ADM1031ARQ-REEL7 ON Semiconductor, ADM1031ARQ-REEL7 Datasheet - Page 27

• Manufacturer Part Number: ADM1031ARQ-REEL7
• Description: IC SENSOR 2-TEMP/FAN CTRL 16QSOP
• Manufacturer: ON Semiconductor

Specifications of ADM1031ARQ-REEL7

• Rohs Status: RoHS non-compliant
• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: 0°C ~ 100°C, External Sensor
• Output Type: SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP

Table 21. Register 0y22 Fan Speed Configuration Register Power−On Default = 55H
Table 22. Register 0y23 Fan Filter Register Power−On Default = 50H
Table 23. Register 0y24 Local Temp T
<3:0>
<7:4>
<6:5>
<4:2>
<7:3>
<2:0>
<7>
<1>
<0>
Bit
Bit
Bit
Local Temp T
> Local Temp T
ADC Sample Rate
Normal/Min Spd 1
Normal/Min Spd 2
Spin−Up Disable
Fan 2 Filter En
Fan 1 Filter En
Ramp Rate
Name
Name
Name
RANGE
MIN
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
MIN
/T
This nibble contains the normal speed value for Fan 1. When in automatic fan speed
control mode, this nibble contains the minimum speed at which Fan 1 runs. Default is
0x05 for 33% PWM duty cycle.
This nibble contains the normal speed value for Fan 2. When in automatic fan speed
control mode, this nibble contains the minimum speed at which Fan 2 runs. Default is
0x05 for 33% PWM duty cycle.
When set to 1, disables fan spin−up.
These bits set the ramp rate. (Default = 31 Hz)
These bits set the sampling rate for the ADC.
This bit enables fan filtering for Fan 2.
This bit enables fan filtering for Fan 1.
Contains the minimum temperature value for automatic fan speed control based on
local temperature readings. T
increments. Default is 32°C.
This nibble contains the temperature range value for automatic fan speed control
based on the local temperature readings.
RANGE
00 = 1
01 = 2
10 = 4 (Default)
11 = 8
000 = 87.5 Hz
001 = 175 Hz
010 = 350 Hz
011 = 700 Hz
100 = 1.4 kHz (Default)
101 = 2.8 kHz
110 = 5.6 kHz
111 = 11.2 kHz
00000 = 0°C
00001 = 4°C
00010 = 8°C
00011 = 12°C
01000 = 32°C (Default)
11110 = 120°C
11111 = 124°C
000 = 5°C
001 = 10°C (Default)
010 = 20°C
011 = 40°C
100 = 80°C
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Power−On Default = 41H
27
MIN
can be programmed to positive values only in 4°C
Description
Description
Description