Electronic Design

Low-Cost ARM-Based Microcontrollers Maintain Powerful Edge

The small-sized 32-bit ARM CPU core, coupled with a suite of on-chip peripherals and flash memory, has let OKI craft a new family of low-cost, general-purpose microcontrollers. Priced competitively with some high-end 8- and 16-bit MCUs, the ARM-based chips establish a new price/performance point for 32-bit embedded processors. The ML674001, MLQ674002, and MLQ674003 combine the ARM7TDMI core along with a broad array of peripheral functions.

Although the ML674001 contains no flash memory, like the other family members, it includes 32 kbytes of SRAM, a boot ROM, a four-channel 10-bit ADC, seven 16-bit timers, a dual-stage 16-bit watchdog timer, two DMA channels, and two 16-bit pulse-width modulated channels. It also incorporates up to 43 pins of general-purpose I/O, multiple serial interfaces (SIO, UART, USART, and I2C), 28 interrupt sources, and a memory controller to support external SDRAM and other memory types.

The controllers can operate at 33 MHz from -40°C to 85 oC. Because the core is a member of the ARM family, all software-development tools for the ARM can be used to develop application software for this family of MCUs.

In 10,000-unit lots, the flashless ML674001 costs less than $5, the 256-kbyte MLQ674002, costs from $6 to $7, and the 512-kbyte MLQ674003 costs under $8. Samples are available from stock.

OKI Semiconductor
(408) 737-6206

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