Page 23: Case 3: Via Fences
32-bit Microcontroller Handbook 10. Via Connection Case 3: Via Fences 10.3 The ground vias should be arranged at a consistent distance (typ. 5 mm pitch) from each other within the boundaries of the board. The ground vias should be placed at a consistent distance on the internal GND pattern. Following step 1 and step 2 may reduce external noise and Electromagnetic Interferences (EMI) emission. -
Page 24: Component Placement
11. Component Placement 32-bit Microcontroller Handbook Component Placement Component Placement Guidelines 11.1 When placing components, you must divide the components into digital and analog components based on a reference point. The reference point is typically the point of power supply, which is the ‘Connector’... -
Page 25: Power Line Routing
32-bit Microcontroller Handbook 12. Power Line Routing Power Line Routing Case 1: Basic Routing for Power Lines (VDD and GND) 12.1 To minimize current loops on PCB layouts, it is advisable to use wider or thicker traces in parallel without jumpers. It is recommended to fill the ground with a copper pattern. ... -
Page 26: Figure 17. Single-Layer Board Design Diagram
12. Power Line Routing 32-bit Microcontroller Handbook Figure 17 shows a design case of single layer PCB board. Figure 17. Single-Layer Board Design Diagram 1. Power lines (VDD and ground) are routed close to and parallel to each other without jumpers. Connector VDD (Yellow) GND (Brown) -
Page 27: Case 2: Branch Of Power Lines
32-bit Microcontroller Handbook 12. Power Line Routing Case 2: Branch of Power Lines 12.2 Prior to routing, power lines must be filtered to reduce noise. In Figure 18, the poor case shows a power line that is not filtered by EC1 (filter capacitor), making it susceptible to external noise. -
Page 28: Revision History
Revision History 32-bit Microcontroller Handbook Revision History Revision Date Notes 1.00 Mar. 29, 2023 Initial release 1.01 Apr. 19, 2023 Added A31M22x device. 1.02 Oct. 24, 2023 Added A33G53x device. 1.03 Aug. 07, 2024 Added A34M420 and A34L716 devices. 1.04 Nov. - Page 29 ABOV Semiconductor ("ABOV") reserves the right to make changes, corrections, enhancements, modifications, and improvements to ABOV products and/or to this document at any time without notice. ABOV does not give warranties as to the accuracy or completeness of the information included herein. Purchasers should obtain the latest relevant information of ABOV products before placing orders.
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