EVAL-AD5100EBZ View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
EVAL-AD5100EBZ
Analog Devices
'EVAL-AD5100EBZ' PDF : 36 Pages View PDF
AD5100
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.
V2MON_OFF is ignored if V2MON_OFF is greater than V2MON_ON but
V2MON_OFF cannot equal V2MON_ON.
If V2MON is selected with rising edge triggered wake-up mode,
only the on threshold is monitored and the off threshold
is ignored. V2MON is put into rising edge triggered mode by
setting V2MON off threshold, Register 0x04[3:0] to 1001
The voltage at V1MON provides the power for the AD5100, but a
valid signal on V2MON must be present before the internal VREG
starts operating. Details are explained in the Power Requirements
section.
V2MON exhibits typical input resistance of 675 kΩ that users
should take into account for loading effect.
V3MON
V3MON is a low voltage monitoring input that controls the
RESET function of an external device.
The V3MON pin is monitored by a comparator to detect an
undervoltage condition. It is designed with 1.5% hysteresis.
When the V3MON input drops below the programmed UV
threshold, the comparator becomes active immediately, indi-
cating that a UV condition has occurred. Due to hysteresis,
the V3MON input must be brought above the programmed UV
threshold by 1.5% before the comparator becomes inactive,
indicating that the UV condition has gone away (see Figure 9).
V3MON
V3MON_UV
HYSTERESIS
UV
COMPARATOR
INACTIVE
UV
COMPARATOR
INACTIVE
Figure 9. V3MON Hysteresis
The V3MON comparator is used (in conjunction with a hold
timer) to control the RESET pin.
V3MON monitors inputs from 2.0 V to 5.5 V. It has an 8-step
programmable reset threshold (Register 0x05) with an 8-step
0.1 ms to 200 ms reset hold time (tRS_HOLD). The reset hold time
means that the RESET output remains activate when V3MON goes
above its UV threshold, until tRS_HOLD has elapsed. This allows
the reset of an external device to be held until the programmed
time is reached.
The V3MON and RESET timing diagrams are shown in Figure 10.
The range of thresholds is shown in Table 6 and the programming
code for the selected threshold is found in Table 7. The range of
reset hold times is shown in Table 8 and the programming code
of the selected timing is found in Table 9.
V3MON exhibits typical input resistance of 130 kΩ that users
should take into account for loading effect.
The MR input has an internal resistor pull-up toV3MON. The
RESET output is push-pull, between V3MON and GND.
V3MON
V3MON
tRS_HOLD*
tGLITCH
tRS_DELAY
tRS_HOLD*
tRS_DELAY
RESET
NOTES
1. * = PROGRAMMABLE
Figure 10. V3MON, RESET Timing Diagrams
Rev. A | Page 15 of 36
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