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參數(shù)資料
| 型號： | MAX1989MEE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Multichannel Remote/Local Temperature Sensors |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | 0.150 INCH, QSOP-16 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大小： | 285K |
| 代理商： | MAX1989MEE |
sion cycle is truncated, and the data from that conversion
is not latched into either temperature-reading register. The
previous data is not changed and remains available.
In standby mode, supply current drops to about 3μA.
At very low supply voltages (under the power-on-reset
threshold), the supply current is higher due to the
address pin bias currents. It can be as high as 100μA,
depending on ADD0 and ADD1 settings.
SMBus Digital Interface
From a software perspective, the MAX1668/MAX1805/
MAX1989 appear as a set of byte-wide registers that
contain temperature data, alarm threshold values, or
control bits. A standard SMBus 2-wire serial interface is
used to read temperature data and write control bits and
alarm threshold data. Each A/D channel within the
devices responds to the same SMBus slave address for
normal reads and writes.
The MAX1668/MAX1805/MAX1989 employ four standard
SMBus protocols: write byte, read byte, send byte, and
receive byte (Figure 3). The shorter receive byte protocol
allows quicker transfers, provided that the correct data
register was previously selected by a read byte instruc-
tion. Use caution with the shorter protocols in multimaster
systems, since a second master could overwrite the com-
mand byte without informing the first master.
The temperature data format is 7 bits plus sign in two’s-com-
plement form for each channel, with each data bit represent-
ing 1°C (Table 2), transmitted MSB first. Measurements are
offset by +0.5°C to minimize internal rounding errors; for
example, +99.6°C is reported as +100°C.
Alarm Threshold Registers
Ten (six for MAX1805) registers store alarm threshold
data, with high-temperature (T
HIGH
) and low-tempera-
ture (T
LOW
) registers for each A/D channel. If either
measured temperature equals or exceeds the corre-
sponding alarm threshold value, an
ALERT
interrupt is
asserted.
The power-on-reset (POR) state of all T
HIGH
registers of
the MAX1668 and MAX1805 is full scale (0111 1111, or
+127°C). The POR state of the channel 1 T
HIGH
register
of the MAX1989 is 0110 1110 or +110°C, while all other
channels are at +127°C. The POR state of all T
LOW
reg-
isters is 1100 1001 or -55°C.
M
Multichannel Remote/Local
Temperature Sensors
10
______________________________________________________________________________________
ACK
7 bits
ADDRESS
ACK
WR
8 bits
DATA
ACK
1
P
8 bits
S
COMMAND
Write Byte Format
Read Byte Format
Send Byte Format
Receive Byte Format
Slave Address: equiva-
lent to chip-select line of
a 3-wire interface
Command Byte: selects which
register you are writing to
Data Byte: data goes into the register
set by the command byte (to set
thresholds, configuration masks, and
sampling rate)
ACK
7 bits
ADDRESS
ACK
WR
S
ACK
8 bits
DATA
7 bits
ADDRESS
RD
8 bits
///
P
S
COMMAND
Slave Address: equiva-
lent to chip-select line
Command Byte: selects
which register you are
reading from
Slave Address: repeated
due to change in data-
flow direction
Data Byte: reads from
the register set by the
command byte
ACK
7 bits
ADDRESS
WR
8 bits
COMMAND
ACK
P
S
ACK
7 bits
ADDRESS
RD
8 bits
DATA
///
P
S
Command Byte: sends com-
mand with no data
Data Byte: This command only
works immediately following a
Read Byte. Reads data from the
register commanded by that last
Read Byte; also used for SMBus
Alert Response return address
S = Start condition
P = Stop condition
Shaded = Slave transmission
/// = Not acknowledged
Figure 3. SMBus Protocols
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1668 | Multichannel Remote/Local Temperature Sensors |
| MAX1668MEE | Multichannel Remote/Local Temperature Sensors |
| MAX1989MUE | Multichannel Remote/Local Temperature Sensors |
| MAX167AENG | CMOS 12-Bit A/D Converters With Track-and-Hold |
| MAX167BCNG | CMOS 12-Bit A/D Converters With Track-and-Hold |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1989MEE/GG8 | 制造商:Maxim Integrated Products 功能描述:MULTICHANNEL REMOTE/LOCAL TEMPERATURE SENSOR - Rail/Tube |
| MAX1989MEE+ | 功能描述:板上安裝溫度傳感器 MultiCh Remote Local Sensor 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 |
| MAX1989MEE+T | 功能描述:板上安裝溫度傳感器 MultiCh Remote Local Sensor 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 |
| MAX1989MEE-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 |
| MAX1989MEE-TG11 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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