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Ultra Low Power Consumption at 3.6 V

-130 μA/MHz Low-Power Active mode with dc-dc enabled

-120 nA sleep current w/ data retention; POR monitor enabled

-450 nA sleep mode with SmaRTClock

(internal LFO)

-600 nA sleep mode with SmaRTClock (ext. crystal)

-2 μs wakeup time; 1.5 μA analog settling time

12-Bit; 16 Ch. Analog-to-Digital Converter

-Up to 75 ksps (12-bit mode) or 300 ksps

(10-bit mode)

-External pin or internal VREF (no ext cap required)

-On-chip voltage reference; 0.5x gain allows measuring voltages up to twice the reference voltage

-Autonomous burst mode with 16-bit auto-averaging accumulator

-Integrated temperature sensor

Two Low Current Comparators

-Programmable hysteresis and response time

-Configurable as wake-up or reset source

Internal 6-Bit Current Reference

-Up to ±500 μA; source and sink capability

-Enhanced resolution via PWM interpolation

Integrated LCD Controller

-Supports up to 128 segments (32x4)

-LCD controller consumes only 400 nA for

32-segment static display

-Integrated charge pump for contrast control

Metering-Specific Peripherals

-DC-DC buck converter allows dynamic voltage scaling for maximum efficiency (250 mW output)

-Sleep-mode pulse accumulator with programmable switch, de-bounce and pull-up control; interfaces directly to metering sensor

-Data Packet Processing Engine (DPPE) includes hardware AES, DMA, CRC and encoding blocks for acceleration of wireless protocols

High-Speed 8051 μC Core

-Pipelined instruction architecture; executes 70 of instructions in 1 or 2 system clocks

Memory

-Up to 128 kB Flash; In-system programmable; Full read/write/erase functionality over supply range

-Up to 8 kB internal data RAM

Digital Peripherals

-57 or 34 port I/O; All 5 V tolerant with high sink

current and programmable drive strength

-Hardware SMBus? (I2C? Compatible), 2 x SPI?, and UART serial ports available concurrently

-Four general purpose 16-bit counter/timers

-Programmable 16-bit counter/timer array with six capture/compare modules and watchdog timer

Clock Sources

-Precision Internal oscillator: 24.5 MHz, 2 accuracy supports UART operation; spread-spectrum mode for reduced EMI

-Low power internal oscillator: 20 MHz

-External oscillator: Crystal, RC, C, or CMOS Clock

-SmaRTClock oscillator: 32 kHz Crystal or 16.4 kHz internal LFO

On-Chip Debug

-On-chip debug circuitry facilitates full-speed, non-intrusive in-system debug (no emulator required)

-Provides 4 breakpoints, single stepping

Packages

-76-pin DQFN (6 x 6 mm)

-40-pin QFN (6 x 6 mm)

-80-pin TQFP (12 x 12 mm)

Temperature Range: –40 to +85 °C