FM320X FMSH Low-Power MCU

The FMSH FM320X is a low-power mcu that runs from 4.5V~5.5V over -40℃~85℃.

Key Specifications

Features

• ¾ Operating voltage range:：4.5~5.5V
• ¾ Operating Current ：15mA
• ¾ Temperature range：‐40℃~+85℃ Ø Static power：0.2W，dynamic power increase 0.3W ¾ UART communicatio rate bps Adaptive SSOP24/QFN48 Package On‐chip source ¾ 32bit RISC MCU Core ¾ 320Kbytes FLASH ROM ¾ 16Kbytes RAM
• ¾ Three independent hardware UARTs, supports infrared modulation output ¾ One I2C interface ¾ One SPI interface
• ¾ Six input capture functio
• ¾ Six output compare functio
• ¾ One 12‐bits ADC with max 3.2Msps
• ¾ One 12‐bits DAC with max 3.2Msps

Design Notes

• Low-power MCUs spend most of their life in sleep. Compare the datasheet current figures in the modes you actually use — active, sleep, and RTC-only — rather than the headline number.
• Flash and RAM figures are the on-chip totals. The LCD segment buffer and any bootloader consume part of the RAM, so confirm the usable remainder against your firmware.
• ISO 7816 channels are driven from the same pin group as the UARTs on some parts. Check the pin-out table before assuming all channels are simultaneously available.
• Operating voltage range matters at both ends: the low end sets the battery cut-off, the high end decides whether the part survives a programming supply or a failing cell stack.

Common Questions

How much program memory is available?

the on-chip Flash of on-chip Flash, with the on-chip RAM of the on-chip RAM. Part of the the on-chip RAM is reserved for the LCD buffer and the bootloader, so confirm the remainder against the firmware image.

What is the operating voltage range?

4.5V~5.5V. The low end sets the battery cut-off point; the high end covers programming and transient conditions.

How many serial channels does it have?

12. Check the pin-out table for channels that share pins with the ISO 7816 interface before allocating them in firmware.

What is the operating temperature range?

-40℃~85℃, which covers outdoor meter enclosures without additional heating.