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General description

The LPC2194 is based on a 16/32-bit ARM7TDMI-S CPU with real-time emulation and embedded trace support, together with 256 kB of embedded high-speed flash memory. A 128-bit wide memory interface and a unique accelerator architecture enable 32-bit code execution at maximum clock rate. For critical code size applications, the alternative 16-bit Thumb mode reduces code by more than 30 % with minimal performance penalty.

Features and benefits

Key features brought by LPC2194/01 devices

■ Fast GPIO ports enable port pin toggling up to 3.5 times faster than the original device. They also allow for a port pin to be read at any time regardless of its function.

■ Dedicated result registers for ADC(s) reduce interrupt overhead. The ADC pads are 5 V tolerant when configured for digital I/O function(s).

■ UART0/1 include fractional baud rate generator, auto-bauding capabilities and handshake flow-control fully implemented in hardware.

■ Buffered SSP serial controller supporting SPI, 4-wire SSI, and Microwire formats.

■ SPI programmable data length and master mode enhancement.

■ Diversified Code Read Protection (CRP) enables different security levels to be implemented. This feature is available in LPC2194/00 devices as well.

■ General purpose timers can operate as external event counters.

Key features common for all devices

■ 16/32-bit ARM7TDMI-S microcontroller in a tiny LQFP64 package.

■ 16 kB on-chip SRAM and 256 kB on-chip flash program memory. 128-bit wide interface/accelerator enables high speed 60 MHz operation.

■ In-System Programming (ISP) and In-Application Programming (IAP) via on-chip bootloader software. Flash programming takes 1 ms per 512 B line. Single sector or full chip erase takes 400 ms.

■ EmbeddedICE-RT and Embedded Trace interfaces offer real-time debugging with on-chip RealMonitor software as well as high speed real-time tracing of instruction execution.

■ Four interconnected CAN interfaces with advanced acceptance filters. Additional serial interfaces are two UARTs (16C550), Fast I2C-bus (400 kbit/s) and two SPIs.

■ Four channel 10-bit ADC with conversion time as low as 2.44 μs.

■ Two 32-bit timers (with four capture and four compare channels), PWM unit (six outputs), Real-Time Clock and Watchdog.

■ Vectored Interrupt Controller with configurable priorities and vector addresses.

■ Up to forty-six 5 V tolerant general purpose I/O pins. Up to nine edge or level sensitive external interrupt pins available.

■ Operating temperature range from -40 °C to +125 °C.

■ 60 MHz maximum CPU clock available from programmable on-chip Phase-Locked Loop with settling time of 100 μs.

■ On-chip crystal oscillator with an operating range of 1 MHz to 30 MHz.

■ Two low power modes, Idle and Power-down.

■ Processor wake-up from Power-down mode via external interrupt.

■ Individual enable/disable of peripheral functions for power optimization.

■ Dual power supply:

◆ CPU operating voltage range of 1.65 V to 1.95 V (1.8 V ± 0.15 V).

◆ I/O power supply range of 3.0 V to 3.6 V (3.3 V ± 10 %) with 5 V tolerant I/O pads.