TLC5926, TLC5927
www.ti.com ....................................................................................................................................................................................................... SLVS677 – JULY 2008
16-CHANNEL CONSTANT-CURRENT LED SINK DRIVERS
FEATURES
1
• 16 Constant-Current Output Channels
• Output Current Adjusted By External Resistor
• Constant Output Current Range: 5 mA to
120 mA
• Constant Output Current Invariant to Load
Voltage Change
• Open-Load, Shorted-Load and
Overtemperature Detection
• 256-Step Programmable Global Current Gain
• Excellent Output-Current Accuracy:
– Between Channels: < ±6% (Max),
10 mA to 50 mA
– Between ICs: < ±6% (Max), 10 mA to 50 mA
2
•
•
•
•
•
30-MHz Clock Frequency
Schmitt-Trigger Input
3.3-V or 5-V Supply Voltage
Thermal Shutdown for Overtemperature
Protection
ESD Performance: 2-kV HBM
APPLICATIONS
•
•
•
•
•
General LED Lighting Applications
LED Display Systems
LED Signage
Automotive LED Lighting
White Goods
DESCRIPTION/ORDERING INFORMATION
The TLC5926/TLC5927 is designed for LED displays and LED lighting applications with open-load, shorted-load,
and overtemperature detection, and constant-current control. The TLC5926/TLC5927 contains a 16-bit shift
register and data latches, which convert serial input data into parallel output format. At the TLC5926/TLC5927
output stage, 16 regulated-current ports provide uniform and constant current for driving LEDs within a wide
range of VF (Forward Voltage) variations. Used in systems designed for LED display applications (e.g., LED
panels), TLC5926/TLC5927 provides great flexibility and device performance. Users can adjust the output
current from 5 mA to 120 mA through an external resistor, Rext, which gives flexibility in controlling the light
intensity of LEDs. TLC5926/TLC5927 is designed for up to 17 V at the output port. The high clock frequency, 30
MHz, also satisfies the system requirements of high-volume data transmission.
The TLC5926/TLC5927 provides a Special Mode in which two functions are included, Error Detection and
Current Gain Control. In the TLC5926/TLC5927 there are two operation modes and three phases: Normal Mode
phase, Mode Switching transition phase, and Special mode phase. The signal on the multiple-function pin
OE(ED2) is monitored, and when an one-clock-wide short pulse appears on OE(ED2), TLC5926/TLC5927 enters
the Mode Switching phase. At this time, the voltage level on LE(ED1) determines the next mode into which the
TLC5926/TLC5927 switches.
In the Normal Mode phase, the serial data is transferred into TLC5926/TLC5927 via SDI, shifted in the shift
register, and transferred out via SDO. LE(ED1) can latch the serial data in the shift register to the output latch.
OE(ED2) enables the output drivers to sink current.
In the Special Mode phase, the low-voltage-level signal OE(ED2) can enable output channels and detect the
status of the output current, to tell if the driving current level is enough or not. The detected error status is loaded
into the 16-bit shift register and shifted out via SDO, along with the CLK signal. The system controller can read
the error status to determine whether or not the LEDs are properly lit. In the Special Mode phase,
TLC5926/TLC5927 also allows users to adjust the output current level by setting a runtime-programmable
Configuration Code. The code is sent into TLC5926/TLC5927 via SDI. The positive pulse of LE(ED1) latches the
code in the shift register into a built-in 8-bit configuration latch, instead of the output latch. The code affects the
voltage at R-EXT and controls the output-current regulator. The output current can be adjusted finely by a gain
ranging from 1/12 to 127/128 in 256 steps. Therefore, the current skew between ICs can be compensated within
less than 1%, and this feature is suitable for white balancing in LED color-display panels.
1
2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated
TLC5926, TLC5927
SLVS677 – JULY 2008 ....................................................................................................................................................................................................... www.ti.com
ORDERING INFORMATION (1)
PACKAGE (2)
TA
PowerPAD™ – PWP
–40°C to 85°C
(1)
(2)
ORDERABLE PART NUMBER
Reel of 2000
W-SOIC – DW
Reel of 2000
SSOP – DBQ
Reel of 2000
TOP-SIDE MARKING
TLC5926IPWPR
Y5926
TLC5927IPWPR
Y5927
TLC5926IDWR
TLC5926I
TLC5927IDWR
TLC5927I
TLC5926IDBQR
TLC5926I
TLC5927IDBQR
TLC5927I
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
BLOCK DIAGRAM
OUT0
R-EXT
OUT1
OUT14 OUT15
I/O REGULATOR
VDD
8
OUTPUT DRIVER and
ERROR DETECTION
OE(ED2)
CONTROL
LOGIC
16
16
16-BIT OUTPUT
LATCH
LE(ED1)
CONFIGURATION
LATCHES
16
CLK
8
SDI
16-BIT SHIFT
REGISTER
SDO
16
2
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DBQ, DW, OR PWP PACKAGE
(TOP VIEW)
GND
SDI
CLK
LE(ED1)
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
1
24
2
23
3
22
4
5
21
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
VDD
R-EXT
SDO
OE(ED2)
OUT15
OUT14
OUT13
OUT12
OUT11
OUT10
OUT9
OUT8
Pin Descriptions
PIN NAME
DESCRIPTION
CLK
Clock input pin for data shift on rising edge
GND
Ground pin for control logic and current sink
LE(ED1)
Data strobe input pn
Serial data is transferred to the respective latch when LE(ED1) is high. The data is latched when LE(ED1) goes low.
