Airoha MT7682 HDK V11 User manual

MT7682 HDK V11 User's Guide
Version: 1.4
Release date: 21 May 2018
© 2017 Airoha Technology Corp.
This document contains information that is proprietary to Airoha Technology Corp. (“Airoha”) and/or its licensor(s). Airoha cannot grant you
permission for any material that is owned by third parties. You may only use or reproduce this document if you have agreed to and been
bound by the applicable license agreement with Airoha (“License Agreement”) and been granted explicit permission within the License
Agreement (“Permitted User”). If you are not a Permitted User, please cease any access or use of this document immediately. Any
unauthorized use, reproduction or disclosure of this document in whole or in part is strictly prohibited. THIS DOCUMENT IS PROVIDED ON AN
“AS-IS” BASIS ONLY. AIROHA EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES OF ANY KIND AND SHALL IN NO EVENT BE LIABLE FOR ANY
CLAIMS RELATING TO OR ARISING OUT OF THIS DOCUMENT OR ANY USE OR INABILITY TO USE THEREOF. Specifications contained herein are
subject to change without notice.

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Document Revision History
Revision Date Description
1.0 5 May 2017 Initial release
1.1 30 June 2017 •Updated the HDK board version to V11.
•Corrected XTAL frequency to 26MHz.
•Added power jumper setting configuration description.
•Corrected extension connector pin definitions.
1.2 30 Oct 2017 •Added jumper pin J2009,SW3001 description
•Modified external input voltage (Vin) range
•Corrected the number of LEDs
•Added a note at extension connector
•Added jumper setting at chapter 2.4
1.3 5 Jan 2018 •Add chapter 2.5 for entering IAR and GCC interface
1.4 21 May 2018 •Updated HDK picture for jumper settings

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Table of Contents
1. Introduction........................................................................................................................................... 4
2. Get started with the HDK....................................................................................................................... 5
2.1. Configuring the MT7682 HDK.............................................................................................................5
2.2. Installing the MT7682 HDK drivers on Microsoft Windows ...............................................................6
2.3. Configuring the HDK flash mode ........................................................................................................7
2.4. Downloading the image using the MT7682 HDK as a removable storage .........................................8
2.5. Enter IAR and GCC development interface.........................................................................................8
3. Hardware Features ...............................................................................................................................10
4. Hardware Feature Configuration ..........................................................................................................11
4.1. Microcontroller.................................................................................................................................11
4.2. Power supply ....................................................................................................................................11
4.3. LEDs ..................................................................................................................................................12
4.4. Buttons .............................................................................................................................................13
4.5. Extension connectors .......................................................................................................................14
4.6. RTC....................................................................................................................................................17
4.7. RF connections..................................................................................................................................17
4.8. CMSIS-DAP Firmware update procedure .........................................................................................18
1. Schematics (V11) ..................................................................................................................................19

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Lists of Tables and Figures
Table 1. Jumper settings for system power input through USB connection.........................................................11
Table 2. System power input from AA or AAA battery jumpers ...........................................................................12
Table 3. GPIO pins to activate the LEDS................................................................................................................13
Table 4. GPIO pin-out extension connectors ........................................................................................................14
Table 5. GPIO pin multi-function definition ..........................................................................................................14
Figure 1. Front view of MT7682 HDK ......................................................................................................................4
Figure 2. Jumpers and connectors on the MT7682 HDK.........................................................................................5
Figure 3. COM port associated with the MT7682 HDK ...........................................................................................7
Figure 4. New removable storage detected............................................................................................................8
Figure 5. Switch j2107, j2108 and j2201 to enter IAR and GCC interface. ..............................................................9
Figure 6. Power up the HDK using two AA or AAA Battery (J2001) ......................................................................12
Figure 7. On-board LEDs........................................................................................................................................13
Figure 8. Location of the components C17 and C18 .............................................................................................18

