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PDF U643 Data sheet ( Hoja de datos )
| Número de pieza | U643 | |
| Descripción | Flasher/ 30-mohm Shunt | |
| Fabricantes | ATMEL Corporation | |
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Flasher, 30-mW Shunt
U643B
Description
The bipolar integrated circuit U643B is used in relay-
controlled automotive flashers where a high-level EMC
is required.
Lamp outage is indicated by frequency doubling during
hazard warning as well as direction mode.
Features
D Temperature and supply voltage compensated
flashing frequency
D Frequency doubling indicates lamp outage
D Relay driver output with high current
carrying capacity and low saturation voltage
D Minimum lamp load for flasher operation: ≥ 1 W
D Very low susceptibility to EMI
D Protection according to ISO/TR 7637/1 level 4
Block Diagram
C1
4
6
Measuring comparator K 1
V6–81 mV
K1 20 kW
2
5 kW
7
R3
Shunt
30 mW
+ VS
+ 49
K2
R1
Pulse
generator
49 a–Comparator K2
20 kW
49 a–Comparator K3
K3
5
20 kW
95 9756
3
Relay
8 R2
23 V
5 kW
IC Ground
1
1.5...2.2 kW
R4
470 W
49 a
5 W 21 W 21 W 21 W 21 W 5 W
GND
– 31
Indicator lamps
Figure 1. Application circuit as a car flasher, Resistor R1 and R2: 1/4 Watt
R4 for protection against continuous reversed polarity: 0.5 Watt
Ordering Information
Extended Type Number
Package
Remarks
U643B
DIP8
U643B-FP
SO8
Rev. A3, 10-Apr-01
1 (5)
1 page  
U643B
Ozone Depleting Substances Policy Statement
It is the policy of Atmel Germany GmbH to
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems
with respect to their impact on the health and safety of our employees and the public, as well as their impact on
the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances (ODSs).
The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid
their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these
substances.
Atmel Germany GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed
in the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively
2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency (EPA) in the USA
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively.
Atmel Germany GmbH can certify that our semiconductors are not manufactured with ozone depleting substances
and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each customer
application by the customer. Should the buyer use Atmel Wireless & Microcontrollers products for any unintended
or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers against all claims,
costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death
associated with such unintended or unauthorized use.
Data sheets can also be retrieved from the Internet: http://www.atmel–wm.com
Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423
Rev. A3, 10-Apr-01
5 (5)
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet U643.PDF ] | |
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