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ADT7490
Table 20. CONVERSION TIME WITH AVERAGING
DISABLED
Channel Measurement Time (ms)
Voltage Channels 0.7
Remote Temperature 1 7
setting the BOOST bit in Configuration Register 3, Bit 2
(0x78). The hysteresis value for the THERM temperature
limit is the value programmed into the hysteresis registers
(0x6D and 0x6E). The default hysteresis value is 4 ? C.
THERM LIMIT
Remote Temperature 2
Local Temperature
7
1.3
TEMPERATURE
HYSTERESIS ( ? C)
When Bit 7 of Configuration Register 6 (0x10) is set, the
default round-robin cycle time increases to a maximum of
193 ms.
FANS
100%
Table 21. CONVERSION TIME WITH AVERAGING
ENABLED
Figure 29. THERM Temperature Limit Operation
THERM can be disabled by setting Bit 2 of Configuration
Channel
Voltage Channels
Remote Temperature
Local Temperature
Measurement Time (ms)
11
39
12
Register 4 (0x7D). THERM can also be disabled by:
? In Offset 64 mode, writing ? 64 ? C to the appropriate
THERM temperature limit.
? In twos complement mode, writing ? 128 ? C to the
appropriate THERM temperature limit.
Single-channel ADC Conversions
Setting Bit 6 of Configuration Register 2 (Register 0x73)
places the ADT7490 into single-channel ADC conversion
mode. In this mode, the ADT7490 can be made to read a
single temperature channel only. The appropriate ADC
channel is selected by writing to Bits [7:4] of the TACH1
Minimum High Byte register (0x55).
Table 22. PROGRAMMING SINGLE-CHANNEL ADC
MODE FOR TEMPERATURES
Limits, Status Registers, and Interrupts
Limit Values
Associated with each measurement channel on the
ADT7490 are high and low limits. These can form the basis of
system status monitoring; a status bit can be set for any
out-of-limit condition and is detected by polling the device.
Alternatively, SMBALERT interrupts can be generated to flag
out-of-limit conditions to a processor or micro-controller.
Bits [7:4], Register 0x55
Remote 1 Temperature
Local Temperature
Channel Selected
0101
0110
8-bit Limits
The following is a list of 8-bit limits on the ADT7490:
Table 23. VOLTAGE LIMIT REGISTERS
Remote 2 Temperature
0111
Register
Description
Default
Configuration Register 2 (Register 0x73)
Bit 4 (AVG) = 1, Averaging Off.
Bit 6 (CONV) = 1, Single-channel Convert Mode.
Overtemperature Events
Overtemperature events on any of the temperature
channels can be detected and dealt with automatically in
automatic fan speed control mode. Register 0x6A to
Register 0x6C are the THERM temperature limits for the
local and remote diode temperature channels. The
equivalent PECI limit is T CONTROL in Register 0x3D. When
a temperature exceeds its THERM temperature limit, all
PWM outputs run at 100% duty cycle (default). This can be
changed to maximum PWM duty cycle as programmed in
Register 0x38, Register 0x39, and Register 0x3A, by setting
Bit 3 of Register 0x7D.
0x44
0x45
0x46
0x47
0x48
0x49
0x4A
0x4B
0x4C
0x4D
0x84
0x86
0x85
0x87
+2.5 V IN Low Limit
+2.5 V IN High Limit
V CCP Low Limit
V CCP High Limit
V CC Low Limit
V CC High Limit
+5 V IN Low Limit
+5 V IN High Limit
+12 V IN Low Limit
+12 V IN High Limit
V TT Low Limit
V TT High Limit
I MON Low Limit
I MON High Limit
0x00
0xFF
0x00
0xFF
0x00
0xFF
0x00
0xFF
0x00
0xFF
0x00
0xFF
0x00
0xFF
The fans run at this speed until the temperature drops
below THERM minus hysteresis. This can be disabled by
http://onsemi.com
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