Also, a control signal input for an Error Detection mode and Current Adjust mode (See Timing Diagram). LE(ED1) has
an internal pulldown.
OE(ED2)
Output enable pin. When OE (ED2)(active) is low, the output drivers are enabled; when OE(ED2) is high, all output
drivers are turned OFF (blanked). Also, a control signal input for an Error Detection mode and Current Adjust mode
(See Timing Diagram). OE(ED2) has an internal pull-up.
OUT0–OUT15
Constant-current output pins
R-EXT
Input pin used to connect an external resistor for setting up all output currents
SDI
Serial-data input to the Shift register
SDO
Serial-data output to the following SDI of next driver IC or to the microcontroller
VDD
Supply voltage pin
Diagnostic Features
OPEN-LOAD
DETECTION
SHORT TO GND
DETECTION
TLC5926
x
x
TLC5927
x
x
DEVICE (1)
(1)
SHORT TO VLED
DETECTION
x
The device has one single error register for all these conditions (one error bit per channel)
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Timing Diagrams
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15
CLK
OE(ED2)
1
LE(ED1)
0
SDI
off
OUT0
on
off
OUT1
on
off
OUT2
on
off
OUT3
on
off
OUT15
on
SDO
Don't care
Figure 1. Normal Mode
Truth Table in Normal Mode
CLK
LE(ED1)
OE(ED2)
SDI
OUT0...OUT15
SDO
↑
H
L
Dn
Dn...Dn – 7...Dn – 15
Dn – 15
↑
L
L
Dn + 1
No change
Dn – 14
↑
H
L
Dn + 2
Dn + 2...Dn – 5...Dn – 13
Dn – 13
↓
X
L
Dn + 3
Dn + 2...Dn – 5...Dn – 13
Dn – 13
↓
X
H
Dn + 3
off
Dn – 13
The signal sequence shown in Figure 2 makes the TLC5926/TLC5927 enter Current Adjust and Error Detection
mode.
1
2
3
4
5
OE(ED2)
1
0
1
1
1
LE(ED1)
0
0
0
1
0
CLK
Figure 2. Switching to Special Mode
4
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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 3).
0
1
2
3
4
12
13
14
15
CLK
OE(ED2)
1
LE(ED1)
0
16-bit configuration code
SDI
Figure 3. Writing Configuration Code
When the TLC5926/TLC5927 is in the error detection mode, the signal sequence shown in Figure 4 enables a
system controller to read error status codes through SDO.
1
2
3
CLK
>2 µs
OE(ED2)
1
LE(ED1)
0
SDO
Error status code
Figure 4. Reading Error Status Code
The signal sequence shown in Figure 5 makes TLC5926/TLC5927 resume the Normal mode. Switching to
Normal mode resets all internal Error Status registers. OE (ED2) always enables the output port, whether the
TLC5926/TLC5927 enters current adjust mode or not.
1
2
3
4
5
OE(ED2)
1
0
1
1
1
LE(ED1)
0
0
0
0
0
CLK
Figure 5. Switching to Normal Mode
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Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)
MIN
MAX
0
7
V
Input voltage
–0.4
VDD + 0.4
V
VO
Output voltage
–0.5
IOUT
Output current
IGND
GND terminal current
TA
Free-air operating temperature range
TJ
Operating junction temperature range
Tstg
Storage temperature range
ESD
Electrostatic-Discharge Capability V(HBMESD) (100 pF,
1.5 kΩ)
VDD
Supply voltage
VI
UNIT
20
V
120
mA
1920
mA
–40
85
°C
–40
150
°C
–55
150
°C
2
kV
Power Dissipation and Thermal Impedance
MIN
PD
Power dissipation
Mounted on JEDEC 4-layer board (JESD 51-7),
No airflow, TA = 25°C, TJ = 125°C
Mounted on JEDEC 4-layer board (JESD 51-5),
No airflow, TA = 25°C, TJ = 125°C
Mounted on JEDEC 1-layer board (JESD 51-3),
No airflow
θJA
Thermal impedance,
junction to free air
Mounted on JEDEC 4-layer board (JESD 51-7),
No airflow
Mounted on JEDEC 4-layer board (JESD 51-5),
No airflow
θJP
Thermal impedance, junction to pad
MAX
UNIT
DBQ package
1.6
DW package
2.2
PWP package
2.3
PWP package
2.9
DBQ package
99.8
DW package
80.5
PWP package
63.9
DBQ package
61.0