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1. Introduction
Airoha IoT SDK for RTOS is a low-cost and easy to use Internet of Things (IoT) development platform to design,
prototype, evaluate and implement IoT projects. The platform supports MT7682 hardware development kit (HDK).
This user manual provides required knowledge on features of the HDK, including the pins, communication
interfaces, core microcontroller unit (MCU) description, the networking capabilities and how to use them through
the host driver.
The HDK includes MT7682 chipset which is based on ARM Cortex-M4 with floating point unit in QFN40 package. It
enables rich connectivity features, communication with cloud services and real-time control. The MT7682 HDK
supports ARM mbed IoT Device Platform for more convenient debugging and binary code download operations.
The following features are available:
•Mass storage device (MSD) programmer.
oThe MT7682 HDK has three binary files for bootloader, Wi-Fi connectivity and FreeRTOS. The MSD
programmer enables to update the FreeRTOS binary file only.
•Coresight Debug Access Port (CMSIS-DAP)debug interface.
oA firmware debug interface similar to ST-link or J-link. It enables debugging a target project or
downloading a binary to the flash storage of the device.
•Virtual Serial Port.
oSupports UART functionality, such as transferring log information from the HDK.
These features are used to download and debug a project on MT7682 HDK.
The front view of the HDK including a stamp module and main board is shown in Figure 1. MT7682 and MT7686
use the same HDK main board.
Figure 1. Front view of MT7682 HDK

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2. Get started with the HDK
Before commencing the application development, you need to configure the development platform.
2.1. Configuring the MT7682 HDK
MT7682 HDK includes a main board (MT7686 Main Board_V11) and a MT7682 stamp module. The MT7682 stamp
module is mounted on the main board. The pin description of the MT7682 HDK is shown in Figure 2.
J2103
Left to Right
J2108
J2107
SMA Connector
for Wi-Fi antenna
J2201
J2101
SW3001
Top to Bottom
J2007
J2004
Left to Right
J2002
J2003
J2009
Left to Right
S2006(RTC_EINT)
S2005(EINT)
S2001(RST)
CON3001
Figure 2. Jumpers and connectors on the MT7682 HDK
The description of pins (Figure 2) and their functionality is provided below.
1) CON3001 is a USB connector to debug through UART, transmit and receive a signal and supply power
from the PC. The USB connectivity with the PC is supported by the on-board MK20DX128VFM5.
a) Set the jumpers J2002 pin1 and pin 2, J2003 pin 1 and pin 2, J2004 and J2007 on, if the board is
powered by a USB connector.
2) S2005 enables the external interrupt (configured at GPIO0) see section 4.4, “Buttons”.
3) Press S2001 to reset the system.
4) Wi-Fi Antenna is a PCB antenna. MT7682 stamp module is by default connected to the PCB antenna to
transmit and receive RF signals.
The default configuration of the MT7682 HDK supports the following functionality:
1) Power supply. Attach a micro-USB connector to the CON3001.
2) Supports RTC interrupt.

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3) Clock source — 32.768kHz source crystal clock for the RTC mode or external clock operating on 32.768
kHz.
4) XTAL at 26MHz.
5) Supports RTC mode.
The hardware settings of the stamp module are shown below:
1) XTAL at 26MHz.
2) Clock source — 32.768kHz source crystal clock for the RTC mode or external clock operating at 32.768kHz.
3) Supports RTC mode.
2.2. Installing the MT7682 HDK drivers on Microsoft Windows
To configure the MT7682 HDK:
1) Connect the HDK to the computer using a micro-USB cable.
2) Download and install mbed Windows serial port driver from here. Open Windows Control Panel then
click System and:
•On Windows 7 and 8, click Device Manager.
3) In Device Manager, navigate to Ports (COM & LPT) (see Figure 3).
4) A new COM device should appear under Ports (COM & LPT) in Device Manager, as shown in Figure
3. Note the COMx port number of the serial communication port, this information is needed to send
command and receive logs from the COM port. Virtual COM port is connected to the board through the
UART0 of the MT7682, see section 4.5, “ Extension connectors”. The mbed Serial Port (UART0) is
applied to flash the board and log the outputs.

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Figure 3. COM port associated with the MT7682 HDK
2.3. Configuring the HDK flash mode
The MT7682 HDK is embedded with 1MB flash memory. The boot options are either from the Flash memory or
from the UART port.
To update the firmware on the MT7682 HDK:
1) Set the jumpers J2002 pin 1 and pin2, J2003 pin 1 and pin2, J2004 and J2007 on.
2) To enable the chipset to UART download mode, set the jumper J2201 pin 2 and pin 3 on.
•In this mode, if the power is on, the board will load ROM code and start the ATE Daemon or Firmware
Upgrade Daemon according to the MT7682 Flash Tool’s behavior on the PC. A message is sent to the
UART0port of the chipset and the code is uploaded to the embedded flash memory through UART0.
3) Connect the board to the computer using a micro-USB cable.
The development board should now be connected to the PC, as shown in Figure 2.
To run the project on the MT7682 HDK:
1) Set the jumpers J2002 pin 1 and pin 2, J2003 pin 1 and pin 2, J2004 and J2007 on.
2) Remove J2201 jumper, to set the board into a flash mode.
•In this mode, if the power is on, the board will load firmware from the Flash and reboot.
3) Connect the board to a computer using a micro-USB cable.

