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| 型号： | ADT7468ARQ |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/81页 |
| 文件大小： | 0K |
| 描述： | IC REMOTE THERMAL CTRLR 24-QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Obsolescence 11/Feb/2009 |
| 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 ~ 120°C，外部传感器 |
| 精确度： | ±2°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 ~ 5.5 V |
| 工作温度： | -40°C ~ 120°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 |
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ADT7468
PRODUCT DESCRIPTION
The ADT7468 is a complete thermal monitor and multiple fan
controller for any system requiring thermal monitoring and
cooling. The device communicates with the system via a serial
system management bus. The serial bus controller has a serial
data line for reading and writing addresses and data (Pin 1), and
an input line for the serial clock (Pin 2). All control and
On the ADT7463, the measurement range is from ?127°C
to +127°C. This means that the ADT7468 can measure
higher temperatures. The ADT7468 also includes the
ADT7463 temperature range; the temperature measure-
ment range can be switched by setting Bit 0 of
Configuration Register 5.
programming functions for the ADT7468 are performed over
the serial bus. In addition, a pin can be reconfigured as an
SMBALERT output to signal out-of-limit conditions.
COMPARISON BETWEEN ADT7463 AND ADT7468
The ADT7468 is an upgrade to the ADT7463. The ADT7468
and ADT7463 are almost pin and register map compatible. The
ADT7468 and ADT7463 have the following differences:
6.
7.
The ADT7468 maximum fan speed (% duty cycle) in the
automatic fan speed control loop can be programmed. The
maximum fan speed is 100% duty cycle on the ADT7463
and is not programmable.
The offset register in the ADT7468 is programmable up to
±64°C with 0.50°C resolution. The offset register of the
ADT7463 is programmable up to ±32°C with 0.25°C
1.
On the ADT7468, the PWM drive signals can be config-
resolution.
ured as either high frequency or low frequency drives. The
low frequency option is programmable between 10 Hz and
100 Hz. The high frequency option is 22.5 kHz. On the
ADT7463, only the low frequency option is available.
8.
V CCP is monitored on Pin 23 of the ADT7468 and can be
used to set the threshold for THERM (PROCHOT) (2/3 of
V CCP ). The threshold for THERM (PROCHOT) is set at
V IH = 1.7 V and V IL = 0.8 V on the ADT7463.
2.
Once V CC is powered up, monitoring of temperature and
fan speeds is enabled on the ADT7468 when V CCP is
powered up. If V CCP is never powered up, this is enabled
9.
On the ADT7463, Pin 22 can be reconfigured as SMBus
ALERT. Thi s is not available on the ADT7468; instead,
SMBALERT can be enabled on Pin 14.
3.
4.
5.
when the first SMBus transaction with the ADT7468 is
completed. On the ADT7463, the STRT bit in Configur-
ation Register 1 must be set to enable monitoring.
The fans are switched off by default upon power-up. On
the ADT7463, the fans run at full speed on power-up.
Fail-safe cooling is provided such that when the measured
temperature exceeds the THERM limit (100°C), the fans
run at full speed.
Fail-safe cooling is also provided 4.6 secs after V CCP is
powered-up (see Figure 48). The fans operate at full speed
if the ADT7468 has not been addressed via the SMBus
within 4.6 secs of when the V CCP is powered up. This
protects the system in the event that the SMBus fails. The
ADT7468 can be programmed at any time, and it behaves
as programmed. If V CCP is never powered-up, fail-safe
cooling is effectively disabled. If V CCP is disabled, writing to
the ADT7468 at any time causes the ADT7468 to operate
normally.
Series resistance cancellation (SRC) is provided on the
remote temperature channels on the ADT7468, but not on
the ADT7463. SRC automatically cancels linear offset
introduced by a series resistance between the thermal
diode and the sensor.
The ADT7468 has an extended temperature measurement
10. A GPIO can also be made available on Pin 14 on the
ADT7468. This is not available on the ADT7463. Set the
GPIO polarity and direction in Configuration Register 5.
The GPIO status b it is Bit 5 of Status Register 2 (shared
with TACH4 and THERM, because only one can be
enabled at a time).
11. The ADT7463 has three possible SMBus addresses, which
are selectable using the address select and address enable
pins. The ADT7468 has one SMBus address available at
Address 0x2E.
Due to the inclusion of extra functionality, the register map has
changed, including an additional configuration register:
Configuration Register 5 at Address 0x7C.
Configuration Register 5
Bit 0: If Bit 0 is set to 1, in terms of temperature the ADT7468 is
backward-compatible with the ADT7463. Measurements
including the T MIN calibration circuit, and fan control work in
the range of ?127°C to +127°C. Also, care should be taken in
reprogramming the temperature limits (T MIN , operating point,
and THERM limits) to their desired twos complement value,
because the power-on default for them is at Offset 64. The
extended temperature range is ?64°C to 191°C. The default is 1,
which is in the ?64°C to +191°C temperature range.
range. The measurement range goes from–64°C to +191°C.
Rev. 3 | Page 10 of 81 | www.onsemi.com
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| ADT7468ARQ-REEL | 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP RoHS:否 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 |
| ADT7468ARQ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP RoHS:否 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 |
| ADT7468ARQZ | 功能描述:板上安装温度传感器 RMT THRM CTR VLT MON 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 |
| ADT7468ARQZ-REEL | 功能描述:板上安装温度传感器 RMT THRM CTR VLT MON 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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