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PDF TM1829 Data sheet ( Hoja de datos )
| Número de pieza | TM1829 | |
| Descripción | Three-channel constant current LED driver | |
| Fabricantes | Titan Micro Electronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TM1829 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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Translated from: TM1829_V1.4-chin.pdf - by BNT - Date: 07.12.13
Page 01
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Three-channel constant current LED driver TM1829
Characterization
TM1829 is a three-channel LED (light emitting diode) constant current drive control of a
dedicated circuit, the internal MCU integrated single-wire digital interface, data latches
Devices, LED constant current driver circuit, PWM brightness control circuit. Through the
single-wire digital interface chip (DI, DO) cascade, the external controller only
Single line can control the chip and its subsequent cascade chips. Constant luminance value
and the PWM output port can be individually TM1829 by peripheral controller
Setting. VDD pin internal 5V regulator integrated, less peripheral devices. This product is
excellent performance, reliable quality.
Features
Using power CMOS process
OUT 24V output port pressure
Built-in 5V VDD regulator, the series resistor voltage support 6 ~ 24V
Brightness adjustment circuit 256 adjustable brightness
Wire serial cascade interface
Oscillation mode: Built-in RC oscillator and clock synchronization based on the data line
signal, after completion of this unit can receive data automatically after
After regeneration to continue sending data through the data output lower, the signal does not
change with the cascade far and distortion or attenuation
Built-in power-on reset circuit
PWM control side can achieve 256 adjustable scan frequency 7kHz
Constant current regulator can achieve 32 (10mA-41mA)
By receiving and decoding a data signal line is completed
When the refresh rate of 30 frames / s, the number of low-speed mode cascade of not less than
1024 points, the high-speed mode is not less than 2048 points
Data transfer rate up to 800Kbps and 1.6Mbps modes
Transmission distance between any two points less than 30 m
Package: SOP8, DIP8
Internal structure diagram
© Titan Micro Electronics
V1.4
1
www.titanmec.com
Free Datasheet http://www.datasheet-pdf.com/
1 page  
Switching Characteristics
(VDD = 5.0V and under -40° to +85°, VDD =
5.0V typ.
TA = +25°), unless otherwise noted
Max Typical
Min
values
Low-speed fosc1
DIN floating or
mode
connected to GND
High-speed fosc2
DIN tied to VDD
mode
OUT PWM fout
OutR, OutG, OutB
output
frequency
Propagation Tplz
DIN → DOUT
delay time
Tplz CL = 15pF
RL = 10K Ω
Fall Time Tthz
CL = 300pF
OutR / OutG / OutB
Input
Ci
capacitance
Test
Conditions
6.5
© Titan Micro Electronics
V1.4
TM1829
Parameter Parameter Unit
Symbol name
800 KHz
1.6 MHz
7 7.5 KHz
200 ns
100 ns
80 µs
15 pF
4
www.titanmec.com
Translated from: TM1829_V1.4-chin.pdf - by BNT - Date: 07.12.13
Page 05
-------------------------------------------------------
Three-channel constant current LED driver TM1829
Timing Characteristics
Description
The chip uses single-wire communication, using methods NRZ transmission signal. Chip
power-on reset after accepting DIN
End of the data sent, after receiving complete 24bit, DO DIN port starts forwarding client
continues to send data to the next chip to mention cascade
For the input data. Before forwarding the data, DO port has been high. If the DIN input
RESET Reset signal, the chip will reset after a successful root
According to the received data output corresponding 24bit PWM duty cycle waveform, and
the chip re waiting to receive new data, beginning at the receiving end 24bit
After the data, DO port forwarding data through the chip RESET signal is not received before,
OutR, OutG, OutB original pin output remains unchanged.
Automatic plastic transponder chip technology, signal attenuation without distortion, making
the number of the chip unrestricted cascade signal transmission, only
Restricted refresh speed requirements.
A data structure
Constant current mode commands:
After the on-chip power-on reset, the input data for each successive Din 24-bit for a complete
packet, starting high, if high 8 [bit23bit16]
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5 Page 
Software is required in conjunction with control values were written three sets of registers, the
advantage is precisely to get the desired current value and the constant current is large.
TM1829
with a process-driven approach LED
5.1 To achieve chip LED brightness control, first make sure that RGB port voltage, enabling
the chip to enter the constant work (specific reference to "constant Curve ");
5.2-chip power-on reset initializes the first set of constant values and the test mode bit T is 0
(allow PWM outputs), such as setting the output through
RGB channel constant current of 20mA, then the maximum current is allowed to flow through
to 20mA. Current value should be set according to LED;
5.3 pairs of PWM register is written, set the PWM output, as set PWM output channel RGB
luminance level is 100, then flows through the LED
Current is 100 ÷ 256 × 20mA = 7.8mA;
5.4 PWM values constantly changing, we can arbitrarily adjust the brightness of the LED. Set
PWM value is 0, the output full-height, LED off. Set PWM
Value FFH (Note 24BIT not all high 8 1), the largest low duty cycle of the output waveform,
LED brightest.
5.5 If the current value is set and the test mode bit T is 1, then enter the test mode.
Note: To avoid the chip after powering off the controller does not cause initialization set
register values lost constant, constant current
Changes suggested in the course of the PWM register refresh refresh timer constant register or
re-register constant refresh refresh PWM register.
© Titan Micro Electronics
V1.4
10
www.titanmec.com
Translated from: TM1829_V1.4-chin.pdf - by BNT - Date: 07.12.13
Page 11
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Three-channel constant current LED driver TM1829
Constant Curve
The TM1829 is applied to the LED panel design on time, even between ICs minimal between
channels. This stems from the excellent characteristics TM1829
Sex:
When the load terminal voltage changes, the output current is not affected its stability, as
shown below
As shown in Figure, the current Iout voltage Vds output port to the port and the relationship
shows that, when working in a constant state, the port
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11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet TM1829.PDF ] | |
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