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| 型号： | ADT7481ARMZ-1RL |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/20页 |
| 文件大小： | 237K |
| 描述： | IC SENSOR TEMP 2CH ALARM 10MSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 3,000 |
| 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 ~ 120°C，外部传感器 |
| 精确度： | ±2.5°C（最小值） |
| 拓扑： | ADC，比较器，多路复用器，寄存器库 |
| 输出类型： | SMBus? |
| 输出警报： | 是 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 120°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (TR) |
| 其它名称： | ADT7481ARMZ-1REEL ADT7481ARMZ-1REEL-ND |
ADT7481
http://onsemi.com
9
Registers
The registers in the ADT7481 are eight bits wide. These
registers are used to store the results of remote and local
temperature measurements, high and low temperature limits,
and to configure and control the device. A description of these
registers follows.
Address Pointer Register
The address pointer register does not have, nor does it
require, an address because the first byte of every write
operation is automatically written to this register. The data
in this first byte always contains the address of another
register on the ADT7481, which is stored in the address
pointer register. It is to this register address that the second
byte of a write operation is written to, or to which a
subsequent read operation is performed.
The power-on default value of the address pointer register
is 0x00, so if a read operation is performed immediately after
power-on, without first writing to the address pointer, the
value of the local temperature will be returned since its
register address is 0x00.
Temperature Value Registers
The ADT7481 has five registers to store the results of
local and remote temperature measurements. These
registers can only be written to by the ADC and read by the
user over the SMBus.
" The local temperature value register is at Address 0x00.
" The Remote 1 temperature value high byte register is at
Address 0x01, with the Remote 1 low byte register at
Address 0x10.
" The Remote 2 temperature value high byte register is at
Address 0x30, with the Remote 2 low byte register at
Address 0x33.
" The Remote 2 temperature values can also be read from
Address 0x01 for the high byte, and Address 0x10 for the
low byte if Bit 3 of Configuration Register 1 is set to 1.
" To read the Remote 1 temperature values, set Bit 3 of
Configuration Register 1 to 0.
" The power-on default value for all five registers is 0x00.
Table 9. CONFIGURATION 1 REGISTER (READ ADDRESS 0x03, WRITE ADDRESS 0x09)
Bit
Mnemonic
Function
7
Mask
Setting this bit to 1 masks all ALERT
s on the ALERT
pin. Default = 0 = ALERT
enabled. This applies only if Pin 8 is
configured as ALERT
, otherwise it has no effect.
6
Mon/STBY
Setting this bit to 1 places the ADT7481 in standby mode, that is, it suspends all temperature measurements
(ADC). The SMBus remains active and values can be written to, and read from, the registers. However THERM
and ALERT
are not active in standby mode, and their states in standby mode are not reliable.
Default = 0 = temperature monitoring enabled.
5
AL/TH
This bit selects the function of Pin 8. Default = 0 = ALERT
. Setting this bit to 1 configures Pin 8 as the THERM2
pin.
4
Reserved
Reserved for future use.
3
Remote
1/2
Setting this bit to 1 enables the user to read the Remote 2 values from the Remote 1 registers. When default = 0,
Remote 1 temperature values and limits are read from these registers.
2
Temp
Range
Setting this bit to 1 enables the extended temperature measurement range of 64癈 to +191癈. When using the
default = 0, the temperature range is 0癈 to +127癈.
1
Mask R1
Setting this bit to 1 masks ALERT
s due to the Remote 1 temperature exceeding a programmed limit. Default = 0.
0
Mask R2
Setting this bit to 1 masks ALERT
s due to the Remote 2 temperature exceeding a programmed limit. Default = 0.
Table 10. CONFIGURATION 2 REGISTER (ADDRESS 0x24)
Bit
Mnemonic
Function
7
Lock Bit
Setting this bit to 1 locks all lockable registers to their current values. This prevents tampering with settings until
the device is powered down. Default = 0.
<6:0>
Res
Reserved for future use.
Conversion Rate/Channel Selector Register
The conversion rate/channel selector register for reads is
at Address 0x04, and at Address 0x0A for writes. The four
LSBs of this register are used to program the conversion
times from 15.5 ms (Code 0x0A) to 16 seconds
(Code 0x00). To program the ADT7481 to perform
continuous measurements, set the conversion rate register to
0x0B. For example, a conversion rate of eight
conversions/second means that beginning at 125 ms
intervals, the device performs a conversion on the local and
the remote temperature channels.
This register can be written to, and read back from, the
SMBus. The default value of this register is 0x08, giving a
rate of 16 conversions per second. Using slower conversion
times greatly reduces the device power consumption.
Bit 7 in this register can be used to disable averaging of the
temperature measurements. All temperature channels are
measured by default. It is possible to configure the
ADT7481 to measure the temperature of one channel only.
This can be configured using Bit 4 and Bit 5 (see Table 11).
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相关代理商/技术参数 |
参数描述 |
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| ADT7481ARMZ-R7 | 功能描述:板上安装温度传感器 2 CH TEMP SNSR/ALARM 2 WIRE SMBUS INTRFCE 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 |
| ADT7481ARMZ-REEL | 功能描述:板上安装温度传感器 2 CH TEMP SNSR/ALARM 2 WIRE SMBUS INTRFCE 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 |
| ADT7481ARMZ-REEL7 | 功能描述:IC SENSOR TEMP 2CH ALARM 10MSOP 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 |
| ADT7481EBZEVB | 功能描述:EVALUATION BOARD ADT7481 制造商:on semiconductor 系列:* 零件状态:在售 标准包装:1 |
| ADT7482 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual Channel Temperature Sensor and Overtemperature Alarm |
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