STM6700 STMicroelectronics, STM6700 Datasheet - Page 11

• Manufacturer Part Number: STM6700
• Description: (STM6700 / STM6710) Microprocessor Supervisors And Reset ICs
• Manufacturer: STMicroelectronics

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STM6700, STM6710
2.2
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
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 the following formula which
is also shown in
or solved in terms of R1:
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 kΩ can be used for R2 with
<1% error.
Figure 7.
Adjustable thresholds monitoring
Figure
R1 = R2 [(VxINTH/0.62V)–1]
7.
Doc ID 16887 Rev 1
V
V
xINTH
THx
R1
R2
R1
=
=
0.62
R2
⎛
⎜
⎝
0.62V
V
V
THx
×
V
REF
(R1
−
= 0.62V
R2
1
+
⎞
⎟
⎠
R2)
Figure 7
Operation
below
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