FM3 CY9Ax3x-Series Ultra Low Leakage Arm® Cortex®-M3 Microcontroller (MCU) Family | Cypress Semiconductor

FM3 CY9Ax3x-Series Ultra Low Leakage Arm® Cortex®-M3 Microcontroller (MCU) Family

The Cypress FM3 family of 32-bit general-purpose MCUs is based on the Arm® Cortex®-M3 CPU, which provides a scalable platform for many consumer and industrial applications. Popular applications range from motor control, factory automation, white goods and power tools to medical devices, major home appliances, digital consumer devices and office automation equipment. The FM3 CY9AFx3x-Series is part of the ultra-low-leakage group and designed for low-power applications. This series is available with up to 20MHz of CPU speed with an operating voltage range of 1.8V to 5.5V and a low leakage current of 0.4µA (at Deep Standby Stop mode).

CY9Ax3x -Series Features

Ultra Low Leakage MCU Subsystem

  • 20-MHz Arm® Cortex®​​-M3 CPU with 1.8V to 5.5V operating voltage
  • Up to 128KB flash, 8KB SRAM
  • Low leakage current – 0.4µA at Deep Standby Stop mode
  • Low power consumption mode

Digital Subsystem

  • 1x Multi-Function Timers (MFT)
  • 3x Programmable Pulse Generators (PPG)
  • Up to 8x Base Timers
  • 1x Dual Timer, 1x Watch Counter
  • Up to 8x Multi-Function Serial (MFS) interfaces configurable as SPI, UART, I2C

Analog Subsystem

  • 1x 12-bit, 1-Msps ADCs with a 8-channel multiplexer input
  • 4MHz high-speed internal oscillator


  • 48/64-pin LQFP
  • 48/64-pin QFN

CY9Ax3x-Series Block Diagram

CY9Ax3x Series Block Diagram

Function Differences between each Ultra Low Leakage Line by part

Series CYAAAx CY9A1Ax CY9A13x
Flash/SRAM(KB) 128/16 128/16 128/8
GPIO 84 84 52
MFS 8 8 8
HDMI-CEC 2 2 -
ADC 16 16 8
DAC 2 2 -

44SEG x 4COM or

40SEG x 8COM (Max)

- -
FM3 CY9Ax3x-Series Datasheets
  • The FM3 CY9Ax3x-Series datasheets are intended to provide quick reference for this FM3 series.
FM3 CY9Ax3x-Series Flash Specifications
  • Flash Programming Manual explains the functions, operations and serial programming of the flash memory for FM3 CY9Ax3x-Series devices. This manual is intended for engineers engaged in the actual development of products using the FM3 devices.
FM3 CY9Ax3x-Series Technical Reference Manual
  • The FM3 Technical Reference Manual provides detailed information on the device features and how they work. It is intended for advance user's who want to understand what's going on under the hood.
Application Notes

Peripheral Driver Library

FM MCU Peripheral Driver Library (PDL)

The FM MCU Peripheral Driver Library (PDL) simplifies software development for the FM0+, FM3, and FM4 MCU families. The PDL reduces the need to understand register usage and bit structures, thus easing software development for the extensive set of peripherals in the FM families. You configure the library for the particular device, and then use API calls to initialize and use a peripheral. Using the PDL makes it easier to port code from one family to the other, because the same code supports all FM families.


Support Tools

Vendor Link Comments
IAR Systems!?architecture=ARM IAR Embedded Workbench for Arm 7.50.2 or later
Arm Keil Keil Embedded Development Tools for Arm 5.17 or later
GCC Arm Embedded GCC Arm Embedded 4.9-2015-q1-update or later
iSystem iSYSTEM winIDEA 9.12 or later



Click on the link below to download the tool

Product Description
Pin and Code Wizard Tool that helps set the IO ports for Cypress's 32-bit Arm Cortex FM MCUs
Serial Port Viewer Tool Tool that is used to monitor all available com ports and provides a terminal emulator
CMSIS-DAP USB Drivers CMSIS-DAP is the interface firmware for a Debug Unit that connects the Debug Port to USB. Debuggers, which execute on a host computer, connect via USB to the Debug Unit and to the Device that runs the application software
FLASH Programmer Tool that converts RS232C data to readable data on your PC
USB Wizard Tools that supports editing USB descriptors and templates

The Sample Programs ("Programs") are offered for use in developing systems for Cypress microcontrollers.

The Programs will be useful in the following situations:

  • I need a simple sample program, as I am going to develop software. The sequence of resource access, among others, can be confirmed using these Programs.
  • I would like to examine, before development, whether each resource will operate as expected.
    The Programs support several specifications, even for the operation of one resource.
  • If resources do not operate properly on my system, I would like software for which confirmation of operation has been completed. Cypress has confirmed the actual operation of the Programs on each of its microcontrollers, so you will be able to compare your program with the Program.

For the FM portfolios, code examples are provided with the Peripheral Driver Library (PDL). Download and install the PDL, and look in the examples folder.