TB62719AF
TOSHIBA Bi-CMOS Integrated Circuit Silicon Monolithic
TB62719AF
16ch constant current drivers and controller for full-color LED modules and panels
The TB62719AF is an LED driver which is suitable for driving
full-color LED modules.
This device has built-in 8-bit PWM grayscale and each output
current adjustment functions. It can turn on to 16 LEDs.
This device has a heat sink fitting side on the surface of the
package.
Then, a heat sink will dissipate heat generated in the device.
In addition, this device built-in TSD (Thermal Shut Down) and
output-open detection functions to protect the device.
Features
•
•
•
•
Output current capability and number of outputs: 90 mA × 16
outputs
Recommended constant current range: 2.5 to 75 mA
Application output voltage: 0.7 V (I
OUT
= 2.5 to 90 mA)
0.4 V (I
OUT
= 2.5 to 40 mA)
Weight: 0.26 g (typ.)
Adjustment function
1. Standard current adjustment (8-bit serial data input)
This function supports standard current adjustment using an external resistance connected to the REXT pin.
2 high-order bits: Output current can be adjusted to any one of 4 levels in the range 25 to 100%.
6 low-order bits: Output current can be adjusted to any one of 64 levels in the range 40 to 100%.
2. Each dot adjustment (128-bit serial data input)
This function allows adjustment of the current value for each output (dot).
: Output current can be adjusted to any one of 64 levels in the range 20 to 100%.
3. All dot adjustment 1 (8-bit parallel data input)
This function allows adjustment of brightness for each LED module.
5 low-order bits: Output current can be adjusted to any one of 32 levels in the range 50 to 100%.
4. All dot adjustment 2 (8-bit parallel data input)
This function allows changes to the frequency of the PWM clock and allows major brightness adjustment for
the display.
3 high-order bits: PWM clock frequency can be adjusted to any one of 8 levels in the range 1/1 to 1/8.
5. 256-grayscale PWM function (8-bit parallel data input)
This function controls the pulse width for each output, yielding 256 grayscales.
Maximum PWM clock frequency 10 MHz (for all temperature range), Minimum pulse width 2 µs.
•
•
Accuracy of bits in constant-current output levels prior to adjustment
±6.0%
max (for output current of 5 mA to 75 mA)
Protection functions
1. Thermal shutdown function (TSD)
This function monitors the rise in junction temperature.
Connect a pull-up resistor to the ALARM1 pin in order to monitor the temperature.
Step 1 When junction temperature is 120° or more: Error signal is driven out from the ALARM1 pin.
Step 2 When junction temperature is 140° or more: Error signal is driven out from the ALARM1 pin
and all outputs are turned off.
2. Output Open Detection (OOD)
This function operates when an output pin is open.
Connect a pull-up resistor to the ALARM2 pin in order to monitor this.
•
For anode-common LEDs
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TB62719AF
•
•
•
•
•
•
•
Input signal voltage level: CMOS level (schmitt trigger input)
Power supply voltage range: V
DD
= 4.5 V to 5.5 V
Maximum output pin voltage: 26 V
Serial and parallel data transfer rate: 20 MHz (max, cascade connection)
Operating temperature range: T
opr
=
−40
to 85°C
Package: HQFP64-P-1010-0.50. A Heat sink can be fitted
Existing product: The same pin assignment and function as TB62718AF
Warnings
Short-circuiting an output pin to GND or to the power supply pin may destroy the device. Take care when wiring
the output pins, the power supply pin and the GND pins (V
SS
, V
SS2
).
Do not apply either positive or negative voltages to the heat sink on the surface of the IC.
In addition, do not solder anything to the heat sink.
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TB62719AF
Pin Assignment
(top view)
and Markings
48
DOE
SI DATA
SI CLK
SI LATCH
SI SEL
PWMCLK
BCEN
DCEN
RESET
PI SEL
PI LATCH
PI CLK
VSS
PI DATA 0
PI DATA 1
PI DATA 2
PI DATA 3
PI DATA 4
PI DATA 5
PI DATA 6
PI DATA 7
VDD
NC
VSS2
OUT 00
33
TB62719AF
32
OUT 01
OUT 02
OUT 03
OUT 04
OUT 05
OUT 06
OUT 07
VSS2
VSS2
OUT 08
OUT 09
OUT 10
OUT 11
OUT 12
OUT 13
OUT 14
49
LED TEST
BLANK
REXT
VSS
SO DATA
TSENA
TEST0
64
1
4WWKA**
16
17
Note: Indicates device name on the upper surface of the package.