DW package
45.5
PWP package
42.7
PWP package
34.5
PWP package
2.0
°C/W
MIN
MAX
UNIT
3
5.5
V
17
V
W
°C/W
Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
TEST CONDITIONS
VDD
Supply voltage
VO
Supply voltage to the output pins OUT0–OUT15
VO ≥ 0.6 V
5
IO
Output current
DC test circuit
IOH
High-level output current
SDO
–1
mA
IOL
Low-level output current
SDO
1
mA
VIH
High-level input voltage
CLK, OE(ED2), LE(ED1), and SDI
0.7 × VDD
VDD
V
VIL
Low-level input voltage
CLK, OE(ED2), LE(ED1), and SDI
0
0.3 × VDD
V
6
VO ≥ 1 V
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120
mA
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Recommended Timing
VDD = 3 V to 5.5 V (unless otherwise noted)
TEST CONDITIONS
MIN
MAX
UNIT
tw(L)
LE(ED1) pulse duration
Normal mode
20
ns
tw(CLK)
CLK pulse duration
Normal mode
20
ns
tw(OE)
OE(ED2) pulse duration
Normal mode
1000
ns
tsu(D)
Setup time for SDI
Normal mode
7
ns
th(D)
Hold time for SDI
Normal mode
3
ns
tsu(L)
Setup time for LE(ED1)
Normal mode
18
ns
th(L)
Hold time for LE(ED1)
Normal mode
18
ns
tw(CLK)
CLK pulse duration
Error Detection mode
20
ns
tw(ED2)
OE(ED2) pulse duration
Error Detection mode
2000
ns
tsu(ED1)
Setup time for LE(ED1)
Error Detection mode
7
ns
th(ED1)
Hold time for LE(ED1)
Error Detection mode
10
ns
tsu(ED2)
Setup time for OE(ED2)
Error Detection mode
7
ns
th(ED2)
Hold time for OE(ED2)
Error Detection mode
10
fCLK
Clock frequency
Cascade operation, VDD = 3 V to 5.5 V
ns
30
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Electrical Characteristics
VDD = 3 V, TJ = –40°C to 125°C (unless otherwise noted)
PARAMETER
VO
TEST CONDITIONS
MIN
TYP
Supply voltage to the output pins
MAX
17
VO ≥ 0.6 V
5
UNIT
V
IO
Output current
VIH
High-level input voltage
0.7 × VDD
VDD
VIL
Low-level input voltage
GND
0.3 × VDD
Ileak
Output leakage current
VOH = 17 V
VOH
High-level output voltage
SDO, IOL = –1 mA
VOL
Low-level output voltage
SDO, IOH = 1 mA
Output current 1
VOUT = 0.6 V, Rext = 720 Ω,
CG = 0.992
Output current error, die-die
IOL = 26 mA, VO = 0.6 V,
Rext = 720 Ω, TJ = 25°C
±6
%
Output current error,
channel-to-channel
IOL = 26 mA, VO = 0.6 V,
Rext = 720 Ω, TJ = 25°C
±6
%
Output current 2
VO = 0.8 V, Rext = 360 Ω,
CG = 0.992
Output current error, die-die
IOL = 52 mA, VO = 0.8 V,
Rext = 360 Ω, TJ = 25°C
±6
%
Output current error,
channel-to-channel
IOL = 52 mA, VO = 0.8 V,
Rext = 360 Ω, TJ = 25°C
±6
%
IOUT vs
VOUT
Output current vs
output voltage regulation
VO = 1 V to 3 V, IO = 26 mA
IOUT vs VDD
Output current vs supply voltage
VDD = 3.0 V to 5.5 V,
IO = 26 mA/120 mA
Pullup resistance
OE(ED2)
250
500
800
kΩ
Pulldown resistance
LE(ED1)
250
500
800
kΩ
150
175
200
°C
IO(1)
IO(2)
VO ≥ 1 V
120
TJ = 25°C
0.5
TJ = 125°C
1
VDD – 0.4
26
mA
%/V
±1
Restart temperature hysteresis
IOUT,Th
Threshold current for open error
detection
IOUT,target = 5 mA to 120 mA
VOUT,TTh
Trigger threshold voltage for
short-error detection
(TLC5927 only)
IOUT,target = 5 mA to 120 mA
2.4
VOUT,RTh
Return threshold voltage for
short-error detection
(TLC5927 only)
IOUT,target = 5 mA to 120 mA
2.2
8
V
±0.1
Thys
(1)
µA
mA
52
Overtemperature shutdown (1)
Supply current
V
V
0.4
Tsd
IDD
mA
15
°C
0.5 × Itarget
%
2.6
3.1
V
V
OUT0–OUT15 = off, Rext = Open, OE
= VIH
10
OUT0–OUT15 = off, Rext = 720 Ω,
OE = VIH
14
OUT0–OUT15 = off, Rext = 360 Ω,
OE = VIH
18
OUT0–OUT15 = off, Rext = 180 Ω,
OE = VIH
20
OUT0–OUT15 = on, Rext = 720 Ω,
OE = VIL
14
OUT0–OUT15 = on, Rext = 360 Ω,
OE = VIL
18
OUT0–OUT15 = on, Rext = 180 Ω,
OE = VIL
20
mA
Specified by design
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Electrical Characteristics
