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参数资料
| 型号： | ADT7318ARU |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT |
| 封装： | QSOP-16 |
| 文件页数： | 13/24页 |
| 文件大小： | 279K |
| 代理商： | ADT7318ARU |
–20–
REV. PrH
Preliminary Technical Data
PRELIMINARY TECHNICAL DATA
ADT7316/7317/7318
1. The master initiates data transfer by establishing a
START condition, defined as a high to low transition
on the serial data line SDA whilst the serial clock line
SCL remains high. This indicates that an address/data
stream will follow. All slave peripherals connected to
the serial bus respond to the START condition, and
shift in the next 8 bits, consisting of a 7-bit address
(MSB first) plus a R/
W bit, which determines the direc-
tion of the data transfer, i.e. whether data will be writ-
ten to or read from the slave device.
The peripheral whose address corresponds to the trans-
mitted address responds by pulling the data line low
during the low period before the ninth clock pulse,
known as the Acknowledge Bit. All other devices on the
bus now remain idle whilst the selected device waits for
data to be read from or written to it. If the R/
W bit is a
0 then the master will write to the slave device. If the
R/
W bit is a 1 the master will read from the slave de-
vice.
2. Data is sent over the serial bus in sequences of 9 clock
pulses, 8 bits of data followed by an Acknowledge Bit
from the receiver of data. Transitions on the data line
must occur during the low period of the clock signal
and remain stable during the high period, as a low to
high transition when the clock is high may be inter-
preted as a STOP signal.
3. When all data bytes have been read or written, stop
conditions are established. In WRITE mode, the master
will pull the data line high during the 10th clock pulse
to assert a STOP condition. In READ mode, the mas-
ter device will pull the data line high during the low
period before the 9th clock pulse. This is known as No
Acknowledge. The master will then take the data line
low during the low period before the 10th clock pulse,
then high during the 10th clock pulse to assert a STOP
condition.
Any number of bytes of data may be transferred over the
serial bus in one operation, but it is not possible to mix
read and write in one operation, because the type of opera-
tion is determined at the beginning and cannot subse-
quently be changed without starting a new operation.
WRITING TO THE ADT7316/7317/7318
Depending on the register being written to, there are three
different writes for the ADT7316/7317/7318.
Writing to the Address Pointer Register for a subsequent
read.
In order to read data from a particular register, the Ad-
dress Pointer Register must contain the address of that
register. If it does not, the correct address must be written
to the Address Pointer Register by performing a single-
byte write operation, as shown in Figure x. The write
operation consists of the serial bus address followed by the
address pointer byte. No data is written to any of the data
registers. A read operation is then performed to read the
register.
Writing a single byte of data to a Register.
All registers are 8-bit registers so only one byte of data
can be written to each register. Writing a single byte of
data to one of these Read/Write registers consists of the
serial bus address, the data register address written to the
Address Pointer Register, followed by the data byte written
to the selected data register. This is illustrated in Figure
x.
Writing multiple bytes of data to Registers in sequence
In order to write multiple bytes of data in one write opera-
tion the AI bit in Configuration 2 Register must be set to
1. This particular write operation allows data to be written
to registers with sequential addresses without having to
load the Address Pointer Register each time a register is
being written to. The write operation consists of the serial
bus address, the address of the first register to be written
to, followed by the data bytes for each register, as shown
in Figure xx. After each register has been loaded with it’s
data byte, the Address Pointer register increments until all
input data bytes have been loaded or until it reaches the
last read/write register in Table xx, DAC D Low Regis-
ter. The Address Pointer Register will not loop around to
the top of the Register Table.
READING DATA FROM THE ADT7316/7317/7318
Reading data from the ADT7316/7317/7318 can be done
in at least a one byte operation and up to a maximum of a
Figure xx. I2C - Reading Temperature Value from DAC A High Register and DAC A Low Register
R/
9
1
SCL
SDA
00
1
A2
A1
A0
D15
D14
D13
D 12
D10
D11
D9
D8
ACK. BY
MASTER
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
DATA BYTE FROM ADT7316/17 DAC A HIGH REGISTER
19
1
ACK. BY
ADT7316/17
9
D7
D6
D5
D4
D3
D2
D1
D0
NO ACK. BY
MASTER
STOP BY
MASTER
FRAME 3
DATA BYTE FROM ADT7316/17 DA C A LOW REGISTER
19
SCL (CONTINUED)
SDA (CONTINUED)
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| ADT7320UCPZ-R2 | 功能描述:板上安装温度传感器 +/-0.25C accurate SPI Temperature Sensor 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 |
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