 English |
|
|
|
|
|
|
|
| TLC5946_16 Datasheet, PDF (22/41 Pages) Texas Instruments – 16-Channel, 12-Bit PWM LED Driver with 6-Bit Dot Correction | |||
| |||
| ◁ |
TLC5946
SLVS824B â MARCH 2008 â REVISED JUNE 2008 .......................................................................................................................................................... www.ti.com
SERIAL INTERFACE MODE
The serial interface has two input modes defined by the MODE pin, as Table 3 shows. XLAT must be low when
the MODE pin goes high-to-low or low-to-high to change back and forth between GS mode and DC mode.
MODE
GND
VCC
Table 3. Serial Interface Input Mode
INPUT MODE
Grayscale PWM data
Dot correction data
INPUT SHIFT REGISTER
192 bits
96 bits
SCLK AND GSCLK FREQUENCY
Figure 32 shows a cascading connection of n TLC5946 devices connected to a single controller, building a basic
module of an LED display system. There is no limitation to the maximum number of ICs that can be cascaded.
However, the maximum number of cascading TLC5946 devices depends on the application system and is in the
range of 40 devices. Equation 4 and Equation 5 show the minimum frequencies for GSCLK and SCLK.
f = 4096 f
GSCLK
´ UPDATE
(4)
fSCLK = 192 ´ fUPDATE ´ n
(5)
where:
⢠fGSCLK = minimum frequency of GSCLK
⢠fSCLK = minimum frequency of SCLK
⢠fUPDATE = update rate of entire cascading system
⢠n = number of cascaded TLC5946 devices
VLED
VLED
VCC
¼
¼
VLED
VLED
¼
Controller
OUT
XERR
SCLK
XLAT
MODE
BLANK
GSCLK
IN
RIREF
¼ OUT0
OUT15
SIN
SOUT
XERR
SCLK
XLAT TLC5946
MODE IC1
VCC
BLANK
VCC
GSCLK
XHALF
IREF
GND
RIREF
¼ OUT0
OUT15
SIN
SOUT
XERR
SCLK
XLAT TLC5946
MODE ICn
VCC
BLANK
VCC
GSCLK
XHALF
IREF
GND
6
Figure 32. Cascading Device Connections
22
Submit Documentation Feedback
Product Folder Link(s): TLC5946
Copyright © 2008, Texas Instruments Incorporated
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese