U6801B Single-Channel Driver with Thermal Monitoring Description The singel-channel driver IC includes one non-inverted and current-limited output stage with an open collector. Thermal shutdown protects the output against critical junction temperatures. The output can sink a current of 20 mA. The digital input has Schmitt-trigger function with pull-up resistors to 5 V. Features Input comparator with Schmitt-trigger characteristic ESD protection acording to human body model: 2000 V (C = 100 pF, R = 1.5 k) Input clamping current capability of10 mA Output stage: Integrated protection cells dedicated to all input stages - Short-circuit protected (EMC, ESD, RF) Shutdown by junction-temperature monitor - Load-dump protected @ 1 k Reset with hysteresis at low voltage - Jump start possible Block Diagram / Applications n.c. n.c . 1 VS 7 VO 3 4 Thermal shutdown 2 GND Undervoltage detection VS 5 n.c. n.c. VI Figure 1. Block diagram / applications Ordering Information Extended Type Number Package U6801B-FP SO8 Rev. A3, 28-Mar-01 Remarks 1 (5) U6801B Pin Configuration Pin n.c. 1 8 n.c. GND 2 7 VS n.c. 3 6 n.c. VO 4 5 VI Symbol Function 1 n.c. 2 GND Not connected 3 n.c. Not connected 4 VO Output 5 VI Input 6 n.c. Not connected 7 VS Supply voltage 5 V 8 n.c. Not connected Ground Figure 2. Pinning Basic Circuitry The integrated circuit U6801B requires a stabilized supply voltage (VS = 5 V5%) to comply with its electrical characteristics. An external buffer capacitor of C = 100 nF value is recommended. An integrated 14-V Zener diode between VS and ground protects the supply pin. Current Limitation of the Output Stages and Overtemperature Shut-down A temperature-dependent current limitation in the range of 25 to 100 mA protects the stage in case of a short. Additionally, the chip temperature is monitored. For Tchip > 148C, the output is disabled and automatically enabled with a hysteresis of TChip > 5C. The input stage is provided with an integrated 250-k pull-up resistor and can be directly connected to a microcontroller. The output stage is an open collector - capable of sinking 20 mA. Recommended external components: Pull-up resistor, R = 1 k Capacitor to GND, C = 470 pF, see figure 3 Functional Description Transients and Load Dump An integrated 28-V Zener diode protects the output stage against transients and load-dump (Schaffner pulses). With the help of external 1-k resistor, the output transistor is capable to handle the corresponding current which flows during each of these conditions. Apart from that, the output is short circuit and overload protected. General ON state: Low level at the input stage activates the output stage. OFF state: The internal pull-up resistor provides high level to the input comparator and deactivates the output stage. A 7-V Zener diode between input pin and GND is capable of 10 mA clamping current. 2 (5) Low-Voltage Detection When the supply voltage is switched on, a power-on reset pulse is generated internally which disables the output stage until a defined supply-voltage level is reached. The low-voltage detection is provided with a hysteresis of Vhyst = 0.5 V typically. Rev. A3, 28-Mar-01 U6801B VS=5 V VBatt Load R 1k 100 nF Micro- controller VI U6801B VO C 470 pF Figure 3. Application schematic Absolute Maximum Ratings Parameters Symbol Value Unit VS 7.0 V Ambient temperature range Tamb -40 to +125 C Storage temperature range Tstg -50 to +150 C Tj +150 C Symbol Value Unit RthJA 160 K/W Supply voltage Maximum junction temperature Thermal Resistance Parameters Junction ambient Electrical Characteristics VS = 5 V5%, Tamb = 27C, reference point pin 2 (GND), unless otherwise specified, see figures 1 and 3. Parameters Max. Unit 4.75 5.25 V IS IS 0.8 7 3.2 13 mA mA VTH(ON) VTH(OFF) 3.7 3.0 4.6 3.8 V V Low-voltage hysteresis Vhyst 0.55 1.05 V Temperature shutdown TChip 140 149 C Temperature shutdown hysteresis Thyst 5 Supply Test Conditions / Pins Min. VS Typ. Pin 7 Supply voltage Supply current Input open Input closed to GND Low-voltage detection threshold: ON OFF Rev. A3, 28-Mar-01 Symbol C 3 (5) U6801B Electrical Characteristics (continued) VS = 5 V5%, Tamb = 27C, reference point pin 2 (GND), unless otherwise specified, see figures 1 and 3. Parameters Input Test Conditions / Pins Symbol Min. VI 6.7 Typ. Max. Unit 8.5 V 10 mA 305 k Pin 5 Zener-diode protection voltage II = 10 mA Zener-diode clamping current II Pull-up resistor RI Switching threshold OFF ON Hysteresis Output 170 250 VI VI 3.3 1.8 V V Vhyst 1.5 V Pin 4 Zener-diode protection voltage IO = 10 mA VO 26.5 V Integrated capacitor 5 Leakage current Saturation voltage (IO = 20 mA) Current limitation 2.5 A VSat 0.7 V 100 mA 5 s Ilimit Propagation delay (470 pF, 1 k, 20 V) pF ILeak 25 td Package Information Package SO8 Dimensions in mm 5.2 4.8 5.00 4.85 3.7 1.4 0.25 0.10 0.4 1.27 6.15 5.85 3.81 8 0.2 3.8 5 technical drawings according to DIN specifications 13034 1 4 (5) 4 Rev. A3, 28-Mar-01 U6801B 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, 28-Mar-01 5 (5)