Vega RV32M1-VEGA User manual

RV32M1-VEGA Development Board
1. Introduction
This guide describes the hardware for the RV32M1-
VEGA Development Board. The RV32M1-VEGA
development board is a small, low-power, and cost-
effective evaluation and development board for application
prototyping and demonstration of the RV32M1 device.
These evaluation boards offer easy-to-use mass-storage-
device mode flash programmer, a virtual serial port, and
standard programming and run-control capabilities.
The RV32M1 is an ultra-low power, highly integrated
single-chip device that enables Bluetooth Low Energy
(BLE), Generic FSK (at 250, 500, 1000 and 2000 kbps) or
IEEE Standard 802.15.4 with Thread support for portable,
extremely low-power embedded systems.
The RV32M1 integrates a radio transceiver operating in
the 2.36 GHz to 2.48 GHz range supporting a range of
FSK/GFSK and O-QPSK modulations, an ARM Cortex-
M4 CPU, ARM Cortex-M0+ CPU, RISC-V RI5CY CPU,
RISC-V ZERO_RISCY CPU, 1.25 MB Flash and 384 KB
SRAM, BLE Link Layer hardware, 802.15.4 packet
processor hardware and peripherals optimized to meet the
requirements of the target applications.
WWW.OPEN-ISA.ORG
RM32M1-
VEGA
User’s Guide
Contents
1. Introduction ........................................................................1
2Overview and description...................................................2
2.1 Overview .................................................................2
2.2 Feature description ..................................................3
2.3 OpenSDA serial and debug .....................................5
3Functional description ........................................................6
3.1 RF circuit.................................................................6
3.2 Clocks......................................................................7
3.3 Power management .................................................7
3.4 Universal Serial Bus (USB).....................................8
3.5 Secure Digital Host Controller (SDHC) ..................9
3.6Serial flash memory...............................................10
3.7 Accelerometer + Magnetometer Combo Sensor....10
3.8 Visible light sensor................................................11
3.9 User application LEDs ..........................................12
3.10 User buttons...........................................................12
4Headers and jumpers ........................................................14
4.1 Arduino compatible I/O headers............................14
4.2 Jumper table ..........................................................21
5References ........................................................................22
6Revision history................................................................23

Overview and description
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2. Overview and description
The RV32M1-VEGA development board is an evaluation environment supporting RISC-V cores based
RV32M1 Wireless Microcontrollers (MCU). The RV32M1 integrates a radio transceiver operating in
the 2.36 GHz to 2.48 GHz range (supporting a range of FSK/GFSK and O-QPSK modulations) an ARM
Cortex-M4 CPU, an ARM Cortex-M0+ CPU, a RSIC-V RI5CY MCU and a RSIC-V ZERO_RISCY
MCU into a single package. www.open-isa.org supports the RV32M1 with GNU toolchain and software
that include hardware evaluation and development boards, Eclipse-based software development IDE,
applications, drivers, custom PHY usable with IEEE Std. 802.15.4 compatible MAC, and BLE Link
Layer. The RV32M1-VEGA development board consists of the RV32M1 device with a 32 MHz
reference oscillator crystal, RF circuitry (including antenna), 32-Mbit external serial flash, and
supporting circuitry in the popular Freedom board form-factor. The board is a standalone PCB and
supports application development with Bluetooth Low Energy, Geeric FSK and IEEE Std. 802.15.4
protocol stacks including Thread.
2.1 Overview
Figure 1 is a high-level block diagram of the RV32M1-VEGA board features:
Figure 1. RV32M1-VEGA block diagram

Overview and description
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2.2 Feature description
The RV32M1-VEGA development board is the most diverse reference design containing the RV32M1
device and all necessary I/O connections for use as a stand-alone board, or connected to an application.
Figure 2 shows the RV32M1-VEGA development board.
Figure 2. RV32M1-VEGA development board
The RV32M1-VEGA development board has these features:
•Ultra-low-power RV32M1 Wireless MCU supporting BLE, Generic FSK, and IEEE Std.
802.15.4 (Thread) platforms
•IEEE Std. 802.15.4-2006 compliant transceiver supporting 250 kbps O-QPSK data in 5.0 MHz
channels, and full spread-spectrum encoding and decoding
•Fully compliant Bluetooth v4.2 Low Energy (BLE)
•Reference design area with small-footprint, low-cost RF node:
oSingle-ended input/output port
oLow count of external components
oProgrammable output power from -30 dBm to +3.5 dBm at the SMA connector
oReceiver sensitivity is -100 dBm, typical (@1 % PER for 20-byte payload packet) for
802.15.4 applications, at the SMA connector
oReceiver sensitivity is -95 dBm (for BLE applications) at the SMA connector
•Integrated PCB inverted F-type antenna and SMA RF port (requires moving C122 to C121)
•Selectable power sources
•DC-DC converter with Buck and Bypass operation modes

