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| 型号： | ADT7476AARQZ |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/66页 |
| 文件大小： | 945K |
| 描述： | IC REMOTE THERM CTRLR 5V 24QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi QSOP 24ld Pkg (MSL) Change 17/Jun/2010 Product Discontinuation 30/Sept/2011 |
| 标准包装： | 56 |
| 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： | ±2.5% |
| 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： | 管件 |
| 产品目录页面： | 1118 (CN2011-ZH PDF) |
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ADT7476A
http://onsemi.com
13
Table 8. VOLTAGE LIMIT REGISTERS
Register
Description
Default
0x44
2.5 V Low Limit
0x00
0x45
2.5 V High Limit
0xFF
0x46
V
CCP
Low Limit
0x00
0x47
V
CCP
High Limit
0xFF
0x48
V
CC
Low Limit
0x00
0x49
V
CC
High Limit
0xFF
0x4A
5.0 V Low Limit
0x00
0x4B
5.0 V High Limit
0xFF
0x4C
12 V Low Limit
0x00
0x4D
12 V High Limit
0xFF
Table 13 shows the input ranges of the analog inputs and
output codes of the 10-bit ADC.
When the ADC is running, it samples and converts a
voltage input in 0.7 ms and averages 16 conversions to
reduce noise; a measurement takes nominally 11 ms.
Extended Resolution Registers
Voltage measurements can be made with higher accuracy
using the extended resolution registers (0x76 and 0x77).
Whenever the extended resolution registers are read, the
corresponding data in the voltage measurement registers
(0x20 to 0x24) is locked until their data is read. That is, if
extended resolution is required, then the extended resolution
register must be read first, immediately followed by the
appropriate voltage measurement register.
Additional ADC Functions for Voltage Measurements
A number of other functions are available on the
ADT7476A to offer the system designer increased
flexibility.
Turn-off Averaging
For each voltage/temperature measurement read from a
value register, 16 readings have been made internally and the
results averaged before being placed into the value register.
When faster conversions are needed, setting Bit 4 of
Configuration Register 2 (0x73) turns averaging off. This
effectively gives a reading 16 times faster but the reading
can be noisier. The default round robin cycle time takes
146.5 ms.
Table 9. CONVERSION TIME WITH AVERAGING
DISABLED
Channel
Measurement Time (ms)
Voltage Channels
0.7
Remote Temperature 1
7
Remote Temperature 2
7
Local Temperature
1.3
When Bit 7 of Configuration Register 6 (0x10) is set, the
default round robin cycle time increases to 240 ms.
Bypass All Voltage Input Attenuators
Setting Bit 5 of Configuration Register 2 (0x73) removes
the attenuation circuitry from the 2.5 V, V
CCP
, V
CC
, 5.0 V,
and 12 V inputs. This allows the user to directly connect
external sensors or rescale the analog voltage measurement
inputs for other applications. The input range of the ADC
without the attenuators is 0 V to 2.25 V.
Bypass Individual Voltage Input Attenuators
Bits [7:4] of Configuration Register 4 (0x7D) can be used
to bypass individual voltage channel attenuators.
Table 10. BYPASSING INDIVIDUAL VOLTAGE INPUT
ATTENUATORS
Configuration Register 4 (0x7D)
Bit No.
Channel Attenuated
[4]
Bypass 2.5 V Attenuator
[5]
Bypass V
CCP
Attenuator
[6]
Bypass 5.0 V Attenuator
[7]
Bypass 12 V Attenuator
Table 11. CONFIGURATION REGISTER 2 (REG. 0x73)
Bit
Description
[4]
1: Averaging Off
[5]
1: Bypass Input Attenuators
[6]
1: Single-channel Convert Mode
TACH1 Minimum High Byte (0x55)
[7:5] Selects ADC channel for single-channel convert mode.
Single-channel ADC Conversion
While single-channel mode is intended as a test mode that
can be used to increase sampling times for a specific
channel, and therefore helps to analyze that channels
performance in greater detail, it can also have other
applications.
Setting Bit 6 of Configuration Register 2 (0x73) places
the ADT7476A into single-channel ADC conversion mode.
In this mode, the ADT7476A can only read a single voltage
channel. The selected voltage input is read every 0.7 ms. The
appropriate ADC channel is selected by writing to Bits [7:5]
of the TACH1 minimum high byte register (0x55).
Table 12. PROGRAMMING SINGLE-CHANNEL
ADC MODE
Bits [7:4], Register 0x55
Channel Selected (Note 1)
000
2.5 V
001
V
CCP
010
V
CC
011
5.0 V
100
12 V
101
Remote 1 Temperature
110
Local Temperature
111
Remote 2 Temperature
1. In the process of configuring single-channel ADC conversion
mode, the TACH1 minimum high byte is also changed, possibly
trading off TACH1 minimum high byte functionality with
single-channel mode functionality.
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| ADT7476AARQZ-R | 功能描述:板上安装温度传感器 MONITORS 5V/4 FANS 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 |
| ADT7476AARQZ-REEL | 功能描述:IC REMOTE THERMAL 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 |
| ADT7476AARQZ-REEL7 | 功能描述:IC REMOTE THERMAL 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 |
| ADT7476AARQZ-RL7 | 功能描述:板上安装温度传感器 MONITORS 5V/4 FANS 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 |
| ADT7476ARQH | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:dBCOOL Remote Thermal Controller and Voltage Monitor |
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