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參數(shù)資料
| 型號： | DS1620S |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Switch/Digital Output Temperature Sensor |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), 0.50Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | 0.208 INCH, SO-8 |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 167K |
| 代理商： | DS1620S |
Output-Voltage Selection
If SET is connected to a resistive voltage divider (Figure
3), the output voltage is set by the equation:
VOUT = VSET x (R1 + R2) / R1,
where VSET = 1.22V
To simplify resistor selection:
R2 = R1 x (VOUT / VSET - 1)
Since the input bias current at SET has a maximum
value of 10nA, relatively large values can be used for
R1 and R2 with no loss of accuracy. 1M
Ω is a typical
value for R1. The VSET tolerance is less than ±25mV.
This allows the output to be preset without trim pots,
using only fixed resistors in most cases. However, when
resistor values greater than 1M
Ω are used, pay special
attention to printed circuit board leakage that can intro-
duce error at the SET input.
Shutdown (Standby) Mode
SHDN puts the device into standby mode to conserve
power. When this pin is held low, the IC operates nor-
mally. If it is driven above 1.5V, the chip shuts down.
Quiescent current of the MAX667 is then reduced to
less than 1A, and OUT turns off.
Note that the voltage for SHDN must never be more
than 0.3V higher than VIN.
Low-Battery Function
The MAX667 contains circuitry for low-battery detec-
tion. If the voltage at LBI falls below the regulator’s
internal reference (1.22V), LBO, an open-drain output,
sinks current to GND. The threshold can be set to any
level above the reference voltage by connecting a
resistive divider to LBI based on the equation:
R3 = R4 x (VBATT / VLBI - 1)
where VBATT is the desired threshold of the low-battery
detector, and R3 and R4 are the LBI input divider
resistors.
Since LBI input current is no more than 10nA, high val-
ues for R3 and R4 minimize loading. If VOUT is 5V, a
5.5V low-battery threshold can be set using 8.2M
Ω for
R3 and 2.4M
Ω for R4. When resistor values greater
than 1M
Ω are used, pay special attention to PC board
leakage that can introduce error at the LBI input.
When the voltage at LBI is below the internal threshold,
LBO sinks current to GND. A pull-up resistor of 10k
Ω or
more connected to OUT can be used with this pin when
driving CMOS circuits. Any pull-up resistor connected
to LBO should not be returned to a voltage source
greater than VOUT. When LBI is above the threshold or
the MAX667 is in SHDN mode, the LBO output is off.
Dropout Detector
The minimum input-output differential, or dropout volt-
age, determines the regulator’s lowest usable input
voltage. In battery-operated systems, this determines
the useful end-of-life battery voltage. The MAX667 fea-
tures very low dropout voltage (see Electrical
Characteristics). In addition, the MAX667 has a dropout
detector output, DD, that changes as the dropout volt-
age approaches its limit. DD is an open collector of a
PNP transistor. The dropout voltage and the dropout
detector both depend on the output current and tem-
perature. When the input voltage is more than 300mV
above the output voltage, the dropout detector will not
conduct. As the differential decreases below 300mV,
the DD source current increases abruptly. This current
signals a warning that regulation is about to be lost.
Connecting a resistor (typically 100k
Ω) from DD to
ground develops a voltage that can be monitored by
analog circuits or changed to digital levels by a com-
parator. LBI may be used for this purpose.
__________Applications Information
Output Capacitor
As with all PNP output regulators, an output capacitor
(C1, Figure 2) is required to maintain stability. 10F is
recommended. To ensure stability, the output-capacitor
ESR must be sufficiently high. Figure 4 shows the mini-
mum required output-capacitor ESR for a given temper-
ature. Alternatively, a resistor may be added in series
with the output capacitor (Figure 5); the sum of the out-
MAX667
+5V/Programmable Low-Dropout
Voltage Regulator
_______________________________________________________________________________________
5
MAX667
0
-60 -40 -20
0
20
40
60
80 100 120
1
MAX667-Fg
4
TEMPERATURE (C)
MINIMUM
ESR
(Ω
)
2
3
4
5
Figure 4. Minimum Required Output-Capacitor ESR vs.
Temperature
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1620S/T&R | 制造商:Maxim Integrated Products 功能描述:DIGITAL THERM. 8P SO 208M TRL - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER/STAT DIG 8-SOIC |
| DS1620S/T&R | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)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(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| DS1620S+ | 功能描述:板上安裝溫度傳感器 Digital Thermometer & Thermostat RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)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(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| DS1620S+T&R | 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 3-WIRE 8SOIC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER/STAT DIG 8-SOIC 制造商:Maxim Integrated Products 功能描述:Board Mount Temperature Sensors Digital Thermometer & Thermostat |
| DS1620S+T&R/C01 | 制造商:Maxim Integrated Products 功能描述:DIGITAL THERMOMETER AND THERMOSTAT - Tape and Reel |
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