參數(shù)資料
型號(hào)： NVT210DMTR2G
廠商： ON Semiconductor
文件頁(yè)數(shù)： 10/20頁(yè)
文件大?。?/td> 325K
描述： IC TEMP SENSOR DGTL 8-WDFN
標(biāo)準(zhǔn)包裝： 3,000
功能： 溫度監(jiān)控系統(tǒng)（傳感器）
傳感器類(lèi)型： 內(nèi)部和外部
感應(yīng)溫度： 0°C ~ 127°C，-64°C ~ 191°C
精確度： ±2.5°C
拓?fù)洌?/td> ADC，比較器，多路復(fù)用器，寄存器庫(kù)
輸出類(lèi)型： 2 線串行，I²C?/SMBUS?
輸出警報(bào)： 是
輸出風(fēng)扇： 是
電源電壓： 2.8 V ~ 3.6 V
工作溫度： -40°C ~ 125°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 8-WFDFN
供應(yīng)商設(shè)備封裝： 8-WDFN（2x2）
包裝： 帶卷 (TR)
NVT210
http://onsemi.com
10
Table 8. CONFIGURATION REGISTER BIT
ASSIGNMENTS
Bit
Name
Function
Power-on
Default
7
MASK1
0 = ALERT
 Enabled
1 = ALERT
 Masked
0
6
RUN/STOP
0 = Run
1 = Standby
0
5
ALERT
/
THERM2
0 = ALERT
1 = THERM2
0
4, 3
Reserved
0
2
Temperature
Range Select
0 = 0癈 to 127癈
1 = Extended Range
0
1, 0
Reserved
0
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 eight conversions per second means that
beginning at 125 ms intervals, the device performs a
conversion on the internal and the external temperature
channels.
The conversion rate register can be written to and read
back over the SMBus/I
2
C. 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.
Table 9. CONVERSION RATE REGISTER CODES
Code
Conversion/Second
Time
0x00
0.0625
16 s
0x01
0.125
8 s
0x02
0.25
4 s
0x03
0.5
2 s
0x04
1
1 s
0x05
2
500 ms
0x06
4
250 ms
0x07
8
125 ms
0x08
16
62.5 ms
0x09
32
31.25 ms
0x0A
64
15.5 ms
0x0B to 0xFF
Reserved

Limit Registers
The NVT210 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/I
2
C. See Table 13 for details of
the limit register addresses 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 ?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 can 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. Therefore, if the temperature measurement uses
default binary, then the temperature limits also use the
binary scale. If the temperature measurement scale is
switched,   however,   the   temperature   limits   do   not
automatically switch. 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 with the
default binary scale, the limit register value is 0000 1010b.
If the scale is switched to offset binary, the value in the low
temperature limit register needs to be reprogrammed to
0100 1010b.
Status Register
The status register is a read-only register at Address 0x02.
It contains status information for the NVT210.
When Bit 7 of the status register is high, it indicates that
the ADC is busy converting. The other bits in this register
flag the out-of-limit temperature measurements (Bit 6 to
Bit 3, and Bit 1 to Bit 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 NORed 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, Bit 6 to
Bit 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.
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