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U2044B-FP Datasheet

Dual Output Flasher

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Dual Output Flasher
U2044B
Description
The integrated circuit U2044B 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 indi-
cated by frequency doubling during direction mode.
Thanks to the extreme low current consumption U2044B
can be connected to the battery directly.
Features
D Temperature and supply voltage compensated
flashing frequency
D Frequency doubling indicates lamp outage
D Two relay driver outputs with high current-carrying
capacity and low saturation voltage
wD Minimum lamp load for flasher operation: 1 W
D Very low susceptibility to EMI
D Protection according to ISO/TR7637/1 level 4
D Extremly low current consumption < 10 mA
(@switches open)
D Reverse polarity protection
D Three control inputs: left, right and hazard warning
Ordering Information
Extended Type Number
U2044B
U2044B-FP
Package
DIP14
SO14
Remarks
Pin Description
Pin Symbol
Function
1 OSC Oscillator
2 SIL Start input left
3 SIR Start input right
4 SIHW Start input hazard warning
5 VS VS
6 CR1 Control input relay 1
7 CR2 Control input relay 2
8 LD Lamp failure detection
9 VS VS
10 GND IC ground
11 OR1 Output relay 1
12 VS VS
13 OR2 Output relay 2
14 OSC Oscillator
OSC 1
SIL 2
SIR 3
14 OSC
13 OR2
12 Vs
SIHW 4 U2044B 11 OR1
VS 5
10 GND
CR1 6
CR2 7
9 VS
8 LD
12750
Figure 1. Pinning
TELEFUNKEN Semiconductors
Rev. A1, 25-Feb-97
1 (6)
TEMIC Semiconductors
TEMIC Semiconductors



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