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The ranges of on and off thresholds are shown in Table 6 and
the programming codes for the selected-thresholds are found in
Table 7. The default on threshold is 7.47 V and off threshold is
6.95 V. Similarly, the ranges of shutdown hold and delay times
are shown in Table 8, and the programming codes of the selected
timings are found in Table 9. The default shutdown hold time is
10 ms and the delay time is 100 ms.
V
is ignored if V
2MON_OFF
2MON_OFF
V
cannot equal V
2MON_OFF
2MON_ON.
If V
is selected with rising edge triggered wake-up mode,
2MON
only the on threshold is monitored and the off threshold
is ignored. V
is put into rising edge triggered mode by
2MON
setting V
off threshold, Register 0x04[3:0] to 1001
2MON
The voltage at V
provides the power for the AD5100, but a
1MON
valid signal on V
must be present before the internal V
2MON
starts operating. Details are explained in the Power Requirements
section.
V
exhibits typical input resistance of 675 kΩ that users
2MON
should take into account for loading effect.
V
3MON
V
is a low voltage monitoring input that controls the
3MON
RESET function of an external device.
The V
pin is monitored by a comparator to detect an
3MON
undervoltage condition. It is designed with 1.5% hysteresis.
When the V
input drops below the programmed UV
3MON
threshold, the comparator becomes active immediately, indi-
cating that a UV condition has occurred. Due to hysteresis,
the V
input must be brought above the programmed UV
3MON
threshold by 1.5% before the comparator becomes inactive,
indicating that the UV condition has gone away (see Figure 9).
V
V
3MON
RESET
NOTES
1. * = PROGRAMMABLE
is greater than V
but
2MON_ON
t
GLITCH
3MON
t
RS_HOLD*
Figure 10. V
V
3MON
V
3MON_UV
The V
comparator is used (in conjunction with a hold
3MON
timer) to control the RESET pin.
V
monitors inputs from 2.0 V to 5.5 V. It has an 8-step
3MON
programmable reset threshold (Register 0x05) with an 8-step
0.1 ms to 200 ms reset hold time (t
means that the RESET output remains activate when V
REG
above its UV threshold, until t
the reset of an external device to be held until the programmed
time is reached.
and RESET timing diagrams are shown in
The V
3MON
The range of thresholds is shown in
code for the selected threshold is found in
reset hold times is shown in
of the selected timing is found in
V
exhibits typical input resistance of 130 kΩ that users
3MON
should take into account for loading effect.
The MR input has an internal resistor pull-up toV
RESET output is push-pull, between V
t
RS_HOLD*
t
RS_DELAY
, RESET Timing Diagrams
3MON
Rev. A | Page 15 of 36
HYSTERESIS
UV
COMPARATOR
UV
INACTIVE
COMPARATOR
INACTIVE
Figure 9. V
Hysteresis
3MON
). The reset hold time
RS_HOLD
has elapsed. This allows
RS_HOLD
Table 6
and the programming
Table 7
. The range of
Table 8
and the programming code
Table 9
.
and GND.
3MON
t
RS_DELAY
AD5100
goes
3MON
Figure 10
.
. The
3MON
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