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| 型号： | ADM1031ARQZ |
| 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： | LEAD FREE, MO-137AB, QSOP-16 |
| 文件页数： | 36/36页 |
| 文件大小： | 596K |
| 代理商： | ADM1031ARQZ |
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ADM1031
Rev. B | Page 9 of 36
FUNCTIONAL DESCRIPTION
The ADM1031 is a temperature monitor and dual PWM fan
controller for microprocessor-based systems. The device
communicates with the system via a serial System Management
Bus (SMBus). The serial bus controller has a hardwired address
pin for device selection (Pin 13), a serial data line for reading
and writing addresses and data (Pin 15), and an input line for
the serial clock (Pin 16). All control and programming
functions of the ADM1031 are performed over the serial bus.
The device also supports Alert Response Address (ARA).
INTERNAL REGISTERS
Brief descriptions of the ADM1031’s principal internal registers
are given below. For more detailed information on the function
Configuration Register
This register controls and configures various functions on the
device.
Address Pointer Register
This register contains the address that selects one of the other
internal registers. When writing to the ADM1031, the first byte
of data is always a register address, which is written to the
address pointer register.
Status Registers
These registers provide status of each limit comparison.
Value and Limit Registers
Theses registers store the results of temperature and fan speed
measurements, along with their limit values.
Fan Speed Configuration Register
This register is used to program the PWM duty cycle for each
fan.
Offset Registers
These registers allow the temperature channel readings to be
offset by a 5-bit twos complement value written to these
registers. These values are automatically added to the
temperature values (or subtracted from if negative). This allows
the systems designer to optimize the system if required, by
adding or subtracting up to 15°C from a temperature reading.
Fan Characteristics Registers
These registers are used to select the spin-up time, PWM
frequency, and speed range for the fans used.
THERM Limit Registers
These registers contain the temperature values at which
THERM is asserted.
TMIN/TRANGE Registers
These registers are read/write registers that hold the minimum
temperature value below which the fan does not run when the
device is in automatic fan speed control mode. These registers
also hold the temperature range value that defines the range
over which auto fan control is provided, and hence determines
the temperature at which the fan is run at full speed.
SERIAL BUS INTERFACE
Control of the ADM1031 is carried out via the SMBus. The
ADM1031 is connected to this bus as a slave device, under the
control of a master device, for example, the 810 chipset.
The ADM1031 has a 7-bit serial bus address. When the device
is powered up, it does so with a default serial bus address. The
five MSBs of the address are set to 01011; the two LSBs are
determined by the logical state of Pin 13 (ADD). This is a three-
state input that can be grounded, connected to VCC, or left
open-circuit to give three different addresses. The state of the
ADD pin is only sampled at power-up, so changing ADD with
power on has no effect until the device is powered off, then on
again.
Table 5. ADD Pin Truth Table
ADD Pin
A1
A0
GND
0
No Connect
1
0
VCC
0
1
If ADD is left open-circuit, then the default address is 0101110.
The facility to make hardwired changes at the ADD pin allows
the user to avoid conflicts with other devices sharing the same
serial bus; for example, if more than one ADM1031 is used in a
system.
Serial Bus Protocol
1.
The master initiates 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 follows. 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
that determines the direction of the data transfer, that is,
whether data is written to or read from the slave device.
The peripheral whose address corresponds to the
transmitted 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 a 0, then the
master writes to the slave device. If the R/W bit is a 1, then
the master reads from the slave device.
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| ADM1031ARQZ-R7 | 功能描述:IC SENSOR 2TEMP/FAN CTRL 16QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 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 |
| ADM1031ARQZ-REEL | 功能描述:板上安装温度传感器 2 CH TDM PWM FAN CTRL IC 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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