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The development board should now be connected to the PC, as shown in Figure 4.
2.4. Downloading the image using the MT7682 HDK as a removable storage
To update the FreeRTOS binary only (example project binary: mt7682_iot_sdk.bin), use the HDK as a mass
storage device according to the following steps:
1) Set the jumpers J2107 pin 2 and pin 3, J2108 pin2 and pin 3 on.
2) Power up the board with a micro-USB cable.
3) Navigate to Computer on your PC to check if a new mass storage named MT7682 is available under
Removable Disk, as shown in Figure 4.
4) Open the MT7682 removable storage, then drag and drop the binary mt7682_iot_sdk.bin to
complete downloading the image.
Figure 4. New removable storage detected
2.5. Enter IAR and GCC development interface
MT7682 HDK support IAR and GCC development interface to design or debug.
According to the following steps to enter these interfaces:
1) Set the jumpers J2107 pin 2 and pin 3, J2108 pin2 and pin 3 on.
2) Set the jumpers J2201 pin1 and pin2 on.
3) Power up the board with a micro-USB cable.
4) Use computer to enter the IAR and GCC software.

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Figure 5. Switch j2107, j2108 and j2201 to enter IAR and GCC interface.

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3. Hardware Features
This section provides the main supported features of the MT7682 HDK. The detailed description of the features is
provided in the upcoming sections.
•IEEE 802.11bgn Wireless Connectivity Single Chip with QFN40 package.
•The IOs on MT7682 HDK are 3.3V compatible. MT7682 chip IO can support 3.3V, 2.8V and 1.8V.
•Support for FreeRTOS.
•Flexible on-board power supply
oUSB with power (V
Bus, 5V).
oExternal V
IN (1.8~3.63V).
•Eight LEDs
oPower LEDs (D2001, D2002).
oUser LEDs (D1, D2, D3, D4, D5).
oUART communication LEDs(LED3001)
•Three push buttons
oSystem Reset.
oReal Time Clock (RTC) Interrupt.
oExternal Interrupt.
•XTAL (Crystal Oscillator)
o26MHz source clock support with low power consumption in idle mode.
o32.768kHz clock for the RTC mode or external 32.768kHz mode.
•USB re-enumeration capability: two different interfaces supported on the same USB.
oCMSIS-DAP USB.
oVirtual COM port UART through USB on PC.
•On-board chip antenna with U.FL for conducted testing.
•Micro USB connector for power and debug connections.
•Headers for current measurement.

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4. Hardware Feature Configuration
4.1. Microcontroller
MT7682 features an ARM Cortex-M4 with floating point processor, which is the most energy efficient ARM
processor available.
MT7682 provides low power consumption embedded architecture and it’s optimized for various types of
applications in home automation, smart grid, handheld devices, personal medical devices and industrial control
that have lower data rates, and transmit or receive data on an infrequent basis.
4.2. Power supply
MT7682 HDK supports two types of power supply.
1) Power up with a micro-USB connector.
An on-board switching regulator provides voltage of 3.3V for the MT7682 HDK based on MT7682, if the power is
supplied from an on-board micro-USB connector CON3001 (Figure 2). This supply can be isolated from the
switching regulator using the jumpers. Note, that the jumpers J2002 pin 1 and 2, J2003 pin 1 and 2, J2004 and
J2007 are required to be set on. More details on the jumpers can be found in Table 1.
Table 1. Jumper settings for system power input through USB connection
Jumper Usage Comments
J2002(1-2)
3.3V power supply Use micro-USB connector supporting 3.3V
power source.
J2004
Current measurement Measures the current flow in MT7682.
J2003(1-2)
AVDD33_VRTC power supply Use micro-USB connector supporting RTC
3V3 power.
J2007
Current measurement in RTC
mode
Measures the current flow in RTC mode for
MT7682.
2) Power up using two AA or AAA battery.
•Connect two external AA battery to battery pin header (J2001) to supply power to the system, as shown
in Figure 6. When using two AA battery, plug the USB to micro-USB connector CON3001 (Figure 2). Note,
that the jumpers J2002 pin 2 and 3, J2003 pin2 and 3, J2004, J2007, and J2009are required to be set
on. More details on the jumpers can be found in Table 2.

