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AD5100
BATTERY MONITORING WITH FAN CONTROL
V
can be used with V
4MON
4OUT
control circuit. For example, as shown in Figure 26, when a
temperature sensor output connects to the V
the proper threshold level set, V
temperature goes above the threshold. This turns on the FET
switch, which activates the fan. When V
threshold, V
decreases, which turns off the fan.
4OUT
V
TEMP
V
4OUT
NOTES
1. V
RESET DISABLED.
4MON
in tandem to form a simple PWM
input, with
4MON
outputs high whenever the
4OUT
drops below the
TEMP
BATTERY
V
1MON
V
IGNITION
2MON
AD5100
V
V
3MON
REG
V
V
4MON
TEMP
MR
MR
WDI
WDI
SCL
SDA
CLK
Figure 26. Power Amp Monitoring and Fan Control
Figure 27. V
with Respect to V
4OUT
V
IGNITION
2MON
BATTERY
V
1MON
V
4MON
SCL
SDA
CLK
Figure 28. Battery State of Charge Indication
BATTERY STATE OF CHARGE INDICATOR AND
SHUTDOWN EARLY WARNING MONITORING
In the automotive application, the system designer may set the
battery threshold to the lowest level to allow an automobile to
start at the worst-case condition. If the battery remains at the
low voltage level, it is indeed a poor battery. However, there is
no way to warn the driver. As a result, the system designer can
use V
as the battery warning indicator. By stepping down
4OUT
the battery voltage monitored at V
gives a battery replacement warning. The circuit is shown in
Figure 28.
BATTERY
V
REG
SHDN
SD
V
4OUT
RESET
MICROPROCESSOR
SHDNWARN
CLK
MISO/MOSI
RESET Disabled in Circuit Shown in Figure 26
, with V
TEMP
4MON
SHDN
AD5100
V
4OUT
MICROPROCESSOR
SHDNWARN
CLK
Rev. A | Page 32 of 36
, the LED is lit, which
4MON
TMP35
VTEMP
V
REG
PA
MR
WDI
V
THRESHOLD
4MON
MISO/MOSI
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