Other Parts Discussed in Thread: TPS3700, TPS3701
Deas TI-Support team,
was looking for window voltage monitor (separate UV, OV outputs in OD configuration) to supervise a processor core voltage. Processor datasheet specifies a recommended core voltage range of 1V ± 3%.
At a first glance, TPS3702 was looking promising, but the trigger threshold accuracy of 0.9% could be an issue.
As a working assumption, let’s select TPS3702BX10. SET pin is HIGH. This would result in following worst case trigger thresholds:
OV trigger: 1V +2.1 .. 3.9%
UV trigger: 1V -2.1..3.9%
Under w.c. conditions, voltage monitor could already assert UV or OV output for core voltage levels of 1V ± 2.1%, what is within the recommended operation range of the processor (1V ± 3%). On the other hand, monitor could trigger latest, if core voltage leaves 1V ± 3.9% window. From 1V ±3%..3.9% the processor is not running under recommended operating conditions while the monitor outputs are not asserted.
Playing with the monitor threshold classes (A, B, C, D) and the SET pin options doesn’t solve the problem. Lowering the overlapping voltage window of voltage monitor and recommended processor core voltage, the out of spec voltage range for which monitor outputs remain inactive increases as a consequence.
Is there any monitor device you can advise in order to meet above requirements better than TPS3702?
