ispPAC-POWR607-01NN32I Lattice, ispPAC-POWR607-01NN32I Datasheet - Page 11

• Manufacturer Part Number: ispPAC-POWR607-01NN32I
• Description: Supervisory Circuits Prec. Prog. Pwr Sppl y Seq. Mon. I
• Manufacturer: Lattice

Specifications of ispPAC-POWR607-01NN32I

• Number Of Voltages Monitored: 6
• Undervoltage Threshold: 0.8 V
• Output Type: Open Collector / Drain
• Manual Reset: Resettable
• Watchdog: Watchdog
• Power-up Reset Delay (typ): 300 us
• Supply Voltage (max): 3.96 V
• Supply Voltage (min): 2.64 V
• Supply Current (typ): 3.5 mA
• Mounting Style: SMD/SMT
• Package / Case: QFN-32
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Lattice Semiconductor
Each comparator outputs a HIGH signal to the PLD array if the voltage at its positive terminal (VMONx pin) is
greater than its programmed trip point setting, otherwise it outputs a LOW signal.
A hysteresis of approximately 1% of the setpoint is provided by the comparators to reduce false triggering as a
result of input noise. The hysteresis provided by the voltage monitor is a function of the input divider setting.
Table 4-3 lists the typical hysteresis versus voltage monitor trip-point.
Programmable Over-Voltage and Under-Voltage Thresholds
Figure 4-9 (a) shows the power supply ramp-up and ramp-down voltage waveforms. Because of hysteresis, the
comparator outputs change state at different thresholds depending on the direction of excursion of the monitored
power supply.
Figure 4-9. (a) Power Supply Voltage Ramp-up and Ramp-down Waveform and the Resulting Comparator
Output, (b) Corresponding to Upper and Lower Trip Points
During power supply ramp-up the comparator output changes from logic 0 to 1 when the power supply voltage
crosses the upper trip point (UTP). During ramp down the comparator output changes from logic state 1 to 0 when
the power supply voltage crosses the lower trip point (LTP). To monitor for over voltage fault conditions, the UTP
should be used. To monitor under-voltage fault conditions, the LTP should be used.
Tables 1 and 2 show both the under-voltage and over-voltage trip points, which are automatically selected in soft-
ware depending on whether the user is monitoring for an over-voltage condition or an under-voltage condition.
Comparator Logic Output
UTP
4-11
LTP
ispPAC-POWR607 Data Sheet
(a)
(b)