MAX16810 Maxim Integrated Products, MAX16810 Datasheet - Page 17

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

Figure 3. 4-Wire Serial-Interface Timing Diagram
Figure 4. LE and CLK to OUT_ _ Timing
OUT_ _
OUT_ _
LE
LE
CLK
OUT_ _
CLK
OUT_ _
OUT_ _
DOUT
Switch-Mode Boost and SEPIC Controller
CLK
DIN
OE
LE
______________________________________________________________________________________
Integrated 16-Channel LED Drivers with
t
t
LRF
t
LRR
CRF
t
CRR
t
DS
D15
t
DH
t
CL
t
OEF
D14
t
f
t
t
CH
OEW
80%
20%
The MAX16810 includes a watchdog circuit that moni-
tors the CLK, DIN, and LE inputs. If there is no transi-
tion on any one of these inputs for nominally 1s, the
output latches are cleared and outputs OUT0–OUT15
go high impedance like the initial power-up condition.
This turns off all LEDs connected to the outputs. The
shift-register data does not change, just the output-
latch data. When the watchdog triggers, the outputs
remain off until the driver output latches are updated
with data turning them on. Recovery is therefore auto-
matic if the transmission failure is temporary because
the MAX16810 does not lock up in the watchdog timeout
state. The MAX16810 operates correctly when the serial
interface is next activated, and the watchdog circuit is
reset and starts monitoring the serial interface again. The
watchdog function requires no software change to the
application driving the MAX16810. The rise time for CLK,
DIN, and LE should be less than 10µs.
t
OER
D1
t
r
t
DO
t
CP
D0
t
LS
D15
t
LW
Watchdog (MAX16810)
17