For Automotive Applications
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Featured products - R3152 -
August 1, 2018
The R3152 has a wide operation voltage range from 3.0 to 42V and therefore tolerates a fluctuation in its power supply even during a severe cranking condition. Additionally, it can be powered directly from the primary power supply or battery and is functioning independent from the power source for the processor. Also note that the Vdd pin and sense pin of the R3152 are separated; so the output remains stable even if the sense pin voltage falls to 0V. It already operates before the external LDO or DC/DC Converter has started up, providing a more secure supervision and guarantees a proper reset signal.
The R3152 has a very robust design; a short between adjacent pins will not lead to any damage of the chip. In particular, the Cd pin has a high voltage rating of 50V in order to tolerate a short with the adjacent Vdd pin.
As for the output delay time, it can be specified by using an external capacitor connected to the Cd pin. In this way one can set the delay time long enough to reset the processor properly. The R3152 has an N-channel open drain output that needs a pull-up resistor to specify the logical high signal.
The detection and release threshold for overvoltage and undervoltage are internally set, currently we have product versions available to monitor popular supply voltages 5.0V and 3.3V but other threshold settings can be specified on request as well.
Conventional products often have a moderate detection threshold and hysteresis accuracy level in the range of 2.5 – 3.0%. The R3152 offers an outstanding detection accuracy of -1.25 to +0.75% and a hysteresis of 1.5% at an operating temperature range from -50 to +125°C. This kind of solution provides better overall accuracy monitoring even when using a 2% LDO or DC/DC Converter. Refer to the illustration for details
Output Voltage = 5.0 V, UV = 4.65 V, OV = 5.35 V
Hysteresis = 3.0% (Max), Ta = −50°C to 125°C
Output Voltage = 5.0 V, UV = 4.7 V, OV = 5.3 V
Hysteresis = 1.5% (Max), Ta = −50°C to 125°C
The R3152 is intended for use in a wide variety of applications that require a higher degree of reliability; we have product versions available for automotive, industrial, as well as consumer equipment. It monitors for any excessive increase or decrease of the processor’s supply voltage with high accuracy, whereby a failure of the system is detected at an early stage. This is especially important for safety-critical automotive applications because it significantly improves functional safety, useful for ASIL-B / C systems including ECU, ADAS and control units, including EV converters and charge regulators.
Two product versions in SOT-23-6 package can be ordered; the A-version has a voltage detector with hysteresis whilst the B-version is supplied without this function.
The R3152 is included in our product longevity program in order to support specific long-term projects; products included in this program remain available for at least 10 years.