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| 型号： | ADT7476ARQZ-R7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 58/65页 |
| 文件大小： | 0K |
| 描述： | IC REMOTE THERMAL 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： | ±2.5% |
| 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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ADT7476
Table 69. PWM MINIMUM DUTY CYCLE REGISTERS (Note 1)
Register Address
0x64
0x65
0x66
R/W
R/W
R/W
R/W
Description
PWM1 Minimum Duty Cycle
PWM2 Minimum Duty Cycle
PWM3 Minimum Duty Cycle
Power-On Default
0x80 (50% Duty Cycle)
0x80 (50% Duty Cycle)
0x80 (50% Duty Cycle)
Bit No.
[7:0]
Name
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)
1. These registers become read-only when the ADT7476 is in automatic fan control mode.
Table 70. 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 further attempts to write to these registers have no
effect.
Table 71. THERM LIMIT REGISTERS (Note 1 and 2)
Register Address
0x6A
0x6B
0x6C
R/W
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 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, 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 further attempts to write to these registers have
no effect.
Table 72. TEMPERATURE/T MIN HYSTERESIS REGISTERS (Note 1 and 2)
Register Address
0x6D
[3:0]
[7:4]
0x6E
0x6E
R/W
R/W
HYSL
HYSR1
R/W
HYSR2
Description
Remote 1 and local temperature hysteresis.
Local temperature hysteresis. 0 ° C to 15 ° C of hysteresis can be
applied to the local temperature AFC control loops.
Remote 1 temperature hysteresis. 0 ° C to 15 ° C of hysteresis can
be applied to the Remote 1 temperature AFC control loops.
Remote 2 temperature hysteresis.
Local temperature hysteresis. 0 ° C to 15 ° C of hysteresis can be
applied to the local temperature AFC control loops.
Power-On Default
0x44
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 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 further attempts to write to these registers have
no effect.
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