TLC5916-Q1_16 Datasheet, PDF (19/34 Pages) Texas Instruments – 8-Bit Constant-Current LED Sink Drivers

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TLC5916-Q1, TLC5917-Q1
SLVS814A – JANUARY 2008 – REVISED MAY 2015
In the Current Adjust mode, sending the positive pulse of LE(ED1), the content of the Shift register (a current
adjust code) is written to the 8-bit configuration latch (see Figure 12).
0
1
2
3
CLK
6
7
OE(ED2) ¹
LE(ED1) 0
SDI
8-bit Configuration Code
Figure 12. Writing Configuration Code
When the TLC591x-Q1 is in the Error Detection mode, the signal sequence shown in Figure 13 enables a
system controller to read error status codes through SDO.
CLK
1
2
3
OE(ED2) 1
>2 µs
LE(ED1) 0
SDO
Error Status Code
Figure 13. Reading Error Status Code
The signal sequence shown in Figure 14 makes TLC591x-Q1 resume the Normal mode. Switching to Normal
mode resets all internal Error Status registers. OE(ED2) always enables the output port, whether the TLC591x-
Q1 enters Current Adjust mode or not.
1
2
3
4
5
CLK
OE(ED2) 1
0
1
1
1
LE(ED1) ⁰
0
0
0
0
Figure 14. Switching to Normal Mode
9.4.1 Operation Mode Switching
In order to switch between its two modes, TLC591x-Q1 monitors the signal OE(ED2). When an one-clock-wide
pulse of OE(ED2) appears, TLC591x-Q1 enters the two-clock-period transition phase, the Mode Switching
phase. After power on, the default operation mode is the Normal Mode (see Figure 15).
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