参数资料
| 型号： | ADT7475EBZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 52/58页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADT7475 |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 系列： | dBCool® |
| 类型： | 温度传感器 |
| 适用于相关产品： | ADT7475 |
| 所含物品： | 评估板 |
| 其它名称： | EVAL-ADT7475EB EVAL-ADT7475EB-ND |
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ADT7475
Table 67. REGISTER 0X64, REGISTER 0X65, REGISTER 0X66 ? PWM MINIMUM DUTY CYCLE REGISTERS
(POWER-ON DEFAULT = 0X80; 50% DUTY CYCLE)
Bit No.
<7:0>
Mnemonic
PWM Duty
Cycle
R/W
R/W
Description
These bits define the PWM MIN duty cycle for PWMx.
0x00 = 0% Duty Cycle (Fan Off)
0x40 = 25% Duty Cycle
0x80 = 50% Duty Cycle
0xFF = 100% Duty Cycle (Fan Full Speed)
Table 68. T MIN REGISTERS (Note 1 and 2)
Register Address
0x67
0x68
0x69
R/W
R/W
R/W
R/W
Description
Remote 1 Temperature T MIN
Local Temperature T MIN
Remote 2 Temperature T MIN
Power-On Default
0x5A (90 ° C)
0x5A (90 ° C)
0x5A (90 ° C)
1. These are the T MIN registers for each temperature channel. When the temperature measured exceeds T MIN , the appropriate fan runs at
minimum speed and increases with temperature according to T RANGE .
2. These registers become read-only when the Configuration Register 1 Lock bit is set. Any subsequent attempts to write to these registers fail.
Table 69. THERM TEMPERATURE LIMIT REGISTERS (Note 1)
R/W
Register Address
0x6A
0x6B
0x6C
(Note 2)
R/W
R/W
R/W
Description
Remote 1 THERM Temperature Limit
Local THERM Temperature Limit
Remote 2 THERM Temperature Limit
Power-On Default
0x64 (100 ° C)
0x64 (100 ° C)
0x64 (100 ° C)
1. If any temperature measured exceeds its THERM limit, all PWM outputs drive their fans at 100% duty cycle. This is a fail-safe mechanism
incorporated to cool the system in the event of a critical overtemperature. It also ensures some level of cooling in the event that s oftware
or hardware locks up. If set to 0x80, this feature is disabled. The PWM output remains at 100% until the temperature drops below a THERM
Limit ? Hysteresis. If the THERM pin is programmed as an output, then exceeding these limits by 0.25 ° C can cause the THERM pin to assert
low as an output.
2. These registers become read-only when the Configuration Register 1 Lock bit is set to 1. Any subsequent attempts to write to these registers fail.
Table 70. TEMPERATURE/T MIN HYSTERESIS REGISTERS (Note 1)
R/W
Register Address
0x6D
(Note 2)
R/W
Bit Name
Description
Remote 1 and local temperature hysteresis.
Power-On Default
0x44
HYSL
<3:0>
HYSR1
<7:4>
Local temperature hysteresis. 0 ° C to 15 ° C of hysteresis
can be applied to the local temperature and AFC loops.
Remote 1 temperature hysteresis. 0 ° C to 15 ° C of
hysteresis can be applied to the Remote 1 temperature
and AFC loops.
0x6E
R/W
HYSR2
<7:4>
Remote 2 temperature hysteresis.
Local temperature hysteresis. 0 ° C to 15 ° C of hysteresis
can be applied to the local temperature and AFC loops.
0x40
1. Each 4-bit value controls the amount of temperature hysteresis applied to a particular temperature channel. Once the temperature for that
channel falls below its T MIN value, the fan remains running at PWM MIN duty cycle until the temperature = T MIN ? hysteresis. Up to 15 ° C of
hysteresis can be assigned to any temperature channel. The hysteresis value chosen also applies to that temperature channel, if its THERM
limit is exceeded. The PWM output being controlled goes to 100%, if the THERM limit is exceeded and remains at 100% until the temperature
drops below THERM ? hysteresis. For acoustic reasons, it is recommended that the hysteresis value not be programmed to less than 4 ° C.
Setting the hysteresis value lower than 4 ° C causes the fan to switch on and off regularly when the temperature is close to T MIN .
2. These registers become read-only when the Configuration Register 1 Lock bit is set to 1. Any subsequent attempts to write to these registers fail.
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