TB62709FG Ver la hoja de datos (PDF) - Marktech Optoelectronics
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TB62709FG Datasheet PDF : 26 Pages
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TB62709NG/FG
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.
The serial data in the 16−bit shift register are used as follows : the four bits D15 (MSB) to D12 select the IC
operating mode (Table 1), while D11 to D8 select the register corresponding to the operating mode (Table 2).
Bits D7 to D0 (LSB) of the 16−bit shift register are used for detail settings, such as number of digits in use,
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
external source into the D15 (MSB) to D8 bits of the shift register, operating mode and the corresponding
register selection data. On the subsequent falling edge, the detail setting data of D7 to D0 (LSB) are loaded.
Normally LOAD is Low. After a serial transfer of 16bits, the input of a High−level pulse loads the data.
Note the following caution : Use the D15 to D8 setting and the D7 to D0 detail data setting as a pair. If only the
D7 to D0 data are input without setting D15 to D8 an error condition may result, in which the device will not
operate normally. If the current mode is set again by a new signal, the data for D15 to D8 must also be re−input.
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.
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2005-10-06
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