參數(shù)資料
型號(hào)： ADT7476AARQZ-R
廠商： ON Semiconductor
文件頁數(shù)： 62/66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(jì)數(shù)器，多路復(fù)用器，寄存器庫
輸出類型： SMBus?
輸出警報(bào)： 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
62
Table 82. REGISTER 0x78  CONFIGURATION REGISTER 3 (POWER-ON DEFAULT = 0x00) (Note 1)
Bit No.
Mnemonic
R/W
Description
[0]
ALERT
R/W
ALERT = 1, Pin 10 (PWM2/SMBALERT
) is configured as an SMBALERT
 interrupt output to
indicate out-of-limit error conditions.
ALERT = 0, Pin 10 (PWM2/SMBALERT
) is configured as the PWM2 output.
[1]
THERM
/
2.5V
R/W
THERM
= 1 enables THERM
 functionality on Pin 22 and Pin 14, if Pin 14 is configured as
THERM
, determined by Bits 0 and 1 (PIN14FUNC) of Configuration Register 4. When THERM
is asserted, if the fans are running and the BOOST bit is set, then the fans run at full speed.
Alternatively, THERM
 can be programmed so that a timer is triggered to time how long THERM
has been asserted.
THERM
= 0 enables 2.5V measurement on Pin 22 and disables THERM
. If Bits [5:7] of
Configuration Register 5 are set, THERM
 is bidirectional. If they are 0, THERM
 is a timer input
only.
Pin14FUNC
THERM
/2.5 V
Pin 22
Pin 14
00
01
10
11
00
01
10
11
0
0
0
0
1
1
1
1
+2.5 V
IN
+2.5 V
IN
+2.5 V
IN
+2.5 V
IN
THERM
+2.5 V
IN
THERM
THERM
TACH4
THERM
SMBALERT
GPIO6
TACH4
THERM
SMBALERT
GPIO6
[2]
BOOST
R/W
When THERM
 is an input and BOOST = 1, assertion of THERM
 causes all fans to run at the
maximum programmed duty cycle for fail-safe cooling.
[3]
FAST
R/W
FAST = 1 enables fast TACH measurements on all channels. This increases the TACH
measurement rate from once per second to once every 250 ms (4x).
[4]
DC1
R/W
DC1 = 1 enables TACH measurements to be continuously made on TACH1. Fans must be
driven by dc. Setting this bit prevents pulse stretching because it is not required for dc-driven
motors.
[5]
DC2
R/W
DC2 = 1 enables TACH measurements to be continuously made on TACH2. Fans must be
driven by dc. Setting this bit prevents pulse stretching because it is not required for dc-driven
motors.
[6]
DC3
R/W
DC3 = 1 enables TACH measurements to be continuously made on TACH3. Fans must be
driven by dc. Setting this bit prevents pulse stretching because it is not required for dc-driven
motors.
[7]
DC4
R/W
DC4 = 1 enables TACH measurements to be continuously made on TACH4. Fans must be
driven by dc. Setting this bit prevents pulse stretching because it is not required for dc-driven
motors.
1.  This register become read-only when the Configuration Register 1 Lock bit is set to 1. Any further attempts to write to to this register have no
effect.
Table 83. REGISTER 0x79  THERM
 TIMER STATUS REGISTER (POWER-ON DEFAULT = 0x00)
Bit No.
Mnemonic
R/W
Description
[7:1]
TMR
Read-only
Times how long THERM
 input is asserted. These seven bits read 0 until the THERM
assertion time exceeds 45.52 ms.
[0]
ASRT/
TMR0
Read-only
This bit is set high on the assertion of the THERM
 input and is cleared on read. If the THERM
assertion time exceeds 45.52 ms, this bit is set and becomes the LSB of the 8-bit TMR
reading. This allows THERM
 assertion times from 45.52 ms to 5.82 sec to be reported back
with a resolution of 22.76 ms.
Table 84. REGISTER 0x7A  THERM
 TIMER LIMIT REGISTER (POWER-ON DEFAULT = 0x00)
Bit No.
Mnemonic
R/W
Description
[7:0]
LIMT
R/W
Sets maximum THERM
 assertion length allowed before an interrupt is generated. This is an
8-bit limit with a resolution of 22.76 ms allowing THERM
 assertion limits of 45.52 ms to
5.82 sec to be programmed. If the THERM
 assertion time exceeds this limit, Bit 5 (F4P) of
Interrupt Status Register 2 (0x42) is set. If the limit value is 0x00, an interrupt is generated
immediately on the assertion of the THERM
 input.
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