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| 型號(hào)： | ADM1026JST-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 電源管理 |
| 英文描述： | Complete Thermal and System Management Controller |
| 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(yè)數(shù)： | 25/56頁(yè) |
| 文件大小： | 634K |
| 代理商： | ADM1026JST-REEL |
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ADM1026
Signal conditioning in the ADM1026 accommodates the slow
rise and fall times typical of fan tachometer outputs. The fan
tach inputs have internal 10 k pull-up resistors to 3.3 V STBY.
In the event that these inputs are supplied from fan outputs that
exceed the supply, either resistive attenuation of the fan signal
or diode clamping must be included to keep inputs within an
acceptable range. Figure 44 through Figure 47 show circuits for
common fan tach outputs.
Rev. A | Page 25 of 56
If the fan tach output is open-drain or has a resistive pull-up to
V
CC
, then it can be connected directly to the fan input, as shown
in Figure 44.
12V
FAN SPEED
COUNTER
FAN(0–7)
PULL-UP
4.7k
TYP
TACH
OUTPUT
V
CC
0
Figure 44. Fan with Tach Pull-Up to +V
CC
If the fan output has a resistive pull-up to +12 V (or other
voltage greater than 3.3 V STBY), the fan output can be clamped
with a Zener diode, as shown in Figure 45. The Zener voltage
should be chosen so that it is greater than V
IH
but less than 3.3 V
STBY, allowing for the voltage tolerance of the Zener.
12V
FAN SPEED
COUNTER
FAN(0–7)
PULL-UP
4.7k
TYP
TACH
OUTPUT
V
CC
*CHOOSE ZD1 VOLTAGE APPROXIMATELY 0.8
×
V
CC
ZD1*
ZENER
0
Figure 45. Fan with Tach Pull-Up to Voltage > V
CC
(e.g. 12 V),
Clamped with Zener Diode
If the fan has a strong pull-up (less than 1 k) to +12 V, or a
totem pole output, a series resistor can be added to limit the
Zener current, as shown in Figure 46. Alternatively, a resistive
attenuator may be used, as shown in Figure 47.
R1 and R2 should be chosen such that
(
)
STBY
V
3
PULLUP
V
2V
<
+
+
×
<
R2
R1
PULLUP
R
R2
12V
FAN SPEED
COUNTER
FAN(0–7)
PULL-UP TYP
<1 k
OR
TOTEM POLE
TACH
OUTPUT
V
CC
*CHOOSE ZD1 VOLTAGE APPROXIMATELY 0.8
×
V
CC
ZD1*
ZENER
R1
10k
0
Figure 46. Fan with Strong Tach Pull-Up to > V
CC
or Totem Pole Output,
Clamped with Zener and Resistor
12V
FAN SPEED
COUNTER
FAN(0–7)
<1 k
TACH
OUTPUT
V
CC
R1*
*SEE TEXT
0
Figure 47. Fan with Strong Tach Pull-Up to >V
CC
or Totem Pole Output,
Attenuated with R1/R2
FAN SPEED MEASUREMENT
The fan counter does not count the fan tach output pulses
directly because the fan speed may be less than 1000 RPM and
it would take several seconds to accumulate a reasonably large
and accurate count. Instead, the period of the fan revolution is
measured by gating an on-chip 22.5 kHz oscillator into the
input of an 8-bit counter for two periods of the fan tach output,
as shown in Figure 48, so the accumulated count is actually
proportional to the fan tach period and inversely proportional
to the fan speed.
22.5kHz
CLOCK
CONFIGURATION
REG. 1 BIT 0
FAN0
INPUT
FAN0
MEASUREMENT
PERIOD
FAN1
MEASUREMENT
PERIOD
START OF
MONITORING
CYCLE
FAN1
INPUT
1
2
3
4
1
2
3
4
0
Figure 48. Fan Speed Measurement
The monitoring cycle begins when a 1 is written to the monitor
bit (Bit 0 of Configuration Register 1). The INT_Enable (Bit 1)
should be set to 1 to enable the INT output.
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| 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(kù) 輸出類型:2 線 SMBus? 輸出警報(bào):無(wú) 輸出風(fēng)扇:無(wú) 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 |
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