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ADT7475
When Bit 7 of Configuration Register 6 (0x10) is set, the
default round-robin cycle time increases to 240 ms.
THERM LIMIT
Table 18. CONVERSION TIME WITH AVERAGING
ENABLED
TEMPERATURE
HYSTERESIS ( ° C)
Channel
Voltage Channels
Measurement Time (ms)
11
FANS
100%
Remote Temperature 1
Remote Temperature 2
Local Temperature
39
39
12
Figure 23. THERM Temperature Limit Operation
THERM can be disabled on specific temperature channels
using Bits <7:5> of Configuration Register 5 (0x7C).
Single-channel ADC Conversions
Setting Bit 6 of Configuration Register 2 (0x73) places
the ADT7475 into single-channel ADC conversion mode. In
this mode, the ADT7475 can be made to read a single
temperature channel only. The appropriate ADC channel is
selected by writing to Bits <7:5> of the TACH1 minimum
high byte register (0x55).
Table 19. PROGRAMMING SINGLE-CHANNEL ADC
MODE FOR TEMPERATURES
Register 0x55, Bits <7:5> Channel Selected
101 Remote 1 Temperature
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.
Limits, Status Registers, and Interrupts
Limit Values
Associated with each measurement channel on the
ADT7475 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 detected by polling the device.
110
111
Local Temperature
Remote 2 Temperature
Alternatively, SMBALERT interrupts can be generated to flag
out-of-limit conditions to a processor or microcontroller.
Configuration Register 2 (0x73)
Bit <4> = 1, Averaging off
Bit <6> = 1, Single-channel Convert Mode
8-bit Limits
The following is a list of 8-bit limits on the ADT7475.
Table 20. VOLTAGE LIMIT REGISTERS
TACH1 Minimum High Byte Register ( 0x55)
Bits <7:5> select the ADC channel for single-channel
convert mode.
Overtemperature Events
Overtemperature events on any of the temperature
Register
0x46
0x47
0x48
0x49
Description
V CCP Low Limit
V CCP High Limit
V CC Low Limit
V CC High Limit
Default
0x00
0xFF
0x00
0xFF
channels can be detected and dealt with automatically in
automatic fan speed control mode. Register 0x6A to
Register 0x6C are the THERM temperature limit registers.
When a temperature exceeds its THERM temperature limit,
Table 21. TEMPERATURE LIMIT REGISTERS
Register Description
0x4E Remote 1 Temperature Low Limit
Default
0x81
all PWM outputs run at the maximum PWM duty cycle
(Register 0x38, Register 0x39, and Register 0x3A).
This effectively runs the fans at the fastest allowed speed.
The fans run at this speed until the temperature drops
below THERM minus hysteresis. This can be disabled by
setting the boost bit in Configuration Register 3 (0x78),
Bit 2. The hysteresis value for the THERM temperature
limit is the value programmed into Register 0x6D and
Register 0x6E (hysteresis registers). The default hysteresis
0x4F
0x6A
0x50
0x51
0x6B
0x52
0x53
0x6C
Remote 1 Temperature High Limit
Remote 1 THERM Temp. Limit
Local Temperature Low Limit
Local Temperature High Limit
Local THERM Temperature Limit
Remote 2 Temperature Low Limit
Remote 2 Temperature High Limit
Remote 2 THERM Temp. Limit
0x7F
0x64
0x81
0x7F
0x64
0x81
0x7F
0x64
value is 4 ° C.
Table 22. THERM LIMIT REGISTERS
Register
0x7A
http://onsemi.com
16
Description
THERM Timer Limit
Default
0x00
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