FM2044 Shanghai Fudan Microelectronics Co., Ltd., FM2044 Datasheet - Page 3

• Manufacturer Part Number: FM2044
• Description: Dual Output Flasher
• Manufacturer: Shanghai Fudan Microelectronics Co., Ltd.

Description
The integrated circuit FM2044 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 extreme low current
consumption the FM2044 can be directly
connected to the battery.
Features
FM2044 Dual Output Flasher
Temperature and Supply Voltage
Compensated Flashing Frequency
Frequency Doubling Indicates Lamp
Outage
Two Relay Driver Outputs with High
Current-carrying Capacity and Low
Saturation Voltage
Minimum Lamp Load for Flasher
Operation: ≥ 1 W
Very Low Susceptibility to EMI
Protection According to ISO/TR7637/1
Level 4
Extremely Low Current Consumption <
10 µA (with Switches Open)
Reverse Polarity Protection
Three Control Inputs: Left, Right and
Hazard Warning
Pin Assignment
Pin Function
Pin
10
12
13
14
11
1
2
3
4
5
6
7
8
9
Ver 1.1
Symbol
SIHW
OSC
GND
OSC
OR1
CR1
CR2
OR2
SIR
SIL
LD
V
V
V
S
S
S
Oscillator
Start input left
Start input right
Start input hazard warning
V
Control input relay 1
Control input relay 2
Lamp failure detection
V
IC ground
Output relay 1
V
Output relay 2
Oscillator
S
S
S
Function
Specification
3