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參數資料
| 型號： | LM88 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Factory Programmable Dual Remote-Diode Thermostat |
| 中文描述： | 工廠可編程雙通道遠程二極管溫控器 |
| 文件頁數： | 5/9頁 |
| 文件大?。?/td> | 196K |
| 代理商： | LM88 |
1.0 Functional Description
1.1 PIN DESCRIPTIONS
V
+
This is the positive supply voltage pin, which has
a range of 2.8 to 3.8 volts. This pin should be
bypassed with a 0.1μF capacitor to ground.
GND
This is the ground pin.
D0+, D1+ These pins connect to the positive terminal of the
diodes (e.g. a 2N3904 collector base shorted or a
Pentium thermal diode anode) and provide the
source current for forward biasing the diodes for
the temperature measurement. During a tem-
perature conversion, the current source switches
between 120μA and 12μA. The diodes are
sampled sequentially.
D
This pin should be connected to the negative pin
of each diode (e.g. a 2N3904 emitter or a Pen-
tium thermal diode cathode). A star connection is
recommended. Separate traces should be routed
from this pin to each diode cathode. This pin
biases the negative diode terminals to approxi-
mately 0.7V.
O_CRIT
This is an active-low open-drain digital output. It
goes LOW when a comparison of either diode
temperature reading to the setpoint T_CRIT is
true. It returns to HIGH when the comparison of
the diode temperature, that caused the true con-
dition, to T_CRIT
±
1C is false. The CRIT com-
parator can be factory programmed to make a
greater than or less than comparison. (See Sec-
tion 1.3 LM88 OPTIONS)
This is an active-low open-drain digital output. It
goes LOW when the comparison of the tempera-
ture reading of diode one to the value of T_SP1 is
true. The SP1 comparator has a built in hyster-
esis of 1C. Therefore, O_SP1 returns to HIGH
when diode one’s temperature comparison to the
value of T_SP1
±
1C is false. The SP1 compara-
tor can be factory programmed to make a greater
than or less than comparison.(See Section 1.3
LM88 OPTIONS)
This is an active-low open-drain digital output. It
goes LOW when the comparison of the tempera-
ture reading of diode one to the value of T_SP0 is
true. The SP0 comparator has a built in hyster-
esis of 1C. Therefore, O_SP0 returns to HIGH
when diode one’s temperature comparison to the
value of T_SP0
±
1C is false. The SP0 compara-
tor can be factory programmed to make a greater
than or less than comparison.(See Section 1.3
LM88 OPTIONS)
O_SP1
O_SP0
10132611
a) When programmed for a greater than comparison
10132612
b) When programmed for a less than comparison
FIGURE 2. Comparator output temperature response diagrams
L
www.national.com
5
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