U2044B-MFPG3Y Atmel, U2044B-MFPG3Y Datasheet - Page 5

• Manufacturer Part Number: U2044B-MFPG3Y
• Description: IC FLASH CONTROL 10W DUAL 14SOIC
• Manufacturer: Atmel
• Type: Automotive, Flasherr

Specifications of U2044B-MFPG3Y

• Current - Supply: 10µA
• Current - Output: 100µA
• Voltage - Supply: 8 V ~ 18 V
• Operating Temperature: -40°C ~ 100°C
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

3.6
3.7
3.8
3.9
3.10
4721C–AUTO–02/08
Lamp Outage Detection (Pin 8)
Supply Voltage (Pin 9)
GND (Pin 10)
Control Output Relay 1 and 2 (Pin 11 and 13)
Supply Voltage Power (Pin 12)
The lamp current is monitored via an external shunt resistor, R
K1, with its reference voltage of typically 81 mV (V
lamps is detected according to the following calculation:
Nominal current of 1 lamp: 21W/(V
Nominal current of 2 lamps: 2
We recommend setting the detection threshold in the middle of the current range: I
Thus the shunt resistor is calculated as:
R
R
Comparator K1’s reference voltage is matched to the characteristics of filament lamps (see sec-
tion “Control Signal Threshold”).
The combination of the shunt resistor and the resistance of the wire harness prevents pin 8 from
a too high voltage in the case of shorted lamps.
This pin supplies the oscillator, the comparators and the logic parts of the IC.
The integrated circuit is protected against transients according to ISO-TR 7637-3 level 3 via
resistor R
R
battery.
The relay control outputs are high-side drivers with a low saturation voltage and capable of driv-
ing a typical automotive relay with a coil resistance of 60 .
This pin supplies the relay drivers connected directly to the battery (Kl 30). It is internally
clamped by a 27-V Z-diode.
Shunt
Shunt
3,
R
4,
= V
= 81 mV/2.7 A = 30 m
R
6,
T
2
R
(K1)/I
to ground (–31). An integrated protection circuit together with external resistors R
8
and R
outage
9
limits the current pulses in the IC. The IC is also protected against reversed
21W/(V
S
= 12V):
S
= 12V):
S
= 12V). The outage of one lamp out of two
I
I
lamp
lamp
= 1.75A
= 3.5A
Shunt
and an internal comparator,
U2044B
outage
2.7A
2,
5