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| 型号： | ADT7461ARZ |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/20页 |
| 文件大小： | 268K |
| 描述： | IC TEMP MONITOR +/-1C DUAL 8SOIC |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Discontinuation 30/Sept/2011 |
| 标准包装： | 98 |
| 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： | 0°C ~ 127°C，-55°C ~ 150°C |
| 精确度： | ±3°C |
| 拓扑： | ADC，比较器，多路复用器，寄存器库 |
| 输出类型： | 2 线 SMBus? |
| 输出警报： | 是 |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 管件 |
| 产品目录页面： | 1129 (CN2011-ZH PDF) |
ADT7461
http://onsemi.com
10
Conversion Rate Register
The conversion rate register is Address 0x04 at read and
Address 0x0A at write. The lowest four bits of this register
are used to program the conversion rate by dividing the
internal oscillator clock by 1, 2, 4, 8, 16, 32, 64, 128, 256,
512, or 1024 to give conversion times from 15.5 ms (Code
0x0A) to 16 seconds (Code 0x00). For example, a
conversion rate of 8 conversions per second means that
beginning at 125 ms intervals; the device performs a
conversion on the internal and external temperature
channels.
This register can be written to and read back over the
SMBus. The higher four bits of this register are unused and
must be set to 0. The default value of this register is 0x08,
giving a rate of 16 conversions per second. Use of slower
conversion times greatly reduces the device power
consumption, as shown in Table 9.
Table 9. CONVERSION RATE REGISTER CODES
Code
Conversion/
Sec
Average Supply Current
mA Typ at VDD = 5.5 V
0x00
0.0625
121.33
0x01
0.125
128.54
0x02
0.25
131.59
0x03
0.5
146.15
0x04
1
169.14
0x05
2
233.12
0x06
4
347.42
0x07
8
638.07
0x08
16
252.44
0x09
32
417.58
0x0A
64
816.87
0x0B to 0xFF
Reserved
Limit Registers
The ADT7461 has eight limit registers: high, low, and
THERM
temperature limits for both local and remote
temperature measurements. The remote temperature high
and low limits span two registers each to contain an upper
and lower byte for each limit. There is also a THERM
hysteresis register. All limit registers can be written to and
read back over the SMBus. See Table 13 for address details
of the limit registers and their power-on default values.
When Pin 6 is configured as an ALERT
output, the high
limit registers perform a > comparison while the low limit
registers perform a d comparison. For example, if the high
limit register is programmed with 80癈, then measuring
81癈 results in an out-of-limit condition, setting a flag in the
status register. If the low limit register is programmed with
0癈, measuring 0癈 or lower results in an out-of-limit
condition.
Exceeding either the local or remote THERM
limit asserts
THERM
low. When Pin 6 is configured as THERM2
,
exceeding either the local or remote high limit asserts
THERM2
low. A default hysteresis value of 10癈 is
provided that applies to both THERM
channels. This
hysteresis value may be reprogrammed to any value after
powerup (Register Address 0x21).
It is important to remember that the temperature limits
data format is the same as the temperature measurement data
format. So, if the temperature measurement uses default
binary, the temperature limits also use the binary scale. If the
temperature measurement scale is switched, however, the
temperature limits do not switch automatically. The user
must reprogram the limit registers to the desired value in the
correct data format. For example, if the remote low limit is
set at 10癈 and the default binary scale is being used, the
limit register value should be 0000 1010b. If the scale is
switched to offset binary, the value in the low temperature
limit register should be reprogrammed to be 0100 1010b.
Status Register
The status register is a read-only register at Address 0x02.
It contains status information for the ADT7461.
Bit 7 of the status register indicates the ADC is busy
converting when it is high. The other bits in this register flag
the out-of-limit temperature measurements (Bits 6 to 3 and
Bits 1 to 0) and the remote sensor open circuit (Bit 2).
If Pin 6 is configured as an ALERT
output, the following
applies. If the local temperature measurement exceeds its
limits, Bit 6 (high limit) or Bit 5 (low limit) of the status
register asserts to flag this condition. If the remote
temperature measurement exceeds its limits, then Bit 4
(high limit) or Bit 3 (low limit) asserts. Bit 2 asserts to flag
an open-circuit condition on the remote sensor. These five
flags are NORd together so if any of them is high, the
ALERT
interrupt latch is set and the ALERT
output goes
low.
Reading the status register clears the five flags, Bits 6 to 2,
provided the error conditions causing the flags to be set have
gone away. A flag bit can be reset only if the corresponding
value register contains an in-limit measurement or if the
sensor is good.
The ALERT
interrupt latch is not reset by reading the
status register. It resets when the ALERT
output has been
serviced by the master reading the device address, provided
the error condition has gone away and the status register flag
bits are reset.
When Flag 1 and/or Flag 0 are set, the THERM
output
goes low to indicate the temperature measurements are
outside the programmed limits. The THERM
output does
not need to be reset, unlike the ALERT
output. Once the
measurements are within the limits, the corresponding status
register bits are reset automatically and the THERM
output
goes high. The user may add hysteresis by programming
Register 0x21. The THERM
output is reset only when the
temperature falls to limit value minus hysteresis value.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7461ARZ | 制造商:ON Semiconductor 功能描述:TEMPERATURE SENSOR IC |
| ADT7461ARZ-REEL | 功能描述:板上安装温度传感器 1C TDM TMP RNG 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 |
| ADT7461ARZ-REEL7 | 功能描述:板上安装温度传感器 1C TDM TMP RNG 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 |
| ADT7462 | 制造商:AD 制造商全称:Analog Devices 功能描述:Flexible Temperature and Voltage Monitor and System Fan Controller |
| ADT7462ACPZ-500RL7 | 制造商:AD 制造商全称:Analog Devices 功能描述:Flexible Temperature and Voltage Monitor and System Fan Controller |
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