VDD = 5.5 V, TJ = –40°C to 125°C (unless otherwise noted)
PARAMETER
VO
TEST CONDITIONS
MIN
TYP
Supply voltage to the output pins
MAX
17
VO ≥ 0.6 V
5
UNIT
V
IO
Output current
VIH
High-level input voltage
0.7 × VDD
VDD
VIL
Low-level input voltage
GND
03 × VDD
Ileak
Output leakage current
VOH = 17 V
VOH
High-level output voltage
SDO, IOL = –1 mA
VOL
Low-level output voltage
SDO, IOH = 1 mA
Output current 1
VOUT = 0.6 V, Rext = 720 Ω,
CG = 0.992
Output current error, die-die
IOL = 26 mA, VO = 0.6 V,
Rext = 720 Ω, TJ = 25°C
±6
%
Output current error,
channel-to-channel
IOL = 26 mA, VO = 0.6 V,
Rext = 720 Ω, TJ = 25°C
±6
%
Output current 2
VO = 0.8 V, Rext = 360 Ω,
CG = 0.992
Output current error, die-die
IOL = 52 mA, VO = 0.8 V,
Rext = 360 Ω, TJ = 25°C
±6
%
Output current error,
channel-to-channel
IOL = 52 mA, VO = 0.8 V,
Rext = 360 Ω, TJ = 25°C
±6
%
IOUT vs
VOUT
Output current vs
output voltage regulation
VO = 1 V to 3 V , IO = 26 mA
IOUT vs VDD
Output current vs supply voltage
VDD = 3.0 V to 5.5 V,
IO = 26 mA/120 mA
Pullup resistance
OE(ED2),
250
500
800
kΩ
Pulldown resistance
LE(ED1),
250
500
800
kΩ
150
175
200
°C
IO(1)
IO(2)
VO ≥ 1 V
120
TJ = 25°C
0.5
TJ = 125°C
1
VDD – 0.4
26
V
mA
±0.1
%/V
±1
Thys
Restart temperature hysteresis
IOUT,Th
Threshold current for open error
detection
IOUT,target = 5 mA to 120 mA
VOUT,TTh
Trigger threshold voltage for
short-error detection
(TLC5927 only)
IOUT,target = 5 mA to 120 mA
2.4
VOUT,RTh
Return threshold voltage for
short-error detection
(TLC5927 only)
IOUT,target = 5 mA to 120 mA
2.2
(1)
µA
mA
52
Overtemperature shutdown (1)
Supply current
V
V
0.4
Tsd
IDD
mA
15
°C
0.5 × Itarget
%
2.6
3.1
V
V
OUT0–OUT15 = off, Rext = Open, OE
= VIH
11
OUT0–OUT15 = off, Rext = 720 Ω,
OE = VIH
17
OUT0–OUT15 = off, Rext = 360 Ω,
OE = VIH
18
OUT0–OUT15 = off, Rext = 180 Ω,
OE = VIH
25
OUT0–OUT15 = on, Rext = 720 Ω,
OE = VIL
17
OUT0–OUT15 = on, Rext = 360 Ω,
OE = VIL
18
OUT0–OUT15 = on, Rext = 180 Ω,
OE = VIL
25
mA
Specified by design
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Switching Characteristics
VDD = 3 V, TJ = –40°C to 125°C (unless otherwise noted)
MIN
TYP
MAX
UNIT
tPLH1
Low-to-high propagation delay time, CLK to OUTn
PARAMETER
TEST CONDITIONS
35
65
105
ns
tPLH2
Low-to-high propagation delay time, LE(ED1) to OUTn
35
65
105
ns
tPLH3
Low-to-high propagation delay time, OE(ED2) to OUTn
35
65
105
ns
tPLH4
Low-to-high propagation delay time, CLK to SDO
20
45
ns
tPHL1
High-to-low propagation delay time, CLK to OUTn
200
300
470
ns
tPHL2
High-to-low propagation delay time, LE(ED1) to OUTn
200
300
470
ns
tPHL3
High-to-low propagation delay time, OE(ED2) to OUTn
200
300
470
ns
tPHL4
High-to-low propagation delay time, CLK to SDO
20
40
ns
tw(CLK)
Pulse duration, CLK
tw(L)
Pulse duration LE(ED1)
tw(OE)
Pulse duration, OE(ED2)
tw(ED2)
Pulse duration, OE(ED2) in Error Detection mode
th(ED1,ED2)
Hold time, LE(ED1), and OE(ED2)
th(D)
Hold time, SDI
VIH = VDD, VIL = GND,
Rext = 360 Ω, VL = 4 V,
RL = 44 Ω, CL = 70 pF,
CG = 0.992
tsu(D,ED1,ED2) Setup time, SDI, LE(ED1), and OE(ED2)
20
ns
20
ns
1000
ns
2
µs
10
ns
5
ns
7
ns
ns
th(L)
Hold time, LE(ED1), Normal mode
18
tsu(L)
Setup time, LE(ED1), Normal mode
18
tr
Rise time, CLK (1)
(1)
ns
500
ns
tf
Fall time, CLK
500
ns
tor
Rise time, outputs (off)
245
ns
tof
Rise time, outputs (on)
600
ns
fCLK
Clock frequency
30
MHz
(1)
10
Cascade operation
If the devices are connected in cascade and tr or tf is large, it may be critical to achieve the timing required for data transfer between two
cascaded devices.
