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MEDIATEK MT3620 Hardware User's Manual

Secure wireless connectivity chip
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MediaTek MT3620
Secure Wireless Connectivity Chip
Hardware User Guide
Version:
v2.0
Release Date:
2019-02-19
© 2020 MediaTek Inc.
This document contains information that is proprietary to MediaTek Inc.
Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.
Specifications are subject to change without notice.

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Summary of Contents for MEDIATEK MT3620

  • Page 1 Release Date: 2019-02-19 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited. Specifications are subject to change without notice.

  • Page 2: Document Revision History

    Change List V2.0 2020/02/19 public release. MediaTek Confidential Page 2 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 3: Table Of Contents

    RF Layout Checklist ....................... 20 MediaTek Confidential Page 3 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.
  • Page 4 12.6 Reflow Profile Guideline ......................40 MediaTek Confidential Page 4 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 5: List Of Tables

    Table 9-3. Clock Routing and Layout Guidelines ..................32 MediaTek Confidential Page 5 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 6: List Of Figures

    Figure 11-12-4. Recommended signal pad solder paste stencil ..............39 MediaTek Confidential Page 6 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 7: System Overview

    MT3620 also includes over 5MB of embedded RAM, split among the various cores. There is a fully- integrated PMU and a real-time clock. Flash memory is integrated in the MT3620 package. Please refer to the “Codename 4x4 MT3620 Support Status”...

  • Page 8: Block Diagram

    Figure 5-1 MT3620 Block Diagram MediaTek Confidential Page 8 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 9: Pcb Stack Up And Impedance Control

    Perform resonance analysis on all plane cavities. MediaTek Confidential Page 9 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 10: Transmission Line

    Impedance matching should be guaranteed by the PCB manufacturer. MediaTek Confidential Page 10 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 11: Package Information

    Hardware User Guide Package Information MediaTek Confidential Page 11 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 12: Top Marking

    Hardware User Guide Top Marking MediaTek Confidential Page 12 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 13: Rf Front-End Circuit Design

    The 5GHz Wi-Fi transceiver radio integrates a balun, PA, LNA and T/R switch.  MediaTek Confidential Page 13 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 14: Wi-Fi Rf Auxiliary Path Front-End Schematic

    2.4GHz receive diversitity function. MediaTek Confidential Page 14 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 15: Rf Component Placement

    Figure 7-5 Matching Components Layout Placement  We stongly recommend you place RF matching circuits, including the main 2.4GHz, main 5GHz and auxiliarlly 5GHz paths, near the MT3620 chip as the figure shows below. MediaTek Confidential Page 15 of 40 ©...

  • Page 16: Rf Power Circuit Placement

    Figure 7-7 RF Power Rails MediaTek Confidential Page 16 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.
  • Page 17 Figure 7-9 AVDD_3V3_WF_A_TX Trace Routing Method MediaTek Confidential Page 17 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 18: Diversity

    In this case RF transceiving is fixed to the main path only, and does not use the auxilliary diversity  receive ports. MediaTek Confidential Page 18 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 19: Antenna Placement Guidelines For Antenna Diversity

    This is illustrated in the following diagram. MediaTek Confidential Page 19 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 20: Rf Layout Checklist

    0201 is better than 0402. MediaTek Confidential Page 20 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 21: Power Rails

    Hardware User Guide Power Rails MT3620 requires a regulated 3.3V power supply, for example from a DC-DC converter, to convert whatever source voltage rail is used to 3.3V. The MT3620 power management unit (PMU) contains an under-voltage lockout (UVLO) circuit, low drop-out regulators (LDOs), a highly efficient buck converter, a reference band-gap circuit and a voltage comparator for brown-out detection.

  • Page 22: Mt3620 Power Plan

    Hardware User Guide MT3620 Power Plan Internally to the MT3620, the 3.3V power source is directly supplied to the switching regulator, digital I/Os and RF related circuitry. It’s converted to 2.5V by the LDO for e-fuse and ADC analog circuitry, and it’s converted to 1.6V by the switching regulator for low voltage circuits.
  • Page 23 Figure 8-3 PMU Buck Ground Layout MediaTek Confidential Page 23 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 24: Pmu Buck 1.6V Supply Output

    According to above requirements, the power inductor MTK recommended is in following table. MediaTek Confidential Page 24 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 25: Pmu Ldo 2.5V Supply Output

    The trace width between 1uF and VOUT_2V5 pin (79) should be ≥ 0.38mm   Total capacitance recommend on 2.5V power rails: 2uF (near MT3620: 1uF, near usage : 1uF)  PCB trace parasitic resistance and inductance recommended to be below Trace define from VOUT_2V5 to C40 ...

  • Page 26: Pmu Ldo 1.15V Supply Output

    Several items should be noticed here: MediaTek Confidential Page 26 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.
  • Page 27 GND pins. MediaTek Confidential Page 27 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 28: Rtc Battery Supply

    The battery must be connected to the MT3620 via a Schottky diode circuit for isolation. The Schottky diode circuit allows the MT3620 RTC-well to be powered by the battery when the system power is not available, but by the system power when it is available. To do this, the diodes are set to be reversed biased when the system power is not available.
  • Page 29 R63 is included to limit the charging current to a safe level in the event D9B fails closed-  circuit. MediaTek Confidential Page 29 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 30: Power/Gnd Checklist

    Buck input capacitor should be close to the IC to reduce parasitic inductance. MediaTek Confidential Page 30 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 31: Clock

    Decoupling capacitor should be placed close to the device for each supply pin pair in the signal group. MediaTek Confidential Page 31 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 32: Xtal Routing Guide

    MediaTek Confidential Page 32 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.
  • Page 33 MediaTek Confidential Page 33 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 34: 10 Critical Components

    RFBLN1608050AM8T62 Walsin 1608 Approval -10~ +70 MediaTek Confidential Page 34 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 35: Diplexer

    2.4/5GHz DPX 1608 Approval 8018A1 MediaTek Confidential Page 35 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 36: 11 Boot Strapping Pins

    Hardware User Guide 11 Boot Strapping Pins Immediately after coming out of reset, the MT3620 senses the state of a number of ‘strapping’ pins to configure various internal sub-systems of the chip. The following table provides details of which pins are used for strapping, along with their function and default state.

  • Page 37: 12 Smt Guidelines

    0.125 mm MediaTek Confidential Page 37 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 38: E-Pad Pcb Footprint

    Figure 11-12-2. Recommended E-pad solder paste stencil MediaTek Confidential Page 38 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 39: Signal Pad Pcb Footprint

    Figure 11-12-4. Recommended signal pad solder paste stencil MediaTek Confidential Page 39 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

  • Page 40: Mediatek Confidential © 2020 Mediatek Inc

    60~120 sec 6°C/sec max 3°C/sec MediaTek Confidential Page 40 of 40 © 2020 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

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