TLC5948A Datasheet, PDF (22/50 Pages) Texas Instruments – 16-Channel, 16-Bit, ES-PWM, Full Self-Diagnosis LED Driver

TLC5948A
SBVS192 – MARCH 2012
www.ti.com
BLANK Bit
(Internal)⁽¹⁾
GSCLK
1234
32768
32769
32770
OUTn
(GSDATA = 000h)
OFF
ON
(V_OUTnH)
(V_OUTnL)
OUTn ^OFF
(GSDATA = 001h) _ON
OUTn ^OFF
(GSDATA = 002h) _ON
OUTn ^OFF
(GSDATA = 003h) _ON
See (2)
No drivers turn on when GS data are '0'.
t = GSCLK ´ 1
(V_OUTnH)
(V_OUTnL)
t = GSCLK ´ 2
(V_OUTnH)
(V_OUTnL)
t = GSCLK ´ 3
(V_OUTnH)
(V_OUTnL)
65535
65536
65537
1 2 34
OUTn ^OFF
(GSDATA = 7FFFh) _ON
OUTn ^OFF
(GSDATA = 8000h) _ON
OUTn ^OFF
(GSDATA = 8001h) _ON
t = GSCLK ´ 32767
t = GSCLK ´ 32768
t = GSCLK ´ 32769
(V_OUTnH)
(V_OUTnL)
(V_OUTnH)
(V_OUTnL)
(V_OUTnH)
(V_OUTnL)
OUTn OFF
(GSDATA = FFFDh) _ON
t = GSCLK ´ 65533
(V_OUTnH)
(V_OUTnL)
OUTn OFF
(GSDATA = FFFEh) _ON
t = GSCLK ´ 65534
(V_OUTnH)
(V_OUTnL)
OUTn OFF
(GSDATA = FFFFh) _ON
See (3)
t = GSCLK ´ 65535
See (4)
(V_OUTnH)
(V_OUTnL)
(1) The internal signal is generated when LAT inputs GS data with the display timing reset bit (TMGRST) set to '1'. This signal has the same
function as a BLANK = 1 pulse. Furthermore, the signal is generated at the 65,536th GSCLK when the auto display repeat bit (DSPRPT) is
set to '1'.
(2) The GS counter begins to count GSCLK pulses after the BLANK bit is set to '0' or when the LAT signal for a GS data write is input with
the display time reset mode enabled.
(3) OUTn turns on at the first GSCLK rising edge except when GS data are '0' after the BLANK bit is set to '0' or when the LAT signal for a
GS data write is input with the display time reset mode enabled.
(4) OUTn does not turn on again until BLANK is set to '1' once, except when the TMGRST or DSPRPT bits are '1'.
Figure 25. Conventional PWM Operation
Enhanced Spectrum (ES) PWM Control
In this PWM control, the total display period is divided into 128 display segments. The total display period is the
time from the first GS clock (GSCLK) to the 65,536th GSCLK input after the BLANK bit is set to '0'. Each display
segment has a maximum of 512 GSCLKs. The OUTn on-time changes, depending on the 16-bit GS data. Refer
to Table 6 for the sequence of information and to Figure 26 for the timing information.
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