TB62709NG/FG

2005-10-06

5

DESCRIPTION OF OPERATION

Data input (SERIAL−IN, CLOCK, LOAD)

The data are input serially using the SERIAL−IN pin. The data input interface consists of a total of three

inputs : SERIAL−IN, LOAD, and CLOCK.

Binary code stored in the 16−bit shift register offers control modes including duty Control Register Set, Digitset,

Decode Set, and Standby Set,

The data are shifted on the rising edge of the clock, starting from the MSB. Cascade−connecting TB62709NG or

TB62709FG devices provides capability for controlling a larger number of digits.

character settings in each digit, and light intensity.

The internal registers are loaded on the rising edge of the LOAD signal, which causes loading of data from an

Normally LOAD is Low. After a serial transfer of 16bits, the input of a High−level pulse loads the data.

Operating precautions

At power−on or after operation in Clear mode (in initial state), set the IC to Normal mode again. Otherwise, the

IC will not drive the LED.

Operating the IC in Blank mode (all lights off) or in All On mode (all lights lit) does not affect the internal data.

Setting the IC to Normal mode again continues the LED lighting in the state governed by the settings made

immediately before mode change.

Normal mode (not Shut Down, Clear, Blank, or All On mode) continues the operations set in Load Register

mode. In Normal mode, operations are governed by any new settings made in the Load Register, as soon as the

changed setting values are loaded.