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| 型号： | ADT7490ARQZ-R7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 62/75页 |
| 文件大小： | 0K |
| 描述： | IC THERM MON FAN CTLR 24-QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi QSOP 24ld Pkg (MSL) Change 17/Jun/2010 Product Discontinuation 30/Sept/2011 |
| 标准包装： | 1,000 |
| 系列： | dBCool® |
| 功能： | 风扇控制，温度监控器 |
| 传感器类型： | 内部和外部 |
| 感应温度： | -40°C ~ 125°C |
| 精确度： | ±1.5°C（最小值） |
| 拓扑： | ADC，比较器，风扇速度计数器，多路复用器，寄存器库 |
| 输出类型： | SMBus? |
| 输出警报： | 无 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 带卷 (TR) |
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ADT7490
Table 82. REGISTER 0x6E ? REMOTE 2 AND PECI TEMPERATURE/T MIN HYSTERESIS
(POWER-ON DEFAULT = 0x44)
Bit No.
R/W
(Note 1)
[3:0]
[7:4]
Mnemonic
HYSP
HYSR2
(Note 2)
R/W
R/W
Description
PECI temperature hysteresis. 0 ? C to 15 ? C of hysteresis can be applied to the PECI AFC
control loops.
Remote 2 temperature hysteresis. 0 ? C to 15 ? C of hysteresis can be applied to the local
temperature AFC control loops.
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 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 (0x40) Lock bit is set to 1. Any further attempts to write to these
registers have no effect.
Table 83. REGISTER 0 x6F ? XNOR TREE TEST ENABLE (POWER-ON DEFAULT = 0x00)
Bit No.
[0]
[7:1]
Mnemonic
XEN
RES
R/W (Note 1)
R/W
R/W
Description
If the XEN bit is set to 1, the device enters the XNOR tree test mode. Clearing the bit
removes the device from the XNOR tree test mode.
Unused/reserved. Do not write to these bits.
1. This register becomes read-only when the Configuration Register 1 (0x40) Lock bit is set to 1. Any further attempts to write to this register
have no effect.
Table 84. REGISTER 0x70 ? REMOTE 1 TEMPERATURE OFFSET (POWER-ON DEFAULT = 0x00)
Bit No.
[7:0]
R/W (Note 1)
R/W
Description
Allows a temperature offset to be automatically applied to the Remote 1 temperature channel measurement.
Bit 1 of Configuration Register 5 (0x7C) determines the range and resolution of this register.
1. This register becomes read-only when the Configuration Register 1 (0x40) Lock bit is set to 1. Any further attempts to write to this register
have no effect.
Table 85. REGISTER 0x71 ? LOCAL TEMPERATURE OFFSET (POWER-ON DEFAULT = 0x00)
Bit No.
[7:0]
R/W (Note 1)
R/W
Description
Allows a temperature offset to be automatically applied to the local temperature measurement. Bit 1 of
Configuration Register 5 (0x7C) determines the range and resolution of this register.
1. This register becomes read-only when the Configuration Register 1 (0x40) Lock bit is set to 1. Any further attempts to write to this register
have no effect.
Table 86. REGISTER 0x72 ? REMOTE 2 TEMPERATURE OFFSET (POWER-ON DEFAULT = 0x00)
Bit No.
[7:0]
R/W (Note 1)
R/W
Description
Allows a temperature offset to be automatically applied to the Remote 2 temperature channel measurement.
Bit 1 of Configuration Register 5 (0x7C) determines the range and resolution of this register.
1. This register becomes read-only when the Configuration Register 1 (0x40) Lock bit is set to 1. Any further attempts to write to this register
have no effect.
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