Texas Instruments TLC5944EVM-358, Руководство пользователя, Страница: 3 / 33

1.1.4 Printed-Circuit Board Assemblies
TUSB3410 TRS3221
TRS3221
F2808
TLC5944
USB
DSP Board (TMS320F2808)
LED Driver Board (HPA358)
LED Board
(LEDEVM-357)
8
16
16
16
GPIOs
UART
RS - 232
UART
Host Computer
TLC5944
TLC5944
1.2 Related Documentation From Texas Instruments
2 Setup
www.ti.com
Setup
The TLC5944EVM-358 EVM kit contains three printed-circuit boards: HPA358 (Driver board), HPA357
(LED board), and TMDSCNCD2808 (DSP board).
Driver Board: The Driver board contains the TLC5944 ICs and their required external components. This
board contains several jumpers and connectors that enable you to customize the board for specific
operating conditions. This board interfaces directly to the host computer via a USB connector. The EVM
GUI software communicates with the Driver board through a TUSB3410. The TUSB3410 communicates
with the DSP board with an RS-232 protocol. The Driver board contains resistors R16-R27 that set a
binary code to tell the DSP what EVM is connected. It contains all power supply circuitry as well as
circuitry containing Q1 and Q2 to enable and disable the ghosting features of the IC. The Driver board is
designed to directly drive the LED board; however, the customer may also remove the LED board to drive
a custom LED board.
LED Board: The LED board contains two rows of LEDs. Row A consists of 16 LEDs, each with three
individual LEDs in the same package: a red, a green, and a blue LED. Row B consists of a 16 LEDs, each
with a single red LED. It also contains the circuitry required to multiplex between Row A and Row B. A
digital signal, ROW_CTRL_0, from the Driver board connects power to Row A when high and connects
power to Row B when low. The orderable Texas Instruments part number for this PCB is LEDEVM-357.
DSP Board: The DSP board contains a TMS320F2808 ('F2808) microcontroller that programs and
controls the three TLC5944 ICs on the Driver board. The 'F2808 DSP decodes the information it receives
from the LED Driver board and converts it into a form required by the TLC5944 ICs. The DSP board’s
orderable part number is TMDSCNCD2808.
Figure 1 shows how these boards are connected.
Figure 1. Board Connections
1. TLC5944, 16-Channel, 12-Bit PWM LED Driver With 6-Bit Dot Correction and Pre-Charge FET data
sheet ( SBVS112 )
2. TLC5944 software ( SLVC186 )
3. TMDSCNCD2808 DSP controlCARD™ documents ( SPRR101 )
This section describes the jumpers and connectors on the EVM as well as how to properly connect, set
up, and use the TLC5944EVM-358.
SLVU306 – April 2009 TLC5944EVM-358 3
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