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| 型號： | TMP401AIDGKTG4 |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 18/28頁 |
| 文件大?。?/td> | 881K |
| 描述： | IC TEMP SENSOR DGTL OUT 8-MSOP |
| 標準包裝： | 250 |
| 功能： | 溫度監(jiān)控系統(tǒng)（傳感器） |
| 傳感器類型： | 內(nèi)部和外部 |
| 感應(yīng)溫度： | -40°C ~ 125°C |
| 精確度： | ±3°C 本地（最大），±5°C 遠程（最大） |
| 拓撲： | ADC，比較器，寄存器庫 |
| 輸出類型： | 2 線 SMBus? |
| 輸出警報： | 是 |
| 輸出風(fēng)扇： | 是 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
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TMP401
SBOS371A AUGUST 2006 REVISED OCTOBER 2007
www.ti.com
18
HIGH-SPEED MODE
In order for the Two-Wire bus to operate at frequencies
above 400kHz, the master device must issue a
High-speed mode (Hs-mode) master code (00001XXX) as
the first byte after a START condition to switch the bus to
high-speed operation. The TMP401 will not acknowledge
this byte, but will switch the input filters on SDA and SCL
and the output filter on SDA to operate in Hs-mode,
allowing transfers at up to 3.4MHz. After the Hs-mode
master code has been issued, the master will transmit a
Two-Wire slave address to initiate a data transfer
operation. The bus will continue to operate in Hs-mode
until a STOP condition occurs on the bus. Upon receiving
the STOP condition, the TMP401 switches the input and
output filter back to fast-mode operation.
TIMEOUT FUNCTION
When bit 7 of the Consecutive Alert Register is set high,
the TMP401 timeout function is enabled. The TMP401
resets the serial interface if either SCL or SDA are held low
for 30ms (typ) between a START and STOP condition. If
the TMP401 is holding the bus low, it releases the bus and
waits for a START condition. To avoid activating the
timeout function, it is necessary to maintain a
communication speed of at least 1kHz for the SCL
operating frequency. The default state of the timeout
function is enabled (bit 7 = high).
THERM
(PIN 4) AND ALERT
/THERM2
(PIN 6)
The TMP401 has two pins dedicated to alarm functions,
the THERM
and ALERT
/THERM2
pins. Both pins are
open-drain outputs that each require a pull-up resistor to
V+. These pins can be wire-ORed together with other
alarm pins for system monitoring of multiple sensors. The
THERM
pin provides a thermal interrupt that cannot be
software disabled. The ALERT
pin is intended for use as
an earlier warning interrupt, and can be software disabled,
or masked. The ALERT
/THERM2
pin can also be
configured for use as THERM2
, a second THERM
pin
(Configuration Register: AL/TH bit = 1). The default setting
configures pin 6 to function as ALERT
(AL/TH = 0).
The THERM
pin asserts low when either the measured
local or remote temperature is outside of the temperature
range programmed in the corresponding Local/Remote
THERM Limit Register. The THERM temperature limit
range can be programmed with a wider range than that of
the limit registers, which allows ALERT
to provide an
earlier warning than THERM
. The THERM
alarm resets
automatically when the measured temperature returns to
within the THERM temperature limit range minus the
hysteresis value stored in the THERM Hysteresis
Register. The allowable values of hysteresis are shown in
Table 9. The default hysteresis is 10癈. When the
ALERT
/THERM2
pin is configured as a second thermal
alarm (Configuration Register: bit 7 = 0, bit 5 = 1), it
functions the same as THERM
, but uses the temperatures
stored in the Local/Remote Temperature High/Low Limit
Registers to set its comparison range.
When ALERT
/THERM2
(pin 6) is configured as ALERT
(Configuration Register: bit 7 = 0, bit 5 = 0), the pin asserts
low when either the measured local or remote temperature
violates the range limit set by the corresponding
Local/Remote Temperature High/Low Limit Registers.
This alert function can be configured to assert only if the
range is violated a specified number of consecutive times
(1, 2, 3, or 4). The consecutive violation limit is set in the
Consecutive Alert Register. False alerts that occur as a
result of environmental noise can be prevented by
requiring consecutive faults. ALERT
also asserts low if the
remote temperature sensor is open-circuit. When the
MASK function is enabled (Configuration Register: bit 7 = 1),
ALERT
is disabled (that is, masked). ALERT
resets when
the master reads the device address, as long as the
condition that caused the alert no longer persists, and the
Status Register has been reset.
Measured
Temperature
THERM Limit and ALERT High Limit
ALERT Low Limit and THERM Limit Hysteresis
THERM
ALERT
SMBus ALERT
Read
Read
Time
Read
Figure 17. SMBus Alert Timing Diagram
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| TMP411 | 制造商:BB 制造商全稱:BB 功能描述:【1C Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction |
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| TMP411AD | 功能描述:板上安裝溫度傳感器 +/-1degC Remote and Local 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(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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