Good day to all. I am at the tail end of redoing a project from a couple of years=20 ago. Its a device that runs from a pair of NiMh batteries and I'm=20 using a 10LF22 powered right from the 2.4V battery. However, I'm having a problem that is most likely caused by a mistake=20 that I made with the config word. The datasheet says that the 10LF322 will run down to 1.8V. However,=20 it appears that I'm getting some form of brownout that occurs right=20 at 2.0Vdc. The PIC ceases operating and the only thing that will=20 restore it is cycling power. This device has a pair of DC-DC converters in it - one runs at 7.5Vdc=20 at perhaps 10mA, the other runs at 5.7Vdc with peak currents=20 exceeding 2A. I'm getting a brownout situation when the battery is=20 somewhat discharged but nowhere near dead. I recall that I had a real problem getting this chip to even work at=20 low voltages. I wound up using the following config string: __config _PWRTE_OFF & _WDTE_OFF & _FOSC_INTOSC & _CP_OFF &=20 _MCLRE_OFF & _BOREN_OFF & _LPBOR_OFF & _BORV_19 & _LVP_OFF If I recall correctly, the magic occurred when I added "LPBOR_OFF" to=20 the above string. However, I'm doing some in-depth testing and am now finding this=20 problem. It looks as if this will explain some failures that have=20 occurred in the field. There is a 100uF ceramic capacitor across the battery terminals and=20 another 100uF cap after the FET switch that applies power to the=20 DC-DC converters. The FET is controlled by the PIC and serves to=20 remove power after several hours of non-use. The PIC itself remains=20 running after the unit is shut down but it is running at its slowest=20 oscillator speed. The funny thing is that if I dip the supply below 2.0V (say, 1.5V),=20 then restore the voltage to above 2.1Vdc, the circuit keeps=20 operating. It might be actually doing a full power-up reset but that=20 is quick enough that it isn't a problem. But if the supply voltage=20 dips to 2.0V, the PIC appears to lock up. Varying the supply voltage from 1.0 through 2.5V after the PIC has=20 locked up has no effect. Dropping the supply voltage down to zero=20 volts, then restoring to above 2V starts everything back up. I'm kind of in a pinch here - this project delivers at the end of=20 this month. Any suggestions gratefully accepted. Many thanks! dwayne --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .