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| 型号： | NCT75MNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/15页 |
| 文件大小： | 181K |
| 描述： | IC SENSOR TEMP DGTL 8DFN |
| 标准包装： | 3,000 |
| 功能： | 温度监控系统（传感器） |
| 传感器类型： | 内部 |
| 感应温度： | -55°C ~ 125°C |
| 精确度： | ±3°C |
| 拓扑： | ADC（三角积分型），控制逻辑，寄存器库 |
| 输出类型： | 2 线串行，I²C?/SMBUS? |
| 输出警报： | 是 |
| 输出风扇： | 无 |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（2x2） |
| 包装： | 带卷 (TR) |
NCT75
http://onsemi.com
11
Reading Data
Reading data from the NCT75 is done in two different
ways depending on the register being read. The
configuration register is only 8 bits wide so a single byte
read is used for this (shown in Figure 8). This consists of the
device address followed by the data from the register.
Reading the data in the temperature value register requires
a two byte read (shown in Figure 9). This consists of the
device address, followed by two bytes of data from the
temperature register (the first byte is the MSB). In both cases
the address pointer register of the register being read must
be written to prior to performing a read operation.
OS
/ALERT
Output Overtemperature Modes
The OS
/ALERT
output pin can operate in two different
modes overtemperature mode and SMBus alert mode. The
pin defaults to overtemperature mode on power up. This
means that it becomes active when the measured
temperature meets or exceeds the limit stored in the T
OS
setpoint register. At this point it can deal with the event in
one of two ways which depends on the mode it is in. The two
overtemperature modes are: comparator mode and interrupt
mode. Comparator mode is the default mode on power up.
More information on comparator and interrupt modes
alsong with the SMBus alert mode are explained below.
Comparator Mode
In Comparator Mode, the OS
/ALERT
pin becomes active
when the measured temperature equals or exceeds the limit
stored in the T
OS
setpoint register. The pin returns to its
inactive status when the temperature drops below the T
HYST
setpoint register value.
NOTE: Shutdown mode does not reset the output state for
comparator mode.
Interrupt Mode
In the interrupt mode, the OS
/ALERT
pin becomes active
when the temperature equals or exceeds the T
OS
limit for
a consecutive number of faults. It can be reset by performing
a read operation on any register in the NCT75. The output
can only become active again when the T
OS
limit has been
equalled or exceeded.
Figure 11 shows how both the interrupt and comparator
modes operate in relation to the output pin (OS
/ALERT
). It
also shows the operation of the polarity bit in the
configuration register.
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