- 您現在的位置：買賣IC網 > Datasheet目錄45 > NCT7491RQR2G (ON Semiconductor)IC REMOTE THERMAL MONITOR 24QSOP Datasheet資料下載
參數資料
| 型號： | NCT7491RQR2G |
| 廠商： | ON Semiconductor |
| 文件頁數： | 50/80頁 |
| 文件大小： | 844K |
| 描述： | IC REMOTE THERMAL MONITOR 24QSOP |
| 標準包裝： | 2,500 |
| 系列： | * |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁當前第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁
NCT7491
http://onsemi.com
50
Table 51. TEMPERATURE READING REGISTERS (PowerOn Default = 0x80) (Notes 10, 11, 12)
Register Address
R/W
Description
0x25
R
Remote 1 temperature reading (Notes 12, 13) (8 MSB of reading).
0x26
R
Local temperature reading (8 MSB of reading).
0x27
R
Remote 2 temperature reading (Notes 12, 13) (8 MSB of reading).
10.If the extended resolution bits of these readings are also being read, the extended resolution registers (Reg. 0x76, 0x77) must be read first.
Once the extended resolution registers have been read, all associated MSB reading registers are frozen until read. Both the extended
resolution registers and the MSB registers are frozen.
11.These temperature readings can be in twos complement or offset 64 format; this interpretation is determined by Bit 0 of Configuration Register
5 (0x7C).
12.In twos complement mode, a temperature reading of 128癈 (0x80) indicates a diode fault (open or short) on that channel.
13.In offset 64 mode, a temperature reading of 64癈 (0x00) indicates a diode fault (open or short) on that channel.
Table 52. FAN TACHOMETER READING REGISTERS (PowerOn Default = 0x00) (Note 14)
Register Address
R/W
Description
0x28
R
TACH1 low byte.
0x29
R
TACH1 high byte.
0x2A
R
TACH2 low byte.
0x2B
R
TACH2 high byte.
0x2C
R
TACH3 low byte.
0x2D
R
TACH3 high byte.
0x2E
R
TACH4 low byte.
0x2F
R
TACH4 high byte.
14.These registers count the number of 11.11 ms periods (based on an internal 90 kHz clock) that occur between a number of consecutive fan
TACH pulses (default = 2). The number of TACH pulses used to count can be changed using the fan pulses per revolution register (Reg.
0x7B). This allows the fan speed to be accurately measured. Because a valid fan tachometer reading requires that two bytes be read, the
low byte must be read first. Both the low and high bytes are then frozen until read. At poweron, these registers contain 0x0000 until the first
valid fan TACH measurement is read into these registers. This prevents false interrupts from occurring while the fans are spinning up.
A count of 0xFFFF indicates that a fan is one of the following: stalled or blocked (object jamming the fan), failed (internal circuitry destroyed),
or not populated. (The NCT7491 expects to see a fan connected to each TACH. If a fan is not connected to that TACH, its TACH minimum
high and low bytes should be set to 0xFF.)
Table 53. CURRENT PWM DUTY CYCLE REGISTERS (PowerOn Default = 0xFF) (Note 15)
Register Address
R/W
Description
0x30
R/W
PWM1 current duty cycle (0% to 100% duty cycle = 0x00 to 0xFF).
0x31
R/W
PWM2 current duty cycle (0% to 100% duty cycle = 0x00 to 0xFF).
0x32
R/W
PWM3 current duty cycle (0% to 100% duty cycle = 0x00 to 0xFF).
15.These registers reflect the PWM duty cycle driving each fan at any given time. When in automatic fan speed control mode, the NCT7491
reports the PWM duty cycles back through these registers. The PWM duty cycle values vary according to temperature in automatic fan speed
control mode. During fan startup, these registers report back 0x00. In manual mode, the PWM duty cycle outputs can be set to any duty cycle
value by writing to these registers.
Table 54. REGISTER 0x33 PECI0 READING REGISTER (PowerOn Default = 0x80)
Register Address
R/W
Description
0x33
R
PECI0: This register reads the 8 bits representative of PECI Client Address stored in register 0x00
Table 55. PECI LIMIT REGISTERS REGISTER
Register Address
R/W
Description
PowerOn Default
0x34
R/W
PECI Low Limit
0x81
0x35
R/W
PECI High Limit
0x00
相關PDF資料 |
PDF描述 |
|---|---|
| NCT75MNR2G | IC SENSOR TEMP DGTL 8DFN |
| NCV8881PWR2G | IC REG TRPL BUCK/LINEAR 16SOIC |
| NE1617ADS,112 | IC TEMP MONITOR 16SSOP |
| NE1619DS,118 | IC TEMP MONITOR 16SSOP |
| NIS5112D1R2G | IC ELECTRONIC FUSE HOTSWAP 8SOIC |
相關代理商/技術參數 |
參數描述 |
|---|---|
| NCT75DMR2G | 功能描述:板上安裝溫度傳感器 2-Channel Digital Thermometer w/ Alarm RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| NCT75DR2G | 功能描述:板上安裝溫度傳感器 2-Channel Digital Thermometer w/ Alarm RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| NCT75MNR2G | 功能描述:板上安裝溫度傳感器 HAS2MONOJLCC84SPACE RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| NCT7717U TR | 制造商:Nuvoton Technology Corp 功能描述:SMBUS INTERFACE TEMP. SENSOR W 制造商:Nuvoton Technology Corp 功能描述:IC SMBUS TEMP SENSOR 8MSOP |
| NCT7718W TR | 制造商:Nuvoton Technology Corp 功能描述:IC SMBUS TEMP SENSOR 8MSOP |
發布緊急采購，3分鐘左右您將得到回復。