The LPC2921/2923/2925 combine an ARM968E-S CPU core with two integrated TCM blocks operating at frequencies of up to 125 MHz, Full-speed USB 2.0 device controller, CAN and LIN, up to 40 kB SRAM, up to 512 kB flash memory, two 10-bit ADCs, and multiple serial and parallel interfaces in a single chip targeted at consumer, industrial, and communication markets. To optimize system power consumption, the LPC2921/2923/2925 has a very flexible Clock Generation Unit (CGU) that provides dynamic clock gating and scaling.
Feature
- ARM968E-S processor running at frequencies of up to 125 MHz maximum.
- Multi-layer AHB system bus at 125 MHz with three separate layers.
- Dual-master, eight-channel GPDMA controller on the AHB multilayer matrix whICh can be used with the Serial Peripheral Interface (SPI) interfaces and the UARTs, as well as for memory-to-memory transfers including the TCM memories.
- Up to 60 general-purpose I/O pins with programmable pull-up, pull-down, or bus keeper.
- Vectored Interrupt Controller (VIC) with 16 priority levels.
- Up to 16 level-sensitive external interrupt pins, including USB, CAN and LIN wake-up features.
- Configurable clock-out pin for driving external system clocks.
- Processor wake-up from power-down via external interrupt pins; CAN or LIN activity.
- Flexible Reset Generator Unit (RGU) able to control resets of individual modules.
- Second CGU (CGU1) with its own PLL generates a configurable clock output.
- Standard Arm® test and debug interface with real-time in-circuit emulator.
- Boundary-scan test supported.
- ETM/ETB debug functions with 8 kB of dedicated SRAM also accessible for application code and data storage.
- 144-pin LQFP package.
- -40 °C to +85 °C ambient operating temperature range.
- Two Tightly Coupled Memories (TCM), 16 kB Instruction TCM (ITCM), 16 kB Data TCM (DTCM).
- On the LPC2925, two separate internal StatIC RAM (SRAM) instances, 16 kB each.
- 8 kB ETB SRAM also usable for code execution and data.
- Up to 512 kB high-speed flash-program memory.
- 16 kB true EEPROM, byte-erasable and programmable.
- On the LPC2923 and LPC2921, one 16 kB SRAM block.
- USB 2.0 full-speed devICe controller with dedICated DMA controller and on-chip devICe PHY.
- Two-channel CAN controller supporting FullCAN and extensive message filtering
- Two LIN master controllers with full hardware support for LIN communication. The LIN interface can be configured as UART to provide two additional UART interfaces.
- Two 550 UARTs with 16-byte Tx and Rx FIFO depths, DMA support, and RS485/EIA-485 (9 bit) support.
- Three full-duplex Q-SPIs with four slave-select lines; 16 bits wide; 8 locations deep; Tx FIFO and Rx FIFO.
- Two I²C-bus interfaces.
- On-chip very low-power ring oscillator; fixed frequency of 0.4 MHz; always on to provide a Safe_Clock source for system monitoring.
- On-chip crystal oscillator with a recommended operating range from 10 MHz to 25 MHz. PLL input range 10 MHz to 25 MHz.
- On-chip PLL allows CPU operation up to a maximum CPU rate of 125 MHz.
- Generation of up to 11 base clocks.
- Seven fractional dividers.
- clock control of individual modules.
- allows minimization of system operating power consumption in any configuration.
- CPU operating voltage: 1.8 V ± 5 %.
- I/O operating voltage: 2.7 V to 3.6 V; inputs tolerant up to 5.5 V.
- Two 10-bit ADCs, 8-channels each, with 3.3 V measurement range provide 8 analog inputs each with conversion times as low as 2.44 μs per channel. Each channel provides a compare function to minimize interrupts.
- Multiple trigger-start option for all ADCs: timer, PWM, other ADC, and external signal input.
- Four 32-bit timers each containing four capture-and-compare registers linked to I/Os.
- Four six-channel PWMs (Pulse-Width Modulators) with capture and trap functionality.
- Two dedicated 32-bit timers to schedule and synchronize PWM and ADC.
- Quadrature encoder interface that can monitor one external quadrature encoder.
- 32-bit watchdog with timer change protection, running on safe clock.
