Ideal for monitoring applications that may require ongoing feature upgrades for multiple services, the S3A7 MCU Group offers ample room for expansion and the optimal combination of low power and high performance, with an Arm® Cortex®-M4 CPU core running up to 48 MHz, 1 MB of flash memory, and 192 KB of SRAM. It includes an additional 12-bit D/A Converter as well as multiple 32-Bit General PWM timers and serial communications interfaces.

Note: For new designs, please consider the S3A1 Series with compatible features, improved scalability, and improved power efficiency. There are no plans to discontinue the S3A7 Series.

Industrial Flow Measurement

Indoor Outdoor Weather Station

Large on-chip SRAM and flash memory, as well as the capability to directly drive segment LCD glass panels and read capacitive touch buttons, make S3A7 Group MCUs a smart fit for applications such as a weather station panel. Rich audio input and output over a SSI interface, data logging to memory on a QSPI bus, and USB connectivity, offer new feature possibilities.

 48 MHz Arm® Cortex®-M4 CPU

 Memory

Code flash (1 MB)
Data flash (16 KB)
SRAM (192 KB)
Flash Cache
Memory Protection Unit
Memory Mirror Function

 Analog

14-Bit A/D Converter (28 ch.)
12-Bit D/A Converter x2
Low-Power Analog Comparator x2
High-Speed Analog Comparator x2
OPAMP x4
Temperature Sensor

 Timing & Control

General PWM Timer 32-Bit x10
Asynchronous General Purpose Timer x2
WDT

 HMI

Capacitive Touch Sensing Unit (31 ch.)
Segment LCD Controller

 Connectivity

USBFS
CAN | SDHI/MMC
Serial Communications Interface x6
IrDA Interface
QSPI | SPI x2
I2C x3 | SSI x2
External Memory Bus

 System & Power Management

DMA Controller (4 ch.)
Data Transfer Controller
Event Link Controller
Low Power Modes
Multiple Clocks
Port Function Select
RTC
SysTick
Low Voltage Detection

 Safety

ECC in SRAM
SRAM Parity Error Check
Flash Area Protection
ADC Diagnostics
Clock Frequency Accuracy Measurement Circuit
CRC Calculator
Data Operation Circuit
Port Enable Output for GPT
IWDT

 Security and Encryption

128-Bit Unique ID
TRNG
AES (128/256)
GHASH

Key Features:  S3A7 Series

PROCESSOR CORE
Package Type BGA, LGA, QFN, LQFP
Pin Count 64 to 144
Operating Voltage Range (V) 1.6 - 5.5
Operating Temperature Range (degC) -40 to 105
MEMORY
Code Flash (KB) 1024
Data Flash (KB) 16
SRAM (KB) 192
CONNECTIVITY
CAN (ch) 1
Serial Communiation Interface (ch) 6
IrDA 1
QSPI Yes/No
(depend on device)
SPI (ch) 2
External Memory Bus Yes/No
(depend on device)
USBFS Yes
SDHI Yes/No
(depend on device)
SYSTEM & POWER MANAGEMENT
DMA Controller (ch) 4
Data Transfer Controller 1
RTC 1
TIMING AND CONTROL
General PWM Timer 32-Bit (ch) 0
Asynchronous General purpose Timer 2
WDT 1
ANALOG
12-Bit A/D Converter (ch) 0
14-Bit A/D Converter (ch) 18 to 28
16-Bit A/D Converter (ch) 0
24-Bit Sigma-Delta A/D Converter (ch) 0
12-Bit D/A Converter (ch) 2
8-Bit D/A Converter (ch) 0
General PWM Timer 16-Bit (ch) 0
High-Speed Analog Comparator (ch) 2
Low-Power Analog Comparator (ch) 2
OPAMP (ch) 3 to 4 
Temperature Sensor (ch) 1
HMI
Capacitive Touch Sensing Unit (ch) 10 to 27
Segment LCD Controller Yes/No
(depend on device)
SECURITY AND ENCRYPTION
128-bit Unique ID Yes
TRNG Yes
AES (128/256) Yes
GHASH Yes
Safety Yes
ECC SRAM Yes

Pin Count / Memory Size Lineup:

Program Flash
SRAM

1024KB
192KB
Pins
Package
64
LQFP
100
LGA
121
BGA
144
LQFP
145
LGA
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