Texas Instruments TLC59282EVM, Руководство пользователя

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Test Set Up
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5 Test Set Up
5.1 Equipment
5.1.1 Voltage Source
V
CC
supply (TLC59282 Driver): 3–5.5 V at 50 mA.
V
LED
supply: 5 V at more than 16 times the set output current, I
REF
CAUTION
Do not operate without LED loads. The TLC59282 outputs are bipolar and can
draw high I
CC
current when no load is connected.
Connect V
CC
to J6 and V
LED
to J5 as shown in Figure 2 .
5.1.2 Serial Interface
Evaluate this EVM by preparing a signal pattern generator like an FPGA, CPLD, MCU or some equipment
like DG2020 for the input signals. Connector J1 or TP1 to TP4 connect the signals BLANK (pin 7 or TP4),
SIN (pin 10 or TP3), SCLK (pin 9 or TP2), LAT (pin 8 or TP1), and GND (pin 6 or TP10).
5.2 Equipment Setup
Figure 2 shows the basic test set up recommended to evaluate the TLC59282 EVM. Note that although
the return for J5 and J6 are the same system ground, the connections should remain separate as shown
in
Figure 2 .
5.2.1 Procedure
1. Working at an ESD workstation, make sure that any wrist straps, bootstraps, or mats are connected
referencing the user to earth ground before power is applied to the EVM. Wear electrostatic smock and
safety glasses.
2. Before connecting the DC input sources, V
CC
and V
LED
, limit the source currents. Set V
CC
and V
LED
to
0 V, initially, and connect as shown in Figure 2 .
3. Place a jumper on J7 to the desired forward current. R5 personalizes the needed current, according to
Equation 1 in Section 4.2 . Do not use the connection to R5 as long as there is no resistor populated.
4. Connect the DC power supplies, V
CC
and V
LED
, to the EVM as shown in Figure 2 .
5. Connect the pattern generator or MCU to the EVM as shown in Figure 2 .
6. Make sure the pattern generator or MCU is loaded with the EVM control software and the I/O levels
are compatible with the TLC59282 V
CC
supply. Example: if V
CC
= 3.3 V, then interface 3.3-V I/O’s to the
EVM board.
7. Using the timing diagram (Figure 9, TLC59282 ( SBVS152 ) datasheet) as a guide, load the TLC59282
registers and control the outputs as desired.
6 Using the TLC59282, 16-Channel LED Driver SLVU672 – August 2012
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