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| 型号： | ADT7490ARQZ-REEL |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/75页 |
| 文件大小： | 0K |
| 描述： | IC THERM MON FAN CTLR 24QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi QSOP 24ld Pkg (MSL) Change 17/Jun/2010 |
| 标准包装： | 2,500 |
| 系列： | dBCool® |
| 功能： | 风扇控制，温度监控器 |
| 传感器类型： | 内部和外部 |
| 感应温度： | -40°C ~ 125°C |
| 精确度： | ±1.5°C（最小值） |
| 拓扑： | ADC，比较器，风扇速度计数器，多路复用器，寄存器库 |
| 输出类型： | SMBus? |
| 输出警报： | 无 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 带卷 (TR) |
| 其它名称： | ADT7490ARQZ-REEL-ND ADT7490ARQZ-REELOSTR |
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ADT7490
For the ADT7490, the send byte protocol is used to write
1
2
3
4
5 6
S ADDRESS R A
a register address to RAM for a subsequent single-byte read
from the same address. This operation is illustrated in
SLAVE
DATA
A P
Figure 21.
Figure 23. Single-byte Read from a Register
1
2
3
4
5 6
S
SLAVE
ADDRESS
W A
REGISTER
ADDRESS
A P
Alert Response Address
Alert response address (ARA) is a feature of SMBus
Figure 21. Setting a Register Address for
Subsequent Read
If the master is required to read data from the register
immediately after setting up the address, it can assert a repeat
start condition immediately after the final ACK and carry
out a single-byte read without asserting an intermediate stop
condition.
Write Byte
In this operation, the master device sends a command byte
and one data byte to the slave device, as follows:
1. The master device asserts a start condition on SDA.
2. The master sends the 7-bit slave address followed
by the write bit (low).
3. The addressed slave device asserts ACK on SDA.
4. The master sends a command code.
5. The slave asserts ACK on SDA.
6. The master sends a data byte.
7. The slave asserts ACK on SDA.
8. The master asserts a stop condition on SDA, and
the transaction ends.
The byte write operation is illustrated in Figure 22.
devices that allows an interrupting device to identify itself
to the host when multiple devices exist on the same bus.
The SMBALERT output can be used as either an interrupt
output or an SMBALERT. One or more outputs can be
connected to a common SMBALERT line connected to the
master. If a device’s SMBALERT line goes low, the
following events occur:
1. SMBALERT is pulled low.
2. The 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 SMBALERT output is low
responds to the alert response address, and the
master reads its device address. The address of the
device is now known and can be interrogated in
the usual way.
4. If more than one device’s SMBALERT output is
low, the one with the lowest device address has
priority in accordance with normal SMBus
arbitration.
5. Once the ADT7490 has responded to the alert
response address, the master must read the status
S ADDRESS W A
1 2 3
SLAVE
4
REGISTER
ADDRESS
5
A
6 7 8
DATA A P
registers, and the SMBALERT is cleared only if
the error condition is gone.
SMBus Timeout
Figure 22. Single-byte Write to a Register
Read Operations
The ADT7490 uses the following SMBus read protocols.
Receive Byte
This operation is useful when repeatedly reading a single
register. The register address must be previously set up. In
this operation, the master device receives a single byte from
a slave device, as follows:
1. The master device asserts a start condition on SDA.
2. The master sends the 7-bit slave address followed
by the read bit (high).
3. The addressed slave device asserts ACK on SDA.
4. The master receives a data byte.
5. The master asserts NO ACK on SDA.
6. The master asserts a stop condition on SDA, and
the transaction ends.
In the ADT7490, the receive byte protocol is used to read
a single byte of data from a register whose address has
previously been set by a send byte or write byte operation.
This operation is illustrated in Figure 23.
The ADT7490 includes an SMBus timeout feature. If
there is no SMBus activity for 35 ms, the ADT7490 assumes
the bus is locked and releases the bus. This prevents the
device from locking or holding the SMBus expecting data.
Some SMBus controllers cannot work with the SMBus
timeout feature, so it can be disabled.
Configuration Register 7 (Register 0x11)
Bit 4 (TODIS) = 0, SMBus Timeout Enabled (Default)
Bit 4 (TODIS) = 1, SMBus Timeout Disabled
Voltage Measurement Input
The ADT7490 has six external voltage measurement
channels. It can also measure its own supply voltage, V CC .
Pin 20 to Pin 23 can measure 5.0 V, 12 V, and 2.5 V
supplies, and the processor core voltage V CCP (0 V to 3.0 V
input). The 2.5 V input can be used to monitor a chipset
supply voltage in computer systems. The V CC supply
voltage measurement is carried out through the V CC pin
(Pin 4). Pin 8 measures the V TT voltage of the processor and
is the dedicated reference voltage for the PECI circuitry. The
I MON input on Pin 19 can be used to monitor the I MON
http://onsemi.com
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| ADT7490ARQZ-REEL7 | 功能描述:IC THERM MON FAN CTRLR 24-QSOP 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 |
| ADT7490ZEVB | 功能描述:BOARD EVALUATION FOR ADT7490 RoHS:是 类别:编程器，开发系统 >> 过时/停产零件编号 系列:dBCool® 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ADT75 | 制造商:AD 制造商全称:Analog Devices 功能描述:+-1∑C Accurate, 12-Bit Digital Temperature Sensor |
| ADT7516 | 制造商:AD 制造商全称:Analog Devices 功能描述:SPI/I2C Compatible, Temperature Sensor, Four Channel ADC and Quad Voltage Output DAC |
| ADT7516_06 | 制造商:AD 制造商全称:Analog Devices 功能描述:SPI-/I2C-Compatible, Temperature Sensor,4-Channel ADC and Quad Voltage Output |
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