TLC5929 Datasheet, PDF (18/36 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
Common Shift Register
The 17-bit common shift register is used to shift data from the SIN pin into the TLC5929. The data shifted into
the register are used for the output on/off control, global BC, and the control functions. The LSB of the common
shift register is connected to SIN and the MSB is connected to SOUT. On each rising edge of SCLK, the data on
SIN are shifted into the LSB and all 17 bits are shifted towards the MSB. The register MSB is always connected
to SOUT.
In addition, the status information data (SID) selected by the load select data in the control data latch are loaded
to the lower 16 bits of the common shift register when a rising edge is input on LAT and the MSB of the shift
register is '0'.
When the device is powered on, all 17 bits of the common shift register are set to '0'.
Output On/Off Data Latch
The output on/off data latch is 16 bits long and sets the on or off status for each constant-current output.
When BLANK is low, the output corresponding to the specific bit in the output on/off data latch is turned on if the
data is '1' and remains off if the data is '0'. When BLANK is high, all outputs are forced off, but the data in the
latch do not change as long as LAT does not latch in new data.
When the device is powered on, all bits in the data latch are set to '0'.
The output on/off data latch configuration is shown in Figure 21 and the data bit assignment is shown in Table 3.
From
Common Shift
Register
Output On/Off Data Latch (16 Bits)
16 Bits
MSB
OUTON OUTON OUTON OUTON OUTON
15
14
13
12
11
15
14
13
12
11
LSB
OUTON OUTON OUTON OUTON OUTON
4
3
2
1
0
4
3
2
1
0
16 Bits
To
Output On/Off
Control Circuit
Figure 21. Output On/Off Data Latch Configuration
Table 3. On/Off Control Data Latch Bit Assignment
BIT NUMBER
0
1
2
∙∙∙
13
14
15
BIT NAME
OUTON0
OUTON1
OUTON2
∙∙∙
OUTON13
OUTON14
OUTON15
CONTROLLED
CHANNEL
OUT0
OUT1
OUT2
∙∙∙
OUT13
OUT14
OUT15
DESCRIPTION
'0' = Output off
'1' = Output on with BLANK low. When
the device is powered on, all bits are set
to '0'.
18
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