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Figure 6. Power up the HDK using two AA or AAA Battery (J2001)
Table 2. System power input from AA or AAA battery jumpers
Jumper Usage Comments
J2002(2-3)
3.3V power supply Use AA or AAA battery source
supporting 3.3V power.
J2004
Current measurement Measures the current flow in MT7682.
J2003(2-3)
AVD33_VRTC power supply Use AA or AAA battery source
supporting RTC 3V3 power.
J2007
Current measurement in RTC mode Measures the current flow in RTC
mode for MT7682.
J2009
Enables booster Connects MT7682 EXT_PWR_EN (pin
17) to booster enabling pin
4.3. LEDs
The MT7682 HDK has onboard LEDs associated with different functionalities of the board (Figure 7).
1) D2002 indicates the power rail 5V is on.
2) D2001 indicates the power rail 3.3V is on.
3) Blinking LED3001 indicates communication between MK20 UART and MT7682 UART0.
4) D1, D2, D3, D4, and D5 are LEDs assigned for user interaction. All LEDs are high active (Figure 7).

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Figure 7. On-board LEDs
GPIO pins to activate the LEDs are shown in Table 3.
Table 3. GPIO pins to activate the LEDS
LED GPIO
D1 GPIO11
D2 GPIO12
D3 GPIO13
D4 GPIO14
D5 GPIO15
4.4. Buttons
The MT7682 HDK is equipped with buttons with the following functionality. The push buttons are shown in Figure
2.
1) System reset button (S2001) resets the MT7682 HDK.
2) External interrupt button (S2005). Users can configure GPIO0 as an external interrupt pin. Press the
button to wake up the system from the sleep mode.
3) RTC interrupt button (S2006). When the system is in RTC mode, push the button to wake up the system.
4) CMSIS-DAP Firmware update button (SW3001). Press the button to enter upload mode and upload the
latest CMSIS-DAP Firmware to MK20.

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4.5. Extension connectors
The MT7682 HDK provides similar pin-out extension connectors (J2101 and J2103) for various sensor and device
connectivity, as shown in Figure 2 and described in Table 4.
The board has 14 GPIOs multiplexed with other interfaces. Depending on the use case, user can configure each I/O
functionality. Although MT7682 and MT7686 HDKs share the same main board, they have different number of
GPIOs. MT7682 has 14 and MT7686 has 21 GPIOs.
Table 4. GPIO pin-out extension connectors
Connector
Pin Number
Signal Name Connector
Pin Number
Signal Name
J2101.1 GPIO22 * J2103.1 GPIO1
J2101.2 GPIO21 * J2103.2 GPIO0
J2101.3 X ** J2103.3 GPIO3
J2101.4 GPIO17 J2103.4 GPIO2
J2101.5 GPIO16 J2103.5 X **
J2101.6 GPIO15 J2103.6 GPIO4
J2101.7 GPIO14 J2103.7 X **
J2101.8 GPIO13 J2103.8 X **
J2101.9 GPIO12 J2103.9 X **
J2101.10 GPIO11 J2103.10 X **
J2101.11 X ** J2103.11 X **
J2101.12 RTC_EINT J2103.12 X **
*MT7682 the pins GPIO21 and GPIO22 are printed on the silkscreen of the HDK as G19/G20.
** MT7682 doesn’t support the pin.
Table 5. GPIO pin multi-function definition
Pin alias Name Description
GPIO0
GPIO0 General purpose input, output
EINT0 External interrupt
U1RTS UART RTS
SCL1 I2C CLK
I2S_RX I2S RX
JTDI JTAG Debug port
WIFI_ANT_SEL0 External frontend control
BT_PRI1 Wi-Fi and Bluetooth coexistence
control signal
PWM0 Pulse-width-modulated output
GPIO1
GPIO1 General purpose input, output
EINT1 External interrupt
U1CTS UART CTS

