AD5100EVAL datasheet(13/32 Pages) AD

13 / 32 page

Preliminary Technical Data

AD5100

Rev. PrJ | Page 13 of 32

V3MON

V3MON is a low-voltage monitoring input that controls the

RESET function of an external device. V3MON monitors inputs

from 2.5V to 5.5V. It has an 8-step programmable reset

threshold with an 8-step 0.1ms-200ms reset hold time. The

reset hold time means that the reset of the external device is

held until the programmed-time is reached. The V3MON and

reset timing diagrams are shown in Figure 8. The range of

thresholds is shown in Table 5a and the programming code of

the selected-threshold is found in Table 5b. The defaulted

monitoring threshold is 4.36V. Similarly, the range of reset

hold time is shown in Tables 6a and the programming code

of the selected-timing is found in Table 6b. The defaulted

reset hold time is 200ms.

3MON

GLITCH

RS_HOLD*

RESET

3MON

RS_HOLD*

RS_DELAY

* Programmable

3MON

GLITCH

RS_HOLD*

RESET

3MON

RS_HOLD*

RS_DELAY

* Programmable

Figure 8. V3MON

RESET Timing Diagrams

The V3MON pin is monitored by a comparator to detect an

under-voltage condition. It is designed with 1.5% hysteresis.

When the V3MON input drops below the programmed UV

threshold, the comparator will become active immediately,

indicating 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 will be in-active,

indicating the UV condition has gone away, see Figure 9.

The V3MON comparator is used (in conjunction with a hold

timer) to control the RESET pin.

V3MON exhibits typical input resistance of 50KΩ that users

should account the loading effect.

The MR input has an internal resistor pull-up toV3MON. The

RESET output are push-pull configured between V3MON and

GND.

3MON

3MON_UV

Hysteresis

Comparator

In-Active

Comparator

In-Active

3MON

3MON_UV

Hysteresis

Comparator

In-Active

Comparator

In-Active

Figure 9. V3MON Hysteresis.

The default V3MON threshold is 4.36V. User should refer to

Table 5b if they want to program different setting.

V4MON

V4MON is the lowest voltage monitoring input that controls the

RESET function of an external device or provides a

comparator output, V4OUT. V4MON monitors input from 0.9V to

3.3V. It has an 8-step programmable reset threshold with an

8-step 0.1ms to 200ms reset hold time. The V4MON, reset, and

V4OUT timing diagrams are shown in Figure 10. The range of

thresholds is shown in Table 5a and the programming code of

the selected-threshold is found in Tables 5b. The defaulted

monitoring threshold is Disabled. Similarly, the range of

reset hold time is shown in Tables 6a and the programming

code of the selected-timing is found in Table 6b.

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