ADM1029

a Dual PWM Fan Controller and Temperature Monitor for High Availability Systems ADM1029* Supports Hot Swapping of Fans Cascadable Fault Output Allows Fault Signaling between Multiple ADM1029s Address Pin Allows Up to Eight ADM1029s in A System Small 24-Lead QSOP Package APPLICATIONS Network Servers and Personal Computers Microprocessor-Based Office Equipment High Availability Telecommunications Equipment FEATURES Software Programmable and Automatic Fan Speed Control Automatic Fan Speed Control Allows Control Independent of CPU Intervention after Initial Setup Control Loop Minimizes Acoustic Noise and Power Consumption Remote and Local Temperature Monitoring Dual Fan Speed Measurement Supports Backup and Redundant Fans FUNCTIONAL BLOCK DIAGRAM VCC SERIAL BUS INTERFACE SCL SDA ADDRESS POINTER REGISTER ADM1029 SLAVE ADDRESS REGISTER INTERRUPT MASK REGISTERS FAN 1 STATUS REGISTER INTERRUPT STATUS REGISTERS INT INTERRUPT MASKING CFAULT PRESENT1 FAULT1 FAN 1 MIN SPEED REGISTER PWM CONTROLLER FAN 1 ALARM SPEED REGISTER FAN 1 HOT-PLUG SPEED REGISTER LIMIT COMPARATOR DRIVE1 VALUE AND LIMIT REGISTERS RESET GPIO2 TACH1 TACH2 PRESENT2 FAN SPEED COUNTER FAN 2 STATUS REGISTER FAN 2 MIN SPEED REGISTER ADC DRIVE2 PWM CONTROLLER FAN 2 ALARM SPEED REGISTER BANDGAP REFERENCE BANDGAP TEMP SENSOR ADD ANALOG MUX REMOTE SENSOR SIGNAL CONDITIONING G.P. I/O REGISTER AIN1/GPIO1 AIN0/GPIO0 FAULT2 D2+/GPIO6 D2–/GPIO5 D1+/GPIO4 D1–/GPIO3 TMIN/INSTALL FAN 2 HOT-PLUG SPEED REGISTER GND ...