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Switching Characteristics
VDD = 5.5 V, TJ = –40°C to 125°C (unless otherwise noted)
MIN
TYP
MAX
tPLH1
Low-to-high propagation delay time, CLK to OUTn
PARAMETER
TEST CONDITIONS
27
65
95
ns
tPLH2
Low-to-high propagation delay time, LE(ED1) to OUTn
27
65
95
ns
tPLH3
Low-to-high propagation delay time, OE(ED2) to OUTn
27
65
95
ns
tPLH4
Low-to-high propagation delay time, CLK to SDO
20
30
ns
tPHL1
High-to-low propagation delay time, CLK to OUTn
180
300
445
ns
tPHL2
High-to-low propagation delay time, LE(ED1) to OUTn
180
300
445
ns
tPHL3
High-to-low propagation delay time, OE(ED2) to OUTn
180
300
445
ns
tPHL4
High-to-low propagation delay time, CLK to SDO
20
30
ns
tw(CLK)
Pulse duration, CLK
tw(L)
Pulse duration LE(ED1)
tw(OE)
Pulse duration, OE(ED2)
tw(ED2)
Pulse duration, OE(ED2) in Error Detection mode
th(ED1,ED2)
Hold time, LE(ED1), and OE(ED2)
th(D)
Hold time, SDI
VIH = VDD, VIL = GND,
Rext = 360 Ω, VL = 4 V,
RL = 44 Ω, CL = 70 pF,
CG = 0.992
tsu(D,ED1,ED2) Setup time, SDI, LE(ED1), and OE(ED2)
20
ns
20
ns
1000
ns
2
µs
10
ns
3
ns
4
ns
ns
th(L)
Hold time, LE(ED1), Normal mode
15
tsu(L)
Setup time, LE(ED1), Normal mode
15
tr
Rise time, CLK (1)
(1)
UNIT
ns
500
ns
tf
Fall time, CLK
500
ns
tor
Rise time, outputs (off)
245
ns
tof
Rise time, outputs (on)
570
ns
fCLK
Clock frequency
30
MHz
(1)
Cascade operation
If the devices are connected in cascade and tr or tf is large, it may be critical to achieve the timing required for data transfer between two
cascaded devices.
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PARAMETER MEASUREMENT INFORMATION
IDD
VDD
OE(ED2)
IIH, IIL
IOUT
OUT0
CLK
LE(ED1)
OUT15
SDI
VIH, VIL
R-EXT
GND
SDO
Iref
Figure 6. Test Circuit for Electrical Characteristics
IDD
IOUT
VDD
VIH, VIL
OE(ED2)
CLK
LE(ED1)
Function
Generator
OUT0
OUT15
RL
CL
SDI
Logic input
waveform
VIH = VDD
VIL = 0V
R-EXT
Iref
GND
SDO
CL
VL
Figure 7. Test Circuit for Switching Characteristics
12
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PARAMETER MEASUREMENT INFORMATION (continued)
tw(CLK)
CLK
50%
tsu(D)
SDI
50%
50%
th(D)
50%
50%
tPLH4, tPHL4
50%
SDO
tw(L)
50%
LE(ED1)
tsu(L)
th(L)
OE Low
OE(ED2)
LOW
tPLH2, tPHL2
Output off
OUTn
50%
Output on
tPLH1, tPHL1
tw(OE)
HIGH
50%
OE Pulsed
OE(ED2)
50%
tPLH3
tPHL3
Output off
90%
OUTn
90%
50%
50%
10%
10%
tof
tor
Figure 8. Normal Mode Timing Waveforms
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PARAMETER MEASUREMENT INFORMATION (continued)
tw(CLK)
50%
CLK
tsu(ED2)
OE(ED2)
th(ED2)
50%
tsu(ED1)
LE(ED1)
th(ED1)
50%
2 CLK
Figure 9. Switching to Special Mode Timing Waveforms
CLK
OE(ED2)
50%
50%
tw(ED2)
Figure 10. Reading Error Status Code Timing Waveforms
14
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APPLICATION INFORMATION
Operating Principles
Constant Current
In LED display applications, TLC5926/TLC5927 provides nearly no current variations from channel to channel
and from IC to IC. While IOUT ≤ 50 mA, the maximum current skew between channels is less than ±6% and
between ICs is less than ±6%.