Overview and description
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•32 MHz reference oscillator
•32.768 kHz reference oscillator
•2.4 GHz frequency operation (ISM and MBAN)
•USB device mode interface with micro USB connector
•32-Mbit (4 MB) external serial flash memory for Over-the-Air Programming (OTAP) support
•FXOS8700CQ Digital Sensor, 3D Accelerometer (±2g/±4g/±8g) + 3D Magnetometer
•Integrated Open-Standard Serial and Debug Adapter (OpenSDA)
•One RGB LED indicator
•One red LED status indicator
•One green LED power indicator
•One red LED reset indicator
•One amber LED OpenSDA activity indicator
•Four push-button switches
Figure 3 shows the main board features and Input/output headers for the RV32M1-VEGA board:
Figure 3. RV32M1-VEGA component placement

Overview and description
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2.3 OpenSDA serial and debug
The RV32M1-VEGA development board includes OpenSDA v2.4 - a serial and debug adapter circuit
that includes an open-source hardware design, an open-source bootloader, and debug interface software.
It bridges serial and debug communications between a USB host and an embedded target processor as
shown in Figure 4.The hardware circuit is based on a Kinetis K26 family MCU (MK26FN2M0VMI18)
with 2 MB of embedded flash and an integrated USB controller. OpenSDA v2.4 comes preloaded with
the DAPLink bootloader - an open-source mass storage device (MSD) bootloader and the Interface
firmware, which provides an MSD flash programming interface, a virtual serial port interface, and a
CMSIS-DAP debug protocol interface. For more information on the OpenSDA v2.4 software, see
mbed.org, https://github.com/mbedmicro/DAPLink.
Figure 4. OpenSDA v2.4 high-level block diagram
OpenSDA v2.4 is managed by a Kinetis K26 MCU built on the ARM Cortex-M4 core. The OpenSDA
v2.4 circuit includes a status LED (D5) and a pushbutton (SW1). The pushbutton asserts the Reset signal
to the RV32M1 target MCU. It can also be used to place the OpenSDA v2.4 circuit into bootloader
mode. UART and GPIO signals provide an interface to either the SWD debug port or the K26. The
OpenSDA v2.4 circuit receives power when the USB connector J12 is plugged into a USB host.

Functional description
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2.3.1 Virtual serial port
A serial port connection is available between the OpenSDA v2.4 MCU and pins PTC7 and PTC8 of the
RV32M1.
NOTE
To enable the Virtual COM features, a driver must be installed. Download the driver at
https://developer.mbed.org/handbook/Windows-serial-configuration
3. Functional description
The six-layer board provides the RV32M1 with its required RF circuitry, 32 MHz reference oscillator
crystal, and power supply with a DC-DC Buck converter, and Bypass modes. The layout for this base-
level functionality can be used as a reference layout for your target board.
3.1 RF circuit
The RV32M1-VEGA RF circuit provides an RF interface for users to begin application development. A
minimum matching network to the MCU antenna pin is provided through C13 and L5.
An optional SMA is located at J6. This is enabled by rotating the 10pF capacitor in C122 to the location
of C121. Figure 5 shows the RF circuit in detail.
Figure 5. RV32M1-VEGA RF circuit

