MAX6660AEE+ Maxim Integrated Products, MAX6660AEE+ Datasheet - Page 17

• Manufacturer Part Number: MAX6660AEE+
• Description: IC REG FAN SPEED 16-QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX6660AEE+

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Fan Control, Multiplexer, Register Bank
• Sensor Type: External
• Sensing Temperature: External Sensor
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Full Temp Accuracy: +/- 5 C
• Digital Output - Bus Interface: Serial (2-Wire)
• Digital Output - Number Of Bits: 10 bit + Sign
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 12. Fan Count Divisor Register (RFCD/WFCD)
Notes: This byte sets the prescalar division ratio for tachometer or current-sense feedback. (This register does not apply to the tach
Figure 7. MAX6660 Fan Loop Functional Diagram
REGISTER/
COMMAND
ADDRESS
POR State
signal used in the Fan-Speed register). Select this value such that the fan frequency (RPM/60 x number of poles) divided by
the FCD falls in the 33Hz to 66Hz range. See TACH IN section.
Bits 1, 0: 00 = divide by 1, 01 = divide by 2, 10 = divide by 4, 11 = divide by 8.
Bit
Fan-Speed Regulator with SMBus Interface
Remote-Junction Temperature-Controlled
______________________________________________________________________________________
REF FREQUENCY
8415Hz
TACH IN
7
0
1/2/4/8
FCD
127/255
FS
6
0
UP/DOWN
TEMPDATA
4/5/6
1/64
DAC
FG
5
0
READ LIMIT/FAILURE REGISTER
FCD (1Dh = READ, 1Eh = WRITE)
DRIVER
FAN OPEN/CLOSED
4
0
COUNTER
LOOP
FTC
3
0
N
COMPARATOR
FAN FAIL
FTCL
FAN
2
0
VFAN
1
0
0
1
17