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參數(shù)資料
| 型號(hào)： | MAX6688AU75L+T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | Local/Remote Temperature Switches in a µMAX Package |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | 3 X 3 MM, ROHS COMPLIANT, MO-187C-AA, MICRO MAX PACKAGE-8 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 471K |
| 代理商： | MAX6688AU75L+T |
Applications Information
Remote-Diode selection
The MAX6687/MAX6688 are optimized to measure the
die temperature of CPUs and other ICs that have on-
chip temperature-sensing diodes. These on-chip
diodes are substrate PNPs with their collectors ground-
ed. Connect the base of the PNP to DXN and the emit-
ter to DXP. When using a discrete, diode-connected
NPN or PNP as a sensing diode, use a good-quality
small-signal device. Examples are listed in Table 2.
Tight specifications for forward current gain indicate
the manufacturer has good process controls and that
the devices have consistent VBE characteristics.
Always use a transistor for the sensing junction; diodes
do not work.
The MAX6687/MAX6688 are optimized for use with
thermal-sensing transistors with an ideality factor of
1.008. Different ideality factors cause predictable, usu-
ally small deviations in trip temperature thresholds.
Noise-Filtering Capacitors
A quality ceramic capacitor must be connected across
the DXP/DXN inputs to maintain temperature threshold
accuracy by filtering out noise. The capacitor should be
located physically close to the DXP/DXN pins and
should typically have a value of 2200pF. Larger capaci-
tor values can cause temperature measurement errors.
A 50% increase from the recommended capacitor
value can cause up to ±1°C error.
Sensing Circuit Board and
Ambient Temperature
Temperature switches like the MAX6687/MAX6688 that
sense their own die (local) temperatures must be
mounted on or close to the object whose temperature
they are intended to measure. The MAX6687/MAX6688
can accurately measure the temperature of a circuit
board to which they are soldered because the package
leads provide a good thermal path between the circuit
board and their own die. If the MAX6687/MAX6688 are
intended to be triggered by the temperature of a heat-
generating component on the circuit board, they should
be mounted as close as possible to that component
and should share supply and ground traces (if they are
not noisy) with that component where possible. The
thermal path between the plastic package and the die
is not as good as the path through the package leads,
so the MAX6687/MAX6688 are less sensitive to the sur-
rounding air temperature than they are to the tempera-
ture of their package leads, but they can be
successfully used to respond to the ambient tempera-
ture if the circuit board is designed to track the ambient
temperature.
Chip Information
TRANSISTOR COUNT: 7765
PROCESS: BiCMOS
MAX6687/MAX6688
Local/Remote Temperature Switches in a
MAX Package
_______________________________________________________________________________________
5
MAX6687AUA40L/MAX6687AUA40H/
MAX6688AUA40L/MAX6688AUA40H
MAX6687AUA75L/MAX6687AUA75H/
MAX6688AUA75L/MAX6688AUA75H
S1
S2
LOCALTEMPERATURE TRIP THRESHOLD (
°C)
LOCAL TEMPERATURE TRIP THRESHOLD (
°C)
GND
+40
+75
GND
FLOAT
+45
+80
GND
VDD
+50
+85
FLOAT
GND
+55
+90
FLOAT
+60
+95
FLOAT
VDD
+65
+100
VDD
GND
+70
+105
VDD
FLOAT
+75
+110
VDD
+80
+115
Table 1. Local Temperature Trip Threshold Selection
MANUFACTURER
MODEL NO.
Central Semiconductor (USA)
CMPT3904
Rohm Semiconductor (Japan)
SST3904
Samsung (Korea)
KST3904-TF
Siemens (Germany)
SMBT3904
Table 2. Sensor Transistor Manufacturers
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX6689UP9A+T | 7-Channel Precision Temperature Monitor |
| MAX668EUB+ | 1.8V to 28V Input, PWM Step-Up Controllers in µMAX |
| MAX668EUB+T | 1.8V to 28V Input, PWM Step-Up Controllers in µMAX |
| MAX669EUB+ | 1.8V to 28V Input, PWM Step-Up Controllers in µMAX |
| MAX669EUB+T | 1.8V to 28V Input, PWM Step-Up Controllers in µMAX |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6688UA40L | 制造商:Maxim Integrated Products 功能描述:LOCAL/REMOTE TEMPERATURE SWITCH IN A UMAX PAC - Rail/Tube |
| MAX6688UA75H | 制造商:Maxim Integrated Products 功能描述:LOCAL/REMOTE TEMPERATURE SWITCH IN A UMAX PAC - Rail/Tube |
| MAX6689EP34 | 制造商:Maxim Integrated Products 功能描述:7-CHANNEL PRECISION TEMPERATURE MONITOR - Rail/Tube |
| MAX6689EP34-T | 制造商:Maxim Integrated Products 功能描述:7-CHANNEL PRECISION TEMPERATURE MONITOR - Tape and Reel |
| MAX6689EP38 | 制造商:Maxim Integrated Products 功能描述:7-CHANNEL PRECISION TEMPERATURE MONITOR - Rail/Tube |
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