Functional description
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3.2 Clocks
The RV32M1-VEGA board provides two clocks. A 32 MHz for clocking the MCU and Radio, and a
32.768 kHz to provide an accurate low power time base:
•32 MHz Reference Oscillator
oThe IEEE Std. 802.15.4 requires the frequency to be accurate to less than ±40 ppm
oInternal load capacitors provide the crystal load capacitance
oTo measure the 32 MHz oscillator frequency, enable the RF_CLKOUT signal to provide
buffered output clock signal to TP19
•32.768 kHz Crystal Oscillator (for accurate low-power time base)
oA 32.768 kHz crystal Y1 is provided
oInternal load capacitors provide the entire crystal load capacitance
oTo measure the 32.768 kHz oscillator frequency, enable the RTC_CLKOUT signal to be
available on the TAMPER1 pin. This can be observed at J4-3
3.3 Power management
There are several different ways to power and measure current on the RV32M1-VEGA board. The
RV32M1-VEGA power distribution scheme is shown in Figure 6:
Figure 6. RV32M1-VEGA power management circuit

Functional description
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The RV32M1-VEGA board will typically be powered by a 5V source by one of the following means:
•OpenSDA micro USB type B connector (J12)
•RV32M1 micro USB type B connector (J8)
•Through the header J3 pin-10
•Optional 5V regulator populated at J15
The 5V supply then powers an adjustable regulator, U43, and a 1.8V regulator, U45. The adjustable
regulator is preset to provide a nominal 3.3V output. The adjustable regulator output can be controlled
by connecting an external supply in series with a 3.9k resistor to J52-1. The external supply range of
0.9V to 2.7V will adjust the regulator output from 3.6V to 1.8V.
The RV32M1 and supporting circuitry can then be powered using the adjustable regulator or a CR2032
coin cell selected by means of J18. The 1.8V regulator provides the ability to run the device with split
supplies.
Typical power supply configurations are shown in Table 1
RV32M1-VEGA power supply configurations
Description
J10
J48
J14
J16
J19
Single Supply Operation, IO @ 3.3V
1-2
1-2
1-2
1-2
1-2
Single Supply Operation, RF & IO @ 1.8V
1-2
1-2
2-3
2-3
open
Dual IO, 3.3V and 1.8V
1-2
1-2
1-2
1-2
2-3
Full bypass
open
open
open
open
open
These jumpers provide access to insert ammeters in all the supplies connecting to the RV32M1 device.
They also provide a means of connecting external supplies to any of the RV32M1 power pins.
In the case of using a single supply, an ammeter can be placed across J18 to measure the entire system
current. Alternatively, an ammeter can be placed across J53 pins 2 and 3 to measure current with the
LEDs and sensor core taken out of the reading. To minimize the current drawn by the other board
components and measure the current drawn by just the RV32M1 device, the following steps are
recommended
•Cut the trace under J5 to isolate the power indicator LED (if using J18)
•Cut the trace under J47 to isolate the photo transistor
•Place the SPI flash in ultra-low power mode by writing the command value 0xB9.
3.4 Universal Serial Bus (USB)
The RV32M1 MCU features a full-speed USB module with device capability and built-in transceiver.
The RV32M1-VEGA board routes the USB D+ and D- signals from the RV32M1 MCU directly to the
onboard micro USB connector (J8) via the required 33ohm resistors. Figure 7 shows the complete USB
circuit.

Functional description
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Figure 7. USB connector circuit
3.5 Secure Digital Host Controller (SDHC)
A micro secure digital (SD) card slot is supported on the RV32M1-VEGA. The SD card detect pin is an
open switch that shorts with VDD when the card is inserted. The SD card VDD is supplied by VDDI01
and it must be configured to be at least 2.7V. The SD card connections are shown in Figure 8.
Figure 8. Micro SD card connector circuit

Functional description
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3.6 Serial flash memory
Component U15 is the MX25R3235FZNIL0 32-Mbit (4 MB) serial flash memory with SPI interface. It
is intended for Over-the-Air Programming (OTAP) or for storing the non-volatile system data, or
parameters.
Figure 9 below shows the memory circuit:
•Memory power supply is VDDIO1_SDA_SPI
•Discrete pull-up resistors pads are provided for the SPI port
•The memory uses a dedicated SPI port
•The SPI Write Protect and Reset has a discrete pull-up resistor
•Series zero ohm resistors are provided if it is desired to isolate the memory from the RV32M1
device.
Figure 9. MX25R3235FZNIL0 32-Mbit (4 MB) serial flash memory circuit
3.7 Accelerometer + Magnetometer Combo Sensor
Component U14 is a FXOS8700CQ sensor, a six-axis sensor with integrated linear accelerometer and
magnetometer with very low power consumption, and selectable I2C. Figure 10 shows the sensor circuit.
•The sensor core is powered by the BRD_PER rail and the sensor IO is powered by the
BRD_IO_PER rail
oThis allows the sensor IO to be operated at a lower voltage than the sensor core supply
•Discrete pull-up resistors for the I2C bus lines are provided
•Default address is configured as 0x1E:
oAddress can be changed by pull-up/pull-down resistors on SA0 and SA1 lines
•There are two interrupt signals routed
•The I2C uses dedicated lines for the I2C interface and GPIO connections
•Series zero ohm resistors and shorting links are provided if it is desired to isolate the sensor from
the RV32M1 device.

