- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44572 > LM79CCVFX (NATIONAL SEMICONDUCTOR CORP) SPECIALTY ANALOG CIRCUIT, PQFP44 PDF資料下載
參數(shù)資料
| 型號： | LM79CCVFX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP44 |
| 封裝： | 10 X 10 MM, PLASTIC, QFP-44 |
| 文件頁數(shù)： | 13/31頁 |
| 文件大?。?/td> | 469K |
| 代理商： | LM79CCVFX |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁當(dāng)前第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁
Functional Description (Continued)
7.0 TEMPERATURE MEASUREMENT SYSTEM
The LM79 bandgap type temperature sensor and ADC per-
form 8-bit two’s-complement conversions of the tempera-
ture. A digital comparator is also incorporated that compares
the readings to the user-programmable Overtemperature
setpoint and Hysteresis values.
7.1 Temperature Data Format
Temperature data can be read from the Temperature, T
OI Set
Point, and T
HYST Set Point registers; and written to the TOI
Set Point, and T
HYST Set Point registers. Temperature data
is represented by an 8-bit, two’s complement word with an
LSB (Least Significant Bit) equal to 1.0C:
Temperature
Digital Output
Binary
Hex
+125C
0111 1101
7Dh
+25C
0001 1001
19h
+1.0C
0000 0001
01h
+0C
0000 0000
00h
1.0C
1111 1111
FFh
25C
1110 0111
E7h
55C
1100 1001
C9h
7.2 Temperature Interrupts
The normal mode for temperature interrupts in the LM79 is
an “Interrupt” mode operating in the following way: Exceed-
ing T
OI causes an interrupt that will remain active indefinitely
until reset by reading Interrupt Status Register 1. Once an in-
terrupt event has occurred by crossing T
OI, then reset, an in-
terrupt will only occur again by the temperature going below
T
HYST. Again, it will remain active indefinitely until being re-
set by reading Interrupt Status Register 1.
A “Comparator” mode for temperature interrupts can be
made available by setting the T
HYST limit to 127C. This re-
sults in a simple “thermostat” type of function where an inter-
rupt will be set whenever the temperature exceeds the T
OI
limit. Reading Interrupt Status Register 1 will clear the inter-
rupt as usual, but the interrupt will set again after the comple-
tion of another measurement cycle. It will remain set until the
temperature goes below the T
OI limit (allow up to two mea-
surement cycles for clearing after descending below T
OI
while in Comparator mode).
DS100036-18
FIGURE 10. Temperature-to-Digital Transfer Function
(Non-Linear Scale for Clarity)
DS100036-19
*Note: Interrupt resets occur only when interrupt Status Register 1 is read.
(a) Interrupt Mode
DS100036-20
Interrupt resets occur when Interrupt Status Register 1 is read but will set
again when monitoring cycle continues (as long as temperature exceeds
TOI). When temperature descends below TOI allow up to two monitoring
loops before the Temperature Interrupt resets.
(b) Comparator Mode
FIGURE 11. Temperature Interrupt Response Diagram
LM79
www.national.com
20
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM86BIMQX | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| LM85BIMQ/NOPB | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| LM9140BYZ-5.0X | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, PBCY3 |
| LM9140BYZ-4.1X | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 4.096 V, PBCY3 |
| LM9140BYZ-5.0 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, PBCY3 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM79GCP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Negative Adjustable Voltage Regulator |
| LM79L | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3-Terminal Negative Regulators |
| LM79L00 | 制造商:FCI 制造商全稱:First Components International 功能描述:LM79L00 Series 3-Terminal Negative Output voltage Regulators |
| LM79L05 | 制造商:KEXIN 制造商全稱:Guangdong Kexin Industrial Co.,Ltd 功能描述:Three-terminal negative voltage regulator |
| LM79L05A | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:3-Terminal 0.1A Negative Voltage Regulator |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。