ATA2069 Datasheet, PDF (1/7 Pages) ATMEL Corporation – Flasher with Trailer Control

Features
• Lamp Outage Indication for Car and Trailer
• Temperature and Supply Voltage Compensated Flashing Frequency
• Relay Driver Output with High Current Carrying Capacity and Low Saturation Voltage
• Minimum Lamp Load for Flasher Operation > 10W
1. Description
The bipolar integrated circuit ATA2069 is designed for the use in relay-operated auto-
motive flasher modules and makes it possible to detect the outage of flasher bulbs on
the vehicle itself and also on a trailer.
Vehicles with a trailer hook are equipped with additional pilot lamps in the dashboard.
ATA2069 is off (i.e., the relay is deactivated) as long as the flasher switch (at contact
+49a) is open. As soon as this switch is closed, the IC starts reliably with the bright
phase.
There are two thresholds integrated: one threshold is defined to be 21 + 10W and is
designed for the lamp outage detection of 1 of 2 lamps. If the current is below this
threshold, the IC switches to frequency doubling, just like the standard flashers (e.g.
U2043B).
The other threshold is defined to be 42 + 10W and is designed for the outage detec-
tion of 1 of 3 lamps; if this happens, the additional trailer pilot lamp is switched off, but
there is no frequency doubling. 50 ms after the start of the bright phase, the compara-
tor measures the voltage drop at the shunt and latches this value for the rest of the
bright phase. The output of this pilot lamp (pin 8) is short-circuit protected against
GND. In case of a short circuit the external transistor is switched off after 52 ms for the
rest of the current flasher cycle, but it is enabled again for the next cycle.
Flasher with
Trailer Control
ATA2069
Rev. 4917B–AUTO–03/06