TLC5926_15 Datasheet, PDF (16/39 Pages) Texas Instruments – 16-Channel Constant-Current LED Sink Drivers

TLC5926, TLC5927
SLVS677C – JULY 2008 – REVISED OCTOBER 2015
www.ti.com
Device Functional Modes (continued)
Table 4. Truth Table in Normal Mode (continued)
CLK
↑
↓
↓
LE(ED1)
H
X
X
OE(ED2)
L
L
H
SDI
Dn + 2
Dn + 3
Dn + 3
OUT0...OUT15
Dn + 2...Dn – 5...Dn – 13
Dn + 2...Dn – 5...Dn – 13
off
SDO
Dn – 13
Dn – 13
Dn – 13
The signal sequence shown in Figure 8 makes the TLC592x enter Current Adjust and Error Detection mode.
1
2
3
4
5
CLK
OE(ED2) ¹
0
1
1
1
LE(ED1) ⁰
0
0
1
0
Figure 8. Switching to Special Mode
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 16-bit configuration latch (see Figure 9).
0
1
2
3
4
CLK
12 13 14 15
OE(ED2) ¹
LE(ED1) 0
SDI
16-bit configuration code
Figure 9. Writing Configuration Code
When the TLC592x is in the error detection mode, the signal sequence shown in Figure 10 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 10. Reading Error Status Code
The signal sequence shown in Figure 11 makes TLC592x resume the Normal mode. Switching to Normal mode
resets all internal Error Status registers. OE (ED2) always enables the output port, whether the TLC592x enters
current adjust mode or not.
16
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