The U2044B is an integrated circuit used in relay-controlled automotive flashers. With two output stages, each side of the vehicle is controlled separately. It has a left and a right direction indicator input with only a small control current, making 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 U2044B can be connected to the battery directly.
The Atmel U2044B is an integrated circuit designed for use in relay-controlled automotive flashers. It features two separate output stages to control each side of a vehicle's direction indicators independently, utilizing small control currents to switch contacts for small loads.
Key features include temperature and supply voltage compensated flashing frequency, lamp outage indication via frequency doubling, and high current-carrying capacity with low saturation voltage. The device supports three control inputs: left, right, and hazard warning, and offers protection against EMI and reverse polarity.
| Supply voltage range | 8 to 18 V |
|---|---|
| Output current for relay driver | 300 mA |
| Minimum lamp load | 1 W |
| Supply current (switches open) | < 10 uA |
| Junction temperature | 150 °C |
The minimum lamp load required for the U2044B to operate as a flasher is 1 W.
Lamp outage is indicated by frequency doubling during direction mode.