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參數(shù)資料
| 型號(hào)： | TC670ECHTR |
| 廠商： | Microchip Technology |
| 文件頁(yè)數(shù)： | 6/14頁(yè) |
| 文件大?。?/td> | 354K |
| 描述： | IC FAN FAILURE DETECTOR SOT23A-6 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 功能： | 風(fēng)扇控制，溫度監(jiān)控器 |
| 傳感器類(lèi)型： | 內(nèi)部 |
| 感應(yīng)溫度： | -40°C ~ 85°C |
| 拓?fù)洌?/td> | 振蕩器 |
| 輸出類(lèi)型： | 開(kāi)路漏極 |
| 輸出警報(bào)： | 是 |
| 輸出風(fēng)扇： | 是 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-6 |
| 供應(yīng)商設(shè)備封裝： | SOT-23-6 |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁(yè)面： | 683 (CN2011-ZH PDF) |
| 其它名稱(chēng)： | TC670ECHTRDKR |
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TC670
DS21688C-page 6
?2003 Microchip Technology Inc.
4.0
DETAILED DESCRIPTION
The TC670 is an integrated fan speed sensor that
predicts/detects fan failure, consequently preventing
thermal damage to systems with cooling fans. When
the fan speed falls below a user-programmed threshold
level, the TC670 asserts an ALERT
signal. This
threshold is set with an external resistor divider
network.
FIGURE 4-1:
TC670 Block Diagram.
As shown in Figure 4-1, the TC670 senses the fan
pulses and internally converts those pulses from a
frequency into an analog voltage. This voltage is then
compared with the DC voltage at the THRESHOLD pin.
If the converted frequency-to-voltage value from the
fan's pulses falls below the threshold voltage, the
ALERT
output is pulled low.
In a 3.0V system, the external fan alert level on the
THRESHOLD pin can be designed from 0.0V (stalled
fan) to 2.4V (for 13,000 RPM) to cover most of the com-
mon fan speeds. This failure detection system works
with linear-controlled 2-wire fans and eliminates the
need for 3-wire fans. The TC670 can also work with
3-wire fans either by using the SENSE circuit or by
directly sensing the RPM output from the 3rd wire.
A CLEAR pin is provided to allow the user to reset the
ALERT
pin status back to a high state. This clear option
also allows the flexibility of connecting the ALERT
out-
put of the TC670 with other alert/fault interrupts in the
system without having a risk of a system shutdown due
to false fan fault condition.
FIGURE 4-2:
Typical Application Circuit.
4.1
SENSE Input
As shown in Figure 4-2, the SENSE input (Pin 6) is
connected to the sense resistor (R
SENSE
) through a
capacitor (C
SENSE
). The low value current sensing
resistor (R
SENSE
) is connected between the ground
return leg of the fan and the fan bias ground. During
normal fan operation, commutation occurs as each
pole of the fan is energized. This causes the fan current
to be an AC waveform with fast falling edges.
These short, rapid changes in fan current cause a
corresponding dV/dt voltage across the sense resistor,
as well as a corresponding dI/dt current through the
sense capacitor. The current through C
SENSE
is termi-
nated with the internal 50 k& input resistance at the
SENSE pin of the TC670. When positive-going fan
pulses at the SENSE input are greater than 124 mV
(typ.), the TC670 latches-in those voltage spikes. This
124 mV (typ.) SENSE input built-in threshold reduces
false triggering errors caused by extraneous noise
pulses associated with a running fan. The presence
and frequency of these pulses is a direct indication of
fan operation and fan speed.
THRESHOLD
124 mV
50 k&
SENSE
ALERT
CLEAR
Logic
Frequency-to-
Voltage
GND
V
DD
Bandgap
Oscillator
Note: This typical application circuit uses a LED to
indicate that a fan failure has occurred.
5
6
C
SENSE
R
4
R
SENSE
+12V
ALERT
LED
DC
FAN
DC
FAN
SENSE
ALERT
2
4
3
1
+5V
R
3
R
2
0.1 礔
V
DD
CLEAR
THRESHOLD
GND
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC670ECHTR | 制造商:Microchip Technology Inc 功能描述:IC CONTROLLER FAN MANAGEMENT 制造商:Microchip Technology Inc 功能描述:IC, CONTROLLER, FAN MANAGEMENT |
| TC670ECHTR | 制造商:Microchip Technology Inc 功能描述:Fan Management Controller IC Package/Cas |
| TC670ECHTR-CUT TAPE | 制造商:Microchip 功能描述:TC670 Series 3 to 5.5 V Tiny Predictive Fan Failure Detector - SOT-23-6 |
| TC68 | 功能描述:鋁質(zhì)電解電容器 - 帶引線 60uF 350V RoHS:否 制造商:Kemet 引線類(lèi)型: 電容:220 uF 容差:20 % 電壓額定值:25 V 工作溫度范圍: 端接類(lèi)型:Radial 外殼直徑:8 mm 外殼長(zhǎng)度:11 mm 引線間隔:5 mm 產(chǎn)品:General Purpose Electrolytic Capacitors 封裝:Bulk |
| TC-68.000MBD-T | 功能描述:標(biāo)準(zhǔn)時(shí)鐘振蕩器 68.000MHz 3.3V 25ppm -40C to 85C RoHS:否 制造商:AVX 產(chǎn)品:Standard Clock Oscillators 封裝 / 箱體:7 mm x 5 mm 頻率:75 MHz 頻率穩(wěn)定性:50 PPM 電源電壓:2.5 V 負(fù)載電容: 端接類(lèi)型:SMD/SMT 最小工作溫度:0 C 最大工作溫度:+ 70 C 輸出格式:LVDS 尺寸: 封裝:Reel 系列: |
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