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參數(shù)資料
| 型號： | MAX1618 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Remote Temperature Sensor with SMBus Serial Interface |
| 中文描述： | 遠(yuǎn)程溫度傳感器，帶有SMBus串行接口 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 430K |
| 代理商： | MAX1618 |
Low-Power Standby Mode
Standby mode disables the ADC and reduces the sup-
ply-current drain to 3μA (typ). Enter standby mode by
forcing the
STBY
pin low or via the RUN/STOP bit in the
configuration byte register. Hardware and software
standby modes behave almost identically; all data is
retained in memory, and the SMB interface is alive and
listening for reads and writes. The only difference is that
in hardware standby mode, the one-shot command
does not initiate a conversion.
Standby mode is not a shutdown mode. Activity on the
SMBus draws extra supply current (see
Typical
Operating Characteristics
). In software standby mode,
the MAX1618 can be forced to perform A/D conversions
through the one-shot command, despite the RUN/STOP
bit being high.
Enter hardware standby mode by forcing the
STBY
pin
low. In a notebook computer, this line may be connect-
ed to the system SUSTAT# suspend-state signal.
The
STBY
pin low state overrides any software conver-
sion command. If a hardware or software standby com-
mand is received while a conversion is in progress, the
conversion cycle is truncated, and the data from that
conversion is not latched into either temperature read-
ing register. The previous data is not changed and
remains available.
Supply-current drain during the 62ms conversion period
is always about 450μA. Between conversions, the
instantaneous supply current is about 25μA due to the
current consumed by the conversion rate timer. In
standby mode, supply current drops to about 3μA. With
very low supply voltages (under the power-on reset
threshold), the supply current is higher due to the
address input bias currents. It can be as high as 160μA,
depending on ADD0 and ADD1 settings.
SMBus Digital Interface
From a software perspective, the MAX1618 appears as a
set of byte-wide registers that contains temperature data,
alarm threshold values, or control bits. Use a standard
SMBus 2-wire serial interface to read temperature data
and write control bits and alarm threshold data.
The MAX1618 employs four standard SMBus protocols:
Write Byte, Read Byte, Send Byte, and Receive Byte
(Figure 2). The two shorter protocols (Receive and Send)
allow quicker transfers, provided that the correct data
register was previously selected by a Write or Read Byte
instruction. Use caution with the shorter protocols
in multimaster systems, since a second master could
overwrite the command byte without informing the first
master.
The temperature data format is 7 bits plus sign in two’s
complement form for each channel, with each data bit
representing +1°C (Table 1), transmitted MSB first.
Measurements are offset by +1/2°C to minimize internal
rounding errors; for example, +99.6°C is reported as
+100°C.
Alarm Threshold Registers
Two registers, a high-temperature (T
HIGH
) and a low-
temperature (T
LOW
) register, store alarm threshold
data. If a measured temperature equals or exceeds the
corresponding alarm threshold value, an
ALERT
inter-
rupt is asserted.
The power-on reset (POR) state of the T
HIGH
register is
full scale (0111 1111 or +127°C). The POR state of the
T
LOW
register is 1100 1001 or -55°C.
Thermostat Mode
Thermostat mode changes the function of the
ALERT
output from a latched interrupt-type output to a self-
clearing thermostat for fan control. This output simply
responds to the current temperature (Figure 3). If the
current temperature is above T
HIGH
,
ALERT
activates
M
Remote Temperature Sensor
with SMBus Serial Interface
8
_______________________________________________________________________________________
Table 1. Data Format (Two
’
s Complement)
DIGITAL OUTPUT
DATA BITS
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
111
111
111
001
000
000
000
000
000
111
111
110
110
100
100
011
011
1111
1111
1111
1001
0001
0000
0000
0000
0000
1111
1111
0111
0111
1001
1001
1111
1111
+127
+127
+127.00
+126.50
+126
+25
+126.00
+25.25
+1
0
+0.50
+0.25
0
0
0.00
-0.25
ROUNDED
TEMP.
(
°
C)
TEMP.
(
°
C)
0
-1
-0.50
-0.75
-1
-25
-1.00
-25.00
-25
-55
-25.50
-54.75
-55
-65
-55.00
-65.00
-65
-70.00
SIGN
0
MSB
111
LSB
1111
+127
+130.00
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1618EVKIT | 制造商:Maxim Integrated Products 功能描述:REMOTE TEMPERATURE SENSOR WITH SMBUS SERIAL I - Bulk |
| MAX1618MUB | 功能描述:板上安裝溫度傳感器 Sensors, Transducers 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 |
| MAX1618MUB+ | 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 |
| MAX1618MUB+T | 功能描述:板上安裝溫度傳感器 Sensors, Transducers 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 |
| MAX1618MUB-T | 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 |
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