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參數(shù)資料
| 型號： | FM75 |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Low Voltage 2-Wire Digital Temperature Sensor with Thermal Alarm |
| 中文描述： | 低電壓2 - Wire數(shù)字溫度傳感器，熱報警器 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大小： | 532K |
| 代理商： | FM75 |
PRODUCT SPECIFICATION
FM75
REV. 1.0.5 10/2/03
11
Reading
If the pointer is already pointing to the desired register, the
master can read from that register by setting the read/write
bit (following the slave address) to a 1. After sending an
ACK, the FM75 will begin transmitting data during the
following clock cycle. If the Configuration Register is
being read, the FM75 will transmit one byte of data (see
Figure 10). The master device should respond with a NACK
followed by a stop condition. If the Temperature, T
OS
or
T
HYST
Register is being read, the FM75 will transmit two
bytes of data (see Figure 9). The master must respond to the
first byte of data with an ACK and to the second byte of data
with a NACK followed by a stop condition.
To read from a register other than the one currently being
pointed to by the Command Register, a pointer set to the
desired register must be done as described previously.
Immediately following the pointer set, the master must
perform a repeat start condition (see Figures 8 and 12) which
indicates to the FM75 that a new operation is about to occur.
It is important to note that if the repeat start condition does
not occur, the FM75 will assume that a write is taking place,
and the selected register will be overwritten by the upcoming
data on the data bus. After the start condition, the master
must again send the device address and read/write bit. This
time the read/write bit must be set to 1 to indicate a read. The
rest of the read cycle is the same as described in the previous
paragraph for reading from a preset pointer location.
Writing
All writes must be proceeded by a pointer set as described
previously, even if the pointer is already pointing to the
desired register.
Immediately following the pointer set, the master must
begin transmitting the data to be written. If the master is
writing to the Configuration Register, one byte of data must
be sent (see Figure 13). If the T
OS
or T
HYST
Register is
being written to, the master must send two bytes of data
(see Figure 11). After transmitting each byte of data, the
master must release the SDA line for one clock to allow the
FM75 to acknowledge receiving the byte. The write
operation should be terminated by a stop signal from the
master.
Inadvertent 8-Bit Read from a 16-Bit
Register: A Caution
An inadvertent 8-bit read from a 16-bit register, with the
D7 bit low, can cause the FM75 to pause in a state where the
SDA line is pulled low by the output data and is incapable of
receiving either a stop or a start condition from the master.
The only way to remove the FM75 from this state is to
continue clocking for 9 cycles until SDA goes high, at which
time issuing a stop condition will reset the FM75. This
sequence can be seen in Figure 7 below.
Figure 7. Inadvertent 8-Bit Read from 16-Bit Register Where D7 = 0 and Forces Output Low
D7 D6 D5 D4 D3 D2 D1 D0
D7
Address Byte
Most Significant
Data Byte
(from FM75)
1
0
0
1
A2 A1 A0R/W
Master must
detect error
condition on
FM75
A
N
Nine additional clock cycles to reset the FM75
Ack
from
FM75
No Ack
from
Master
No Ack
from
Master
Start
from
Master
SCL
SDA
Stop intended by
Master, but FM75
SDA line locked
low
D6 D5 D4 D3 D2 D1 D0 N
Stop
Condition
from
Master
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相關代理商/技術參數(shù) |
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|---|---|
| FM75_06 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Low-Voltage Two-Wire Digital Temperature Sensor with Thermal Alarm |
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| FM751V-NL | 制造商:FORMOSA 制造商全稱:Formosa MS 功能描述:30mA Surface Mount Small Signal Schottky Diode- 40V |
| FM754 | 制造商:BACO Controls Inc 功能描述: |
| FM75M8 | 功能描述:板上安裝溫度傳感器 Low Voltage Digital I2C comp Temp Sensor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
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