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SDA1 I2C Data
I2S_TX I2S TX
JTMS JTAG Debug port
WIFI_ANT_SEL1 External frontend control
BT_PRI3 Wi-Fi and Bluetooth coexistence
control signal
PWM1 Pulse-width-modulated output
GPIO2 GPIO2 General purpose input, output
EINT2 External interrupt
URXD1 UART RX
PWM0 Pulse-width-modulated output
I2S_WS I2S WS
JTCK JTAG Debug port
CLKO0 Clock out port
BT_PRI0 Wi-Fi and Bluetooth coexistence
control signal
WIFI_ANT_SEL4 External frontend control
GPIO3 GPIO3 General purpose input, output
EINT3 External interrupt
UTXD1 UART TX
PWM1 Pulse-width-modulated output
I2S_CK I2S bit clock
JTRST_B JTAG Debug port
WIFI_ANT_SEL2 External frontend control
I2S_CK I2S bit clock
GPIO4 GPIO4 General purpose input, output
SPISLV_A_SIO2 SPI slave SIO2
SPIMST_A_SIO2 SPI master SIO2
EINT4 External interrupt
I2S_MCK I2S MCLK
JTDO JTAG Debug port
WIFI_ANT_SEL3 External frontend control
I2S_MCK I2S MCLK
GPIO11 GPIO11 General purpose input, output
EINT11 External interrupt
PWM3 Pulse-width-modulated output
URXD2 UART RX
MA_MC0_CK SDIO master clock
SLV_MC0_CK SDIO slave clock
CLKO2 Clock out port

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WIFI_ANT_SEL0 External frontend control
I2S_RX I2S RX
GPIO12 GPIO12 General purpose input, output
SPISLV_B_SIO3 SPI slave SIO3
SPIMST_B_SIO3 SPI master SIO3
UTXD2 UART TX
MA_MC0_CM0 SDIO master command
SLV_MC0_CM0 SDIO slave command
EINT12 External interrupt
WIFI_ANT_SEL1 External frontend control
I2S_TX I2S TX
GPIO13 GPIO13 General purpose input, output
SPISLV_B_SIO2 SPI slave SIO2
SPIMST_B_SIO2 SPI master SIO2
U2RTS UART RTS
MA_MC0_DA0 SDIO mater Data0
SLV_MC0_DA0 SDIO slave Data0
CLKO4 Clock out port
EINT13 External interrupt
I2S_WS I2S WS
GPIO14 GPIO14 General purpose input, output
SPISLV_B_SIO1 SPI slave SIO1
SPIMST_B_SIO1 SPI master SIO1
TDM_RX TDM RX
MA_MC0_DA1 SDIO master Data1
SLV_MC0_DA1 SDIO slave Data1
PWM4 Pulse-width-modulated output
EINT14 External interrupt
CLKO4 Clock out port
GPIO15 GPIO15 General purpose input, output
SPISLV_B_SIO0 SPI slave SIO0
SPIMST_B_SIO0 SPI master SIO0
TDM_TX TDM TX
MA_MC0_DA2 SDIO mater Data2
SLV_MC0_DA2 SDIO slave Data2
SCL1 I2C Clock
EINT15 External interrupt
PWM3 Pulse-width-modulated output
GPIO16 GPIO16 General purpose input, output
SPISLV_B_SCK SPI slave clock

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4.6. RTC
MT7682 HDK features an RTC module. The clock source operates at 32.768kHz crystal oscillator or an external
clock source or internal RC oscillator. The RTC has built-in accurate timer to wake up the system when the user-
defined timer expires. The RTC uses a different power source from the Power Management Unit (PMU). In
retention mode, the PMU is turned off while the RTC module remains powered on. The RTC module only
consumes 3µA in hibernate mode. The RTC has a dedicated PMU control pin EXT_PWR_EN (pin 17) used to turn
the power on when the RTC timer expires and turn the power off when it intends to enter the retention mode.
4.7. RF connections
By default, the board ships with RF signals routed to the on-board circuit antenna. An on-board U.FL, a conductive
test component, (I-PEX) connector enables to test the signals using a compatible cable. If a user wants to perform
the testing, the user needs to solder the capacitor from the location C17 to C18.
SPIMST_B_SCK SPI master clock
TDM_WS TDM WS
MA_MC0_DA3 SDIO master Data3
SLV_MC0_DA3 SDIO slave Data3
SDA1 I2C data
EINT16 External interrupt
GPIO17 GPIO17 General purpose input, output
SPISLV_B_CS SPI slave CS
SPIMST_B_CS SPI master CS
TDM_CK TDM CK
CLKO3 Clock out port
AUXADC0 AUX ADC
EINT17 External interrupt
BT_PRI0 Wi-Fi and Bluetooth coexistence
control signal
GPIO21 GPIO21 General purpose input, output
URXD0 UART RX
EINT19 External interrupt
SCL1 I2C Clock
PWM5 Pulse-width-modulated output
GPIO22 GPIO22 General purpose input, output
UTXD0 UART TX
EINT20 External interrupt

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Figure 8. Location of the components C17 and C18
4.8. CMSIS-DAP Firmware update procedure
The latest firmware from OpenSDA platform can be downloaded from the mbed official website. To update the
binary firmware of CMSIS-DAP, press and hold the SW3001, then plug-in the USB cable to CON3001, release the
button SW3001 once the mass storage is shown, and then drag and drop in the binary code. After the mass
storage disappears, keep the power connected for 10 seconds, and then reboot the system again to finish the
firmware update.

