Specifications:

Core Processor: 8051
Core Size: 8-Bit
Speed: 16MHz
Connectivity: I²C, SPI, UART/USART
Peripherals: Brown-out Detect/Reset, I²S, POR, PWM, WDT
Number of I/O: 18
Program Memory Size: 18KB (18K x 8)
Program Memory Type: FLASH
EEPROM Size: 4K x 8
RAM Size: 1K x 8
Voltage - Supply (Vcc/Vdd): 2.4V ~ 5.5V
Data Converters: A/D 8x12b
Oscillator Type: Internal
Operating Temperature: -40°C ~ 105°C (TA)
Mounting Type” Surface Mount
Package / Case: 20-TSSOP (0.173"", 4.40mm Width)