Indicates weekly code on the lower surface of the package.
Details of weekly code on lower surface:
From left,
st
1 character
=
rightmost digit of year
3 for 2003, 4 for 2004
nd
rd
2 and 3 characters
=
week of manufacture during year: maximum value
=
52.
th
4 characters
=
manufacturing factory (‘K’ means the Kita Kyushu factory.)
th
th
5 to 7 characters
=
lot number within week
1 lot is A11, 2 lot is A1 and 3 lot is A.
th
th
th
4 lot is B11, 5 lot is B1 and 6 lot is B.
th
th
th
64 lot is Z11, 65 lot is Z1 and 66 lot is Z.
The four characters of ‘I’, ‘M’, ‘O’ and ‘W’ are not used.
st
nd
rd
TEST1
ALARM1
ALARM2
VSS
PO DATA 0
PO DATA 1
PO DATA 2
PO DATA 3
PO DATA 4
PO DATA 5
PO DATA 6
PO DATA 7
VDD
NC
VSS2
OUT 15
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TB62719AF
Block Diagram
(entire device)
PI SEL
PI DATA
[0 to 7]
8
3-bit
Clock counter
SI CLK
SI REG2
PI REG1
All dot adjustment
data register &
latch
(1
×
8 bits)
PI REG2
PWM
data register
& latch
(16
×
8 bits)
8
8-bit clock
counter
Each dot
adjustment data
register
& latch
(1
×
128 bits)
SI REG1
Standard
current
adjustment data
register & latch
(1
×
8 bits)
PWMCLK
SI DATA
SI SEL
8
PI CLK
8
3
BCEN
PI LATCH
DCEN
8
SI LATCH
8
8
5
8
PWM pulse
generator circuit
(8 bits)
SO DATA
128
DOE
PO DATA
[0 to 7]
OUT [00 to 15]
BLANK&
LED TEST
ALARM2
8
16
16
×
6 bit DACs and
16 constant-current outputs
Output-open
detection circuit
DAC4
DAC3
V/I conversion
circuit
1
×
5-bit
DAC
DAC1
1
×
2-bit
DAC
DAC2
1
×
6-bit
DAC
REXT
TSD2 circuit
ALARM1
TSD1 circuit
TSENA
For PI REG1, PI REG2,
SI REG1 and SI REG2
RESET
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TB62719AF
Constant Current Adjustment Range
(graph)
This Graph Shows How Current May Be Adjusted to a Fraction of Its Full-Scale Value.
Note: In each case, the value input to each DAC is the value output from the previous DAC.
Reference: Current adjustment functions
DAC1 to DAC3 are the current adjustment functions for all outputs.
The adjustment width of DAC1 is large and approximate (1LSB
∼
25%).
−
The adjustment width of DAC2 is the smallest and has a large error (1LSB
∼
0.95%).
−
The adjustment width of DAC3 is small. DAC3 is a high-performance DAC with a small error
(1LSB
∼
1.61%).
−
Therefore,
It is recommended that DAC1 and DAC2 be used for adjusting the REXT resistance.
It is recommended that DAC3 be used for adjusting brightness between module.
(after it was set and it had DAC4 adjusted to the dot.)
The beginning is set in about 75% of the middle value, after that it is effective to use
±25%
of set width.
DAC4 is the current adjustment function for each outputs.
The adjustment width of DAC4 is small. But it is a high-performance DAC with a small error
(1LSB
∼
1.27%).
−
And also, DAC4 has a very wide setting range.
Therefore, DAC4 can be used to adjust the brightness of LEDs without a rank classification.
This method allows brightness to be adjusted with a degree of accuracy of 1.27% of full scale.
Note: Assuming precise linear correlation between output current and LED brightness
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