Datasheet

8 October 2010
2
Output Signals
The comparator output signals (CO1, CO2, CO3, CO4, CO5, CO6, AO) are
taken from jumper J3.
3 Resistor Voltage Divider
No 3 resistor voltage divider (R7, R8, R9) is populated on Channel 1 to allow
customer the flexibility to select resistors in order set their own voltage detection
window. See the 3 RESISTOR VOLTAGE DIVIDER SELECTION section of the
LMV7231 datasheet for proper resistor selection. Remaining channels have their
3 resistor voltage dividers populated to detect the windows in the table below and
are optimized for a signal rising into and out of the voltage detection window.
Table 1. Voltage Detection Windows
Channel Window Min Max
1 Open NA NA
2 3.3V +/-5% 3.135V 3.465V
3 2.5V +/- 5% 2.375V 2.625V
4 1.8V +/- 5% 1.71V 1.89V
5 1.2V +/- 5% 1.14V 1.26V
6 1.0V +/- 5% 0.95V 1.05V
Output Pull-up Resistors and Capacitive Loads
Output pull-up resistors (R19, R20, R21, R22, R23, R24, R25) and capacitive
load (C2, C3, C4, C5, C6, C7, C8) can be adjusted to meet customer evaluation
requirements. By default pull-up resistors are 10 kΩ and capacitive load is
unpopulated.
VPU
VPU is the output pull-up resistor voltage and can be pulled up to any voltage
within the Abs Max ratings of the LMV7231. By default VPU is set to V+ with a
jumper at J1.
AOSEL
The state of AOSEL pin determines whether the AO pin is active on an over-
voltage or under-voltage event. When tied LOW the AO output will be active
upon an over-voltage event. By default AOSEL is set LOW with jumper J4
shorting AOSEL to GND.
COPOL
The state of the COPOL pin determines whether the CO1-CO6 pins are active
“HIGH” or “LOW”. When tied LOW the CO1-CO6 outputs will go LOW to indicate
an out of window comparison. By default COPOL is set LOW with jumper J5
shorting COPOL to GND.