Datasheet

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FUNCTIONAL BLOCK DIAGRAM
AMC6821
THERM
TemperatureThreshold
Registers
Limit
Comparator
Local/Remote
TemperatureRegisters
THERM
Control
OVR
Remote
Sensing
Transistor
mP
ADC
Ref
Mux
On-ChipDiode
TemperatureSensor
CurrentSource
(I ;I )
1 0
IN+
IN-
V
DD
GND A0 A1
SMBus/I C
Interface
2
SCLK
SDA
FAN-FAULT
SMBALERT
ChipRegisters
ControlLogic
TACHData
SignalConditioning
FanSpeedCounter
PWM
Control
AutomaticFanSpeed
Controller
+V
+5V
TACH
PWMOutput
PWM-MODE
AMC6821
SBAS386C – MAY 2006 – REVISED JULY 2007
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