MAX6620ATI+ Maxim Integrated Products, MAX6620ATI+ Datasheet - Page 16

• Manufacturer Part Number: MAX6620ATI+
• Description: IC QUAD LIN FAN-SPD CTRLR 28TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX6620ATI+

• Applications: Fan Controller
• Number Of Outputs: 4
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Quad Linear Fan-Speed Controller
16
BIT
7
6
5
4
3
______________________________________________________________________________________
R/W
R/W
R/W
R/W
R/W
R/W
Run:
POR:
This bit automatically resets itself and will always return a 0 when read.
I
The I
Fans to 100% on failure:
Oscillator Selection:
Selects on-chip oscillator or 32.768kHz crystal/ceramic resonator. Use crystal if 1% RPM accuracy is
required.
When switching from the internal oscillator to an external crystal, the MAX6620 operates from the internal
oscillator until the crystal oscillator has started up. If the crystal is damaged or the oscillator fails to start,
the MAX6620 will continue to operate from the internal oscillator.
2
C Bus Timeout:
0 = run
1 = standby
0 = normal operation
1 = reset all registers to POR values
0 = enabled
1 = disabled
0 = if a fan failure is detected, all other fan channels immediately go to full-scale drive voltage to
1 = disabled
0 = internal oscillator (default at power-on)
1 = external 32.768kHz crystal
2
C interface will reset if SDA is low for more than 35ms.
ensure adequate cooling
Global Configuration Register (00h)—POR = 0000 0XXX
FUNCTION
Register Descriptions