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1. Schematics (V11)
Main board schematic-1
J2009
12EXT_PMU_EN
EXT_PWR_EN
21
J2002
DIP3/P2.54
JUMPER3
+
1
+2
+
3
V_2AA_O_3V3
J2003
DIP3/P2.54
JUMPER3
+
1
+2
+
3
+5V
S2001
KSW
CHIP_EN R2002 R / 1 / K / 0402
SYS_RST_N_M
EINT(GPIO)
EINT_0_M S2005
KSW
R2013R / 1 / K/ 0402
12R2014 R / 10 / K / 0402
1 2
GPIO0
ResetBotton
J2013
12
GPIO0_INT
GPIO0 21,90
J2014
12
DVDD_IO_1
J2016
12
J2015
12
5V
VRTC 21
Tit le
Siz e
Date: Sheet of
MTK Confidential
20_Power Tree
C
20 99Thursday, April 13, 2017
D2002
LED Green
12
LED_5V
R2004
R / 15 / K / 0402
1
2
+5V
J2010
1 2
J2011
1 2
RTC_EINT 21
VRTC
RTC_EINT
S2006
KSW
R2020 R / 10 / K / 0402
J2004
12
J2005
12
J2006
12
DVDD_IO_0
DVDD_IO_1
C2012
C / 10 / uF / 0805
12
C2001
C / 0.1 / uF / 0402
J2007
12
DC_DC_3V3
C2009
C / 0.1 / uF / 0402 / NC
12
R2011 R / 110 / K / 0402
12
R2010 R / 24.3 / K / 0402
12
C2008
C / 4.7 / uF / 0603
12
C2010
C / 220 / pF / 0402
1 2
VSW2
EN1EN1
C2007
C / 4.7 / uF / 0603
1
2
R2009
R / 0 / ohm / 0402 / NC
1 2
U2001
ITE7811
FB
5GND 2
EN 1
VIN
4LX/ SW 3
L2001
ZADR-252012MEH-4R7M
12
DC_DC_3V3
CHIP_EN 21,30
C2002
C / 0.1 / uF / 0402
12
+5V
C2003
C / 4.7 / uF / 0603
12
J2008
12
R2019 R / 10 / K / 0402
12VRTC_MM CHIP_EN
VRTC
3V3
R2012 R / 0 / ohm / 0603 / NC
12
3V3_IN
ICPower Consumption Measurement
DC_DC_3V3
3V3
C2013
C / 10 / uF / 0805
12
C2005
C / 0.1 / uF / 0402
R2003
R / 12 / K / 0402
12
D2001
LED Green
12
C2014
C / 10 / uF / 0805
1
2
3.3V_I
C2004
C / 1 / uF / 0402
3V3
LED5
R2001 R / 0 / ohm / 0603
1 2
RTCDomain Power Measurement
DC_DC_3V3 VRTC
V_2AA_B_I
R2008 R / 0 / ohm / 0603 / NC
12
VRTC_IN
C2011
C / 22 / uF / 0805
1
2
V_2AA_O_3V3
R2016
R / 86.6 / K / 0402
12
R2015
R / 487 / K / 0402
12
V_B_FB
V_B_1
V_B_2
R2017 R / 4.7 / K / 0402 / NC
V_B_PS
R2018 R / 4.7 / K / 0402
V_2AA_B_I
2xAABattery
V_2AA Q2001
SI2323DS-T1-GE3
R2005
R / 0 / ohm / 0402
12 V_2AA_MM
R2006 R/ 0 / ohm / 0603 / NC
12
V_2AA_B_I
Reverse
voltage
protection
EXT_PMU_EN
J2001
HEADER 2 1
2
C2006
C / 10 / uF / 0603
1
2
L2002
ZADM-252012MEH-2R2M
12
U2002
RT6150AGQW
FB 10
GND
9
VOUT 1
GND
3
VINA
8VIN
5
GND
11
LX2 2
LX1 4
EN
6
PS
7
AA
3V3_FB
J2012
1 2