ATA6140 Datasheet, PDF (1/13 Pages) ATMEL Corporation – TWO RELAY FLASHER

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.
Two-relay
Flasher
ATA6140
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
24V
Haz
TS1G
Integrated
oscillator
Comp
Power on and
5 V regulator
Bias
current
POR
Input Debounce
Input Debounce
Current monitoring
and short circuit
protection
Debounce
Charge
pump
Output
stages
Measure input
Battery sense
Batt
Ign
Output left
TS1B
TS2G
TS2B
Input Debounce
Input _Debounce
Input
Debounce
Comp
Logic
Over-, undervoltage
and load dump
detection
Output right
IC-Ground
Test pin
LED LED
Rev. 4560C–AUTO–10/03