MAX16810 Maxim Integrated Products, MAX16810 Datasheet - Page 16

• Manufacturer Part Number: MAX16810
• Description: (MAX16809 / MAX16810) Integrated 16-Channel LED Drivers
• Manufacturer: Maxim Integrated Products

Table 1. 4-Wire Serial-Interface Truth Table
Integrated 16-Channel LED Drivers with
Switch-Mode Boost and SEPIC Controller
The MAX16809/MAX16810 also operate in a stand-
alone mode (see the Typical Operating Circuits ). For
use with a microcontroller, the MAX16809/MAX16810
feature a 4-wire serial interface using DIN, CLK, LE, OE
inputs and DOUT as a data output. This interface is
used to write the LED channels’ data to the MAX16809/
MAX16810. The serial-interface data word length is 16
bits, D0–D15. See Figure 3.
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.
L = Low Logic Level
H = High Logic Level
X = Don’t Care
P = Present State (Shift Register)
R = Previous State (Latched)
16
SERIAL
INPUT
DATA
DIN
H
L
X
______________________________________________________________________________________
CLOCK
INPUT
CLK
SHIFT REGISTER CONTENTS
D0 D1 D2 … Dn-1
R0 R1 R2 … Rn-1
P0
H
X
L
R0 R1 … Rn-2 Rn-1
R0 R1 … Rn-2 Rn-1
P1 P2 … Pn-1
X
X
…
X
4-Wire Interface
LED Driver
Dn
Rn
Pn
X
INPUT
LOAD
LE
H
L
D0 D1 D2 … Dn-1 Dn
R0 R1 R2
P0 P1 P2
X
LATCH CONTENTS
X
CLK is the serial-clock input that shifts data at DIN into
the MAX16809/MAX16810’s 16-bit shift register on its
rising edge.
LE is the latch-enable input of the MAX16809/MAX16810
that transfers data from the 16-bit shift register to its 16-
bit output latches (transparent latch). The data latches
on the falling edge of LE (Figure 4). The fourth input (OE)
provides output-enable control of the output drivers.
When OE is driven high, the outputs (OUT0–OUT15) are
forced to high impedance without altering the contents of
the output latches. Driving OE low enables the outputs to
follow the state of the output latches. OE is independent
of the serial interface operation. Data can be shifted into
the serial-interface shift register and latched, regardless
of the state of OE. DOUT is the serial-data output that
shifts data out from the MAX16809/MAX16810’s 16-bit
shift register on the rising edge of CLK. Data at DIN
propagates through the shift register and appears at
DOUT 16 clock cycles later. Table 1 shows the 4-wire
serial-interface truth table.
X
… Rn-1 Rn
… Pn-1 Pn
…
X
X
BLANKING
INPUT
OE
H
L
D0 D1 D2 …
P0 P1 P2
L
CURRENT AT OUT_ _
OUTPUT CONTENTS
L
L
…
…
Dn-1 Dn
Pn-1 Pn
L
L