LPC812M101JDH20FP is NXP's entry-level Cortex-M0+ microcontroller in the LPC800 series, featuring a small package, multi-UART interfaces and low-power design. Compared to the LPC811, the LPC812 increases Flash to 32KB and adds more communication interface options.

This chip uses the ARM Cortex-M0+ core, with the standout feature of integrating rich communication peripherals within the extremely compact TSSOP-20 package: 2 UART channels, 1 SPI and 1 I2C, capable of connecting multiple sensors or communication modules simultaneously. The built-in 12MHz internal RC oscillator (accuracy ±1%) meets UART communication accuracy requirements without external crystals, significantly reducing BOM cost and PCB area.

LPC812 supports Deep Power-down mode with current as low as approximately 1μA, and can be awakened externally via the WKUP pin, making it ideal for battery-powered IoT sensor nodes. The SWD debug interface supports full program download and in-circuit debugging with MCUXpresso IDE or LPCXpresso toolchain for an excellent development experience.

Note: For detailed electrical parameters, power consumption data and peripheral configuration, please refer to the official NXP datasheet. Parameters are subject to change without notice. Design engineers should verify all parameters before finalizing designs.

LPC812M101JDH20FP uses the standard TSSOP-20 (Thin Shrink Small Outline Package) with 0.65mm pin pitch, 20 gull-wing leads, package height approximately 1.0mm, suitable for compact PCB designs.

The TSSOP-20 package measures approximately 6.5mm x 4.4mm. Compared to DIP-20 (which requires through-hole plating), TSSOP saves approximately 60% of PCB area. Compared to QFN-20 (which requires bottom pad solder reflow process control), TSSOP offers better manufacturability and visual inspection accessibility. Pin assignments follow standard I/O arrangement with GPIO and power pins distributed on both sides.

The LPC812M101JDH20FP in TSSOP-20 package has 20 pins. Key pin definitions are as follows:

• Pin 1 - PIO0_0 / WKUP / CLKO: General-purpose GPIO, configurable as wake-up pin or clock output (CLKOUT), supports wake from Deep Power-down mode.
• Pin 2 - PIO0_1 / UART0_TXD: General-purpose GPIO, UART0 transmit data pin, can be mapped to any pin via switch matrix.
• Pin 3 - PIO0_2 / UART0_RXD: General-purpose GPIO, UART0 receive data pin, supports UART wake functionality.
• Pin 4 - PIO0_3 / SDA / UART1_TXD: General-purpose GPIO, configurable as I2C data pin (SDA) or UART1 transmit pin.
• Pin 5 - PIO0_4 / SCL / UART1_RXD: General-purpose GPIO, configurable as I2C clock pin (SCL) or UART1 receive pin.
• Pin 6 - VSS (Ground): Chip ground pin, should be connected to PCB ground plane via short wide trace.
• Pin 7 - VDD (Power): Chip power pin, typically 3.3V, recommended to place 100nF decoupling capacitor nearby.
• Pin 8 - PIO0_5 / SPI_SCK / U0_SCLK: General-purpose GPIO, SPI clock pin or UART0 clock input.
• Pin 9 - PIO0_6 / SPI_MISO / SPI_MOSI: General-purpose GPIO, SPI MISO/MOSI, supports full-duplex communication.
• Pin 10 - PIO0_7 / SPI_SSEL: General-purpose GPIO, SPI slave select pin, active low.
• Pin 11 - PIO0_8 / CT16B0_CAP0: General-purpose GPIO, 16-bit timer 0 capture pin.
• Pin 12 - PIO0_9 / CT16B0_MAT0: General-purpose GPIO, 16-bit timer 0 match output pin, can output PWM signals.
• Pin 13 - PIO0_10 / CT16B0_MAT1: General-purpose GPIO, 16-bit timer 0 match output 1.
• Pin 14 - PIO0_11 / SWDIO: Debug interface data line, SWD protocol bidirectional data pin, also usable as GPIO.
• Pin 15 - PIO0_12 / SWCLK: Debug interface clock line, SWD protocol clock pin, also usable as GPIO.
• Pin 16 - PIO0_13 / UART2_TXD / UART1_RTS: General-purpose GPIO, UART2 transmit or UART1 request to send.
• Pin 17 - PIO0_14 / UART2_RXD / UART1_CTS: General-purpose GPIO, UART2 receive or UART1 clear to send.
• Pin 18 - PIO0_15 / UART2_SCLK: General-purpose GPIO, UART2 clock pin.
• Pin 19 - PIO0_16 / CT32B0_CAP0: General-purpose GPIO, 32-bit timer 0 capture pin.
• Pin 20 - PIO0_17 / RESET: External reset pin, active low, has internal pull-up resistor.

The following alternative parts are listed for reference. Before selecting an alternative, verify communication interface, supply voltage, security algorithm compatibility, and software API differences.

Selection Tips: When selecting alternatives, pay attention to: core architecture differences (Cortex-M0+ vs M0 vs AVR) affecting toolchain and driver code; Flash/SRAM capacity vs application requirements; package and pin layout compatibility with existing PCB; operating voltage range; and peripheral interface quantity and type matching.

NXP Semiconductors (NASDAQ: NXPI), headquartered in Eindhoven, Netherlands, is a leading global semiconductor company, formerly the semiconductor division of Philips. NXP's products cover automotive electronics, mobile communications, industrial IoT, consumer electronics and computing infrastructure. The LPC series ARM Cortex-M microcontrollers have gained significant market share in the global embedded market with their rich product portfolio, mature ecosystem tools and reliable quality.

The LPC800 series is NXP's entry-level Cortex-M0+ product line for IoT nodes and cost-sensitive applications, featuring small packages, rich interfaces and low BOM cost. As the high-end model in this series, the LPC812 integrates 2 UART, 1 SPI and 1 I2C in the compact TSSOP-20 package with flexible pin switch matrix configuration. NXP provides free MCUXpresso IDE and configuration tools, along with detailed reference manuals and application notes, significantly shortening product development cycles. The LPC series has comprehensive technical support and distribution channels in China.