M254/M256/M258 Low Power LCD Series
The NuMicro M254/M256/M258 series 32-bit low-power microcontroller is based on Arm Cortex-M23 core using Armv8-M architecture with COM/SEG LCD display driver and capacitive touch key functions; an USB 2.0 full speed device is also equipped to support the communication with PC/Mobile accessories. It runs up to 48 MHz and features up to 256 Kbytes Flash memory, up to 32 Kbytets SRAM, 1.75V ~ 5.5V wide operating voltage, 5V I/O tolerance, and -40℃ to +105℃ operating temperature.
The M254/M256/M258 series provides low power consumption in Normal Run mode 110 μA/MHz at 48 MHz, Power-down mode with 3.8 μA while RTC on and RAM retention, and it can supports down to 2.2uA while RTC off, and Deep Power-down mode is down to 1.6 μA. The M254/M256/M258 series integrates RTC with independent VBAT voltage source pin to support low power mode with main power off and VBAT only.
An 8 x 44, 6 x 46, 4 x 48 COM/SEG LCD is available on the M254/M256/M258 series. The COM/SEG LCD driver with selectable bias voltage and duty, and it also built-in charge-pump to support 3V to 5V wide voltage of LCD panel; Capacitive touch sensing function with up to 24 touch-keys with single-scan or programmable periodic key-scans is supported by M256/M258 series; The M258 series supports a crystal-less USB 2.0 full speed device, compling with USB Battery Charging Detection v1.2 (BC 1.2) profile for high-speed battery charging.
The M254/M256/M258 series is equipped with plenty of peripherals such as Timers, Watchdog Timers, RTC, up to 8 channels of PDMA, 4 sets of UART, 2 sets of Universal Serial Control Interface (USCI), 2 sets of SPI/ I²S, 2 sets of I²C, 1 set of ISO-7816-3, up to 12 channels of basic PWM, making it highly suitable for connecting comprehensive external modules. It also integrates high performance analog circuit, such as 16 channels of 12-bit 730 kSPS ADC, up to 2 sets of 12-bit 1 MSPS DAC, and a temperature sensor to reduce external components.
Supported packages include LQFP44, LQFP64, LQFP80 and LQFP128, those are pin-compatible to M251/M252, M031 and M480 series to make the system design and parts change on functional enhancement easily.
Target Application:
- Handheld Devices
- Thermostat with Smart LCD Display and Touch Key input
- Smart Home Appliance
- Industrial Control / Industrial Automation
- Temperature/Humidity Logger
Key Features:
| • | Operating Characteristics | |
| - | Voltage range: 1.75V ~ 5.5V | |
| - | Temperature range: - 40 ℃ ~ 105 ℃ | |
| - | EFT 4.4 KV | |
| - | ESD HBM 7 KV | |
| • | Core | |
| - | Arm Cortex-M23 core using Armv8-M architecture, running up to 48 MHz, without TrustZone | |
| - | 32-bit hardware multiplier/divider | |
| • | Memories | |
| - | Up to 256 KB Flash | |
| - | 32 KB SRAM | |
| - | 4 KB LDROM | |
| - | 1-region eXecute-Only-Memory (XOM) | |
| - | ISP/ICP/IAP programming | |
| • | Clocks | |
| - | 4 ~ 32 MHz external high speed crystal oscillator (HXT) for precise timing operation | |
| - | 32.768 kHz external low speed crystal oscillator (LXT) for RTC function and low-power system operation | |
| - | 48 MHz internal high speed RC oscillator (HIRC) for system operation (Factory pre-trimmed to ±0.25% and frequency deviation ±2.5% over entire temperature from -40°C ~ 105 °C) | |
| - | 4.032 MHz internal high speed RC oscillator (MIRC) for system operation | |
| - | 38.4 kHz internal low speed RC oscillator (LIRC) for Watchdog Timer and wake-up operation | |
| • | COM/SEG LCD Driver | |
| - | 8 x44, 6 x 46 & 4 x 48 COM/SEG LCD Driver | |
| - | Built-in charge-pump feature | |
| - | Supports 3V to 5V LCD panel | |
| - | Supports 1/2, 1/3 and 1/4 bias voltage | |
| - | Supports 1/4 duty, 1/6 duty and 1/8 duty | |
| • | Capacitive Touch Sensing | |
| - | Up to 24+2 touch keys with single-scan or programmable periodic key-scans features | |
| • | Power management | |
| - | Integrated with Power-on Reset, Brown-out Reset and Low Voltage Reset | |
| - | Built-in LDO Integrated with Power-on Reset, Brown-out Reset and Low Voltage Reset | |
| - | Built-in LDO | |
| - | Support RTC with independent VBAT voltage source pin | |
| • | Low Power Consumption | |
| - | 110 μA/MHz in operating mode | |
| - | 3.8 μA in Power-down mode (RTC on, RAM retention) | |
| - | 2.2 μA in Power-down mode (RTC off, RAM retention) | |
| - | 1.6 μA in Deep Power-down mode | |
| • | Timers | |
| - | Up to four 32-bit timers | |
| - | One 24-bit SysTick timer | |
| - | One independent watchdog | |
| - | One window watchdog | |
| - | RTC with Calendar and Alarm | |
| • | PWM | |
| - | Up to 12-channel PWM | |
| - | Supports trigger ADC | |
| - | Supports independent mode for PWM output/Capture input channel | |
| - | Supports complementary mode for 3 complementary paired PWM output channels | |
| • | PDMA | |
| - | Up to 8 channels | |
| • | Analog | |
| - | Up to 16 channels of 12-bit 730 kSPS ADC | |
| - | Up to 2 sets of rail-to-rail analog comparators (ACMP) | |
| - | Up to 2 sets of 12-bit 1MSPS DAC | |
| • | Communication interfaces | |
| - | Up to 4 sets of UART interfaces | |
| - | Up to 2 sets of I²C interfaces | |
| - | Up to 2 sets of SPI/I²S interfaces | |
| - | Up to 1 set of Smart Card Interface (ISO-7816-3) | |
| - | Up to 2 sets of USCI (configured as UART, SPI or I²C) | |
| - | words | |
| • | USB | |
| - | Up to 1 set of USB 2.0 full speed device with on-chip PHY (crystal-less design) | |
| - | Supports USB Battery Charging Detection v1.2 (BC 1.2) profile | |
| • | Development Platform Support | |
| - | Arm Keil MDK and IAR EWARM IDE support for debugging | |
| - | Free GNU compiler with Eclipse IDE support | |
| - | ICP (In Circuit Programmer) support for updating internal code via Nu-Link debugger | |
| - | ISP (In System Programmer) support for updating internal code through UART, SPI, I2C, RS-485 peripheral interface | |
| - | PinView for real time monitor the status of all IO pins | |
| - | PinConfigure tool for pin assignment, initial code generation and OrCAD/Protel part generation | |
| - | ClockConfigure tool for generating the initial source code of system clock | |
| • | 96-bit Unique ID ( UID ) | |
| • | 128-bit Unique Customer ID ( UCID ) | |
| • | Packages | |
| - | LQFP44 (10 mm x 10 mm), LQFP64 (7 mm x 7 mm), LQFP80 (14 mm x 14 mm) , LQFP128 (14 mm x 14 mm) | |