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U2044B Datasheet(PDF) 4 Page - ATMEL Corporation |
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U2044B Datasheet(HTML) 4 Page - ATMEL Corporation |
4 / 9 page 4 4721C–AUTO–02/08 U2044B 3. Functional Description 3.1 Oscillator (Pin 1 and 14) Flashing frequency, f 1, is determined by the R1C1 components as follows (see Figure 1-1 on page 2): where C 1 ≤ 47 µF R 1 = 6.8 kΩ to 180 kΩ In the case of a lamp outage, the oscillator frequency is switched to the lamp outage frequency f 2 with f2 ≈ 2.2 × f 1. Duty cycle in normal flashing mode: 50% Duty cycle in lamp outage mode: 40% (bright phase) 3.2 Start Input Right and Left (Pin 2 and 3) Flashing is disabled as long as the input comparator is tied to GND (pull-down resistor R 7 or R5). The high-side flasher switch left or right changes the comparator status and enables the output stage at pin 11 or pin 13. R 6 and R4 are protection resistors for the input stage. With an open flasher switch the current consumption is only I < 10 µA. The IC is kept in stand-by mode until there is a voltage drop of V ≈ 6.9V at the pull-down resistor. Direction mode can only be activated when the ignition switch is in the ON-position as shown in Figure 1-1 on page 2. 3.3 Start Input Hazard Warning (Pin 4) In contrast to the direction switches, the hazard input is a low-side type. The pull-up resistor R 10 provides the off-state. R 3 is a protection resistor for the input stage. Hazard warning can be acti- vated independent of the ignition switch position. 3.4 Supply Voltage Sense (Pin 5) This pin supplies the lamp outage comparator at pin 8 and is externally connected to the battery (Kl 30). 3.5 Control Input Relay 1 and 2 (Pin 6 and 7) The feedback detects the bright phase and the dark phase and enables the oscillator. f 1 1 R 1 C 1 × 1.5 × -------------------------------------Hz ≈ |
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