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TLC5926 Datasheet(PDF) 19 Page - Texas Instruments

Part # TLC5926
Description  16-CHANNEL CONSTANT-CURRENT LED SINK DRIVERS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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TLC5926 Datasheet(HTML) 19 Page - Texas Instruments

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16-Bit Configuration Code and Current Gain
TLC5926, TLC5927
www.ti.com ....................................................................................................................................................................................................... SLVS677 – JULY 2008
Table 3. Overtemperature Detection(1)
STATE OF OUTPUT PORT
CONDITION
ERROR STATUS CODE
MEANING
Off
IOUT = 0 mA
0
On
Tj < Tj,trip global
1
Normal
On
→ all channels
Tj > Tj,trip global
All error status bits = 0
Global overtemperature
Off
Tj < Tj,trip channel n
1
Normal
On
On
→ Off
Tj > Tj,trip channel n
Channel n error status bit = 0
Channel n overtemperature
(1)
The global shutdown threshold temperature is approximately 170°C.
Bit definition of the Configuration Code in the Configuration Latch is shown in Table 4.
Table 4. Bit Definition of 8-Bit Configuration Code
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8–15
Meaning
CM
HC
CC0
CC1
CC2
CC3
CC4
CC5
Don't care
Default
1
1
1
1
1
1
1
1
X
Bit 7 is first sent into TLC5926/TLC5927 via SDI. Bits 1 to 7 {HC, CC[0:5]} determine the voltage gain (VG) that
affects the voltage at R-EXT and indirectly affects the reference current, Iref, flowing through the external resistor
at R-EXT. Bit 0 is the Current Multiplier (CM) that determines the ratio IOUT,target/Iref. Each combination of VG and
CM gives a specific Current Gain (CG).
• VG: the relationship between {HC,CC[0:5]} and the voltage gain is calculated as shown below:
VG = (1 + HC) × (1 + D/64) / 4
D = CC0 × 25 + CC1 × 24 + CC2 × 23 + CC3 × 22 + CC4 × 21 + CC5 × 20
Where HC is 1 or 0, and D is the binary value of CC[0:5]. So, the VG could be regarded as a floating-point
number with 1-bit exponent HC and 6-bit mantissa CC[0:5]. {HC,CC[0:5]} divides the programmable voltage
gain VG into 128 steps and two sub-bands:
Low voltage sub-band (HC = 0): VG = 1/4 ~ 127/256, linearly divided into 64 steps
High voltage sub-band (HC = 1): VG = 1/2 ~ 127/128, linearly divided into 64 steps
• CM: In addition to determining the ratio I
OUT,target/Iref, CM limits the output current range.
High Current Multiplier (CM = 1): IOUT,target/Iref = 15, suitable for output current range IOUT = 10 mA to 120 mA.
Low Current Multiplier (CM = 0): IOUT,target/Iref = 5, suitable for output current range IOUT = 5 mA to 40 mA
• CG: The total Current Gain is defined as the following.
VR-EXT = 1.26 V × VG
Iref = VR-EXT/Rext, if the external resistor, Rext, is connected to ground.
IOUT,target = Iref × 15 × 3
CM – 1 = 1.26 V/R
ext × VG × 15 × 3
CM – 1 = (1.26 V/R
ext × 15) × CG
CG = VG × 3CM – 1
Therefore, CG = (1/12) to (127/128) divided into 256 steps.
Examples
• Configuration Code {CM, HC, CC[0:5]} = {1,1,111111}
VG = 127/128 = 0.992 and CG = VG × 30 = VG = 0.992
• Configuration Code = {1,1,000000}
VG = (1 + 1) × (1 + 0/64)/4 = 1/2 = 0.5, and CG = 0.5
• Configuration Code = {0,0,000000}
VG = (1 + 0) × (1 + 0/64)/4 = 1/4, and CG = (1/4) × 3–1 = 1/12
After power on, the default value of the Configuration Code {CM, HC, CC[0:5]} is {1,1,111111}. Therefore,
VG = CG = 0.992. The relationship between the Configuration Code and the Current Gain is shown in Figure 15.
Copyright © 2008, Texas Instruments Incorporated
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Product Folder Link(s): TLC5926 TLC5927


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