Saturn M7

The Saturn M7 is an embedded audio development board designed around a STM32F7 series microcontroller by STMicroelectornics.

The microcontroller has an ARM® Cortex®-M7 core running at 216Mhz, capable of performing multimedia signal processing tasks while simultaneously managing various communication peripherals.

The board is designed to expose all the audio related peripherals available on the microcontroller, in addition to all communication peripherlas relevant to controlling the system.

The board has a high performance Delta Sigma CODEC (32bit, 216KHz, 108dB S/N) with 2 channels of input and 2 channels of output. The inputs can be captured at 16, 20, 24, and 32 bit resolution at up to 192KHz, while output resolutions of 16, 24, and 32 bit at 192KHz are supported. The CODEC has high resolution filters for superior audio quality featuring short group delays.

The board also has 4 omni-directional MEMS microphones with an acoustic overload point of 120dB SPL, a 61dB signal-to-noise ratio, and -26dB FS sensitivity. The microphones respond to frequencies between 20Hz and 10KHz. They have a flat response between 100Hz and 5KHz (±1dB).

The board has a stereo class-AB headphone amplifier capable of driving 60mW into a 16 Ohm load. It also has a stereo class-D audio amplifier capable of driving 2.1W per channel into a 4 Ohm load. Both amplifiers are connected to the CODEC’s output.

The board comes with a low jitter, 8 channel configurable clock synthesizer. It drives the audio peripherals and CODEC.

Clocks on multiple Saturn M7 boards can be synchronized down to 8ns over Ethernet through Precision Time Protocol (PTP).

The board has a 60 pin high speed header to interface with a TFT display with touch screen capability over MIPI-DSI. It also has a 96 pin header, which exposes the many digital and analog I/O pins and peripherals of the microcontroller.

The board can be powered over any of the USB ports, through a DC barrel connector, or a lithium-ion battery.

An on-board programmer and debugger is available through a USB interface, which can also be configured as a virtual COM port. The board can also interface with external programmers and debuggers.

Board Features

Function	Features
Processer	STM32F769 ARM Cortex-M7 running at 216 MHz 2MByte Flash and 512 KByte SRAM
External Memory	16Mbit Asynchronous SRAM with 10ns response time 512Mbit External NOR QUAD SPI Flash
Audio	32-bit / 192KHz / 108dB SNR Stereo input/output CODEC 4x MEMS Microphones Class A/B Headphone Amplifier (80mW into 16 Ohms) Class D Audio Amplifier (2.1W into 4 Ohm @ 5V) x3 Serial Audio Interfaces (SAI) available through the expansion headers 1 x4 S/PDIF Transmitters available on the SAI data channels S/PDIF Receiver with x4 input selections over the expansion headers Two half duplex I2S peripherals 2, 3 with a master clock output
Ethernet	10/100 Base-T with Precision Time Protocol
USB	x1 High Speed On-The-Go with Sync x1 Full Speed On-The-Go
Clock	8 channel clock generator (up to 200MHz) programmable over I2C Ultra low jitter clock available over expansion
Display / Touch	Dual channel MIPI-DSI available through high speed expansion with HDMI support Multi-Touch interface support through I2C
Serial Peripherals	x1 SPI port with hardware controlled chip select x3 I2C ports x3 UART ports 4
Programming / Debugging	Serial Wire Debug (SWD) over dedicated High Speed USB with Virtual COM Port (VCP) Support for external SWD debugger with Serial Wire Output (SWO) over expansion header DFU programming available over full speed USB port UART programming available over VCP
Power	5V to 15V supply over barrel connector 5V supply over USB ports 3.7V Lithium-Ion battery Power management circuit Low power and sleep modes available External power supply over expansion header possible
Interface	x1 red LED x1 green LED x1 user button x1 reset button
Configuration	x28 jumpers to re-route signals to support various hardware configurations x13 jumpers to isolate circuit subsections
Dimensions	78mm x 110mm (3.07” x 4.33”)

1. fourth interface is shared with the QUAD SPI peripheral.
2. can also be configured as SPI peripherals with hardware controlled chip select.
3. connected to the CODEC by default, but can be routed to the expansion headers.
4. optional hardware flow control and synchronous clock are available.

