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AD5100 Datasheet(PDF) 33 Page - Analog Devices

Part # AD5100
Description  System Management IC with Programmable Quad Voltage Monitoring and Supervisory Functions
PDF  36 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD5100 Datasheet(HTML) 33 Page - Analog Devices

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AD5100
Rev. 0 | Page 33 of 36
BATTERY MONITORING WITH FAN CONTROL
V4MON can be used with V4OUT in tandem to form a simple PWM
control circuit. For example, as shown in Figure 28, when a
temperature sensor output connects to the V4MON input, with the
proper threshold level set, V4OUT outputs high whenever the
temperature goes above the threshold. This turns on the FET
switch, which activates the fan. When VTEMP drops below the
threshold, V4OUT decreases, which turns off the fan.
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 V4OUT as the battery warning indicator. By stepping down
the battery voltage monitored at V4MON, the LED is lit, which
gives a battery replacement warning. The circuit is shown in
Figure 30.
AD5100
V2MON
V3MON
V4MON
MR
WDI
SDA
SCL
V1MON
V4OUT
SHDNWARN
SHDN
RESET
WDI
MR
BATTERY
IGNITION
VREG
VTEMP
MR
WDI
CLK
VREG
VREG
BATTERY
SD
MICROPROCESSOR
CLK
MISO/MOSI
PA
TMP35
VTEMP
Figure 28. Power Amp Monitoring and Fan Control
VTEMP
V4OUT
NOTES
1. V4MON RESET DISABLED.
V4MON THRESHOLD
Figure 29. V4OUT with Respect to VTEMP, with V4MON RESET Disabled in Circuit Shown in Figure 28
AD5100
V4MON
SDA
SCL
V4OUT
SHDNWARN
SHDN
V1MON
BATTERY
V2MON
IGNITION
CLK
MICROPROCESSOR
CLK
MISO/MOSI
Figure 30. Battery State of Charge Indication



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