參數(shù)資料
型號： ADT7476AARQZ-R
廠商： ON Semiconductor
文件頁數(shù)： 22/66頁
文件大?。?/td> 945K
描述： IC REMOTE THERMAL CTLR 24QSOP
產(chǎn)品變化通告： MFG CHG Notification ADI to ON Semi
QSOP 24ld Pkg (MSL) Change 17/Jun/2010
標(biāo)準(zhǔn)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 ~ 125°C
精確度： ±2.5%
拓?fù)洌?/td> 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 ~ 3.6 V
工作溫度： -40°C ~ 125°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)
其它名稱： ADT7476AARQZ-R-ND
ADT7476AARQZ-ROSTR
ADT7476A
http://onsemi.com
22
Table 30. INTERRUPT MASK REGISTER 1 (0x74)
Bit
Mnemonic
Description
[7]
OOL
1 masks SMBALERT
 for any alert
condition flagged in Interrupt Status
Register 2.
[6]
R2T
1 masks SMBALERT
 for Remote 2
temperature.
[5]
LT
1 masks SMBALERT
 for Local
temperature.
[4]
R1T
1 masks SMBALERT
 for Remote 1
temperature.
[3]
5.0 V
1 masks SMBALERT
 for the 5.0 V
channel.
[2]
V
CC
1 masks SMBALERT
 for the V
CC
channel.
[1]
V
CCP
1 masks SMBALERT
 for the V
CCP
channel.
[0]
2.5 V
1 masks SMBALERT
 for the
2.5 V
IN
/THERM
 channel.
Table 31. INTERRUPT MASK REGISTER 2 (0x75)
Bit
Mnemonic
Description
[7]
D2
1 masks SMBALERT
 for Diode 2 errors.
[6]
D1
1 masks SMBALERT
 for Diode 1 errors.
[5]
FAN4
1 masks SMBALERT
 for Fan 4 failure.
If the TACH4 pin is being used as the
THERM
 input, this bit masks
SMBALERT
 for a THERM
 event. If the
TACH4 pin is being used as GPIO6,
setting this bit masks interrupts related
to GPIO6.
[4]
FAN3
1 masks SMBALERT
 for Fan 3.
[3]
FAN2
1 masks SMBALERT
 for Fan 2.
[2]
FAN1
1 masks SMBALERT
 for Fan 1.
[1]
OVT
1 masks SMBALERT
 for
overtemperature (exceeding THERM
limits).
[0]
12 V/VC
1 masks SMBALERT
 for 12 V channel
or for a VID code change, depending on
the function used.
Enabling the SMBALERT
 Interrupt Output
The SMBALERT
  interrupt function is disabled by
default. Pin 10 or Pin 14 can be reconfigured as an
SMBALERT
 output to signal out-of-limit conditions.
Table 32. CONFIGURING PIN 10 AS SMBALERT
OUTPUT
Register
Bit Setting
Configuration Register 3
(0x78)
[1] Pin 10 = SMBALERT
 
[0] Pin 10 = PWM2
Assigning THERM
 Functionality to a Pin
Pin 14 on the ADT7476A has four possible functions:
SMBALERT
, THERM
, GPIO6, and TACH4. The user
chooses the required functionality by setting Bit 0 and Bit 1
of Configuration Register 4 (0x7D).
If THERM
 is enabled on Bit 1, Configuration Register 3
(0x78):
?SPAN class="pst ADT7476AARQZ-R_2298076_5"> Pin 22 becomes THERM
.
?SPAN class="pst ADT7476AARQZ-R_2298076_5"> If Pin 14 is configured as THERM
 on Bit 0 and Bit 1 of
Configuration Register 4 (0x7D), THERM
 is enabled
on this pin.
If THERM
 is not enabled:
?SPAN class="pst ADT7476AARQZ-R_2298076_5"> Pin 22 becomes a 2.5 V measurement input.
?SPAN class="pst ADT7476AARQZ-R_2298076_5"> If Pin 14 is configured as THERM
, then THERM
 is
disabled on this pin.
Table 33. CONFIGURING PIN 14
Bit 1
Bit 0
Function
0
0
TACH4
0
1
THERM
1
0
SMBALERT
1
1
GPIO6
THERM
 as an Input
When THERM
 is configured as an input, the user can time
assertions on the THERM
  pin. This can be useful for
connecting to the PROCHOT
 output of a CPU to gauge
system performance.
When the THERM
 pin is driven low externally, the user
can also set up the ADT7476A to run the fans at 100%. The
fans run at 100% for the duration of time that the THERM
pin is pulled low. This is done by setting the BOOST bit
(Bit 2) in Configuration Register 3 (0x78) to 1. This works
only if the fan is already running, for example, in manual
mode, when the current duty cycle is above 0x00, or in
automatic mode when the temperature is above T
MIN
.
If the temperature is below T
MIN
 or if the duty cycle in
manual mode is set to 0x00, pulling the THERM
  low
externally has no effect. See Figure 31 for more information.
Figure 31. Asserting THERM
 Low as an Input in
Automatic Fan Speed Control Mode
THERM
 ASSERTED TO LOW AS
AN INPUT: FANS DO NOT GO
TO 100% BECAUSE TEMPERATURE
IS BELOW T
MIN
THERM
 ASSERTED TO LOW AS
AN INPUT: FANS GO TO 100%
BECAUSE TEMPERATURE IS
ABOVE T
MIN
  AND FANS ARE
ALREADY RUNNING.
T
MIN
THERM
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