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參數資料
型號: ADT7463ARQZ-REEL
廠商: ON Semiconductor
文件頁數: 20/50頁
文件大小: 726K
描述: IC REMOTE THERMAL CTRLR 24-QSOP
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 ~ 120°C,外部傳感器
精確度: ±1.5°C(最小值)
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 ~ 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)
供應商設備封裝: 24-QSOP
包裝: 帶卷 (TR)
ADT7463
http://onsemi.com
20
Additional ADC Functions for Temperature
Measurement
A number of other functions are available on the
ADT7463 to offer the systems designer increased flexibility.
Turnoff Averaging
For each temperature measurement read from a value
register, 16 readings have actually been made internally and
the results averaged before being placed into the value
register. Sometimes it may be necessary to take a very fast
measurement, e.g., of CPU temperature. Setting Bit 4 of
Configuration Register 2 (Reg. 0x73) turns averaging off.
This takes a reading every 13 ms. The measurement itself
takes 4 ms.
Singlechannel ADC Conversions
Setting Bit 6 of Configuration Register 2 (Reg. 0x73)
places the ADT7463 into singlechannel ADC conversion
mode. In this mode, the ADT7463 can be made to read a
single temperature channel only. If the internal ADT7463
clock is used, the selected input is read every 1.4 ms. The
appropriate ADC channel is selected by writing to
Bits <7:5> of TACH1 Minimum High Byte Register (0x55).
Table 21. CONFIGURATION REGISTER 2 (REG. 0X73)
Bit
Description
<4>
1: Averaging Off
<6>
1: Singlechannel Convert Mode
Table 22. TACH1 MINIMUM HIGH BYTE (REG. 0X55)
Bit
Description
<7:5>
Selects ADC Channel for
Singlechannel Convert Mode
Value
Channel Selected
101
Remote 1 Temp
110
Local Temp
111
Remote 2 Temp
Limits, Status Registers, and Interrupts
Limit Values
Associated with each measurement channel on the
ADT7463 are high and low limits. These can form the basis
of system status monitoring: a status bit can be set for any
outoflimit condition and detected by polling the device.
Alternatively, SMBALERT
 interrupts can be generated to
flag a processor or microcontroller of outoflimit
conditions.
8bit Limits
The following is a list of 8bit limits on the ADT7463.
Table 23. VOLTAGE LIMIT REGISTERS
Register
Description
Default
0x44
2.5 V Low Limit
0x00
0x45
2.5 V High Limit
0xFF
0x46
V
CCP
 Low Limit
0x00
0x47
V
CCP
 High Limit
0xFF
0x48
V
CC
 Low Limit
0x00
0x49
V
CC
 High Limit
0xFF
0x4A
5 V Low Limit
0x00
0x4B
5 V High Limit
0xFF
0x4C
12 V Low Limit
0x00
0x4D
12 V High Limit
0xFF
Table 24. TEMPERATURE LIMIT REGISTERS
Register
Description
Default
0x4E
Remote 1 Temperature Low Limit
0x81
0x4F
Remote 1 Temperature High Limit
0x7F
0x6A
Remote 1 THERM
 Limit
0x64
0x50
Local Temperature Low Limit
0x81
0x51
Local Temperature High Limit
0x7F
0x6B
Local THERM
 Limit
0x64
0x52
Remote 2 Temperature Low Limit
0x81
0x53
Remote 2 Temperature High Limit
0x7F
0x6C
Remote 2 THERM
 Limit
0x64
Table 25. THERM
 LIMIT REGISTERS
Register
Description
Default
0x7A
THERM
 Limit
0x00
16bit Limits
The fan TACH measurements are 16bit results. The fan
TACH limits are also 16 bits, consisting of a high byte and
low byte. Since fans running under speed or stalled are
normally the only conditions of interest, only high limits
exist for fan TACHs. Since fan TACH period is actually
being measured, exceeding the limit indicates a slow or
stalled fan.
Table 26. FAN LIMIT REGISTERS
Register
Description
Default
0x54
TACH1 Minimum Low Byte
0xFF
0x55
TACH1 Minimum High Byte
0xFF
0x56
TACH2 Minimum Low Byte
0xFF
0x57
TACH2 Minimum High Byte
0xFF
0x58
TACH3 Minimum Low Byte
0xFF
0x59
TACH3 Minimum High Byte
0xFF
0x5A
TACH4 Minimum Low Byte
0xFF
0x5B
TACH4 Minimum High Byte
0xFF
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