Triple 60mA Linear LED Controller
Preliminary Information - Jan 21, 2015
E522.84/85/86/87
5.7.4 Automotive Cluster Application
RUN
VS
LED1
LED2
LED3
IR
GND
ENA
E522.84
E522.84
RUN
VS
LED1
LED2
LED3
IR
GND
ENA
Figure 10. Automotive Cluster Application
The application shows additional elements, that are typically useful for an automotive environment. Further elements may be
necessary (e.g. input protection or suppressor diodes as required).
Features of this setup are:
Digital dimming via battery line, e.g. from control modules highside driver
RUN diode-Or bus for failure indication, making use of central bus pullup resistor to VS (If the bus has no further
connections than E522.8x ICs, it can be omitted. Just leave pins RUN open in this case)
RUN bus configured as drawn: Only strings of a single IC will switch ‘off’ in case of a diagnostic event. If the diode is
replaced by a direct connection, the complete cluster can be switched ‘off’. The central pullup is not necessary in this case
(hint: ENA ‘low’ leads to active low RUN)
The lower IC in „Figure 10. Automotive Cluster Application“ uses balancing resistors to equally share its current between
Channel 1 and 3, thus less than three channels are possible with one IC. Alternatively, see Elmos datasheet E522.80 for a
compatible IC with more sophisticated options to disable channels
Various protective devices added for automotive environment, like e.g. damping R-C network for inductive supply line
Topology can be extended by further devices of the E522.8x family to build larger clusters
This document contains information on a pre-production product. Elmos Semiconductor AG reserves the right to change specifications and information herein without notice.
Elmos Semiconductor AG
Data Sheet
QM-No.: 25DS0137E.00
16/20
ELMOS [ ELMOS SEMICONDUCTOR AG ]
