參數(shù)資料
型號(hào)： ADT7518ARQZ-REEL7
廠商： ANALOG DEVICES INC
元件分類(lèi)： 溫度/濕度傳感器
英文描述： SPI/I2C Compatible, Temperature Sensor, 4-Channel ADC and Quad Voltage Output DAC
中文描述： DIGITAL TEMP SENSOR-SERIAL, 10BIT(s), 5Cel, RECTANGULAR, SURFACE MOUNT
封裝： LEAD FREE, MO-137-AB, QSOP-16
文件頁(yè)數(shù)： 35/40頁(yè)
文件大小： 1217K
代理商： ADT7518ARQZ-REEL7
ADT7518
The serial bus protocol operates as follows:
Rev. A | Page 35 of 40
1.
The master initiates a data transfer by establishing a start
condition, defined as a high to low transition on the serial
data line SDA while 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 eight bits, consisting of
a 7-bit address (MSB first) plus an R/W bit, which deter-
mines the direction of the data transfer, i.e., whether data
will be written 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 while the selected device waits for data to be read from
or written to it. If the R/W bit is 0 the master will write to
the slave device. If the R/W bit is 1, the master will read
from the slave device.
2.
Data is sent over the serial bus in sequences of nine clock
pulses: eight 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, since a low to high transition
when the clock is high may be interpreted 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 master device will pull
the data line high during the low period before the ninth
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, and then high during the 10th
clock pulse to assert a stop condition.
Any number of bytes of data can 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 operation is determined at
the beginning and cannot subsequently be changed without
starting a new operation.
The I
2
C address set up by the ADD pin is not latched by the
device until after this address has been sent twice. On the eighth
SCL cycle of the second valid communication, the serial bus
address is latched in. This is the SCL cycle directly after the
device has seen its own I
2
C serial bus address. Any subsequent
changes on this pin will have no effect on the I
2
C serial bus
address.
Writing to the ADT7518
Depending on the register being written to, there are two
different writes for the ADT7518. It is not possible to do a block
write to this part, i.e., no I
2
C autoincrement.
Writing to the Address Pointer Register for a
Subsequent Read
To read data from a particular register, the address 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 56. 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 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 57. To write to a different register,
another start or repeated start is required. If more than one byte
of data is sent in one communication operation, the addressed
register will repeatedly load until the last data byte is sent.
Reading Data from the ADT7518
Reading data from the ADT7518 is done in a 1-byte operation.
Reading back the contents of a register is shown in Figure 58.
The register address had previously been set up by a single-byte
write operation to the address pointer register. To read from
another register, write to the address pointer register again to set
up the relevant register address. Thus, block reads are not
possible, i.e., no I
2
C autoincrement.
SPI Serial Interface
The SPI serial interface of the ADT7518 consists of four wires:
CS, SCLK, DIN, and DOUT. The CS line is used to select the
device when more than one device is connected to the serial
clock and data lines. The CS line is also used to distinguish
between any two separate serial communications (see Figure 63
for a graphical explanation). The SCLK line is used to clock data
in and out of the part. The D
IN
line is used to write to the regis-
ters, and the DOUT line is used to read data back from the
registers. The recommended pull-up resistor value is between
500 and 820 .
The part operates in slave mode and requires an externally
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, read and write. Com-
mand words are used to distinguish read operations from write
operations. These command words are given in Table 59.
Address autoincrement is possible in SPI mode.
Table 59. SPI Command Words
Write
90h (1001 0000)
Read
91h (1001 0001)
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