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參數(shù)資料
| 型號： | TC650CFVUA |
| 廠商： | Microchip Technology Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Tiny Integrated Temperature Sensor & Brushless DC Fan Controller with Over-Temperature Alert |
| 中文描述： | 微型集成溫度傳感器 |
| 文件頁數(shù)： | 5/14頁 |
| 文件大?。?/td> | 440K |
| 代理商： | TC650CFVUA |
2002 Microchip Technology Inc.
DS21450B-page 5
TC650/TC651
3.0
DETAILED DESCRIPTION
The TC650/TC651 acquire and convert their junction
temperature (T
J
) information from an on-chip solid-state
sensor with a typical accuracy of ±1°C. The temperature
data is digitally stored in an internal register. The
register is compared with pre-defined threshold values.
The six threshold values are equally distributed over a
pre-defined range of temperatures (see Table 3-1 and
Table 3-2). The TC650/TC651 control the speed of a
DC brushless fan using a fractional speed control
scheme. The output stage requires only a 2N2222-type
small-signal BJT for fans up to 300mA. For larger
current fans (up to 1 Amp) a logic-level N-channel
MOSFET may be used. In addition to controlling the
speed of the fan, the TC650/TC651 include an on-chip
over-temperature alarm (T
OVER
) that gives a low signal
when the temperature of the chip exceeds T
H
by 10°C,
(typical). This feature eliminates the need for a separate
temperature sensor for over-temperature monitoring.
TABLE 3-1:
TEMPERATURE RANGE
DEFINITION FOR TC650
(MINIMUM-SPEED MODE)
TABLE 3-2:
TEMPERATURE RANGE
DEFINITION FOR TC651
(AUTO-SHUTDOWN MODE)
FIGURE 3-1:
FUNCTIONAL BLOCK
DIAGRAM
3.1
PWM Output
The PWM pin is designed to drive a low cost transistor
or MOSFET as the low side power switching element in
the
system.
This
output
complementary drive and is optimized for driving NPN
transistors or N-channel MOSFETs. Since the system
relies on PWM rather than linear power control, the
dissipation in the power switch is kept to a minimum.
Generally,
very
small
devices
packages) will suffice. The frequency of the PWM is
about 15Hz. The PWM is also the time base for the
Start-up Timer (see paragraphs below). The PWM duty
cycle has a range of 40% to 100% for the TC650 and
50% to 100% for the TC651.
has
an
asymmetric
(TO-92
or
SOT
3.2
Start-Up Timer
To ensure reliable fan start-up, the Start-up Timer turns
PWM high for about 2 seconds whenever the fan is
started from the off state. This occurs at power-up and
when coming out of Shutdown mode.
3.3
Over-Temperature Alert (T
OVER
)
This pin goes low when the T
H
set point is exceeded by
10
o
C (typical). This indicates that the fan is at
maximum drive and the potential exists for system
overheating; either heat dissipation in the system has
gone beyond the cooling system's design limits, or
some FAULT exists such as fan bearing failure or an
airflow obstruction. This output may be treated as a
“System Overheat” warning and used to trigger system
shutdown, or bring other fans to full speed in the
system. The fan will continue to run at 100% speed
while T
OVER
is asserted. Built-in hysteresis prevents
T
OVER
from “chattering” when measured temperature
is at or near the T
H
+ 10°C trip point. As temperature
falls through the T
H
+ 10°C trip point, hysteresis
maintains the T
OVER
output low until measured
temperature is 5°C above the trip point setting.
Temperature (T = T
J
)
T < T
L
T
L
< = T < T
1
T
1
< = T < T
2
T
2
< = T <T
3
T
3
< = T < T
4
T
4
< = T < T
H
T
H
< = T < T
OV
T
OV
< = T
PWM Duty Cycle
40%
50%
60%
70%
80%
90%
100%
100% with Over Temp Alert
(T
OVER
= L)
Temperature (T = T
J
)
T < T
L
T
L
< = T < T
1
T
1
< = T < T
2
T
2
< =T < T
3
T
3
< =T < T
4
T
4
< = T < T
H
T
H
< = T < T
OV
T
OV
< = T
PWM Duty Cycle
“OFF”
50%
60%
70%
80%
90%
100%
100% with Over-Temp Alert
(T
OVER
= L)
Note:
The temperature regions defined by the six temperature thresh-
olds are pre-defined in the TC650/TC651 by means of trimming. Once
a T
and T
are programmed, the T
1
– T
4
thresholds are automatically
equally spaced between T
L
and T
H
.
Temperature Sensor
Duty Cycle
Logic
Control
A/D Converter
Oscillator
Temperature
Set Point and
Trim Range
SHDN
T
OVER
PWM
V
DD
V+
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC651CFVUA | Tiny Integrated Temperature Sensor & Brushless DC Fan Controller with Over-Temperature Alert |
| TC650CGVUA | Tiny Integrated Temperature Sensor & Brushless DC Fan Controller with Over-Temperature Alert |
| TC651CGVUA | Tiny Integrated Temperature Sensor & Brushless DC Fan Controller with Over-Temperature Alert |
| TC651GDVUA | Tiny Integrated Temperature Sensor & Brushless DC Fan Controller with Over-Temperature Alert |
| TC651EFVUA | Tiny Integrated Temperature Sensor & Brushless DC Fan Controller with Over-Temperature Alert |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC650CGUA | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Tiny Integrated Temperature Sensor & Brushless DC Fan Controller with Overtemperature Alert |
| TC650CGUATR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Tiny Integrated Temperature Sensor & Brushless DC Fan Controller with Overtemperature Alert |
| TC650CGV | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Tiny Integrated Temperature Sensor & Brushless DC Fan Controller with Overtemperature Alert |
| TC650CGVUA | 功能描述:板上安裝溫度傳感器 W/ Over Temp Alert 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(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: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| TC650CGVUATR | 功能描述:板上安裝溫度傳感器 W/ Over Temp Alert 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(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: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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