SiLabs said:
Features:
*    25 MIPS 8051 core
*    2 to 8 kB flash
*    512/256 Byte RAM options
*    12-bit 200 ksps, multi-channel ADC
*    Integrated 24.5 MHz (�±2% accuracy) oscillator
*    Integrated 80 kHz low frequency oscillator
*    Up to 18 GPIO's, 5 V tolerant
*    2 analog comparators
*    Precision voltage reference
*    3 PWM channels
*    SMBus/I2C, UART and SPI
*    4 16-bit timers
*    Independent watchdog timer
*    Power-on reset
*    Brown-out reset
*    On-chip debug
*    2.2 to 3.6 V input supply
*    -40 to 85 �°C and -40 to 125 �°C operating range
*    AEC-Q100 qualified
*    Packages:
*        SOIC16
*        QFN20 (3 mm x 3 mm)
*        QSOP24