Functional description
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Figure 10. FXOS8700CQ combo sensor circuit
3.8 Visible light sensor
One phototransistor (Q1) is connected to ADC input channel SE3 of the RV32M1 for evaluating the
ADC module as shown in Figure 11.
Figure 11. Visible Light Sensor circuit
The light sensor Output is shared with header J4 pin-6. The light sensor maybe isolated from the
RV32M1 device, and header J4 pin-6, by cutting the shorting link SH1. The light sensor is powered by

Functional description
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VDDA_RV32 so if VREFH is configured to be less than VDDA_RV32, the maximum voltage the ADC
can convert will be that of VREFH.
With no light reaching the light sensor, there will be a small current drawn from VDDA_RV32. If it is
desired to measure the lowest MCU current, then the trace under J47 will need to be cut.
3.9 User application LEDs
The RV32M1-VEGA provides an RGB LED for user applications. A single red LED, D22, is provided
as a general status indicator. Figure 12 shows the circuitry for the LEDs.
Figure 12. RV32M1-VEGA RGB LED circuit
The LEDs are powered by the BRD_PER rail and controlled by Q6 and Q7. This allows the LEDs to
operate while being controlled by GPIO that are powered at a voltage less than BRD_PER. The Blue
and Green LED in the RGB LED will not illuminate when BRD_PER is at lower voltages.
3.10 User buttons
Four tactile buttons are populated on the RV32M1-VEGA for Human Machine Interaction (HMI).
Figure 13shows the circuit for the tactile buttons.

Functional description
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Figure 13. RV32M1-VEGA HMI circuit.
SW2 provides an external pull up device. It is connected to the RV32M1 NMI pin. This provides the
option of using this switch as an NMI/wake up source, ROM bootloader boot option source or as a
general-purpose input with interrupt capability.
SW3, SW4 and SW5 all provide general purpose inputs with interrupt and wake up capability. The
internal pull up device for each pin must be enabled when these are being used.

Headers and jumpers
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4. Headers and jumpers
4.1 Arduino compatible I/O headers
Figure 14. RV32M1-VEGA I/O header pinout

Headers and jumpers
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Figure 15. RV32M1-VEGA I/O header pinout
Table 2 shows the signals that can be multiplexed to each pin.
Arduino compatible header/connector pinout (J1 and J2)
Header Pin
No
Name Type / RV32M1
Pin
GPIO Functions
J1
1 Freedom
Proprietary
PTE18 TPM2_CH2 / I2S0_RXD / FXIO0_D8
RV32M1 (Pin K13)

Headers and jumpers
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2 D0 Arduino Uno R3 PTA25 LPUART1_RS / LPI2C2_SCLS /
LPSPI3_SOUT
RV32M1 (Pin B5)
3 Freedom
Proprietary
PTE17 TPM2_CH1 / I2S0_RX_FS /
FXIO_D7
RV32M1 (Pin L15)
4 D1 Arduino Uno R3 PTA26 LPUART1_TX / LPI2C2_SCLS /
LPSPI3_PCS2
RV32M1 (Pin A5)
5 Freedom
Proprietary
PTE21 TPM2_CH4 / I2S0_TXD1 /
USB0_SOF_OUT / FXIO0_D10
RV32M1 (Pin J17)
6 D2 Arduino Uno R3 PTA27 LPUART1_CTS / LPSPI3_SIN
RV32M1 (Pin A3)
7 Freedom
Proprietary
PTE16 TPM2_CH0 / I2S0_RX_BCLK /
FXIO0_D6
RV32M1 (Pin L14)
8 D3 Arduino Uno R3 PTB13 TPM3_CH0 / LPUART2_CTS /
LPI2C1_SDA / LPI2C0_SDAS /
FXIO0_D3
RV32M1 (Pin G3)
9 Freedom
Proprietary
PTE19 TPM2_CH3 / I2S0_MCLK / FXIO_D9
RV32M1 (Pin K16)
10 D4 Arduino Uno R3 PTB14 LPUART2_RTS / LPI2C1_SCL /
LPI2C0_SCLS / TPM3_CH1 /
FXIO0_D4
RV32M1 (Pin G2)
11 Freedom
Proprietary
PTE15 TPM3_CLKIN / I2S0_TXD /
FXIO0_D5
RV32M1 (Pin L17)
12 D5 Arduino Uno R3 PTA30 LLWU_P3 / LPUART2_CTS /
LPSPI1_SOUT / TPM1_CH0
RV32M1 (Pin A1)

