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TLC5921DAP Datasheet(PDF) 8 Page - Texas Instruments |
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TLC5921DAP Datasheet(HTML) 8 Page - Texas Instruments |
8 / 14 page TLC5921 LED DRIVER SLLS390 – SEPTEMBER 1999 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PRINCIPLES OF OPERATION setting for constant output current value The constant current value is determined by external resistor, R(IREF) between IREF and GND. Refer constant output current characteristics shown on Figure 5 for this external resistor value. Note that more current flows if connect IREF to GND directly. constant output current operation When BLANK is low, the corresponding output is turned on if data latch value is 1, and turned off if data latch value is 0. When BLANK is high, all outputs are forced to turn off. If there is constant current output terminal left unconnected (includes LED disconnection), it should be lighted on after writing zero to corresponding data latch to its output. If this operation is not done, supply current through constant current driver will increase. shift register latch The shift register latch is configured with 16 × 1 bits. The 1 bit for constant current output data represents ON for constant current output if data is 1, or OFF if data is 0. The configuration of shift register latch is shown in below. (1 bits) OUT15 Data XLATCH (1 bits) OUT14 Data (1 bits) OUT1 Data (1 bits) OUT0 Data Data Latch 16 SOUT Shift Register 15 2 1 SIN SCLK Figure 3. Relationship Between Shift Register and Latch SOUT output timing selection By setting level of SOMODE, the SOUT output timing can be changed. When SOMODE is set to low, data is clocked out to SOUT synchronized on the rising edge of SCLK, and when SOMODE is set to high, data is clocked out to SOUT synchronized on the falling edge of SCLK. When SOMODE is set to high and shift operation is done, the data shift error can be prevented even though SCLK signal is externally buffered in serial. Note that the maximum data transfer rate in cascade operation is slower than that when SMODE is set to low. TSD (thermal shutdown) When the junction temperature exceeds the limit, TSD starts to function and turn constant current output off and XDOWN goes low. Since XDOWN is configured with open-collector output, the outputs of multiple ICs can be concatenated. To recover from constant current output off-state to normal operation, power supply should be turned off and then turned on after several seconds. |
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