Adjusting Output Current
TLC5926/TLC5927 scales up the reference current, Iref, set by the external resistor Rext to sink a current, Iout, at
each output port. Users can follow the below formulas to calculate the target output current IOUT,target in the
saturation region:
VR-EXT = 1.26 V × VG
Iref = VR-EXT/Rext, if another end of the external resistor Rext is connected to ground.
IOUT,target = Iref × 15 × 3CM – 1
Where Rext is the resistance of the external resistor connected to the R-EXT terminal, and VR-EXT is the voltage of
R-EXT, which is controlled by the programmable voltage gain (VG), which is defined by the Configuration Code.
The Current Multiplier (CM) determines that the ratio IOUT,target/Iref is 15 or 5. After power on, the default value of
VG is 127/128 = 0.992, and the default value of CM is 1, so that the ratio IOUT,target/Iref = 15. Based on the default
VG and CM.
VR-EXT = 1.26 V × 127/128 = 1.25 V
IOUT,target = (1.25 V/Rext) × 15
Therefore, the default current is approximately 52 mA at 360 Ω and 26 mA at 720 Ω. The default relationship
after power on between IOUT,target and Rext is shown in Figure 11.
140
IOUT – mA
120
100
80
40
0
0
500
1000 1500 2000 2500 3000 3500 4000
Rext – W
Figure 11. Default Relationship Curve Between IOUT,target and Rext
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Operation Phases
Operation Mode Switching
In order to switch between its two modes, TLC5926/TLC5927 monitors the signal OE(ED2). When a
one-clock-wide pulse of OE(ED2) appears, TLC5926/TLC5927 enters the two-clock-period transition phase, the
Mode Switching phase. After power on, the default operation mode is the Normal Mode (see Figure 12).
Switching to Special Mode
1
2
3
Switching to Normal Mode
4
5
1
CLK
2
3
4
5
CLK
OE(ED2)
1
0
1
1
1
OE(ED2)
1
0
1
1
1
LE(ED1)
0
0
0
1
0
LE(ED1)
0
0
0
0
0
Actual Mode
Phase (Normal or Special)
Mode
Switching
Special
Mode
Actual Mode
Phase (Normal or Special)
Mode
Switching
Normal
Mode
Figure 12. Mode Switching
As shown in Figure 12, once a one-clock-wide short pulse (101) of OE(ED2) appears, TLC5926/TLC5927 enters
the Mode Switching phase. At the fourth rising edge of CLK, if LE(ED1) is sampled as voltage high,
TLC5926/TLC5927 switches to Special mode; otherwise, it switches to Normal mode.The signal LE(ED1)
between the third and the fifth rising edges of CLK cannot latch any data. Its level is used only to determine into
which mode to switch. However, the short pulse of OE(ED2) can still enable the output ports. During mode
switching, the serial data can still be transferred through SDI and shifted out from SDO.
NOTES:
1. The signal sequence for the mode switching may be used frequently to ensure that the TLC5926/TLC5927 is
in the proper mode.
2. The 1 and 0 on the LE(ED1) signal are sampled at the rising edge of CLK. The X means its level does not
affect the result of mode switching mechanism.
3. After power on, the default operation mode is Normal mode.
Normal Mode Phase
Serial data is transferred into TLC5926/TLC5927 via SDI, shifted in the Shift Register, and output via SDO.
LE(ED1) can latch the serial data in the Shift Register to the Output Latch. OE(ED2) enables the output drivers to
sink current. These functions differ only as described in Operation Mode Switching, in which case, a short pulse
triggers TLC5926/TLC5927 to switch the operation mode. However, as long as LE(ED1) is high in the Mode
Switching phase, TLC5926/TLC5927 remains in the Normal mode, as if no mode switching occurred.
Special Mode Phase
In the Special mode, as long as OE(ED2) is not low, the serial data is shifted to the Shift Register via SDI and
shifted out via SDO, as in the Normal mode. However, there are two differences between the Special Mode and
the Normal Mode, as shown in the following sections.
16
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Reading Error Status Code in Special Mode
When OE(ED2) is pulled low while in Special mode, error detection and load error status codes are loaded into
the Shift Register, in addition to enabling output ports to sink current. Figure 13 shows the timing sequence for
error detection. The 0 and 1 signal levels are sampled at the rising edge of each CLK. At least three zeros must
be sampled at the voltage low signal OE(ED2). Immediately after the second 0 is sampled, the data input source
of the Shift Register changes to the 16-bit parallel Error Status Code register, instead of from the serial data on
SDI. Normally, the error status codes are generated at least 2 µs after the falling edge of OE(ED2). The
occurrence of the third or later 0 saves the detected error status codes into the Shift Register. Therefore, when
OE(ED2) is low, the serial data cannot be shifted into TLC5926/TLC5927 via SDI. When OE(ED2) is pulled high,
the data input source of the Shift Register is changed back to SDI. At the same time, the output ports are
disabled and the error detection is completed. Then, the error status codes saved in the Shift Register can be
shifted out via SDO bit-by-bit along with CLK, as well as the new serial data can be shifted into
TLC5926/TLC5927 via SDI.