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13 Freedom
Proprietary
PTE14 TPM3_CH1 / LPI2C3_HREQ /
I2S0_TX_FS / FXIO0_D4
RV32M1 (Pin L16)
14 D6 Arduino Uno R3 PTA31 TPM1_CH1 / LPUART2_RTS /
LPSPI1_PCS2
RV32M1 (Pin
AC4)
15 Freedom
Proprietary
PTE13 TPM3_CH0 / LPI2C3_SCLS /
I2S0_BCLK / FXIO0_D3
RV32M1 (Pin N17)
16 D7 Arduino Uno R3 PTB1 LPUART2_RX / LPSPI1_PCS0 /
I2S0_TXD1
RV32M1 (Pin J12)
J2
1 Freedom
Proprietary
PTD5 ADC0_S38 / SDHC0_D4 /
EMVSIM0_VCCEN / FXIO0_D25
RV32M1 (Pin N10)
2 D8 Arduino Uno R3 PTB2 TPM0_CH0 / LPUART2_RX /
LPSPI0_PCS1 / I2S0_TXD0
RV32M1 (Pin D12)
3 Freedom
Proprietary
PTD4 LPSPI2_PCS1 / SDHC0_D5 /
EMVSIM0_RST / FXIO0_D24
RV32M1 (Pin N8)
4 D9 Arduino Uno R3 PTB3 TPM0_CH1 / LPUART1_TX
LPSPI0_PCS3 / I2S0_TX_FS
RV32M1 (Pin C1)
5 Freedom
Proprietary
PTD3 TPM2_CLKIN / LPSPI0_PCS0 /
SDHC0_D6 / EMVSIM0_CLK /
FXIO0_D23
RV32M1 (Pin T8)
6 D10 Arduino Uno R3 PTB6 TPM0_CH4 / LPI2C1_SDA /
LPSPI0_PCS2 / I2S0_RX_BCLK
RV32M1 (Pin E1)
7 Freedom
Proprietary
PTD2 LPSPI0_SIN / SDHC0_D7 /
FXIO0_D22
RV32M1 (Pin U7)

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8 D11 Arduino Uno R3 PTB5 TPM0_CH3 / LPUART1_RTS /
LPSPI0_SOUT / I2S0_MCLK
RV32M1 (Pin D2)
9 Freedom
Proprietary
PTD1 LPUART1_RTS / LPSPI0_PCS2 /
FXIO0_D21
RV32M1 (Pin P7)
10 D12 Arduino Uno R3 PTB7 TPM0_CH5 / LPI2C1_SDAS /
LPSPI0_SIN / I2S0_RX_FS
RV32M1 (Pin E2)
11 Freedom
Proprietary
PTD0 TPM0_CH0 / LPUART1_CTS /
LPSPI0_SOUT / FXIO0_D20
RV32M1 (Pin T7)
12 D13 Arduino Uno R3 PTB4 TPM0_CH2 / LPUART1_CTS /
LPSPI0_SCK / I2S0_TX_BCLK
RV32M1 (Pin C2)
13 Freedom
Proprietary
PTC30 TPM0_CH1 / LPUART1_TX /
LPSPI0_SCK / FXIO0_D19
RV32M1 (Pin R7)
14 GND Arduino Uno R3
15 Freedom
Proprietary
PTC29 TPM0_CH2 / LPUART1_RX /
LPSPI0_PCS3 / FXIO0_D18
RV32M1 (Pin N6)
16 ARE
F
Arduino Uno R3
17 Freedom
Proprietary
PTC28 TPM0_CH3 / LPSPI0_PCS1 /
FXIO0_D17
RV32M1 (Pin U5)
18 D14 Arduino Uno R3 PTC9 LLWU_P16 / TPM0_CH2 /
LPUART0_CTS / LPI2C0_SDA /
LPSPI0_SOUT
RV32M1 (Pin R1)
19 Freedom
Proprietary
PTB29 LPUART3_TX / I2S0_TX_FS /
FXIO0_D16

