参数资料
| 型号： | ADT7473ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/73页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADT7473 |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 系列： | dBCool® |
| 类型： | 温度传感器 |
| 适用于相关产品： | ADT7473 |
| 所含物品： | 评估板 |
| 其它名称： | EVAL-ADT7473EBZ EVAL-ADT7473EBZ-ND |
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ADT7473
NC
ADT7473 ? 1
ADDR SELECT
PWM3/
ADDREN
V CC
10 k W
4
8
DO NOT LEAVE ADDREN
UNCONNECTED! CAN CAUSE
UNPREDICTABLE ADDRESSES.
data from it, the address pointer register must be set so the
correct data register is addressed, and then data can be
written into that register or read from it. The first byte of a
write operation always contains an address that is stored in
the address pointer register. If data is written to the device,
the write operation contains a second data byte that is written
to the register selected by the address pointer register.
This write operation is shown in Figure 17. The device
address is sent over the bus, and then R/W is set to 0. This
CARE SHOULD BE TAKEN TO ENSURE THAT PIN 8
(PWM3/ADDREN) IS EITHER TIED HIGH OR LOW. LEAVING PIN 8
FLOATING COULD CAUSE THE ADT7473 ? 1 TO POWER UP WITH
AN UNEXPECTED ADDRESS.
NOTE THAT IF THE ADT7473 ? 1 IS PLACED INTO ADDR SELECT
MODE, PINS 8 AND 4 CAN BE USED AS THE ALTERNATE
FUNCTIONS (PWM3, TACH4/THERM) UNLESS THE CORRECT
CIRCUIT IS MUXED IN AT THE CORRECT TIME OR DESIGNED
TO HANDLE THESE DUAL FUNCTIONS.
Figure 16. Unpredictable SMBus Address if Pin 8
is Unconnected
The ability to make hardwired changes to the SMBus
slave address allows the user to avoid conflicts with other
devices sharing the same serial bus, for example, if more
than one ADT7473 ? 1 is used in a system.
Data is sent over the serial bus in sequences of nine clock
pulses: eight bits of data followed by an acknowledge bit
from the slave device. Transitions on the data line must
occur during the low period of the clock signal and remain
stable during the high period because a low-to-high
transition when the clock is high might be interpreted as a
stop signal. The number of data bytes that can be transmitted
over the serial bus in a single read or write operation is
limited only by what the master and slave devices can
handle.
When all data bytes have been read or written, stop
conditions are established. In write mode, the master pulls
the data line high during the tenth clock pulse to assert a stop
condition. In read mode, the master device overrides the
acknowledge bit by pulling the data line high during the low
period before the ninth clock pulse; this is known as No
Acknowledge. The master takes the data line low during the
low period before the tenth clock pulse, and then high during
the tenth 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.
In the ADT7473/ADT7473 ? 1, write operations contain
either one or two bytes, and read operations contain one
byte. To write data to one of the device data registers or read
is followed by two data bytes. The first data byte is the
address of the internal data register to be written to, which
is stored in the address pointer register. The second data byte
is the data to be written to the internal data register.
When reading data from a register, there are two
possibilities:
1. If the ADT7473/ADT7473 ? 1’s address pointer
register value is unknown or not the desired value,
it must first be set to the correct value before data
can be read from the desired data register. This is
done by performing a write to the
ADT7473/ADT7473 ? 1, but only the data byte
containing the register address is sent, because no
data is written to the register. This is shown in
Figure 18.
A read operation is then performed consisting of
the serial bus address, R/W bit set to 1, followed
by the data byte read from the data register. This is
shown in Figure 19.
2. If the address pointer register is known to be
already at the desired address, data can be read
from the corresponding data register without first
writing to the address pointer register, as shown in
Figure 19.
It is possible to read a data byte from a data register
without first writing to the address pointer register, if the
address pointer register is already at the correct value.
However, it is not possible to write data to a register without
writing to the address pointer register, because the first data
byte of a write is always written to the address pointer
register.
In addition to supporting the send byte and receive byte
protocols, the ADT7473/ADT7473 ? 1 also supports the read
byte protocol. (See System Management Bus (SMBus)
Specifications Version 2 for more information; this
document is available from Intel.)
If several read or write operations must be performed in
succession, the master can send a repeat start condition
instead of a stop condition to begin a new operation.
http://onsemi.com
10
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| ADT7475ARQZ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 16QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:dBCool® 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
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