MAX6641AUB94+ Maxim Integrated Products, MAX6641AUB94+ Datasheet - Page 6

• Manufacturer Part Number: MAX6641AUB94+
• Description: IC TEMP MONITOR SMBUS 10UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX6641AUB94+

• Function: Fan Control, Temp Monitor
• Topology: ADC, PWM Generator, Tach Counter
• 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: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Full Temp Accuracy: +/- 4 C
• Digital Output - Bus Interface: Serial (2-Wire)
• Digital Output - Number Of Bits: 8 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SMBus-Compatible Temperature Monitor with
Automatic PWM Fan-Speed Controller
Table 1. Register Functions
6
READ/
WRITE
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R
R
_______________________________________________________________________________________
REGISTER
ADDRESS
0Ah
0Bh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
(96 = 40%)
0000 0000
0000 0000
0000 00xx
0110 1110
0101 0000
0110 000x
1111 000x
0000 000x
0000 000x
0000 0000
00xx xxxx
00xx xxxx
STATE
(240 =
100%)
POR
Fan target duty
Remote-diode
Remote-diode
Fan maximum
instantaneous
Fan-start duty
Configuration
Read remote
FUNCTION/
temperature
temperature
temperature
temperature
temperature
Local-diode
Read local
duty cycle
duty cycle
OT status
(external)
OT mask
(internal)
fan-start
OT limit
OT limit
NAME
cycle
cycle
byte
Fan
= masked
Reserved
set to 0
Remote 1
Remote 1
(128/240)
(128/240)
(128/240)
(128/240)
(+128 C)
(+128 C)
(+128 C)
(+128 C)
(+128 C)
= fault
MSB
MSB
MSB
MSB
MSB
MSB
MSB
MSB
MSB
D7
Reserved
Local 1 =
Local 1 =
(64/240)
(64/240)
(64/240)
(64/240)
(+64 C)
(+64 C)
(+64 C)
(+64 C)
masked
(+64 C)
set to 0
fault
D6
enabled, 1 =
Timeout: 0 =
disabled
(32/240)
(32/240)
(32/240)
(32/240)
(+32 C)
(+32 C)
(+32 C)
(+32 C)
(+32 C)
D5
X
X
(+16 C)
(+16 C)
(+16 C)
(+16 C)
( 16/240)
(+16 C)
( 16/240)
( 16/240)
( 16/240)
invert
PWM
Fan
D4
X
X
start duty
Min duty
0 = 0%,
1 = fan-
(8/240)
(8/240)
(8/240)
(8/240)
(+8 C)
(+8 C)
(+8 C)
(+8 C)
(+8 C)
cycle:
cycle
D3
X
X
Spin-up
disable
(4/240)
(4/240)
(4/240)
(4/240)
(+4 C)
(+4 C)
(+4 C)
(+4 C)
(+4 C)
D2
X
X
(2/240)
(2/240)
(2/240)
(2/240)
(+2 C)
(+2 C)
(+2 C)
(+2 C)
(+2 C)
LSB
LSB
LSB
LSB
D1
X
X
X
(+1 C)
(+1 C)
(+1 C)
(+1 C)
(+1 C)
LSB
LSB
LSB
LSB
LSB
D0
X
X
X
X
X
X
X