Datasheet

Operation STM6700, STM6710
8/21 Doc ID 16887 Rev 2
2 Operation
The STM6710 is capable of monitoring up to 4 voltages in a multisupply application. The
device is available in several preset voltage thresholds for power supplies of 1.8 V, 2.5 V,
3.0 V, 3.3 V and 5.0 V. The STM6710 is powered by the V2IN pin which is also a monitored
voltage, thus making this a quad voltage monitor. The STM6710Q and STM6700 use this
pin as V
CC
which is not monitored and thereby limits these devices to three adjustable
voltage inputs. If any of the monitored input voltage falls below its associated threshold, the
active low reset output is asserted and remains low as long as V1IN or V2IN remains above
1.0 V.
Figure 4. Hardware hookup (typical application diagram)
2.1 RESET output configuration
The RESET output asserts low if a monitored input voltage drops below its threshold. This is
an open drain with a weak internal pull-up to V2IN or the V
CC
supply, and is typically 10 µA.
However, many applications may not require an external pull-up resistor. In case a pull-up
resistor is required and is connected to a voltage ranging from 0 to 5.5 V (as shown in
Figure 5), it can overdrive the weak internal pull-up. The STM6710 has built-in circuitry to
prevent this reverse current flow to V2IN under this condition.
Figure 5. Interface to external pull-up using a different supply voltage
V1IN
V2IN (V
CC
)
V3IN
V4IN
RESET
GND
SUPPLIES
TO BE
MONITORED
µP
STM6710
AM04620v1