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MAX1669 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX1669 Datasheet(HTML) 6 Page - Maxim Integrated Products |
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Fan Controller and Remote Temperature Sensor with SMBus Serial Interface 6 _______________________________________________________________________________________ Typical Operating Characteristics (continued) (Temperature error = measured - actual, TA = +25°C, unless otherwise noted.) Pin Description 0 20 40 60 80 100 04 2 5 7 8 10 12 3 1 6 9 11 131415 PWM DUTY FACTOR vs. CODE (D3D2D1D0) CODE (D3D2D1D0) VCC = +3.3V OR +5V 0 0.5 1.5 1.0 2.0 3.5 3.0 2.5 4.0 4.5 5.0 04 2 5 7 8 10 12 3 16 9 11 14 13 15 DAC OUTPUT vs. CODE (D3D2D1D0) CODE (D3D2D1D0) ILOAD = +10mA TO -10mA VCC = +5V NAME FUNCTION 1 I/O1 General-Purpose Open-Drain Logic Input/Output 1. I/O1 is intended for driving LEDs, driving power-plane switching MOSFETs, or detecting fan presence or chassis intrusion. 2 I/O2 General-Purpose Open-Drain Logic Input/Output 2. I/O2 is intended for driving LEDs, driving power-plane switching MOSFETs, or detecting fan presence or chassis intrusion. PIN 3 ADD0 SMBus Address Select Pin 0. See Table 11. 4 ADD1 SMBus Address Select Pin 1. See Table 11. 8 DXP Combined Current Source and ADC Positive Input from Remote Diode. Place a 2200pF capacitor between DXP and DXN for noise filtering. 7 DXN Combined Current Sink and ADC Negative Input from Remote Diode. DXN is normally biased to a diode voltage above ground. 6 AGND Analog Ground 5 ADD2 SMBus Address Select Pin 2. See Table 11. 13 SMBCLK SMBus Serial-Clock Input 12 PGND Power Ground 11 FAN Fan-Control Logic Output. Swings from PGND to VCC in PWM mode, or PGND to 0.94 · VCC in DAC mode. 10 SYNC Oscillator Synchronization Input. Connect to AGND to use internal clock. Capture range is 140kHz to 400kHz. The synchronization signal is internally applied to the FAN PWM clock. See Table 5 for synchro- nized frequencies. 9 VCC Supply Voltage Input, +3V to +5.5V. Bypass to AGND with a 0.1µF capacitor. 16 OVERT Active-Low, Open-Drain Thermostat Output. Activated by TCRIT threshold 15 ALERT Active-Low, Open-Drain SMBus Alert (interrupt) Output 14 SMBDATA Open-Drain SMBus Serial-Data Input/Output |
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