- 您现在的位置：买卖IC网 > PDF目录19603 > MAX31826MUA+ (Maxim Integrated)IC TEMP SENSOR DIGITAL 8UMAX PDF资料下载
参数资料
| 型号： | MAX31826MUA+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/22页 |
| 文件大小： | 1648K |
| 描述： | IC TEMP SENSOR DIGITAL 8UMAX |
| 标准包装： | 50 |
| 系列： | 1-Wire® |
| 功能： | 温度监控系统（传感器） |
| 传感器类型： | 内部 |
| 感应温度： | -55°C ~ 125°C |
| 精确度： | ±2°C |
| 拓扑： | 寄存器库，变签式暂存器 |
| 输出类型： | 1-Wire? |
| 输出警报： | 无 |
| 输出风扇： | 无 |
| 电源电压： | 3 V ~ 3.7 V |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 管件 |
? Maxim Integrated Products 7
MAX31826
1-Wire Digital Temperature Sensor
with 1Kb Lockable EEPROM
Powering the MAX31826
The MAX31826 can be powered by an external supply
on the V
DD
pin, or it can operate in parasite power
mode, which allows the device to function without a local
external supply. Parasite power is useful for applications
that require remote temperature sensing or those that
are very space-constrained. Figure 1 shows the devices
parasite-power control circuitry, which steals power
from the 1-Wire bus through DQ when the bus is high.
The stolen charge powers the device while the bus is
high, and some of the charge is stored on the parasite-
power capacitor (C
PP
) to provide power when the bus is
low. When the device is used in parasite-power mode,
V
DD
must be connected to ground.
In parasite-power mode, the 1-Wire bus and C
PP
can pro-
vide sufficient current to the device for most operations
as long as the specified timing and voltage requirements
are met (see the DC Electrical Characteristics and the
AC Electrical Characteristics tables). However, when the
device is performing temperature conversions or copy-
ing data from the Scratchpad 2 memory to EEPROM, the
operating current can be as high as 1.5mA. This current
can cause an unacceptable voltage drop across the
weak 1-Wire pullup resistor and is more current than can
be supplied by C
PP
. To ensure that the device has suf-
ficient supply current, it is necessary to provide a strong
pullup on the 1-Wire bus whenever temperature conver-
sions are taking place or when data is being copied from
the Scratchpad 2 to EEPROM. This can be accomplished
by using a MOSFET to pull the bus directly to the rail as
shown in Figure 1. The 1-Wire bus must be switched to
the strong pullup within 10Fs (max) after a Convert T or
Copy Scratchpad 2 command is issued, and the bus
must be held high by the pullup for the duration of the
conversion (t
CONV
) or the duration of the EEPROM write
(t
WR
). No other activity can take place on the 1-Wire bus
while the pullup is enabled.
The device can also be powered by the conventional
method of connecting an external power supply to V
DD
,
as shown in Figure 2. The advantage of this method is
that the MOSFET pullup is not required, and the 1-Wire
bus is free to carry other traffic during the temperature
conversion period or EEPROM write time.
The use of parasite power is not recommended for tem-
peratures above 100NC because the device may not be
able to sustain communications due to the higher leak-
age currents that can exist at these temperatures. For
applications in which such temperatures are likely, it is
strongly recommended that the device be powered by
an external power supply.
In some situations the bus master might not know whether
the devices on the bus are parasite powered or powered
by external supplies. The master needs this information
to determine if the strong bus pullup should be used dur-
ing temperature conversions. To get this information, the
master can issue a Skip ROM command, followed by a
Read Power Supply command, followed by a read time
slot. During the read time slot, parasite-powered devices
pull the bus low, and externally powered devices let the
bus remain high. If the bus is pulled low, the master
knows that it must supply the strong pullup on the 1-Wire
bus during temperature conversions or EEPROM writes.
Table 1. Temperature/Data Relationship
TEMPERATURE (NC)
DIGITAL OUTPUT (BINARY)
DIGITAL OUTPUT (HEX)
+125
0000 0111 1101 0000
07D0h
+85
0000 0101 0101 0000
0550h
+25.0625
0000 0001 1001 0001
0191h
+10.125
0000 0000 1010 0010
00A2h
+0.5
0000 0000 0000 1000
0008h
0
0000 0000 0000 0000
0000h
-0.5
1111 1111 1111 1000
FFF8h
-10.125
1111 1111 0101 1110
FF5Eh
-25.0625
1111 1110 0110 1111
FE6Fh
-55
1111 1100 1001 0000
FC90h
相关PDF资料 |
PDF描述 |
|---|---|
| VI-21Z-CX-F1 | CONVERTER MOD DC/DC 2V 30W |
| 180-062-213R021 | CONN DB62 FEML HD DIP SLD NICKEL |
| EZ312-8AP | BATTERY COIN ZINC AIR 1.4V 8PK |
| HWS150-24/HD | PWR SUP IND 24V 156W 6.5A |
| ABC43DREF-S734 | CONN EDGECARD 86POS .100 EYELET |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX31826MUA+ | 功能描述:板上安装温度传感器 1-Wire w/ 1Kbit EEPROM RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| MAX31826MUA+T | 功能描述:板上安装温度传感器 1-Wire w/ 1Kbit EEPROM RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| MAX3182EEUK | 制造商:Maxim Integrated Products 功能描述:+-15KV ESD-PROTECTED 0.5MA +3V TO - Rail/Tube |
| MAX3182EEUK+ | 制造商:Maxim Integrated Products 功能描述:LINE RCVR 1RX 5PIN SOT-23 - Rail/Tube 制造商:Maxim Integrated Products 功能描述:Single Receiver RS-232 5-Pin SOT-23 Bulk |
| MAX3182EEUK+T | 功能描述:RS-232接口集成电路 .5uA 3-5.5V 1.5Mbps RS-232 Rcvr RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
发布紧急采购，3分钟左右您将得到回复。