Inputs and Outputs

Item	Description
A	Programming / Debugging | USB Micro-B
B	High Speed On-The-Go | USB Micro-AB
C	Full Speed On-The-Go | USB Micro-AB
D	Stereo Audio Input | 3.5mm Stereo Female
E	Stereo Audio Output | 3.5mm Stereo Female
F	DC Input 5V to 15V | 5.5mm/2.5mm Barrel Connector
G	Ethernet 10/100 BASE-T with Precision Time Protocol
H	Audio Amplifier Terminal Block
K	Lithium Ion Battery Connector
L	Expansion | 96 Pin Header
M	MEMS Microphone
N	Expansion | 60 Pin High Speed Header
O	External Programming/Debugging | 10 Pin Header

Major Components

Item	Function | Manufacturer | PN
1	Serial Wire Debug and Virtual COM Port | FTDI | FT232H
2	High-Speed USB PHY | Microchip | USB3300-EZK
3	2:2 Low Jitter Universal Buffer/Level Translator | Silicon Labs | SI53307
4	Audio CODEC | Asahi Kasei | AK4558EN
5	Headphone Amplifier | Texas Instruments | TPA4411
6	Ethernet PHY - IEEE 1588 Precision Time Protocol Transceiver| Texas Instruments | DP83640TVV
7	Class-D Audio Power Amplifier | Texas Instruments | TPA2012D2
8	Power Conditioning and Management
9	Very High-Performance MCUs with ARM® Cortex®-M7 Core | STMicroelectronics | STM32F769BIT6
10	16 Mbit High-Speed Asynchronous SRAM | ISSI | IS61WV102416BLL-10TLI
11	512 Mbit Multuple I/O Serial Flash Memory | Micron | MT25QL512ABB8ESF-0SIT
12	8 Channel Clock Generator | Silicon Labs | SI5351C
M	MEMS Audio Sensor Omnidirectional Digital Microphone | STMicroelectronics | MP34DT01TR

96 Pin Expansion Header (CN12)

Primary Signal | Secondary Signal(s) | Power / Ground / Reset | Clock

ROW	A	B	C
1	UART5_RX TIM3_ETR	DGND	UART5_DE/RTS USART6_CK TIM3_CH3 TIM8_CH3
2	3.3V Digital	GPIO I2C3_SMBA TIM12_CH2	GPIO TIM8_CH3N
3	nRST	GPIO I2C3_SDA	GPIO I2C4_SMBA TIM5_CH1
4	3.3V Digital	UART5_TX I2S3_SD SPI3_MOSI USART3_CK	BOOT0
5	Si5351 CLK 3	SAI1_FS_A SAI1_FS_A DFSDM1_DATIN3	Si5351 CLK 4
6	SAI2_MCLK_A TIM8_BKIN	SAI1_SCK_A DFSDM1_CKIN3 TIM9_CH1	Si5351 CLK 5
7	SAI2_SCK_A TIM8_CH1	SAI1_SD_A SAI2_MCLK_B TIM1_BKIN2 TIM9_CH2	I2C4_SCL TIM5_CH2
8	SAI2_SD_A TIM8_CH2	SAI1_SD_B SPI5_NSS UART7_RX TIM10_CH1	I2C4_SD TIM5_CH3
9	SAI2_FS_A TIM8_CH3	SPDIFRX_IN0 DFSDM1_DATIN4 DFSDM1_CKIN1	GPIO SAI1_MCLK_A USART6_CK
10	SAI2_SD_B	SPDIFRX_IN1 LPTIM1_IN1 USART6_DE/RTS	GPIO LPTIM1_IN2 SAI2_SCK_B
11	SPI5_MOSI SAI2_SD_B	SPDIFRX_IN2 ETH_PPS_Out USART6_DE/RTS	GPIO LPTIM1_IN2 SAI2_SCK_B
12	SPI5_SCK I2C2_SMBA TIM12_CH1	SPDIFRX_IN3 USART6_RX SAI2_FS_B	GPIO USART6_CTS
13	SPI5_MISO I2C3_SCL	DFSDM1_CKOUT I2S2_CK SPI2_SCK DFSDM1_DATIN0<	RTC_TS USART6_CTS
14	I2C1_SDA DFSDM1_CKIN5 USART1_RX I2C4_SDA TIM4_CH2	DFSDM1_DATIN1 DFSDM1_CKIN4 I2S3_SD SPI3_MOSI SAI1_SD_A	RTC_TAMP1 SYS_WKUP5
15	I2C1_SCL I2C4_SCL DFSDM1_CKIN7 UART5_RX CAN1_RX TIM4_CH3 TIM10_CH1	DFSDM1_DATIN3 I2S3_MCK USART6_RX TIM3_CH2 TIM8_CH2	CEC UART4_DE/RTS SPI3_NSS I2S3_WS UART7_TX TIM2_CH1 TIM2_ETR
16	I2C2_SCL	ADC1_IN0 ADC2_IN0 ADC3_IN0 TIM2_CH1 TIM2_ETR TIM5_CH1 TIM8_ETR	UART4_TX CAN1_TX TIM8_CH1N
17	I2C2_SDA SPI5_NSS	ADC1_IN12 ADC2_IN12 ADC3_IN12 SPI2_MISO DFSDM1_CKOUT DFSDM1_CKIN1	UART4_RX CAN1_RX TIM8_CH2N
18	USART1_TX UART4_DE/RTS DFSDM1_DATIN2 SPI2_MISO USART3_DE/RTS TIM1_CH2N TIM8_CH2N TIM12_CH1	ADC1_IN6 ADC2_IN6 TIM1_BKIN TIM3_CH1 TIM8_BKIN TIM13_CH1	GPIO UART4_RX CAN1_RX
19	USART1_RX UART4_CTS RTC_REFIN I2S2_SD SPI2_MOSI DFSDM1_CKIN2 TIM1_CH3N TIM8_CH3N TIM12_CH2	I2S2_MCK USART6_TX DFSDM1_CKIN3 TIM3_CH1 TIM8_CH1	GPIO
20	I2S2_CK SPI2_SCK TIM8_BKIN2	I2S2_WS SPI2_NSS TIM5_CH4	UART5_TX DFSDM1_DATIN7 I2S2_WS SPI2_NSS CAN1_TX I2C1_SDA I2C4_SDA I2C4_SMBA TIM4_CH4 TIM11_CH1
21	I2S3_CK SPI3_SCK USART3_TX UART4_TX DFSDM1_CKIN5	SPI2_MISO TIM8_CH4	ADC3_IN5 SPI5_SCK SAI1_MCLK_B UART7_TX TIM11_CH1
22	I2S3_SD SPI3_MOSI SAI1_SD_A DFSDM1_CKIN1	I2S2_SD SPI2_MOSI TIM8_ETR	ADC1_EXTI11 ADC2_EXTI11 ADC3_EXTI11 DFSDM1_DATIN5 SPI3_MISO USART3_RX UART4_RX
23	SPI3_MISO I2S2_WS SPI2_NSS UART7_TX TIM3_CH1	EXT DIFF CLK P	Si5351 CLK 6
24	I2S3_WS USB_OTG_HS_SOF DAC OUT 1 SPI3_NSS	EXT DIFF CLK N	Si5351 CLK 7
25	3.3V Analog	3.3V Analog	3.3V Analog
26	AGDN	AGDN	AGDN
27	5.0 Digital	5.0 Digital	5.0 Digital
28	+12V Input	+12V Input	3.3 Digital
29	DGND	DGND	DGND
30	DGND	DGND	DGND
31	DGND	DGND	DGND
28	-12V Input	-12V Input	3.3 Digital

