MAX6664AEE+ Maxim Integrated Products, MAX6664AEE+ Datasheet - Page 18

• Manufacturer Part Number: MAX6664AEE+
• Description: IC TEMP MON FAN CNTRL 16-QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX6664AEE+

• Function: Fan Control, Temp Monitor
• Topology: ADC, Multiplexer, Register Bank, Tachometer
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, 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: +/- 1 C
• Digital Output - Bus Interface: Serial (2-Wire)
• Digital Output - Number Of Bits: 11 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Temperature Monitors and
PWM Fan Controllers
18
Addr(H)
20
22
______________________________________________________________________________________
READ/WRITE POR STATE
R/W
R/W
0101 1101
MAX6653/
01010101
01011111
MAX6664
MAX6663
Fan characteristics register:
Bits [7:6]: N factor:
Bits [5:3]: PWM frequency:
Bits [2:0]: Spin-up:
Fan-speed configuration register:
Bits [7:4]: Unused.
Bits [3:0]: PWM duty cycle: These bits contain the PWM duty cycle for the PWM duty
1001 = 60% output
1010 = 67% output
1011 = 73% output
1100 = 80% output
1101 = 87% output
1110 = 93% output
1111 =100% output
These bits contain the nominal PWM output frequency:
000 = 11.7Hz
001 = 15.6Hz
010 = 23.4Hz
011 = 31.25Hz (default)
100 = 37.5Hz
101 = 46.9Hz
110 = 62.5Hz
111 = 93.5Hz
cycle fan-control mode. They also contain the minimum duty cycle that is
applied to the fan:
0000 = 0% output
0001 = 7% output
0010 = 14% output
0011 = 20% output
0100 = 27% output
0101 = 33% output (default)
0110 = 40% output
0111 = 47% output
1000 = 53% output
These bits contain the N factor for the fan-speed range:
00 = 1 (fail speed =2647RPM)
01 = 2 (fail speed =1324RPM) (default)
10 = 4 (fail speed = 662RPM)
11 = 8 (fail speed = 331RPM)
These bits contain the fan spin-up time:
000 = 200ms
001 = 400ms
010 = 600ms
011 = 800ms
100 = 1s
101 = 2s (default)
110 = 4s
111 = 8s
Register Summary (continued)
DESCRIPTION