
AD5100
Preliminary Technical Data
THEORY OF OPERATION
Rev. PrJ | Page 10 of 32
The AD5100 is a Programmable System Management IC that
has four channels of monitoring inputs. Two inputs have high
voltage (30V) capability. For example if the AD5100 is used in
the automotive application, the V
1MON
(Monitoring Input 1)
should be the battery and the V
2MON
should either be the
ignition switch or the pseudo CAN bus wake up signal input.
Two other inputs, V
3MON
and V
4MON
, are low voltage for 0.9V,
1.8V, 2.5V, 3.3V, or 5V monitoring. The two high voltage inputs
control the shutdown signal, SHDN , while the two low voltage
inputs control the reset signal, RESET . The SHDN and RESET
are both disabling functions for the external devices. The
differences are output levels and driving capabilities that will be
described later. In some cases the SHDN and RESET may be
used interchangeably. The WDI (Watchdog) and MR (Manual
Reset) inputs also control RESET output for external digital
processor. Figure 4 shows the general flow chart and Table 7
summarizes the AD5100 functions and features.
If [0] = 1, then SHDN =0 and RESET = 1
V
1MON
>UV
yes
No
SHDN=0*
V
1MON
<OV
yes
SHDN=0*
V
2MON
>ON
yes
No
SHDN=0
V
2MON
>OFF
yes
SHDN=0
No
Threshold
yes
No
RESET=0
Threshold
yes
RESET=0
Valid WDI
yes
No
RESET=0
MR=1
yes
RESET=0
No
No
No
Selected
yes
for PWM
yes
No
Threshold
yes
V
4OUT
=0
No
V
4OUT
=1
WDI Selected
yes
No (Advance WDI Selected)
Monitoring
Valid WDI
No
SHDN=0
yes
No (V
2MON
Rising Edge Sensitive Selected)
WDI Disabled
yes
No
Floating WDI
No
RESET=0
yes
Disabled
yes
No
Default Paths
SHDN=1
* See Table 9 RESET Configuration Register:
If [0] = 0, then SHDN =0 and RESET = 0
V
>
V
>
V
Level
Sensitive
Using V
V
>
Standard
Continue
RESET=0
Floating
V
Figure 4. General Flow Chart
Table 7. AD5100 Functions and Features
Input
Monitoring
Range
Shutdown
Control
Reset
Cont
rol
Fault
Dete
ction
√
√
Functions and Features
If Not Used
V
1MON
V
2MON
V
3MON
V
4MON
6 – 30 V
3 – 30 V
2.5 – 5.0 V
0.9 – 3.3 V
√
√
√
√
√
√
√
Over/Under Voltage
On/Off Voltage
CAN Bus Wake Up
Additional Output
Does not apply
Tie to V
1MON
, Min Input
Connect to VOTP and
Threshold to Minimum
√
√
Select Disable in Threshold
WDI
0 – 5 V
√
Standard, Advance, or
Watchdog Selectable
Leave Floating