参数资料
型号: ADT7468ARQ
厂商: ON Semiconductor
文件页数: 22/81页
文件大小: 0K
描述: IC REMOTE THERMAL CTRLR 24-QSOP
产品变化通告: MFG CHG Notification ADI to ON Semi
Product Obsolescence 11/Feb/2009
标准包装: 56
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: 管件
ADT7468
LIMITS, STATUS REGISTERS, AND INTERRUPTS
LIMIT VALUES
Each measurement channel on the ADT7468 is associated with
high and low limits. These can form the basis of system status
monitoring; a status bit can be set for any out-of-limit condition
and detected by polling the device. Alternatively, SMBALERT
interrupts can be generated to flag a processor or micro-
controller of out-of-limit conditions.
8-Bit Limits
The following is a list of 8-bit limits on the ADT7468.
Voltage Limit Registers
Reg. 0x44, 2.5 V low limit = 0x00 default, Register 0x44 2.5 V
low limit = 0x00 default
Reg. 0x45, 2.5 V high limit = 0xFF default
Reg. 0x46, V CCP low limit = 0x00 default
Reg. 0x47, V CCP high limit = 0xFF default
Reg. 0x48, V CC low limit = 0x00 default
Reg. 0x49, V CC high limit = 0xFF default
Reg. 0x4A, 5 V low limit = 0x00 default
Reg. 0x4B, 5 V high limit = 0xFF default
Reg. 0x4C, 12 V low limit = 0x00 default
Reg. 0x4D, 12 V high limit = 0xFF default
Reg. 0x46, V CCP low limit = 0x00 default
Reg. 0x47, V CCP high limit = 0xFF default
Reg. 0x48, V CC low limit = 0x00 default
Reg. 0x49, V CC high limit = 0xFF default
Temperature Limit Registers
Reg. 0x4E, Remote 1 temperature low limit = 0x01 default
Reg. 0x4F, Remote 1 temperature high limit = 0x7F default
Reg. 0x6A, Remote 1 THERM limit = 0x64 default
Reg. 0x50, local temperature low limit = 0x01 default
Reg. 0x51, local temperature high limit = 0x7F default
Reg. 0x6B, local THERM limit = 0x64 default
Reg. 0x52, Remote 2 temperature low limit = 0x01 default
Reg. 0x53, Remote 2 Temperature high limi t = 0x7F default
Reg. 0x6C, Remote 2 THERM limit = 0x64 default
THERM Limit Register
Reg. 0x7A, THERM limit = 0x00 default
16-Bit Limits
The fan TACH measurements are 16-bit results. The fan TACH
limits are also 16 bits, consisting of a high byte and low byte.
Because slow or stalled fans are normally the only conditions of
interest, only high limits exist for fan TACHs. Because the fan
TACH period is measured, exceeding the limit indicates a slow
or stalled fan.
Fan Limit Registers
Reg. 0x54, TACH1 minimum low byte = 0x00 default
Reg. 0x55, TACH1 minimum high byte = 0x00 default
Reg. 0x56, TACH2 minimum low byte = 0x00 default
Reg. 0x57, TACH2 minimum high byte = 0x00 default
Reg. 0x58, TACH3 minimum low byte = 0x00 default
Reg. 0x59, TACH3 minimum high byte = 0x00 default
Reg. 0x5A, TACH4 minimum low byte = 0x00 default
Reg. 0x5B, TACH4 minimum high byte = 0x00 default
Out-of-Limit Comparisons
Once all limits have been programmed, the ADT7468 can be
enabled for monitoring. The ADT7468 measures all voltage and
temperature measurements in a round-robin format and sets
the appropriate status bit for out-of-limit conditions. TACH
measurements are not part of this round-robin cycle. Compari-
sons are done differently depending on whether the measured
value is compared to a high or low limit.
High limit: > comparison performed
Low limit: ≤ comparison performed
Voltage and temperature channels use a window comparator for
error detecting and therefore have high and low limits. Fan
speed measurements use only a low limit, which is needed only
in manual fan control mode.
Analog Monitoring Cycle Time
The analog monitoring cycle begins when a 1 is written to the
start bit (Bit 0) of Configuration Register 1 (Reg. 0x40). By
default, the ADT7463 powers up with this bit set. The ADC
measures each analog input and as each measurement is
completed, the result is automatically stored in the appropriate
value register. This round-robin monitoring cycle continues
unless disabled by writing a 0 to Bit 0 of Configuration
Register 1.
Since the ADC normally runs freely in this manner, the time
taken to monitor all the analog inputs is usually not of interest,
because the most recently measured value of any input can be
read at any time.
Rev. 3 | Page 22 of 81 | www.onsemi.com
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