6-Channel Intelligent Fan Controller

4

TABLE OF CONTENTS (continued)

MFR_DATE (9Dh) ...........................................................................34

MFR_SERIAL (9Eh) ..........................................................................34

MFR_MODE (D1h)...........................................................................35

MFR_VOUT_PEAK (D4h) .....................................................................36

MFR_TEMPERATURE_PEAK (D6h) .............................................................36

MFR_VOUT_MIN (D7h) .......................................................................36

MFR_FAULT_RESPONSE (D9h) ................................................................36

MFR_NV_FAULT_LOG (DCh) .................................................................. 37

MFR_TIME_COUNT (DDh) ....................................................................40

MFR_TEMP_SENSOR_CONFIG (F0h) ...........................................................40

MFR_FAN_CONFIG (F1h) ..................................................................... 41

MFR_FAN_LUT (F2h) ........................................................................43

TEMPERATURE STEP: Temperature Level Setting..................................................43

FAN SPEED STEP: Fan PWM Duty Cycle or Fan Speed Setting .......................................44

MFR_READ_FAN_PWM (F3h) .................................................................45

MFR_FAN_FAULT_LIMIT (F5h) .................................................................45

MFR_FAN_WARN_LIMIT (F6h).................................................................45

MFR_FAN_RUN_TIME (F7h)...................................................................46

MFR_FAN_PWM_AVG (F8h)...................................................................46

MFR_FAN_PWM2RPM (F9h) ..................................................................46

Applications Information.. .. ... ... .. ... ... .. ... .. ... .. ... ... .. ... ... .. ... .. ... ... ... .. ... .. ... .. 46

Power-Supply Decoupling.....................................................................46

Open-Drain Pins ............................................................................46

Typical Operating Circuit . ... ... .. ... .. ... ... .. ... .. ... ... .. ... ... .. ... .. ... ... .. ... ... .. ... ... . 47

Package Information.. .. ... ... .. ... ... .. ... .. ... .. ... ... .. ... ... .. ... .. ... ... ... .. ... .. ... ... .. 47

Revision History ... ... .. .. ... ... .. ... .. ... .. ... ... .. ... ... .. ... ... ... .. ... .. ... ... .. ... .. ... .. 48

Figure 1. Automatic Fan Control.. .. ... ... .. ... .. ... ... .. ... .. ... ... .. ... ... .. ... .. ... ... ... .. ... . 23

Figure 2. Fan Speed Example .. ... .. ... ... .. ... .. ... .. ... ... .. ... ... .. ... .. ... ... .. ... ... .. ... .. 23

Figure 3. Fan Spin-Up ... ... .. ... ... .. ... .. ... .. ... ... .. ... ... .. ... ... .. ... ... .. ... .. ... ... .. .. 24

Figure 4. Fan PWM to RPM Example.. .. ... ... .. ... ... .. ... .. ... .. ... ... .. ... ... .. ... .. ... ... ... .. 25

Figure 5. MFR_NV_FAULT_LOG .. ... ... .. ... .. ... .. ... ... .. ... .. ... ... .. ... ... .. ... .. ... ... .. ... 37

Figure 6. Fan Lookup Table (LUT) Format .. .. ... ... .. ... ... .. ... .. ... .. ... ... .. ... ... .. ... .. ... ... . 44

LIST OF FIGURES