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TMP102 Scheda tecnica(PDF) 11 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
Il numero della parte TMP102
Spiegazioni elettronici  Low Power Digital Temperature Sensor With SMBus??Two-Wire Serial Interface in SOT563
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Produttore elettronici  BURR-BROWN [Burr-Brown (TI)]
Homepage  http://www.burr-brown.com
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TMP102 Scheda tecnica(HTML) 11 Page - Burr-Brown (TI)

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SMBus ALERT FUNCTION
HIGH-SPEED (Hs) MODE
TIMEOUT FUNCTION
NOISE
GENERAL CALL
TMP102
SCL
SDA
GND
V+
ALERT
ADD0
C
F
10nF
³
R
F
5k
£
W
SupplyVoltage
TMP102
SBOS397 – AUGUST 2007
The TMP102 supports the SMBus Alert function.
In
order
for
the
two-wire
bus
to
operate
at
When the TMP102 operates in Interrupt mode (TM =
frequencies above 400kHz, the master device must
'1'), the ALERT pin may be connected as an SMBus
issue an Hs-mode master code (00001xxx) as the
Alert signal. When a master senses that an ALERT
first byte after a START condition to switch the bus
condition is present on the ALERT line, the master
to high-speed operation. The TMP102 does not
sends an SMBus Alert command (00011001) to the
acknowledge this byte, but switches its input filters
bus.
If
the
ALERT
pin
is
active,
the
device
on SDA and SCL and its output filters on SDA to
acknowledges
the
SMBus
Alert
command
and
operate in Hs-mode, allowing transfers at up to
responds by returning its slave address on the SDA
3.4MHz. After the Hs-mode master code has been
line. The eighth bit (LSB) of the slave address byte
issued, the master transmits a two-wire slave
indicates if the ALERT condition was caused by the
address to initiate a data transfer operation. The bus
temperature exceeding THIGH or falling below TLOW.
continues to operate in Hs-mode until a STOP
For POL = '0', this bit is low if the temperature is
condition occurs on the bus. Upon receiving the
greater than or equal to THIGH; this bit is high if the
STOP condition, the TMP102 switches the input and
temperature is less than TLOW. The polarity of this bit
output filters back to fast-mode operation.
is inverted if POL = '1'. Refer to Figure 15 for details
of this sequence.
If multiple devices on the bus respond to the SMBus
The TMP102 resets the serial interface if SCL is held
Alert command, arbitration during the slave address
low for 30ms (typ). The TMP102 releases the bus if it
portion of the SMBus Alert command determines
is pulled low and waits for a START condition. To
which device will clear its ALERT status. The device
avoid activating the timeout function, it is necessary
with the lowest two-wire address wins the arbitration.
to maintain a communication speed of at least 1kHz
If the TMP102 wins the arbitration, its ALERT pin
for SCL operating frequency.
becomes inactive at the completion of the SMBus
Alert command. If the TMP102 loses the arbitration,
its ALERT pin remains active.
The TMP102 is a very low-power device and
generates very low noise on the supply bus.
Applying an RC filter to the V+ pin of the TMP102
The TMP102 responds to a two-wire General Call
can further reduce any noise the TMP102 might
address (0000000) if the eighth bit is '0'. The device
propagate to other components. RF in Figure 11
acknowledges
the
General
Call
address
and
should be less than 5k
Ω and C
F should be greater
responds to commands in the second byte. If the
than 10nF.
second byte is 00000110, the TMP102 internal
registers are reset to power-up values. The TMP102
does not support the General Address acquire
command.
Figure 11. Noise Reduction
11
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