EVAL-AD5100EBZ View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
EVAL-AD5100EBZ
Analog Devices
'EVAL-AD5100EBZ' PDF : 36 Pages View PDF
AD5100
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 Outputs section.
The WDI (watchdog) and MR (manual reset) inputs also
control the RESET output, for use with an external digital
processor. Figure 5 shows the general flow chart and Table 10
summarizes the AD5100 functions and features.
V1MON > UV
YES
V1MON < OV
YES
V2MON
LEVEL
SENSITIVE
SELECTED
NO
SHDN = 0*
NO
SHDN = 0*
(V2MON RISING EDGE
NO SENSITIVE SELECTED)
YES
NO
V2MON > ON
SHDN = 0
YES
NO
V2MON > OFF
SHDN = 0
YES
SHDN = 1
MR = 1
YES
NO
RESET = 0
FLOATING NO
WDI DISABLED
YES
STANDARD NO (ADVANCE WDI SELECTED)
WDI SELECTED
YES
VALID WDI
NO
RESET = 0
VALID WDI
YES
YES
NO
FLOATING WDI
YES
RESET = 0
NO
RESET = 0
SHDN = 0
V3MON >
THRESHOLD
NO
RESET = 0
YES
USING V4OUT NO
FOR PWM
YES
V4MON >
THRESHOLD
NO
RESET = 0
YES
V4MON >
THRESHOLD
NO
V4OUT = 0
V4OUT = 1 YES
Table 10. AD5100 Functions and Features
Monitoring
Input Range
Shutdown Reset
Control Control
V1MON 6 V to 28.29 V Yes
Yes
V2MON 3 V to 24.75 V Yes
Yes
V3MON 2.32 V to 4.97 V No
Yes
V4MON 1.67 V to 7.96 V No
Yes
WDI 0 V to 5 V
Yes
Yes
MR 0 V to 5 V
Yes
Yes
CONTINUE
MONITORING
DEFAULT PATHS
* SEE TABLE 11 RESET CONFIGURATION REGISTER:
IF [0] = 0, THEN SHDN = 0 AND RESET = 0
IF [0] = 1, THEN SHDN = 0 AND RESET = 1
Figure 5. General Flow Chart
Fault
Detection
Yes
Yes
Yes
Functions and Features
Overvoltage/undervoltage thresholds
On/off voltage thresholds; pseudo rising edge
triggered, wake-up selectable; MOST wake-up
signal (V2MON connected to V4MON)
Yes
Additional output
No
Standard, advance, or floating; watchdog
selectable
No
Highest priority on RESET over other inputs
If Not Used
Does not apply
Connect to V1MON,
minimum input 6 V
Connect to VOTP and
set threshold to
minimum
Connect to GND
Leave floating
Leave floating
Rev. A | Page 12 of 36
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