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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： | 14/24页 |
| 文件大小： | 279K |
| 代理商： | ADT7318ARU |
ADT7316/7317/7318
–21–
REV. PrH
Preliminary Technical Data
PRELIMINARY TECHNICAL DATA
xx byte operation. Reading back the contents of the one
register is a single byte read operation as shown in Figure
x. The register address previously having been set up by a
single byte write operation to the Address Pointer Regis-
ter. If the AI bit in Configuration 2 Register is set to 0
and once the register address has been set up, any number
of reads can be subsequently done from that register with-
out having to write to the Address Pointer Register again.
If you want to read from another register then you will
have to write to the Address Pointer Register again to set
up the relevant register address.
If the AI bit is set to 1 then it is possible to read data from
a number of registers whose addresses are in sequence. A
two byte read operation is shown in Figure x. The same
rules apply for a two byte read as a single byte read except
that the Address Pointer Register is incremented after each
register is read.
SMBUS ALERT
The ADT7316/7317/7318 ALERT output is an SMBus
interrupt line for devices that want to trade their ability to
master for an extra pin. The ADT7316/7317/7318 is a
slave only device and uses the SMBUS ALERT to signal
the host device that it wants to talk. The SMBUS ALERT
on the ADT7316/7317/7318 is used as an over tempera-
ture indicator.
The ALERT pin has an open-drain configuration which
allows the ALERT outputs of several I
2C devices to be
wired-AND together when the ALERT pin is active low.
Use D4 of the Configuration 2 Register to set the active
polarity of the ALERT output. The power-up default is
active low. The ALERT function can be disabled or en-
abled by setting D7 of Configuration 1 Register to a 1 or
0 respectively.
The host device can process the ALERT interrupt and
simultaneously access all SMBUS ALERT devices
through the alert response address. Only the device which
pulled the ALERT low will acknowledge the ARA (Alert
Response Address). If more than one device pulls the
ALERT pin low, the highest priority (lowest address)
device will win communication rights via standard I
2C
arbitration during the slave address transfer.
MASTER
RECEIVES
SMBALERT
MASTER SENDS ARA AND
READ COMMAN D
DEVICE SENDS
IT’S ADDRESS
Figure xx. Use of
SMBALERT
1.
SMBALERT pulled low
2.Master initiates a read operation and sends the Alert
Response Address (ARA = 0001 100). This is a general
call address that must not be used as a specific device
address.
3. The device whose
ALERT output is low responds to
the Alert Response Address and the master reads it’s de-
vice address.
4. Once the ADT7316/17/18 responds to the ARA, it will
reset it’s
ALERT output, provided that the error condition
that caused the
ALERT no longer exists. If the
SMBALERT line remains low, the master will resend the
ARA again and so on until all devices whose
ALERT out-
puts were low have responded.
The ALERT output becomes active when the value in the
Temperature Value Register exceeds the value in the
THIGH Register. It is reset when a write operation to the
Configuration 2 Register sets D3 to a 1 or when the tem-
perature falls below the value stored in the TLOW Register.
The ALERT output requires an external pull-up resistor.
This can be connected to a voltage different from VDD
provided the maximum voltage rating of the ALERT out-
put pin is not exceeded. The value of the pull-up resistor
depends on the application, but should be as large as pos-
sible to avoid excessive sink currents at the ALERT out-
put, which can heat the chip and affect the temperature
reading.
SPI SERIAL INTERFACE
The SPI serial interface of the ADT7316/7317/7318 con-
sists of four wires,
CS, SCLK, DIN and DOUT. The CS
is used to select the device when more than one device is
connected to the serial clock and data lines. The SCLK is
used to clock data in and out of the part. The DIN line is
used to write to the registers and the DOUT line is used
to read data back from the registers.
The part operates in a slave mode and requires an exter-
nally applied serial clock to the SCLK input. The serial
interface is designed to allow the part to be interfaced to
systems that provide a serial clock that is synchronized to
the serial data.
There are two types of serial operations, a read and a
write. Command words are used to distinguish between a
read and a write operation. These command words are
given in Table xx.
Table xx. SPI COMMAND WORDS
WRITE
READ
90h (1001 0000)
91h (1001 0001)
92h (1001 0010)
93h (1001 0011)
94h (1001 0100)
95h (1001 0101)
Write Operation
Figure xx. shows the timing diagram for a write operation
to the ADT7316/7317/7318. Data is clocked into the
registers on the rising edge of SCLK. When the
CS line is
high the DIN and DOUT lines are in three-state mode.
Only when the
CS goes from a high to a low does the part
accept any data on the DIN line. If the Address Pointer
Register has it’s auto-increment enabled then from Figure
xx. the register address gives the first register that will be
written to. Subsequent data bytes will be written into se-
quential writable registers. Thus after each data byte has
been written into a register, the Address Pointer Register
auto increments it’s value to the next available register. If
the auto-increment is disabled and more than one data
byte has been sent to the part in the write operation then
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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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