ADT7476A
http://onsemi.com
23
THERM
Timer
The ADT7476A has an internal timer to measure THERM
assertion time. For example, the THERM
input can be
connected to the PROCHOT
output of a Pentium
?/DIV>
4 CPU to
measure system performance. The THERM
input can also
be connected to the output of a trip-point temperature sensor.
The timer is started on the assertion of the ADT7476As
THERM
input and stopped when THERM
is de-asserted.
The timer counts THERM
times cumulatively; that is, the
timer resumes counting on the next THERM
assertion. The
THERM
timer continues to accumulate THERM
assertion
times until the timer is read (where it is cleared), or until it
reaches full scale. If the counter reaches full scale, it stops
at that reading until cleared.
The 8-bit THERM
timer status register (0x79) is designed
so that Bit 0 is set to 1 on the first THERM
assertion. Once
the cumulative THERM
assertion time has exceeded
45.52 ms, Bit 1 of the THERM
timer is set and Bit 0 now
becomes the LSB of the timer with a resolution of 22.76 ms
(see Figure 32).
Figure 32. Understanding the THERM
Timer
THERM
ASSERTED
?2.76 ms
THERM
ASSERTED
?5.52 ms
THERM
ASSERTED
?13.8 ms
(91.04 ms + 22.76 ms)
THERM
THERM
THERM
TIMER
(REG. 0x79)
THERM
TIMER
(REG. 0x79)
THERM
THERM
TIMER
(REG. 0x79)
ACCUMULATE THERM
LOW
ASSERTION TIMES
ACCUMULATE THERM
LOW
ASSERTION TIMES
1
0
0
0
0
0
0
0
0
1
2
3
4
5
6
7
0
1
0
0
0
0
0
0
0
1
2
3
4
5
6
7
1
0
1
0
0
0
0
0
0
1
2
3
4
5
6
7
When using the THERM
timer, be aware of the following:
After a THERM
timer read (0x79)
1. The contents of the timer are cleared on read.
2. The F4P bit (Bit 5) of Interrupt Status Register 2
needs to be cleared (assuming that the THERM
timer limit has been exceeded).
If the THERM
timer is read during a THERM
assertion, the
following occurs:
1. The contents of the timer are cleared.
2. Bit 0 of the THERM
timer is set to 1, because a
THERM
assertion is occurring.
3. The THERM
timer increments from zero.
4. If the THERM
timer limit register (0x7A) = 0x00,
the F4P bit is set.
Generating SMBALERT
Interrupts from THERM
Timer
Events
The ADT7476A can generate SMBALERT
s when a
programmable THERM
timer limit has been exceeded. This
allows the system designer to ignore brief, infrequent
THERM
assertions, while capturing longer THERM
timer
events. Register 0x7A is the THERM
timer limit register.
This 8-bit register allows a limit from 0 sec (first THERM
assertion) to 5.825 sec to be set before an SMBALERT
is
generated. The THERM
timer value is compared with the
contents of the THERM
timer limit register. If the THERM
timer value exceeds the THERM
timer limit value, then the
F4P bit (Bit 5) of Interrupt Status Register 2 is set and an
SMBALERT
is generated.
NOTE: Depending on which pins are configured as a THERM
timer,
setting the F4P bit (Bit 5) of Mask Register 2 (0x75) or Bit 0
of Mask Register 1 (0x74) masks out SMBALERT
; although
the F4P bit of Interrupt Status Register 2 is still set if the
THERM
timer limit is exceeded.
Figure 33 is a functional block diagram of the THERM
timer, limit, and associated circuitry. Writing a value of 0x00
to the THERM
timer limit register (0x7A) causes an
SMBALERT
to be generated on the first THERM
assertion.
A THERM
timer limit value of 0x01 generates an
SMBALERT
once cumulative THERM
assertions exceed
45.52 ms.
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
ADT7481ARMZ-1RL
IC SENSOR TEMP 2CH ALARM 10MSOP
ADT7482ARMZ-REEL
IC SENSOR TEMP 2CH ALARM 10MSOP
ADT7485AARMZ-R
IC TEMP/VOLT DGL SENS SST 10MSOP
ADT7486AARMZ-RL
IC TEMP SENS DGTL 2CH SST 10MSOP
ADT7488AARMZ-RL
IC TEMP/VOLT DGTL W/SST 10MSOP
ADT7518ARQZ
IC SENSOR TEMP QD ADC/DAC 16QSOP
AT30TS00-MAH-T
SENSOR DGTL TEMP I2C/SMBUS 8WDFN
AT30TSE002B-MAH-T
SENSOR DGTL TEMP I2C/SMBUS 8WDFN
相关代理商/技术参数
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
ADT7476ARQH-REEL
制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:dBCOOL Remote Thermal Controller and Voltage Monitor
ADT7476ARQZ
功能描述:马达/运动/点火控制器和驱动器 MLTCH TDM FAN CTRLR RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube
ADT7476ARQZ-R7
功能描述:马达/运动/点火控制器和驱动器 MLTICH TDM FAN CTRLR RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube
ADT7476ARQZ-REEL
功能描述:马达/运动/点火控制器和驱动器 MLTICH TDM FAN CTRLR
RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube