ADM1031ARQ-REEL7 ON Semiconductor, ADM1031ARQ-REEL7 Datasheet - Page 24

• 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 13. Value Registers
Table 14. Register 0y00 Configuration Register 1 Power−On Default = 90H
Address
6−5
Bit
0
1
2
3
4
7
0x0A
0x0B
0x0C
0x0D
0x0E
0x1A
0x1C
0x1D
0x1E
0x06
0x08
0x09
0x0F
0x10
0x14
0x15
0x16
0x18
0x19
0x11
FAN_FAULT Enable
Auto/SW Ctrl
PWM Invert
PWM Mode
INT Enable
MONITOR
TACH/AIN
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
Name
R
R
R
R
Extended Temperature Resolution (see Table 18).
Fan 1 Speed. This register contains the value of the Fan 1 tach measurement.
Fan 2 Speed. This register contains the value of the Fan 2 tach measurement.
Local Temperature Value. This register contains the 8 MSBs of the local temperature measurement.
Remote 1 Temperature Value. This register contains the 8 MSBs of the Remote 1 temperature reading.
Remote 2 Temperature Value. This register contains the 8 MSBs of the Remote 2 temperature reading.
Local Temperature Offset. See Table 27. (Power−On Default = 00h)
Remote 1 Temperature Offset. See Table 28. (Power−On Default = 00h)
Remote 2 Temperature Offset. See Table 29. (Power−On Default = 00h)
Fan 1 Tach High Limit. This register contains the limit for the Fan 1 tach measurement. Because the tach
circuit counts between pulses, a slow fan results in a large measure value, so exceeding the limit is the
way to detect a slow or stalled fan. (Power−On Default = FFh)
Fan 2 Tach High Limit. This register contains the limit for the Fan 2 tach measurement. Because the tach
circuit counts between pulses, a slow fan results in a large measured value, so exceeding the limit is the
way to detect a slow or stalled fan. (Power−On Default = FFh)
Local Temperature High Limit (Power−On Default 60°C)
Local Temperature Low Limit (Power−On Default 0°C)
Local Temperature THERM Limit (Power−On Default 70°C)
Remote 1 Temperature High Limit (Power−On Default 80°C)
Remote 1 Temperature Low Limit (Power−On Default 0°C)
Remote 1 Temperature THERM Limit (Power−On Default 100°C)
Remote 2 Temperature High Limit (Power−On Default 80°C)
Remote 2 Temperature Low Limit (Power−On Default 0°C)
Remote 2 Temperature THERM Limit (Power−On Default 100°C)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Setting this bit to a “1” enables monitoring of temperature and enables measurement
of the fan tach signals. (Powerup Default=0)
Setting this bit to a “1” enables the INT output. 1= Enabled 0= Disabled
(Powerup Default=0)
Clearing this bit to “0” selects digital fan speed measurement via the TACH pins.
Setting this bit to “1” configures the TACH pins as analog inputs that can measure the
speed of 2−wire fans via a sense resistor. (Powerup Default=0)
Setting this bit to “1” inverts the PWM signal on the output pins. (Powerup Default=0)
Logic 1 enables FAN_FAULT pin; Logic 0 disables FAN_FAULT output.
(Powerup Default=1)
These two bits control the behavior of the fans in auto fan speed control mode.
These two bits have the following effect in software control mode.
Logic 1 selects automatic fan speed control; Logic 0 selects SW control. (Powerup
Default = 1). When under software control, PWM duty cycle or RPM values can be
programmed for each fan.
00 = Remote Temp 1 controls Fan 1; Remote Temp 2 controls Fan 2.
01 = Remote Temp 1 controls Fan 1 and Fan 2.
10 = Remote Temp 2 controls Fan 1 and Fan 2.
11 = Max of Local Temp and Remote Temp 1 and 2 drives Fans 1 and 2.
00 = Program PWM duty cycles for Fans 1 and 2.
11 = Program RPM Speeds for Fans 1 and 2.
http://onsemi.com
24
Description
Description