U2044B
Dual Output Flasher
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
D
Very low susceptibility to EMI
D
Protection according to ISO/TR7637/1 level 4
D
Extremly low current consumption < 10
m
A
(@switches open)
D
Minimum lamp load for flasher operation:
w
1 W
Package
DIP14
SO14
D
Reverse polarity protection
D
Three control inputs: left, right and hazard warning
Ordering Information
Extended Type Number
U2044B
U2044B-FP
Remarks
Pin Description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Symbol
OSC
SIL
SIR
SIHW
V
S
CR1
CR2
LD
V
S
GND
OR1
V
S
OR2
OSC
Function
Oscillator
Start input left
Start input right
Start input hazard warning
V
S
Control input relay 1
Control input relay 2
Lamp failure detection
V
S
IC ground
Output relay 1
V
S
Output relay 2
Oscillator
OSC
SIL
SIR
SIHW
V
S
CR1
CR2
1
2
3
4
5
6
7
14 OSC
13 OR2
12 Vs
U2044B
11 OR1
10 GND
9
8
V
S
LD
12750
Figure 1. Pinning
TELEFUNKEN Semiconductors
Rev. A1, 25-Feb-97
1 (6)
TEMIC [ TEMIC SEMICONDUCTORS ]
