2. Features

● Set display current drive layer internally, the current of segment is no less than 25mA, the

current of word is no less than 160mA.

● Display scan control dynamically, support 8×4 or 7×4, directly drive four bits number LED or

thirty two LEDs.

● Internal limit current, set eight level light control via space percentage.

● Set 28-key keyboard control, based on 7×4 matrix scan..

● Set pull-down resistor internal while key-press, glitter removable.

● Supply keyboard interrupt active with low-level, and supply key-press release token to check

the key is pressed or release.

● High speed two wires serial interface, the speed of clock varies from 0 to 4MHz, compatible

with I2C bus, save pins.

● Set turn on power to reset, 2.7V~5V power.

● Support low exhaust sleep mode to save energy, awoke via press key or command.

● Set clock surge circuit internally, the external clock or surge equipment is not necessary, resister

to be disturbed.

● Supply DIP18, SOP18 and SOP16 package without lead, compatible with RoHS, the function

and pins are part compatible with CH450 .