tb62709ng Marktech Optoelectronics, tb62709ng Datasheet - Page 5

• Manufacturer Part Number: tb62709ng
• Description: 7?segment Drivers With Built?in Decoders
• Manufacturer: Marktech Optoelectronics

DESCRIPTION OF OPERATION
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 D
operating mode (Table 1), while D11 to D
Bits D
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 D
register selection data. On the subsequent falling edge, the detail setting data of D
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 D
D
operate normally. If the current mode is set again by a new signal, the data for D
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.
Data input (SERIAL−IN, CLOCK, LOAD)
Operating precautions
7
to D
7
0
to D
data are input without setting D
0
(LSB) of the 16−bit shift register are used for detail settings, such as number of digits in use,
15
(MSB) to D8 bits of the shift register, operating mode and the corresponding
15
8
to D
15
select the register corresponding to the operating mode (Table 2).
to D
8
setting and the D
8
an error condition may result, in which the device will not
5
7
to D
0
detail data setting as a pair. If only the
15
(MSB) to D
15
7
to D
to D0 (LSB) are loaded.
8
TB62709NG/FG
must also be re−input.
12
select the IC
2005-10-06