ADM1033ARQZ-REEL7 ON Semiconductor, ADM1033ARQZ-REEL7 Datasheet - Page 28

• Manufacturer Part Number: ADM1033ARQZ-REEL7
• Description: IC THERM/FAN SPEED CTRLR 16-QSOP
• Manufacturer: ON Semiconductor

Specifications of ADM1033ARQZ-REEL7

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 34. Register 0x02, Configuration Register 2, Power−On Default 0x84, Lock = Y, S/W Reset = Y
Table 35. Register 0x03, Configuration Register 3, Power−On Default 0x04, Lock = Y, S/W Reset = Y
Table 36. Register 0x04, Configuration Register 4, Power−On Default 0x00, Lock = Y, S/W Reset = Y
<5:4>
<7:4>
<3:0>
<6:4>
Bit
Bit
Bit
7
6
3
2
1
0
7
3
2
1
0
Round Robin
Reserved
Channel Selector
Reserved
Discrete/Linear Speed
Boost Disable
SW Reset
Reserved
#Poles Fan
FAN_FAULT/REF
THERM % Time Window
XOR Test
Reserved
Enable Remote 1 THERM
Events
Enable Local THERM
Events
Name
Name
Name
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
This bit enables the round−robin mode. Set this bit to 0 to put the ADM1033 in
single−channel mode. The ADC converts on one channel only, which is determined by
the channel selector bits. Default = Round Robin = 1.
Reserved.
This bit determines the channel on which the ADC converts.
00 = Local Channel Only
01 = Remote 1 Channel Only
10 = Reserved
11 = Reserved
Reserved.
This bit determines whether the fans run at discrete speeds or at speeds that increase
with temperature between the two thresholds. Default = 1 = Linear.
Set bit to 1 to prevent the fans from being boosted if either THERM temperature or
THERM timer limits are exceeded. Under these conditions, the fan runs at the
previously calculated speed. Default = 0.
Set this bit to 1 to reset the ADM1033 registers to their default values, excluding the limit
registers, offset registers, and Look−up table registers. This bit self−clears. Default = 0.
Reserved.
Write the number of poles in Fan to this register. power−on default = 4 poles = 100. This
should always be an even number, because there cannot be an odd number of poles in
a fan.
This bit sets the function for Pin 8. 0 = Default = FAN_FAULT output (THERM input
is CMOS). 1 = Reference input for THERM.
These bits set the time window over which THERM % is calculated.
000 = 0.25 second
001 = 0.5 second
010 = 1 second
011 = 2 seconds
100 = 4 seconds
101 = 8 seconds
110 = 8 seconds
111 = 8 seconds
Set this bit to 1 to enable the XOR connectivity test.
Reserved.
This bit enables THERM assertions as an output. Functions when the THERM timer
is enabled and the Remote 1 temperature exceeeds its THERM limit.
This bit enables THERM assertions as an output. Functions when the THERM timer
is enabled and the local temperature exceeeds its THERM limit.
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