参数资料
型号: ADT7468ARQZ-REEL
厂商: ON Semiconductor
文件页数: 73/81页
文件大小: 0K
描述: IC REMOTE THERMAL CTRLR 24QSOP
产品变化通告: MFG CHG Notification ADI to ON Semi
Product Obsolescence 11/Feb/2009
标准包装: 2,500
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 ~ 120°C,外部传感器
精确度: ±2°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:
输出风扇:
电源电压: 3 V ~ 5.5 V
工作温度: -40°C ~ 120°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)
ADT7468
Table 37. Register 0x63 – Enhanced Acoustics Register 2 (Power-On Default = 0x00)
Bit
<2:0>
Name
ACOU3
R/W 1
Read/write
Description
These bits select the ramp rate applied to the PWM3 output. Instead of PWM3 jumping instantaneously to
its newly calculated speed, PWM3 ramps gracefully at the rate determined by these bits. This effect
enhances the acoustics of the fan being driven by the PWM3 output.
Time Slot Increase Time for 33% to 100%
000 = 1 35 sec
001 = 2 17.6 sec
010 = 3 11.8 sec
011 = 5 7 sec
100 = 8 4.4 sec
101 = 12 3 sec
110 = 24 1.6 sec
111 = 48 0.8 sec
<3>
<6:4>
EN3
ACOU2
Read/write
Read/write
When this bit is 1, acoustic enhancement is enabled on PWM3 output.
These bits select the ramp rate applied to the PWM2 output. Instead of PWM2 jumping instantaneously to
its newly calculated speed, PWM2 ramps gracefully at the rate determined by these bits. This effect
enhances the acoustics of the fans being driven by the PWM2 output.
Time Slot Increase Time for 33% to 100%
000 = 1 35 sec
001 = 2 17.6 sec
010 = 3 11.8 sec
011 = 5 7 sec
100 = 8 4.4 sec
101 = 12 3 sec
110 = 24 1.6 sec
<7>
EN2
Read/write
When this bit is 1, acoustic enhancement is enabled on PWM2 output.
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 38. PWM Minimum Duty Cycle Registers
Register Address
0x64
0x65
0x66
R/W 1
Read/write
Read/write
Read/write
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
<7:0>
Name
PWM duty cycle
R/W 1
Read/write
Description
These bits define the PWM MIN duty cycle for PWMx.
These registers become read-only when the ADT7468 is in automatic fan control mode.
0x00 = 0% duty cycle (fan off).
0x40 = 25% duty cycle.
0x80 = 50% duty cycle.
0xFF = 100% duty cycle (fan full speed).
1
Table 39. T MIN Registers 1
Register Address
0x67
0x68
0x69
R/W 2
Read/write
Read/write
Read/write
Description
Remote 1 temperature T MIN .
Local temperatue T MIN .
Remote 2 temperature T MIN .
Power-On Default
0x5A (90°C)
0x5A (90°C)
0x5A (90°C)
1
2
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 .
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.
Rev. 3 | Page 73 of 81 | www.onsemi.com
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