60 Pin High Speed Header (CN11)

Primary Signal | Secondary Signal(s) | Power / Ground / Reset | Clock | MIPI DSI

Pin	Function	Function	Pin
1	DGND	UART5_RX	2
3	DSI_CK_P	LCD_INT	4
5	DSI_CK_N	UART5_TX SPI2_NSS	6
7	DGND	SPDIFRX_IN0	8
9	DSI_D0_P	SPDIFRX_IN1 SPI2_NSS	10
11	DSI_D0_N	SPI3_SCK I2S3_CK	12
13	DGND	SPI3_MOSI I2S3_SD	14
15	DSI_D1_P	SPI3_MISO	16
17	DSI_D1_N	SPI3_NSS I2S3_WS DAC OUT 1 USB_OTG_HS_SOF	18
19	DGND	I2S2_MCK	20
21	5.0V Digital	SPI2_NSS I2S2_WS	22
23	5.0V Digital	SPI2_SCK I2S2_CK	24
25	nRST	SPI2_MISO	26
27	DGND	SPI2_MOSI I2S2_SD	28
29	DGND	USART1_TX SPI2_MISO	30
31	Si5351 CLK 3	3.3V Digital	32
33	SAI2_MCLK_A	USART1_RX SPI2_MOSI	34
35	SAI2_SCK_A	3.3V Digital	36
37	SAI2_SD_A	I2C2_SCL	38
39	SAI2_FS_A	I2C4_SDA	40
41	SAI2_SD_B	I2C2_SDA	42
43	SAI1_FS_A	I2C4_SCL	44
45	SAI1_SCK_A	ISPI5_MOSI	46
47	SAI1_SD_A	SPI5_SCK	48
49	DSI_TE	SPI5_MISO	50
51	DGND	3.3V Analog	52
53	LCD_BL_CTRL	I2C1_SDA	54
55	DGND	3.3V Analog	56
57	DSI_RESET	I2C1_SCL	58
59	-12V Input	+12V Input	60
P1	DGND	DGND	P2
P3	DGND	DGND	P4

10 Pin Header (CN4)

Pin	FTDI USB	Serial Wire Debug	Pin
1	DGND	SWO	2
3	DGND	nRST	4
5	DP	SWDIO	6
7	DM	DGND	8
9	VBUS	SWDCLK	10