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AD5100

Rev. 0 | Page 12 of 36

THEORY OF OPERATION

The AD5100 is a programmable system management IC that

has four channels of monitoring inputs. Three inputs have high

voltage (30 V) capability. For example, if the AD5100 is used in

an automotive application, V1MON (Monitoring Input 1) can be

connected to the battery and the V2MON can be connected to the

ignition switch, a rising edge trigger wake-up signal, or the

media-oriented systems transport (MOST) wake-up signal

(V4MON is connected to V2MON for MOST applications). Two

other inputs, V3MON and V4MON, are designed for low voltage

monitoring, with programmable thresholds from 2.93 V to

7.96 V. The two high voltage monitoring inputs control the

shutdown signal, SHDN and reset signal, RESET, while the two

low voltage monitoring inputs control the reset signal, RESET.

SHDN and RESET are both disabling signals for external devices.

The differences between these two outputs are in output level

and driving capabilities, as described in the

section.

The WDI (watchdog) and

Outputs

MR (manual reset) inputs also

control the RESET output, for use with an external digital

processor.

shows the general flow chart and

summarizes the AD5100 functions and features.

Figure 5

Table 10

YES

SHDN = 0*

SHDN = 0

RESET = 0

YES

SHDN = 0*

V1MON > UV

V1MON < OV

YES

SHDN = 0

SHDN = 1

V2MON > ON

V2MON > OFF

(V2MON RISING EDGE

SENSITIVE SELECTED)

V2MON

LEVEL

SENSITIVE

SELECTED

YES

CONTINUE

MONITORING

YES

V4MON >

THRESHOLD

V4OUT = 0

V4OUT = 1

YES

USING V4OUT

FOR PWM

YES

V4MON >

THRESHOLD

YES

V3MON >

THRESHOLD

YES

VALID WDI

YES

VALID WDI

YES

FLOATING

WDI DISABLED

YES

STANDARD

WDI SELECTED

YES

MR = 1

RESET = 0

YES

FLOATING WDI

NO (ADVANCE WDI SELECTED)

* SEE TABLE 11 RESET CONFIGURATION REGISTER:

IF [0] = 0, THEN SHDN = 0 AND RESET = 0

IF [0] = 1, THEN SHDN = 0 AND RESET = 1

DEFAULT PATHS

Figure 5. General Flow Chart

Table 10. AD5100 Functions and Features

Input

Monitoring

Range

Shutdown

Control

Reset

Control

Fault

Detection

Functions and Features

If Not Used

V1MON

6 V to 28.29 V

Yes

Overvoltage/undervoltage thresholds

Does not apply

V2MON

3 V to 24.75 V

Yes

On/off voltage thresholds; pseudo rising edge

triggered, wake-up selectable; MOST wake-up

signal (V2MON connected to V4MON)

Connect to V1MON,

minimum input 6 V

V3MON

2.32 V to 4.97 V

Yes

Connect to VOTP and

set threshold to

minimum

V4MON

1.67 V to 7.96 V

Yes

Additional output

Connect to GND

WDI

0 V to 5 V

Yes

Standard, advance, or floating; watchdog

selectable

Leave floating

0 V to 5 V

Yes

Highest priority on RESET over other inputs

Leave floating

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