- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373995 > ADM1026JST (ANALOG DEVICES INC) Circular Connector; No. of Contacts:28; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:19; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:19-28 PDF資料下載
參數(shù)資料
| 型號： | ADM1026JST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 電源管理 |
| 英文描述： | Circular Connector; No. of Contacts:28; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:19; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:19-28 |
| 中文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP48 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, MS-026BBC, LQFP-48 |
| 文件頁數(shù)： | 26/56頁 |
| 文件大?。?/td> | 634K |
| 代理商： | ADM1026JST |
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頁當(dāng)前第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頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁
ADM1026
The fan speed counter starts counting as soon as the fan
channel has been switched to. If the fan tach count reaches 0xFF,
the fan has failed or is not connected. If a fan is connected and
running, the counter is reset on the second tach rising edge, and
oscillator pulses are actually counted from the second rising
tach edge to the fourth rising edge. The measurement then
switches to the next fan channel. Here again, the counter begins
counting and is reset on the second tach rising edge, and
oscillator pulses are counted from the second rising edge to the
fourth rising edge. This is repeated for the other six fan
channels.
Rev. A | Page 26 of 56
Note that fan speed measurement does not occur until 1.8
seconds after the monitor bit has been set. This is to allow the
fans adequate time to spin up. Otherwise, the ADM1026 could
generate false fan failure interrupts. During the 1.8 second fan
spin-up time, all fan tach registers read 0x00.
To accommodate fans of different speed and/or different
numbers of output pulses per revolution, a prescaler (divisor) of
1, 2, 4, or 8 may be added before the counter. Divisor values for
Fans 0 to 3 are contained in the Fan 0–3 divisor register
(Address 02h) and those for Fans 4 to 7 in the Fan 4–7 divisor
register (Address 03h). The default value is 2, which gives a
count of 153 for a fan running at 4400 RPM producing two
output pulses per revolution. The count is calculated by the
equation:
×
×
=
Divisor
RPM
Count
×
60
10
5
22
3
For constant-speed fans, fan failure is typically considered to
have occurred when the speed drops below 70% of nominal,
corresponding to a count of 219. Full scale (255) is reached if
the fan speed fell to 60% of its nominal value. For temperature-
controlled, variable-speed fans, the situation is different.
Table 8 shows the relationship between fan speed and time per
revolution at 60%, 70%, and 100% of nominal RPM for fan
speeds of 1100, 2200, 4400, and 8800 RPM, and the divisor that
would be used for each of these fans, based on two tach pulses
per revolution.
Limit Values
Fans generally do not over-speed if run from the correct
voltage, so the failure condition of interest is under speed due to
electrical or mechanical failure. For this reason, only low speed
limits are programmed into the limit registers for the fans. It
should be noted that because fan period rather than speed is
being measured, a fan failure interrupt occurs when the
measurement exceeds the limit value.
Fan Monitoring Cycle Time
The fan speeds are measured in sequence from 0 to 7. The
monitoring cycle time depends on the fan speed, the number
of tach output pulses per revolution, and the number of fans
being monitored.
If a fan is stopped or running so slowly that the fan speed
counter reaches 255 before the second tach pulse after initializa-
tion, or before the fourth tach pulse during measurement, the
measurement is terminated. This also occurs if an input is con-
figured as GPIO instead of fan. Any channels connected in this
manner time out after 255 clock pulses.
The worst-case measurement time for a fan-configured channel
occurs when the counter reaches 254 from start to the second
tach pulse and reaches 255 after the second tach pulse. Taking
into account the tolerance of the oscillator frequency, the worst-
case measurement time is
509 ×
D
× 0.05 ms
where:
509 is the total number of clock pulses.
D
is the divisor: 1, 2, 4, or 8.
0.05 ms is the worst-case oscillator period in ms.
The worst-case fan monitoring cycle time is the sum of the
worst-case measurement time for each fan.
Although the fan monitoring cycle and the analog input
monitoring cycle are started together, they are not synchronized
in any other way.
Table 8. Fan Speeds and Divisors
Divisor RPM
÷ 1
÷ 2
÷ 4
÷ 8
Nominal Rev
8800
4400
2200
1100
Time Per
Rev 70% (ms)
9.74
19.48
38.96
77.92
RPM (ms)
6.82
13.64
27.27
54.54
70% RPM
6160
3080
1540
770
60% RPM
5280
2640
1320
660
Rev 60% (ms)
11.36
22.73
45.45
90.9
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADM1030ARQ | Intelligent Temperature Monitor and PWM Fan Controller |
| ADM1030 | Circular Connector; No. of Contacts:66; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:19; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:19-35 |
| ADM1033 | Thermal Monitor and Fan Speed (RPM) Controller |
| ADM1033ARQ | Thermal Monitor and Fan Speed (RPM) Controller |
| ADM1033ARQ-REEL | Thermal Monitor and Fan Speed (RPM) Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADM1026JST-REEL | 功能描述:IC CNTRL SYS REF/EEPROM 48LQFP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)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(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風(fēng)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(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
| ADM1026JST-REEL7 | 功能描述:IC CNTRL SYS REF/EEPROM 48LQFP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)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(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風(fēng)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(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
| ADM1026JSTZ | 功能描述:PMIC 解決方案 HI INT SYS MONITR IC RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| ADM1026JSTZ-R7 | 功能描述:PMIC 解決方案 HI INT SYS MONITR IC RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| ADM1026JSTZ-REEL | 功能描述:板上安裝溫度傳感器 HI INT SYS MONITR IC RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)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(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。