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RV32M1 (Pin L3)
20 D15 Arduino Uno R3 PTC10 TPM0_CH3 / LPUART0_RTS /
LPI2C0_SCL / LPSPI0_PCS2
RV32M1 (Pin R2)
Arduino compatible header/connector pinout (J3 and J4)
Header Pin
No
Name Type / RV32M1
Pin
GPIO Functions
J3
1
Freedom Proprietary
RV32M1 (Pin B7)
PTA21
TPM2_CH3 / LPSPI2_SOUT
/ EMVSIM0_PD
2
N.C.
3
Freedom Proprietary
RV32M1 (Pin C7)
PTA20
TPM2_CH4 / LPSPI2_SCK /
LPSPI1_PCS1 /
EMVSIM0_IO
4
3V3
Arduino Uno R3
5
Freedom Proprietary
RV32M1 (Pin D7)
PTA19
TPM2_CH5 / LPSPI2_PCS3
/ LPSPI3_SCK /
EMVSIM0_VCCEN
6
RESET
Arduino Uno R3
7
Freedom Proprietary
RV32M1 (Pin D8)
PTA18
LPSPI2_PCS1 /
LPSPI3_PCS3 /
EMVSIM0_RST
8
3V3
Arduino Uno R3
9
Freedom Proprietary
RV32M1 (Pin F7)
PTA17
LPI2C2_HREQ /
LPSPI3_PCS1 /
EMVSIM0_CLK
10
5V
Arduino Uno R3
11
Freedom Proprietary
RV32M1 (Pin K5)
PTB17
LPUART3_RTS /
LPI2C3_SCLS / FXIO0_D7
12
GND
Arduino Uno R3

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13
Freedom Proprietary
RV32M1 (Pin H5)
PTB16
LPUART3_CTS /
LPI2C3_SDA / FXIO0_D6
14
GND
Arduino Uno R3
15
Freedom Proprietary
RV32M1 (Pin G1)
PTB15
TPM0_CLKIN /
LPI2C1_HREQ /
LPI2C3_SCL / FXIO0_D5
16
Vin
Arduino Uno R3
J4
1
Freedom Proprietary
RV32M1 (Pin G12)
TAMPER2
2
A0
Arduino Uno R3
RV32M1 (Pin T1)
PTC11
LLWU_P17 / TPM0_CH4 /
LPI2C1_SDA /
LPI2C0_SDAS / LPSPI0_SIN
3
Freedom Proprietary
RV32M1 (Pin F13)
TAMPER1
4
A1
Arduino Uno R3
RV32M1 (Pin R3)
PTC12
LLWU_P18 / TPM0_CH5 /
LPI2C1_SCL /
LPI2C0_SCLS /
LPSPI0_PCS0
5
Freedom Proprietary
RV32M1 (Pin F14)
TAMPER0
6
A2
Arduino Uno R3
RV32M1 (Pin F4)
PTB9
ADC0_SE3 / LPI2C1_SCL /
LPSPI0_PCS1 / I2S0_RXD1
/ FXIO0_D0
7
Freedom Proprietary
RV32M1 (Pin P12)
PTE2
ADC0_SE19 / LPI2C0_SCLS
/ LPSPI3_PCS3 /
SDHC0_D0
8
A3
Arduino Uno R3
RV32M1 (Pin M11)
PTE4
ADC0_SE21 / TPM1_CLKIN
/ LPI2C0_SCL /
LPSPI3_SOUT / SDHC0_D6
9
Freedom Proprietary
RV32M1 (Pin R17)
PTE5
LPI2C0_HREQ /
LPSPI3_PCS2 /
SDHC_DCLK