參數(shù)資料
型號： ADT7463ARQZ-REEL
廠商： ON Semiconductor
文件頁數(shù)： 22/50頁
文件大?。?/td> 726K
描述： IC REMOTE THERMAL CTRLR 24-QSOP
產(chǎn)品變化通告： MFG CHG Notification ADI to ON Semi
QSOP 24ld Pkg (MSL) Change 17/Jun/2010
標準包裝： 2,500
系列： dBCool®
功能： 風(fēng)扇控制，溫度監(jiān)控器
傳感器類型： 內(nèi)部和外部
感應(yīng)溫度： -40°C ~ 120°C，外部傳感器
精確度： ±1.5°C（最小值）
拓撲： ADC，比較器，風(fēng)扇速度計數(shù)器，多路復(fù)用器，寄存器庫
輸出類型： SMBus?
輸出警報： 無
輸出風(fēng)扇： 是
電源電壓： 3 V ~ 5.5 V
工作溫度： -40°C ~ 120°C
安裝類型： 表面貼裝
封裝/外殼： 24-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 24-QSOP
包裝： 帶卷 (TR)
ADT7463
http://onsemi.com
22
The total number of channels measured is:
" Four Dedicated Supply Voltage Inputs
" 3.3 V
STBY
 or 5 V Supply (V
CC
 Pin)
" Local Temperature
" Two Remote Temperatures
As mentioned previously, the ADC performs roundrobin
conversions   and   takes   11.38 ms   for   each   voltage
measurement, 12 ms for a local temperature reading, and
25.5 ms for each remote temperature reading.
The total monitoring cycle time for averaged voltage and
temperature monitoring is therefore nominally
(
5 11.38
)
) 12
(
2 25.5
)
+ 120 ms
(eq. 2)
Fan TACH measurements are made in parallel and are not
synchronized with the analog measurements in any way.
Status Registers
The results of limit comparisons are stored in Status
Registers 1 and 2. The status register bit for each channel
reflects the status of the last measurement and limit
comparison on that channel. If a measurement is within
limits, the corresponding status register bit is cleared to 0. If
the measurement is outoflimits, the corresponding status
register bit is set to 1.
The state of the various measurement channels may be
polled by reading the status registers over the serial bus. In
Bit 7 (OOL) of Status Register 1 (Reg. 0x41), 1 means that
an outoflimit event has been flagged in Status Register 2.
This means that a user need only read Status Register 2 when
this bit is set. Alternatively, Pin 10 or Pin 22 can be
configured as an SMBALERT
 output. This automatically
notifies the system supervisor of an outoflimit condition.
Reading the status registers clears the appropriate status bit
as long as the error condition that caused the interrupt has
cleared. Status register bits are sticky. Whenever a status
bit gets set, indicating an outoflimit condition, it remains
set even if the event that caused it has gone away (until read).
The only way to clear the status bit is to read the status
register after the event has gone away. Interrupt status mask
registers (Reg. 0x74, 0x75) allow individual interrupt
sources to be masked from causing an SMBALERT
.
However, if one of these masked interrupt sources goes
outoflimit, its associated status bit gets set in the interrupt
status registers.
Figure 32. Status Register 1
OOL = 1 DENOTES A PARAMETER
MONITORED THROUGH STATUS REG 2
IS OUTOFLIMIT
Table 27. STATUS REGISTER 1 (REG. 0X41)
Bit
Mnemonic
Description
7
OOL
1: denotes a bit in Status Register 2 is
set and Status Register 2 should be
read.
6
R2T
1: Remote 2 Temperature High or Low
Limit has been exceeded.
5
LT
1: Local Temperature High or Low Limit
has been exceeded.
4
R1T
1: Remote 1 Temperature High or Low
Limit has been exceeded.
3
5V
1: 5 V High or Low Limit has been
exceeded.
2
V
CC
1: V
CC
 High or Low Limit has been
exceeded.
1
V
CCP
1: V
CCP
 High or Low Limit has been
exceeded.
0
2.5V
1: 2.5 V High or Low Limit has been
exceeded.
Figure 33. Status Register 2
F4P = 1, FAN 4 OR THERM
TIMER IS OUTOFLIMIT
Table 28. STATUS REGISTER 2 (REG. 0X42)
Bit
Mnemonic
Description
7
D2
1 indicates an open or short on
D2+/D2 inputs.
6
D1
1 indicates an open or short on
D2+/D2 inputs.
5
F4P
1 indicates that Fan 4 has dropped
below minimum speed. Alternatively,
indicates that THERM
 limit has been
exceeded if the THERM
 function is
used.
4
FAN3
1 indicates that Fan 3 has dropped
below minimum speed.
3
FAN2
1 indicates that Fan 2 has dropped
below minimum speed.
2
FAN1
1 indicates that Fan 1 has dropped
below minimum speed.
1
OVT
1 indicates that a THERM
overtemperature limit has been
exceeded.
0
12V/VC
1 indicates that 12 V High or Low Limit
has been exceeded. If the VID code
change function is used, this bit
indicates a change in VID code on the
VID0 to VID5 inputs.
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