参数资料
| 型号： | ADT7468ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 74/81页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADT7468 |
| 标准包装： | 1 |
| 其它名称： | EVAL-ADT7468EB EVAL-ADT7468EB-ND |
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ADT7468
Table 40. THERM Limit Registers 1
Register Address
0x6A
0x6B
0x6C
R/W 2
Read/write
Read/write
Read/write
Description
Remote 1 THERM limit.
Local THERM limit.
Remote 2 THERM limit.
Power-On Default
0x64 (100°C)
0x64 (100°C)
0x64 (100°C)
1
2
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 software or hardware locks up. If set to 0x80, this feature is
disabled. The PWM output remains at 100% until the temperature drops below 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.
These registers become read-only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to these registers have no effect.
Table 41. Temperature/T MIN Hysteresis Registers 1
Register Address
0x6D
<3:0>
R/W 2
Read/write
HYSL
Description
Remote 1 and local temperature hysteresis.
Local temperature hyseresis. 0°C to 15°C of
Power-On Default
0x44
hysteresis can be applied to the local temperature
AFC and dynamic T MIN control loops.
<7:4>
HYSR1
Remote 1 temperature hyseresis. 0°C to 15°C of
hysteresis can be applied to the Remote 1
temperature AFC and dynamic T MIN control loops.
0x6E
<7:4>
Read/write
HYSR2
Remote 2 temperature hysteresis.
Local temperature hyseresis. 0°C to 15°C of
0x40
hysteresis can be applied to the local temperature
AFC and dynamic T MIN control loops.
1
2
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 c hannel .
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 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 .
These registers become read-only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to these registers have no effect.
Table 42. XNOR Tree Test Enable
Register Address
0x6F
<0>
R/W 1
Read/write
XEN
Description
XNOR tree test enable register.
If the XEN bit is set to 1, the device enters the XNOR
Power-On Default
0x00
tree test mode. Clearing the bit removes the device
from the XNOR tree test mode.
<7:1>
Reserved
Unused. Do not write to these bits.
1
This register becomes read-only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to this register have no effect.
Table 43. Remote 1 Temperature Offset
Register Address
0x70
<7:0>
R/W 1
Read/write
Read/write
Description
Remote 1 temperature offset.
Allows a twos complement offset value to be
Power-On Default
0x00
automatically added to or subtracted from the
Remote 1 temperature reading. This is to
compensate for any inherent system offsets such as
PCB trace resistance. LSB value = 0.5°C.
1
This register becomes read-only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to this register have no effect.
Rev. 3 | Page 74 of 81 | www.onsemi.com
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