Rohm is aiming at automotive and industrial equipment requiring functional safety with a 40V window voltage detector and reset IC.
Called BD48HW0G-C, its supply pin is allowed up to 42V abs max, as are the two (40mA abs max) open-drain output pins. The inputs can handle a maximum of 7V – and maximum junction temperature is 150°C.
Recommended operation is 1.8 – 40V supply, 0 – 6V on the inputs, and over -40 to +125°C.
The detection threshold is typically 1.277V and the company claims detection accuracy to be within ±0.75% over its temperature range.
Consumption is typically 500nA (2μA max) and to this has to be added the three-resistor potentiometer needed to set the upper and lower thresholds. Although Rohm describes this as a ‘nano enewrgy’ product, the data sheet says: “Determine external resistance value so that the current flowing through external resistors is 10μA or more.”
In use, the under and over-voltage threshold open drain outputs can be paralleled to reset a microcontroller (diagram left), for example. Output capacitors can be added to alter rise time. An additional RC filter can be needed under certain fast power-up circumstances to unsure correct operation (data sheet fig 16).
It is AEC-Q100 Grade 1 qualified, and Rohm describes it as one of its “functional safety supportive automotive products”.
Packaging is SSOP6 (similar to JEDEC SOT-23-6).
“Rohm plans to expand its line-up of high voltage single-type voltage detectors with fixed detection voltage,” according to the company, which added that the above part is available from Digi-Key, Mouser, and Farnell.
The BD48HW0G-C product page is here and the data sheet can be found here
note: the input diodes are parasitic
