MAX6664AEE+ Maxim Integrated Products, MAX6664AEE+ Datasheet - Page 9

• 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

At the end of each conversion cycle, the converted
temperature data are compared to various set-point
thresholds to control the INT, THERM, SDL, and SDR
outputs. All temperature threshold limits are stored in
the threshold limit registers (Table 6) and can be
changed through the SMBus digital interface.
Table 4. Temperature Data Low Byte Format Structure: LLLXXRRR*
*Where: LLL = local fractional temperature bits, XX = don’t care, RRR = remote fractional temperature bits.
Table 5. Temperature Conversion Rate Setting (Fan Filter Register (23h)—POR = 111)
Table 6. Threshold Limit Registers
LTHER
RTHER
NAME
RTSD
LTSD
RTH
LTH
RTL
FRACTIONAL TEMPERATURE (°C)
LTL
BIT 4
0
0
0
0
1
1
1
1
ADDRESS
1Ah
1Bh
1Ch
14h
15h
16h
18h
19h
0.000
0.125
0.375
0.625
0.875
0.25
0.75
0.5
_______________________________________________________________________________________
BIT 3
Temperature Comparison
0
0
1
1
0
0
1
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
and Interrupt System
Set by CRIT0 and CRIT1
Set by CRIT0 and CRIT1
Set by CRIT0 and CRIT1
Set by CRIT0 and CRIT1
Set by CRIT0 and CRIT1
Set by CRIT0 and CRIT1
Set by CRIT0 and CRIT1
Set by CRIT0 and CRIT1
MAX6653 POR VALUE
BIT2
0
1
0
1
0
1
0
1
DIGITAL OUTPUT (LOCAL)
Temperature Monitors and
CONVERSION RATE (Hz)
000X XXXX
001X XXXX
010X XXXX
011X XXXX
100X XXXX
101X XXXX
110X XXXX
111X XXXX
MAX6663/MAX6664 POR STATE
THERM is an active-low thermal-overload output indicat-
ing that the THERM overtemperature set point is exceed-
ed. With the THERM threshold set to an appropriate value,
the THERM output can be used to control clock throttling.
When this pin is pulled low by an external signal, a status
bit (bit 7, status register 2) is set, and the fan speed is
unconditionally forced to full-on speed. The only way to
reset the status bit is to read status register 2. Connect a
10kΩ pullup resistor between THERM and V
0.0625
0.125
0.25
0.5
1
2
4
4
PWM Fan Controllers
0011 1100
0000 0000
0100 0110
0101 0000
0000 0000
0110 0100
N/A
N/A
DIGITAL OUTPUT (REMOTE)
CONVERSION TIME (s)
Remote temp shutdown limit
Remote temp THERM limit
Local temp shutdown limit
XXX XX 000
XXX XX 001
XXX XX 010
XXX XX 011
XXX XX 100
XXX XX 101
XXX XX 110
XXX XX 111
Local temp THERM limit
Remote temp high limit
Remote temp low limit
Local temp high limit
Local temp low limit
(MAX6653 only)
(MAX6653 only)
DESCRIPTION
0.25
0.25
0.5
16
8
4
2
1
CC
.
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