16-bit metering MCU with integrated sigma-delta and LCD drive
It packs 256KB of Flash program memory and 32K x 8 of RAM, with a rich set of integrated peripherals including six 24-bit sigma-delta analog-to-digital converters and a direct LCD driver.
What the 24-bit sigma-delta converter means for the BOM
Six independent 24-bit sigma-delta ADCs on-chip eliminate the need for external analog front-ends in multi-channel sensing applications. For a three-phase energy meter, each phase plus neutral can have a dedicated converter channel, keeping the bill of materials compact and the measurement path tightly matched. The 90 I/O lines and connectivity set (I²C, SPI, UART/USART, LIN, IrDA) handle communication with external meters, modems, or data concentrators without a separate interface MCU.
Obsolete — sourcing path for production and repair
No last-time-buy window or official successor order code appears in the current records. For existing designs that require this exact MCU, procurement will need to rely on independent distribution and surplus inventory channels.
Package and mounting considerations
Housed in a 128-LQFP package with a 20x14 mm body, this is a surface-mount device intended for standard reflow assembly. The 0.4 mm pitch requires careful PCB layout and solder paste control. MSL rating should be verified on the reel label before reflow — typical for this package family is MSL 3, meaning a bake is needed if the moisture barrier bag has been open beyond the floor-life window.