AMC6821SDBQG4 Datasheet, PDF (11/56 Pages) Texas Instruments – Intelligent Temperature Monitor and PWM Fan Controller

AMC6821
www.ti.com
THERM
OVR
Remote
Sensing
Transistor _IN+
IN-
mP
FUNCTIONAL BLOCK DIAGRAM
SBAS386C – MAY 2006 – REVISED JULY 2007
V_DD
GND
AMC6821
THERM
Control
Temperature Threshold
Registers
Limit
Comparator
A0 A1
2
SMBus/I C
Interface
Chip Registers
Control Logic
SCLK
SDA
FAN-FAULT
SMBALERT
Local/Remote
Temperature Registers
TACH Data
+V
ADC
On-Chip Diode
Temperature Sensor
Ref
Current Source
(I₁; I₀)
Signal Conditioning
Fan Speed Counter
TACH
PWM ^{PWM Output}
+5V
Control
Automatic Fan Speed
Controller
PWM-MODE
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