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參數(shù)資料
| 型號： | TMP401AIDGKTG4 |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 19/28頁 |
| 文件大?。?/td> | 881K |
| 描述： | IC TEMP SENSOR DGTL OUT 8-MSOP |
| 標(biāo)準(zhǔn)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(yuǎn)程（最大） |
| 拓?fù)洌?/td> | 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
19
SMBus ALERT FUNCTION
The TMP401 supports the SMBus Alert function. When pin
6 is configured as an alert output, the ALERT
pin of the
TMP401 may be connected as an SMBus Alert signal.
When a master detects an alert condition on the ALERT
line, the master sends an SMBus Alert command
(00011001) on the bus. If the ALERT
pin of the TMP401 is
active, the devices will acknowledge the SMBus Alert
command and respond by returning its slave address on
the SDA line. The eighth bit (LSB) of the slave address
byte indicates whether the temperature exceeding one of
the temperature high limit settings or falling below one of
the temperature low limit settings caused the alert
condition. This bit will be high if the temperature is greater
than or equal to one of the temperature high limit settings;
this bit will be low if the temperature is less than one of the
temperature low limit settings. See Figure 16 for details of
this sequence.
If multiple devices on the bus respond to the SMBus Alert
command, arbitration during the slave address portion of
the SMBus Alert command determines which device will
clear its alert status. If the TMP401 wins the arbitration, its
ALERT
pin becomes inactive at the completion of the
SMBus Alert command. If the TMP401 loses the
arbitration, the ALERT
pin remains active.
SHUTDOWN MODE (SD)
The TMP401 Shutdown Mode allows the user to save
maximum power by shutting down all device circuitry other
than the serial interface, reducing current consumption to
typically less than 3礎(chǔ); see Figure 10, Shutdown
Quiescent Current vs Supply Voltage. Shutdown Mode is
enabled when the SD bit of the Configuration Register is
high; the device shuts down once the current conversion
is completed. When SD is low, the device maintains a
continuous conversion state.
SENSOR FAULT
The TMP401 will sense a fault at the D+ input resulting
from incorrect diode connection or an open circuit. The
detection circuitry consists of a voltage comparator that
trips when the voltage at D+ exceeds (V+) 0.6V (typical).
The comparator output is continuously checked during a
conversion. If a fault is detected, the last valid measured
temperature is used for the temperature measurement
result, the OPEN bit (Status Register, bit 2) is set high, and,
if the alert function is enabled, ALERT
asserts low.
When not using the remote sensor with the TMP401, the
D+ and D inputs must be connected together to prevent
meaningless fault warnings.
GENERAL CALL RESET
The TMP401 supports reset via the Two-Wire General Call
address 00h (0000 0000b). The TMP401 acknowledges
the General Call address and responds to the second byte.
If the second byte is 06h (0000 0110b), the TMP401
executes a software reset. This software reset restores the
power-on reset state to all TMP401 registers, aborts any
conversion in progress, and clears the ALERT
and
THERM
pins. The TMP401 takes no action in response to
other values in the second byte.
IDENTIFICATION REGISTERS
The TMP401 allows for the Two-Wire bus controller to
query the device for manufacturer and device IDs to allow
for software identification of the device at the particular
Two-Wire bus address. The manufacturer ID is obtained
by reading from pointer address FEh. The device ID is
obtained by reading from pointer address FFh. The
TMP401 returns 55h for the manufacturer code and 11h for
the device ID. These registers are read-only.
FILTERING
Remote junction temperature sensors are usually
implemented in a noisy environment. Noise is most often
created by fast digital signals, and it can corrupt
measurements. The TMP401 has a built-in 65kHz filter on
the inputs of D+ and D to minimize the effects of noise.
However, a bypass capacitor placed differentially across
the inputs of the remote temperature sensor is
recommended to make the application more robust
against unwanted coupled signals. The value of the
capacitor should be between 100pF and 1nF. Some
applications attain better overall accuracy with additional
series resistance; however, this is setup-specific. When
series resistance is added, the value should not be greater
than 100&.
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