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16-Port, 36V Constant-Current LED Driver with
LED Fault Detection and Watchdog
LE
t LW
t CL
t CH
t CP
t LS
CLK
t DH
t DS
DIN
D15
D14
D1
D0
t DO
DOUT
OE
t OEL
t OEW
t OEH
D15
90%
.
OUT_
t f
Figure 2. 4-Wire Serial-Interface Timing Diagram
Detailed Description
The MAX6983 LED driver comprises a 4-wire serial
interface driving 16 constant-current sinking open-drain
output ports. The outputs drive LEDs in either static or
multiplex applications (Figure 1). The constant- current
outputs are guaranteed for current accuracy not only
with chip-supply voltage variations (5V ±10% and 3V to
5.5V), but also over a realistic range of driver output
voltage drop (0.8V to 2.5V). The drivers use current-
sensing feedback circuitry (not simple current mirrors)
to ensure very small current variations over the full
allowed range of output voltage (see the Typical
Operating Characteristics ).
The 4-wire serial interface comprises a 16-bit shift reg-
ister and a 16-bit transparent latch. The shift register is
written through a clock input CLK and a data input DIN
and the data propagates to a data output DOUT. The
data output allows multiple drivers to be cascaded and
operated together. The contents of the 16-bit shift reg-
ister are loaded into the transparent latch through a
latch-enable input LE. The latch is transparent to the
shift register outputs when high, and latches the cur-
rent state on the falling edge of LE.
Each driver output is an open-drain, constant-current
sink that should be connected to the cathode of either
10%
t r
a single LED or a series string of multiple LEDs. The
LED anode can be connected to a supply voltage of up
to 36V, independent of the MAX6983 supply, V+. The
constant-current capability is up to 55mA per output,
set for all 16 outputs by an external resistor, R SET .
4-Wire Serial Interface
The serial interface on the MAX6983 is a 4-wire serial
interface using four inputs (DIN, CLK, LE, and OE ) and
a data output (DOUT). This interface is used to write
display data to the MAX6983. The serial-interface data
word length is 16 bits, D0–D15. See Figure 2.
The functions of the five interface pins are as follows.
DIN is the serial-data input, and must be stable when it
is sampled on the rising edge of CLK. Data is shifted
in, MSB first. This means that data bit D15 is clocked in
first, followed by 15 more data bits, finishing with the
LSB D0.
CLK is the serial-clock input, which shifts data at DIN
into the MAX6983 16-bit shift register on its rising edge.
LE is the latch load input of the MAX6983, which trans-
fers data from the MAX6983 16-bit shift register to its 16-
bit latch when LE is high (transparent latch), and latches
the data on the falling edge of LE (Figure 2).
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