FM3316 FMSH Low-Power MCU

The FMSH FM3316 is a low-power mcu that runs from 1.8V~5.5V over -40℃~85℃.

Key Specifications

Features

• Operating Voltage Range: 1.8~5.5V
• Operating Temperature Range: -40℃~+85℃
• Typical current consumptio Active：150uA/MH Standby：10uA@32KH Sleep：5uA DeepSleep：2uA
• Stop with RTC and RAM data retention：1uA DeepStop：0.5uA
• Ultra low power mode rapid awakening
• Sleep mode awaken time: 5us
• Stop mode awaken time: 10us
• 16-bit processor core compliant to 8xC251

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?

1.8V~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?

4. 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.