Rev. 4560C–AUTO–10/03
Two-relay
Flasher
ATA6140
Features
Temperature and Voltage Compensated Frequency (Fully Integrated Oscillator)
Warning Indication of Lamp Failure by Means of Frequency Doubling
Voltage Dependence of the Indicator Lamps also Compensated for Lamp Failure
Relay Output with High Current Capability and Low Saturation Voltage
Frequency Doubling only During Direction Mode
Temperature Compensated Threshold for Lamp Failure Detection
Overvoltage and Undervoltage Shut Down of the Relay Outputs
Quiescent Current I ≤ 10 µA (Switches Open)
EMI Protection According to ISO TR 7637/1, Test Level 4 (Exclusive Load Dump)
Reversed Battery Protection by Means of a Serial Resistor and Relay Coil Connected
Load Dump Protection 80 V with External Protection Components
12 V/24 V Application
Package: SO16
Electrostatic sensitive device.
Observe precautions for handling.
Description
The integrated circuit ATA6140 is used in relay-controlled automotive flashers. With
two output stages, each side of the vehicle is controlled separately. A left and a right
direction indicator input with only a small control current makes switch contacts for
small loads possible. The separate hazard warning input simplifies the construction of
the hazard switch. Lamp outage is indicated by frequency doubling during direction
mode. Thanks to the extreme low current consumption the ATA6140 can be connected
to the battery directly.
Figure 1. Block Diagram
Measure input
Batt
Battery sense
Ign
Output left
Output right
IC-Ground
LED
24V
Test pin
Integrated
oscillator
POR
Logic
Power on and
5 V regulator
Current monitoring
and short circuit
protection
Charge
pump
Output
stages
Over-, undervoltage
and load dump
detection
Debounce
Debounce
Bias
current
Input
Comp
Comp
TS1B
TS2B
TS1G
TS2G
Haz
DebounceInput
DebounceInput
Debounce
Input
DebounceInput
LED