While in Special mode, the TLC5926/TLC5927 cannot simultaneously transfer serial data and detect LED load
error status.
1
2
3
CLK
>2 µs
OE(ED2)
1
0
0
0
0
0
1
1
1
1
LE(ED1)
0
0
0
0
0
0
0
0
0
0
SDO
Error Status Code
Bit 15 Bit 14 Bit 13 Bit 12
Data source of
shift register
Error Detection
SDI
SDI
Figure 13. Reading Error Status Code
Writing Configuration Code in Special Mode
When in Special mode, the active high signal LE(ED1) latches the serial data in the Shift Register to the
Configuration Latch, instead of the Output Latch. The latched serial data is used as the Configuration Code.
The code is stored until power off or the Configuration Latch is rewritten. As shown in Figure 14, the timing for
writing the Configuration Code is the same as the timing in the Normal Mode to latching output channel data.
Both the Configuration Code and Error Status Code are transferred in the common 16-bit Shift Register. Users
must pay attention to the sequence of error detection and current adjustment to avoid the Configuration Code
being overwritten by Error Status Code.
0
1
2
3
4
12
13
14
15
Bit 3
Bit 2
Bit 1
Bit 0
CLK
OE(ED2)
1
LE(ED1)
0
SDI
Bit 15 Bit 14 Bit 13 Bit 12
16-Bit Configuration Code
Figure 14. Writing Configuration Code
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Open-Circuit Detection Principle
The LED Open-Circuit Detection compares the effective current level IOUT with the open load detection threshold
current IOUT,Th. If IOUT is below the IOUT,Th threshold, the TLC5926/TLC5927 detects an open-load condition. This
error status can be read as an error status code in the Special mode. For open-circuit error detection, a channel
must be on.
Table 1. Open-Circuit Detection
STATE OF OUTPUT PORT
CONDITION OF
OUTPUT CURRENT
ERROR STATUS CODE
MEANING
IOUT = 0 mA
0
Detection not possible
IOUT < IOUT,Th (1)
0
Open circuit
Channel n error status bit 1
Normal
Off
On
(1)
IOUT ≥ IOUT,Th
(1)
IOUT,Th = 0.5 × IOUT,target (typical)
Short-Circuit Detection Principle (TLC5927 Only)
The LED short-circuit detection compares the effective voltage level VOUT with the shorted-load detection
threshold voltages VOUT,TTh and VOUT,RTh. If VOUT is above the VOUT,TTh threshold, the TLC5927 detects an
shorted-load condition. If the VOUT is below VOUT,RTh threshold, no error is detected and the error bit is reset. This
error status can be read as an error status code in the Special mode. For short-circuit error detection, a channel
must be on.
Table 2. Short-Circuit Detection
STATE OF OUTPUT PORT
CONDITION OF
OUTPUT VOLTAGE
ERROR STATUS CODE
MEANING
Off
On
(1)
IOUT = 0 mA
0
Detection not possible
VOUT < VOUT,TTh (1)
0
Short circuit
VOUT < VOUT,RTh (1)
Channel n error status bit 1
Normal
IOUT,Th = 0.5 × IOUT,target (typical)
Overtemperature Detection and Shutdown
The TLC5926/TLC5927 is equipped with a global overtemperature sensor and 16 individual, channel-specific
overtemperature sensors.
• When the global sensor reaches the trip temperature, all output channels are shutdown, and the error status
is stored in the internal Error Status register of every channel. After shutdown, the channels automatically
restart after cooling down, if the control signal (output latch) remains on. The stored error status is not reset
after cooling down and can be read out as the error status code in the Special mode.
• When one of the channel-specific sensors reaches trip temperature, only the affected output channel is shut
down, and the error status is stored only in the internal Error Status register of the affected channel. After
shutdown, the channel automatically restarts after cooling down, if the control signal (output latch) remains
on. The stored error status is not reset after cooling down and can be read out as error status code in the
Special mode.
For channel-specific overtemperature error detection, a channel must be on.
The error status code is reset when the TLC5926/TLC5927 returns to Normal mode.
18
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Table 3. Overtemperature Detection (1)
STATE OF OUTPUT PORT
(1)
CONDITION
ERROR STATUS CODE
MEANING
Off
IOUT = 0 mA
0
On
On → all channels
Off
Tj < Tj,trip global
1
Normal
Tj > Tj,trip global
All error status bits = 0
Global overtemperature
On
On → Off
Tj < Tj,trip channel n
1
Normal
Tj > Tj,trip channel n
Channel n error status bit = 0
Channel n overtemperature
The global shutdown threshold temperature is approximately 170°C.
