MAX14912 Datasheet, PDF (19/30 Pages) Maxim Integrated Products – Low Power and Heat Dissipation

MAX14912/MAX14913
Octal High-Speed, High-Side
Switch/Push-Pull Driver
Undervoltage Lockout
When the V_L, V_DD, or V₅ supply voltages are under their
respective UVLO thresholds, all OUT_ outputs are turned
off (three-stated) and the open-load detect current sourc-
es are turned off; they automatically turn back on once the
V_DD/V₅ rises to above the UVLO thresholds.
Undervoltage conditions can be read out through SPI.
The UVLO open-drain output pin indicates whether V_DD
is below the V_{DD_UV} threshold.
LED Drivers
The 4 x 4 LED driver crossbar matrix offers a pin-optimized
configuration for driving 16 LEDs. Per-channel output
status and the fault conditions are indicated by individual
LEDs. If a FAULT LED is turned on for an output, the
corresponding LEVEL LED is always turned off. This
mitigates false information about the status of the affected
OUT_ pin.
For every current-limiting resistor (R), each of the four
LEDs in the vertical string are pulsed so that current only
flows through one LED at any given time. Therefore, the
resistors (R) determine the LED current through one LED
and should be chosen according to the LED’s current/light-
intensity requirements. Every LED that is on, is pulsed on
with a 25% duty cycle.
Configuration and Monitoring
The MAX14912/MAX14913 can be configured, set, and
monitored through either a parallel or serial interface. The
serial interface allows greater configuration flexibility and
provides more monitoring information. For the MAX14913, in
parallel setting mode (SRIAL = low), the SPI cannot be used
for configuring the device, SPI is only available for monitoring.
Global Configuration
Pin-based configuration does not require the use of the
SPI interface. It is global and allows for the configuration
of all OUT_ as high-side outputs, push-pull outputs, and
enables open-load detection. See Table 1 for details.
In cases where configuration is possible through the
parallel and/or serial interface, Table 2 documents the
priority.
MAX14912
5V
MAX14913
LEDH15
LEDH26
LEDH37
LEDH48
R
R
R
R
LDLF1-4
FAULT 1 - 4
LDLF 5-8
LDLS1-4
LDLS5-8
GND
FAULT 5 - 8
STATUS1 - 4
STATUS 5 - 8
Figure 6. LED Output Status and Fault-Detection Matrix
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