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參數資料
| 型號： | LM56BIMMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Dual Output Low Power Thermostat |
| 中文描述： | DIGITAL TEMP SENSOR-DUAL TRIP POINT, 3Cel, SQUARE, SURFACE MOUNT |
| 封裝： | MSOP-8 |
| 文件頁數： | 8/13頁 |
| 文件大小： | 370K |
| 代理商： | LM56BIMMX |
Application Hints
2.0
For simplicity the following is an analysis of the trip point ac-
curacy using the single output configuration show in Figure 2
with a set point of 82C.
Trip Point Error Voltage = V
TPE
,
Comparator Offset Error for V
T1E
Temperature Sensor Error = V
TSE
Reference Output Error = V
RE
LM56 TRIP POINT ACCURACY SPECIFICATION
1. V
TPE
=
±
V
T1E
V
TSE
+ V
RE
Where:
2. V
T1E
=
±
8 mV (max)
3. V
TSE
= (6.20 mV/C) x (
±
3C) =
±
18.6 mV
4. V
RE
= 1.250V x (
±
0.01) R2/(R1 + R2)
Using Equations from page 1 of the datasheet.
V
T1
=1.25VxR2/(R1+R2)=(6.20 mV/C)(82C) +395 mV
Solving for R2/(R1 + R2) = 0.7227
then,
5. V
RE
= 1.250V x (
±
0.01) R2/(R1 + R2) = (0.0125) x
(0.7227) =
±
9.03 mV
The individual errors do not add algebraically because, the
odds of all the errors being at their extremes are rare. This is
proven by the fact the specification for the trip point accuracy
stated in the Electrical Characteristic for the temperature
range of 40C to +125C, for example, is specified at
±
3C
for the LM56BIM. Note this trip point error specification does
not include any error introduced by the tolerance of the ac-
tual resistors used, nor any error introduced by power supply
variation.
If the resistors have a
±
0.5% tolerance, an additional error of
±
0.4C will be introduced. This error will increase to
±
0.8C
when both external resistors have a
±
1% tolerance.
3.0
TRIP POINT ACCURACY
Bias current for the comparator inputs is 300 nA (max) each,
over the specified temperature range and will not introduce
considerable error if the sum of the resistor values are kept
to about 27 k
as shown in the typical application of Figure
1 . This bias current of one comparator input will not flow if
the temperature is well below the trip point level. As the tem-
perature approaches trip point level the bias current will start
to flow into the resistor network. When the temperature sen-
sor output is equal to the trip point level the bias current will
be 150 nA(max). Once the temperature is well above the trip
point level the bias current will be 300 nA (max). Therefore,
the first trip point will be affected by 150 nA of bias current.
The leakage current is very small when the comparator input
transistor of the different pair is off (see Figure 3) .
The effect of the bias current on the first trip point can be de-
fined by the following equations:
BIAS CURRENT EFFECT ON
where I
B
= 300 nA (the maximum specified error).
The effect of the bias current on the second trip point can be
defined by the following equations:
where I
B
= 300 nA (the maximum specified error).
The closer the two trip points are to each other the more sig-
nificant the error is. Worst case would be when V
T1
= V
T2
=
V
REF
/2.
DS012893-17
FIGURE 2. Single Output Configuration
L
www.national.com
8
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM56BIMMX/NOPB | 功能描述:恒溫器 RoHS:否 制造商:Maxim Integrated 功能: 開路溫度: 閉合溫度: 準確性:+/- 1 C 溫度范圍:- 55 C to + 125 C 電流額定值:500 uA 電壓額定值:2.7 V to 5.5 V 產品:Thermostats |
| LM56BIMX | 功能描述:恒溫器 RoHS:否 制造商:Maxim Integrated 功能: 開路溫度: 閉合溫度: 準確性:+/- 1 C 溫度范圍:- 55 C to + 125 C 電流額定值:500 uA 電壓額定值:2.7 V to 5.5 V 產品:Thermostats |
| LM56BIMX/NAK2 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LM56BIMX/NOPB | 功能描述:恒溫器 RoHS:否 制造商:Maxim Integrated 功能: 開路溫度: 閉合溫度: 準確性:+/- 1 C 溫度范圍:- 55 C to + 125 C 電流額定值:500 uA 電壓額定值:2.7 V to 5.5 V 產品:Thermostats |
| LM56CIM | 功能描述:恒溫器 RoHS:否 制造商:Maxim Integrated 功能: 開路溫度: 閉合溫度: 準確性:+/- 1 C 溫度范圍:- 55 C to + 125 C 電流額定值:500 uA 電壓額定值:2.7 V to 5.5 V 產品:Thermostats |
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