MAX6620ATI+ Maxim Integrated Products, MAX6620ATI+ Datasheet - Page 22

• 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
22
BIT
BIT
BIT
BIT
7
6
5
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
0
______________________________________________________________________________________
R/W
R/W
R/W
R/W
R
R
R
R
R
Fan_ TACH Count D7:D5
Fan_ Drive Voltage D8:D1:
This is a 9-bit value that ranges from 0 to 511.
This register shows the actual fan drive voltage. When the value in this register is 480V, the nominal fan drive
voltage of V
Fan_ TACH Count D10:D3:
Indicates the number of 8192Hz clock pulses counted during the counting period. The Fan_ TACH Count
consists of 11 bits contained in two bytes.
To minimize noise from spurious tachometer transitions, pulses less than 25µs are ignored.
Fan_ Drive Voltage D0
Full-Scale Status:
0 = DAC is driving with value of D8:D0 that is not at full scale
1 = DAC is driving with full scale voltage
Fan_ Drive Voltage Registers (18h, 1Ah, 1Ch, 1Eh)—POR = 0000 0000
Fan_ Drive Voltage Registers (19h, 1Bh, 1Dh, 1Fh)—POR = 0000 0000
FAN
Fan_ TACH Count Registers (10h, 12h, 14h, 16h)—POR = 1111 1111
Fan_ TACH Count Registers (11h, 13h, 15h, 17h)—POR = 1110 0000
is supplied to the fan, as shown in the table in the Fan_ Target Drive Voltage Registers section.
FUNCTION
FUNCTION
FUNCTION
FUNCTION