DocID16887 Rev 3

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STM6700, STM6710

Device operation

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4.2

Adjustable thresholds (input configurations)

The STM6700/STM6710 may be configured to monitor several options with adjustable reset

thresholds. The threshold voltages at each adjustable input VxIN is typically 0.62 V. Thus to

monitor a voltage > 0.62 V, a resistor divider network as shown in Figure 7 can be used.

The STM6710 allows users to customize the minimum voltage sense level with adjustable

reset thresholds. The threshold voltage at each adjustable input VxIN is typically 0.62 V.

For example, the user can adjust the voltage input threshold (VTHx) for V1IN, V3IN and

V4IN inputs. To do this, connect an external resistor divider network to the VxIN pin in order

to set the trip point to some other voltage above 620 mV according to Equation 1 and

Equation 2 which is also shown in Figure 7.

Equation 1

or solved in terms of R1:

Equation 2

The STM6700/STM6710 have an input current of less than ±0.2 µA (±0.4 µA for VIN1)

on their adjustable inputs, therefore resistor values of up to 100 kW can be used for R2

with < 1 % error.

Figure 7. Adjustable thresholds monitoring

0.62V

R1 R2

+

()

R2

---------------------------

×

=

R1

R2

0.62V

----------------1

–

⎝⎠

⎛⎞

=