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參數資料
型號: ADT7476AARQZ-R
廠商: ON Semiconductor
文件頁數: 54/66頁
文件大小: 945K
描述: IC REMOTE THERMAL CTLR 24QSOP
產品變化通告: 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: 風扇控制,溫度監控器
傳感器類型: 內部和外部
感應溫度: -40°C ~ 125°C
精確度: ±2.5%
拓撲: ADC,比較器,風扇速度計數器,多路復用器,寄存器庫
輸出類型: SMBus?
輸出警報:
輸出風扇:
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)
供應商設備封裝: 24-QSOP
包裝: 帶卷 (TR)
其它名稱: ADT7476AARQZ-R-ND
ADT7476AARQZ-ROSTR
ADT7476A
http://onsemi.com
54
Table 63. FAN TACH LIMIT REGISTERS (Note 1)
Register Address
R/W
Description
Power-On Default
0x54
R/W
TACH1 Minimum Low Byte
0xFF
0x55
R/W
TACH1 Minimum High Byte/Single-channel
ADC Channel Select
0xFF
0x56
R/W
TACH2 Minimum Low Byte
0xFF
0x57
R/W
TACH2 Minimum High Byte
0xFF
0x58
R/W
TACH3 Minimum Low Byte
0xFF
0x59
R/W
TACH3 Minimum High Byte
0xFF
0x5A
R/W
TACH4 Minimum Low Byte
0xFF
0x5B
R/W
TACH4 Minimum High Byte
0xFF
1.  Exceeding any of the TACH limit registers by 1 indicates that the fan is running too slowly or has stalled. The appropriate status bit is set
in Interrupt Status Register 2 to indicate the fan failure. Setting the Configuration Register 1 Lock bit has no effect on these registers.
Table 64. REGISTER 0x55  TACH1 MINIMUM HIGH BYTE (POWER-ON DEFAULT = 0xFF)
Bit No.
Mnemonic
R/W
Description
[4:0]
Reserved
Read-only
When Bit 6 of Configuration 2 Register (0x73) is set (single-channel ADC mode), these bits
are reserved. Otherwise, these bits represent Bits [4:0] of the TACH1 minimum high byte.
[7:5]
SCADC
R/W
When Bit 6 of Configuration 2 Register (0x73) is set (single-channel ADC mode), these bits
are used to select the only channel from which the ADC will take measurements. Otherwise,
these bits represent Bits [7:5] of the TACH1 minimum high byte.
Table 65. PWM CONFIGURATION REGISTERS (Note 1)
Register Address
R/W
Description
Power-On Default
0x5C
R/W
PWM1 Configuration
0x62
0x5D
R/W
PWM2 Configuration
0x62
0x5E
R/W
PWM3 Configuration
0x62
Bit No.
Name
R/W
Description
[2:0]
SPIN
R/W
These bits control the startup timeout for PWMx. The PWM output stays high until two valid
TACH rising edges are seen from the fan. If there is not a valid TACH signal during the fan
TACH measurement directly after the fan startup timeout period, the TACH measurement
reads 0xFFFF and Interrupt Status Register 2 reflects the fan fault. If the TACH minimum
high and low bytes contain 0xFFFF or 0x0000, the Interrupt Status Register 2 bit is not set,
even if the fan has not started.
000 = No Startup Timeout
001 = 100 ms
010 = 250 ms (Default)
011 = 400 ms
100 = 667 ms
101 = 1 sec
110 = 2 sec
111 = 4 sec
[3]
RES
N/A
Reserved. Do not write to this bit.
[4]
INV
R/W
This bit inverts the PWM output. The default is 0, which corresponds to a logic high output for
100% duty cycle. Setting this bit to 1 inverts the PWM output, so 100% duty cycle
corresponds to a logic low output.
[7:5]
BHVR
R/W
These bits assign each fan to a particular temperature sensor for localized cooling.
000 = Remote 1 Temperature Controls PWMx (Automatic Fan Control Mode)
001 = Local Temperature Controls PWMx (Automatic Fan Control Mode)
010 = Remote 2 Temperature Controls PWMx (Automatic Fan Control Mode)
011 = PWMx Runs Full Speed (Default)
100 = PWMx Disabled
101 = Fastest Speed Calculated by Local and Remote 2 Temperature Controls PWMx
110 = Fastest Speed Calculated by All Three Temperature Channel Controls PWMx
111 = Manual Mode. PWM Current Duty Cycle Registers (0x30 to 0x32) Become Writable
1.  These registers become read-only when the Configuration Register 1 Lock bit is set to 1. Any subsequent attempts to write to these registers fail.
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ADT7476AARQZ-REEL7 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 標準包裝:1 系列:- 功能:溫度監控系統(傳感器) 傳感器類型:內部和外部 感應溫度:-40°C ~ 125°C,外部傳感器 精確度:±2.5°C 本地(最大值),±5°C 遠程(最大值) 拓撲:ADC,比較器,寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應商設備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6
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