SparkFun Electronics Comments

PointyOintment on COM-10828 - Voltage Detector - NCP303

2016-11-29T01:19:02-07:00

Probably not too difficult. You’d need a separate switching device (such as a logic level MOSFET) in series with the battery to disconnect it from the load, as well as a resistor voltage divider to scale the battery’s voltage threshold down to the 0.9 V threshold of this detector.

You would also need some way for it to latch in the off state. I would first try to simply put the voltage detector distal to the MOSFET so it loses power and can’t turn back on. The problem with that is that once it turns off, the MOSFET is undriven and may pass a small current, possibly leading to oscillation (and of course further battery drain). Maybe a bias resistor could work. Or you could put the detector on the proximal side of the MOSFET and short pin 5 to ground so it never charges, but that would consume some (very small, but still there) quiescent current after it’s turned off the battery.

No guarantees—test it yourself to be sure.

PointyOintment on COM-10828 - Voltage Detector - NCP303

2016-11-29T01:06:10-07:00

You can use a resistor voltage divider to scale your supply voltage down to its detection voltage.

maxrate on COM-10828 - Voltage Detector - NCP303

2015-09-06T20:57:32-06:00

I’m a little confused about the operation of this (specific) component. Does this detect a 0.9V drop, then flag a reset? What if I’m using a 5V micro controller, and the power drops to 4.0/4.1 volts, will the part flag a reset or will it only flag a reset when the supply voltage is 0.9 volts of less? I’m trying to determine how useful this particular product number with 3.3/5.0 uC parts given that it’s configured for 0.9 volts.

Beelzebot on COM-10828 - Voltage Detector - NCP303

2013-07-02T00:27:38-06:00

Could one of these be used to prevent over discharging of a Lipo cell or pack ?

tparker on COM-10828 - Voltage Detector - NCP303

2011-07-21T12:12:28-06:00

Is this the voltage detector from the XMOS Development Board?
The new product post said that this part is leftover from a product you no longer build. Does this mean you are not planning on restocking on XMOS?

bbotany on COM-10828 - Voltage Detector - NCP303

2011-07-15T13:14:48-06:00

I had the same question. It appears that the chip here is open-drain (active low) with a threshold at 0.9V (+/-2%). Hysteresis should be between 0.02V and 0.06V.

RobertC. on COM-10828 - Voltage Detector - NCP303

2011-07-15T09:03:56-06:00

oops, cut off the complete model number. check above, it’s the NCP303LSN09T1G.

Customer #32561 on COM-10828 - Voltage Detector - NCP303

2011-07-15T08:29:35-06:00

Which threshold voltage does this device have? There are several variants.