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ADM6339KARJZ-RL7 Arkusz danych(PDF) 8 Page - Analog Devices

Numer części ADM6339KARJZ-RL7
Szczegółowy opis  Quad Voltage Microprocessor Supervisory Circuit
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ADM6339KARJZ-RL7 Arkusz danych(HTML) 8 Page - Analog Devices

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ADM6339
Rev. A | Page 8 of 12
THEORY OF OPERATION
The ADM6339 is a compact, low power supervisory circuit that
is capable of monitoring up to four voltages in a multisupply
application.
The device includes several factory-set voltage threshold options
for monitoring −5.0 V, +1.8 V, +2.5 V, +3.0 V, +3.3 V, and +5.0 V
supplies. The ADM6339 is available with one to three adjustable
threshold options. The adjustable voltage threshold options
available are +1.23 V, +0.62 V, and −0.5 V. See the Ordering Guide
section for a list and description of all available options.
INPUT CONFIGURATION
Built-in hysteresis improves the ADM6339’s immunity to short
input transients, without noticeably reducing the threshold
accuracy. The internal comparators each have a hysteresis of
0.3% with respect to the reset threshold voltage. (The IN4 input
of the ADM6339Q model has a hysteresis of 0.47% with respect
to its reset threshold voltage of −0.487 V.)
Monitored inputs are resistant to short power supply glitches.
Figure 6 depicts the ADM6339 glitch immunity data. To
increase noise immunity in noisy applications, place a 0.1 μF
capacitor between the IN2 input and ground. Adding capacitance
to IN1, IN3, and IN4 also improves noise immunity.
IN1
ADM6339
MONITORED
SUPPLIES
MICROPROCESSOR
IN2
RESET
IN3
IN4
GND
Figure 13. Typical Applications Circuit
IN2 must always be used for normal operation because it is the
device’s power supply input. Do not allow unused monitor
inputs to float or to be grounded. Unused IN3 or IN4 inputs with
positive thresholds can be connected directly to the IN2 input.
Unused IN4 options with negative thresholds must be tied to a
more negative supply.
MONITORING NEGATIVE VOLTAGES < −5.0 V
A number of ADM6339 models include a pretrimmed threshold
option to monitor −5.0 V voltage levels. Use a low impedance
resistor divider network similar to that shown in Figure 14 to
monitor supplies more negative than −5.0 V.
The current through the external resistor divider should be
greater than the input current for the −5.0 V monitor options.
For an input monitor current error of <1%, the resistor network
current should be greater than or equal to 2 mA (for IIN4 = 20 μA
maximum). Set R2 = 2.5 kΩ. Calculate R1 based on the desired
VINTH reset threshold voltage, using the following equation:
R1 = R2((VINTH/VTH) − 1)
where:
R2 ≤ 2.49 kΩ.
VINTH is the desired threshold voltage.
VTH is the internal threshold voltage.
For example, when monitoring a nominal voltage of −12 V,
VINTH = −11.1 V, VTH = −4.63 V, and R2 = 2.49 kΩ. Therefore,
using the previous equation, R1 = 3.48 kΩ.
R2
R1
VINTH
ADM6339
Figure 14. Negative Voltage Monitoring
USER ADJUSTABLE THRESHOLD OPTIONS
The ADM6339 offers the choice of three adjustable INx input
threshold voltages: +1.23 V, +0.62 V, or −0.5 V.
When using an adjustable threshold of 1.23 V (typical), to
monitor a voltage greater than 1.23 V, connect a resistor divider
network to the device as shown in Figure 15. VINTH, the desired
threshold voltage, can be expressed as
VINTH = 1.23 V((R1 + R2)/(R2))
The ADM6339 has a guaranteed input current of ±0.1 μA on its
1.23 V adjustable input. Resistor values up to 100 kΩ can be
used for R2 with <1% error.
VINTH
R1
R2
VREF = 1.23V
ADM6339
Figure 15. Setting the 1.23 V Adjustable Monitor
The same approach is taken when using the 0.62 V (typical)
adjustable threshold input. Use the following equation to solve
for the values of R1 and R2:
VINTH = 0.62 V((R1 + R2)/(R2))
The 0.62 V (typical) adjustable threshold input offers high
threshold accuracy of ±0.8%.


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