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參數(shù)資料
| 型號(hào)： | TCN75-3.3MPA |
| 廠商： | TelCom Semiconductor, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 2-WIRE SERIAL TEMPERATURE SENSOR AND THERMAL MONITOR |
| 中文描述： | 2線串行溫度傳感器和溫度監(jiān)測(cè) |
| 文件頁(yè)數(shù)： | 4/10頁(yè) |
| 文件大小： | 259K |
| 代理商： | TCN75-3.3MPA |
4
2-WIRE SERIAL TEMPERATURE
SENSOR AND THERMAL MONITOR
TCN75
PRELIMINARY INFORMATION
TCN75-04 6/16/97
A0 in the serial bit stream must match the states of the A2,
A1 and A0 address inputs for the TCN75 to respond with an
Acknowledge (indicating the TCN75 is on the bus and ready
to accept data). The Slave Address is represented by:
TCN75 Slave Address
1
0
MSB
0
1
A2
A1
A0
LSB
Comparator/Interrupt Modes
INT/CMPTR behaves differently depending on whether
the TCN75 is in Comparator Mode or Interrupt Mode.
Comparator Mode is designed for simple thermostatic op-
eration. INT/CMPTR will go active anytime TEMP exceeds
T
SET
. When in Comparator Mode, INT/CMPTR will remain
active until TEMP falls below T
HYST
, whereupon it will reset
to its inactive state. The state of INT/CMPTR is maintained
in shutdown mode when the TCN75 is in comparator mode.
In Interrupt Mode, INT/CMPTR will remain active indefi-
nitely, even if TEMP falls below T
HYST
, until any register is
read via the 2-wire bus. Interrupt Mode is better suited to
interrupt driven microprocessor-based systems. The INT/
CMPTR output may be wire-OR'ed with other interrupt
sources in such systems. Note that a pull-up resistor is
necessary on this pin since it is an open-drain output.
Entering Shutdown Mode will unconditionally reset INT/
CMPTR when in Interrupt Mode.
SHUTDOWN MODE
When the appropriate bit is set in the configuration
register (CONFIG) the TCN75 enters its low-power shut-
down mode (I
DD
= 1
μ
A, typical) and the temperature-to-
digital conversion process is halted. The TCN75's bus
interface remains active and TEMP, T
SET
, and T
HYST
may be
read from and written to. Transitions on SDA or SCL due to
external bus activity may increase the standby power con-
sumption. If the TCN75 is in Interrupt Mode, the state of INT/
CMPTR will be RESET upon entering shutdown mode.
Fault Queue
To lessen the probability of spurious activation of INT/
CMPTR the TCN75 may be programmed to filter out tran-
sient events. This is done by programming the desired value
into the Fault Queue. Logic inside the TCN75 will prevent the
device from triggering INT/CMPTR unless the programmed
number of sequential temperature-to-digital conversions
yield the same qualitative result. In other words, the value
reported in TEMP must remain above T
SET
or below T
HYST
for the consecutive number of cycles programmed in the
Fault Queue. Up to a six-cycle "filter" may be selected. See
Register Set and Programmer's Model
Serial Port Operation
The Serial Clock input (SCL) and bidirectional data port
(SDA) form a 2-wire bidirectional serial port for programming
and interrogating the TCN75. The following conventions are
used in this bus scheme:
TCN75 Serial Bus Conventions
Term
Explanation
Transmitter
Receiver
Master
The device sending data to the bus.
The device receiving data from the bus.
The device which controls the bus: initiating
transfers (START), generating the clock, and
terminating transfers (STOP).
The device addressed by the master.
A unique condition signaling the beginning of a
transfer indicated by SDA falling (High-Low) while
SCL is high.
A unique condition signaling the end of a transfer
indicated by SDA rising (Low - High) while SCL is
high.
A Receiver acknowledges the receipt of each
byte with this unique condition. The Receiver
drives SDA low during SCL high of the ACK
clock-pulse. The Master provides the clock pulse
for the ACK cycle.
When the bus is idle, both SDA & SCL will
remain high.
The state of SDA must remain stable during the
High period of SCL in order for a data bit to be
considered valid. SDA only changes state while
SCL is low during normal data transfers. (See
Start and Stop conditions)
Slave
Start
Stop
ACK
NOT Busy
Data Valid
All transfers take place under control of a host, usually
a CPU or microcontroller, acting as the Master, which
provides the clock signal for all transfers. The TCN75 always
operates as a Slave. This serial protocol is illustrated in
Figure 2. All data transfers have two phases; and all bytes
are transferred MSB first. Accesses are initiated by a start
condition (START), followed by a device address byte and
one or more data bytes. The device address byte includes
a Read/Write selection bit. Each access must be terminated
by a Stop Condition (STOP). A convention called Acknowl-
edge(ACK) confirms receipt of each byte. Note that SDA
can change only during periods when SCL is LOW (SDA
changes while SCL is HIGH are reserved for Start and Stop
Conditions).
Start Condition (START)
The TCN75 continuously monitors the SDA and SCL
lines for a start condition (a HIGH to LOW transition of SDA
while SCL is HIGH), and will not respond until this condition
is met.
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| TCN75-5.0MOA | 功能描述:板上安裝溫度傳感器 2-Wire RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)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(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| TCN75-5.0MOA713 | 功能描述:板上安裝溫度傳感器 2-Wire RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)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(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| TCN75-5.0MOA713G | 功能描述:板上安裝溫度傳感器 2-Wire RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)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(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| TCN75-5.0MOAG | 功能描述:板上安裝溫度傳感器 2-Wire RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)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(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| TCN75-5.0MPA | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:2-WIRE SERIAL TEMPERATURE SENSOR AND THERMAL MONITOR |
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