参数资料
型号: ADT7476AARQZ-R
厂商: ON Semiconductor
文件页数: 45/66页
文件大小: 945K
描述: IC REMOTE THERMAL CTLR 24QSOP
产品变化通告: MFG CHG Notification ADI to ON Semi
QSOP 24ld Pkg (MSL) Change 17/Jun/2010
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 ~ 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:
输出风扇:
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)
其它名称: ADT7476AARQZ-R-ND
ADT7476AARQZ-ROSTR
ADT7476A
http://onsemi.com
45
Fan Sync
When two ADT7476As are used in a system, it is possible
to synchronize them so that one PWM channel from each
device can be effectively ORed together to create a PWM
output that reflects the maximum speed of the two ORed
PWMs. This ORed PWM can in turn be used to drive a
chassis fan.
Standby Mode
The ADT7476A has been specifically designed to
respond to the STBY supply. In computers that support S3
and S5 states, the core voltage of the processor is lowered in
these states. When monitoring THERM
, the THERM
 timer
should be disabled during these states.
When the V
CCP
 voltage drops below the V
CCP
 low limit,
the following occurs:
1. Status Bit 1 (V
CCP
) in Interrupt Status Register 1
is set.
2. SMBALERT
 is generated, if enabled.
3. THERM
 monitoring is disabled. The THERM
timer should hold its value prior to the S3 or S5
state.
Once the core voltage, V
CCP
, goes above the V
CCP
 low
limit, everything is re-enabled and the system resumes
normal operation.
XNOR Tree Test Mode
The ADT7476A includes an XNOR tree test mode. This
mode is useful for in-circuit test equipment at board-level
testing. By applying stimulus to the pins included in the
XNOR tree, it is possible to detect opens, or shorts, on the
system board.
The XNOR tree test is invoked by setting Bit 0 (XEN) of
the XNOR Tree Test Enable Register (0x6F).
Figure 66 shows the signals that are exercised in the
XNOR tree test mode.
Figure 66. XNOR Tree Test
TACH1
TACH2
TACH3
TACH4
PWM2
PWM3
PWM1/XTO
VID4
VID3
VID2
VID1
VID0
Power-On Default
When the ADT7476A is powered up, monitoring is off by
default and the PWM outputs go to 100%. All necessary
registers then need to be configured via the SMBus for the
appropriate functions to operate.
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