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TLC5926 Datasheet(PDF) 19 Page - Texas Instruments |
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TLC5926 Datasheet(HTML) 19 Page - Texas Instruments |
19 / 31 page 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 Submit Documentation Feedback 19 Product Folder Link(s): TLC5926 TLC5927 |
Similar Part No. - TLC5926_10 |
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Similar Description - TLC5926_10 |
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