16-Bit Configuration Code and Current Gain
Bit definition of the Configuration Code in the Configuration Latch is shown in Table 4.
Table 4. Bit Definition of 8-Bit Configuration Code
Meaning
Default
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8–15
CM
HC
CC0
CC1
CC2
CC3
CC4
CC5
Don't care
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 IOUT,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 × 3CM – 1 = 1.26 V/Rext × VG × 15 × 3CM – 1 = (1.26 V/Rext × 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.
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1.00
CM = 1 (High Current Multiplier)
CM = 0 (Low Current Multiplier)
Current Gain (CG)
0.75
HC = 0 (Low
Voltage SubBand)
0.50
HC = 1 (High
Voltage SubBand)
HC = 0 (Low
Voltage SubBand)
HC = 1 (High
Voltage SubBand)
0.25
{1,1,110000}
{1,1,100000}
{1,1,010000}
{1,1,000000}
{1,0,110000}
{1,0,100000}
{1,0,010000}
{1,0,000000}
{0,1,110000}
{0,1,100000}
{0,1,010000}
{0,1,000000}
{0,0,110000}
{0,0,100000}
{0,0,010000}
{0,0,000000}
0.00
Configuration Code (CM, HC, CC[0:5]) in Binary Format
Figure 15. Current Gain vs Configuration Code
20
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PACKAGE OPTION ADDENDUM
www.ti.com
18-Dec-2008
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
TLC5926IDBQR
ACTIVE
SSOP/
QSOP
DBQ
24
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
TLC5926IDBQRG4
ACTIVE
SSOP/
QSOP
DBQ
24
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
TLC5926IDWR
ACTIVE
SOIC
DW
24
2000 Green (RoHS &
no Sb/Br)
Cu NIPDAU
Level-1-260C-UNLIM
TLC5926IPWPR
ACTIVE
HTSSOP
PWP
24
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
TLC5926IPWPRG4
ACTIVE
HTSSOP
PWP
24
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
TLC5927IDBQR
ACTIVE
SSOP/
QSOP
DBQ
24
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
TLC5927IDBQRG4
ACTIVE
SSOP/
QSOP
DBQ
24
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
TLC5927IDWR
ACTIVE
SOIC
DW
24
2000 Green (RoHS &
no Sb/Br)
Cu NIPDAU
Level-1-260C-UNLIM
TLC5927IPWPR
ACTIVE
HTSSOP
PWP
24
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
TLC5927IPWPRG4
ACTIVE
HTSSOP
PWP
24
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
Lead/Ball Finish
MSL Peak Temp (3)
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
13-Dec-2008
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
TLC5926IDBQR
Package Package Pins
Type Drawing
SSOP/
QSOP
SPQ
Reel
Reel
Diameter Width
(mm) W1 (mm)
A0 (mm)
B0 (mm)
K0 (mm)
P1
(mm)
W
Pin1
(mm) Quadrant
DBQ
24
2500
330.0
16.4
6.5
9.0
2.1
8.0
16.0
Q1
TLC5926IDWR
SOIC
DW
24
2000
330.0
24.4
10.75
15.7
2.7
12.0
24.0
Q1
TLC5926IPWPR
HTSSOP
PWP
24
2000
330.0
16.4
6.95
8.3
1.6
8.0
16.0
Q1
TLC5927IDBQR
SSOP/
QSOP
DBQ
24
2500
330.0
16.4
6.5
9.0
2.1
8.0
16.0
Q1
TLC5927IDWR
SOIC
DW
24
2000
330.0
24.4
10.75
15.7
2.7
12.0
24.0
Q1
TLC5927IPWPR
HTSSOP
PWP
24
2000
330.0
16.4
6.95
8.3
1.6
8.0
16.0
Q1
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
13-Dec-2008
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
TLC5926IDBQR
SSOP/QSOP
DBQ
24
2500
346.0
346.0
33.0
TLC5926IDWR
SOIC
DW
24
2000
346.0
346.0
41.0
TLC5926IPWPR
HTSSOP
PWP
24
2000
346.0
346.0
33.0
TLC5927IDBQR
SSOP/QSOP
DBQ
24
2500
346.0
346.0
33.0
TLC5927IDWR
SOIC
DW
24
2000
346.0
346.0
41.0
TLC5927IPWPR
HTSSOP
PWP
24
2000
346.0
346.0
33.0
Pack Materials-Page 2
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and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should
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Amplifiers
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amplifier.ti.com
dataconverter.ti.com
dsp.ti.com
www.ti.com/clocks
interface.ti.com
logic.ti.com
power.ti.com
microcontroller.ti.com
www.ti-rfid.com
www.ti.com/lprf
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Digital Control
Medical
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Wireless
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www.ti.com/broadband
www.ti.com/digitalcontrol
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www.ti.com/video
www.ti.com/wireless
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