TLC5929 Datasheet, PDF (22/36 Pages) Texas Instruments – 16-Channel, Constant-Current LED Driver with 7-Bit Global Brightness Control, Power-Save Mode

TLC5929
SBVS159 – APRIL 2011
www.ti.com
Function Control Data Bit Assignment
The function control data latch is 16 bits long and is used to adjust the output current values for LED brightness,
SID selection, LSD voltage level, output current for IDM, output on-time for IDM, and power-save mode
enable/disable. When the device powers on, the function control data latch is set to the default value (E67Fh).
The function control data latch truth tables are shown in Table 5 through Table 10.
BCALL
BITS[6:0]
0000000
0000001
∙∙∙
1111110
1111111
Table 5. Global Brightness Control (BC) Truth Table
DESCRIPTION
Output current of OUTn is set to I_OLCMax × 0%
I_OLCMax × 0.8%
∙∙∙
I_OLCMax × 99.2%
I_OLCMax × 100% (default value)
BIT 8
0
0
1
1
Table 6. SID Load Control Truth Table (see Table 11 for more details)
SIDLD
BIT 7
0
1
0
1
STATUS INFORMATION DATA (SID) LOADED TO THE COMMON SHIFT REGISTER
No data is loaded (default value)
LED open detection (LOD) or thermal error flag (TEF) data are loaded
LED short detection (LSD) or pre-thermal flag (PTF) data are loaded
Output leakage detection (OLD) or IREF pin short flag (ISF) data are loaded
BIT 10
0
0
1
1
LSDVLT
Table 7. LSD Threshold Voltage Truth Table
BIT 9
0
1
0
1
LED SHORT DETECTION (LSD) THRESHOLD VOLTAGE
V_LSD0 (0.35 × V_CC typ)
V_LSD1 (0.45 × V_CC typ)
V_LSD2 (0.55 × V_CC typ)
V_LSD3 (0.65 × V_CC typ, default value)
BIT 12
0
0
1
1
IDMCUR
BIT 11
0
1
0
1
Table 8. Current Select for IDM
SINK CURRENT AT OUTn FOR INVISIBLE DETECTION MODE (IDM)
IDM is disabled (default value)
2 µA (typ)
10 µA (typ)
20 µA (typ)
BIT 14
0
0
1
1
IDMTIM
BIT 13
0
1
0
1
Table 9. IDM Work-Time Truth Table
INVISIBLE DETECTION MODE (IDM) WORKING TIME
All outputs are turned on for 17 OSC clocks (0.85 µs typ)
All outputs are turned on for 33 OSC clocks (1.65 µs typ)
All outputs are turned on for 65 OSC clocks (3.25 µs typ)
All outputs are turned on for 129 OSC clocks (6.45 µs typ, default value)
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