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TMP103BYFFR bảng dữ liệu(PDF) 11 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  Low-Power, Digital Temperature Sensor with Two-Wire Interface in WCSP
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TMP103BYFFR bảng dữ liệu(HTML) 11 Page - Texas Instruments

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SCL
SDA
GND
V+
C
F
10nF
³
R
F
5k
£
W
SupplyVoltage
TMP103
TMP103
www.ti.com
SBOS545A
– FEBRUARY 2011 – REVISED MARCH 2011
TIMEOUT FUNCTION
The TMP103A sends data on the first byte and the
TMP103B sends data on the second byte. The
The TMP103 resets the serial interface if SCL is held
master must issue an acknowledge for each byte
low for 30ms (typ). The TMP103 releases the bus if it
read in order to read all of the TMP103 devices on
is pulled low and waits for a START condition. To
the bus; see Figure 15. If the master does not
avoid activating the timeout function, it is necessary
acknowledge each byte of data, the TMP103s stop
to maintain a communication speed of at least 1kHz
sending subsequent data for any remaining devices.
for SCL operating frequency.
Up to eight TMP103 devices can be on the same bus
and respond to MDA commands; see Table 9.
MULTIPLE DEVICE ACCESS
NOTE: If the bus contains an incomplete sequence of
The
TMP103
supports
Multiple
Device
Access
TMP103 device addresses, the master must transmit
(MDA), which allows the master to communicate with
all required dummy bytes for the missing device
multiple TMP103 devices on the same bus interface
address to allow for normal MDA read operation. For
with one interface transaction. MDA commands
example, if the TMP103A, TMP103B, and TMP103D
consist of an MDA read address (00000001) and an
devices are on the bus, the master must transmit an
MDA
write
address
(00000000).
The
device
MDA read address followed by four bytes and four
acknowledges the MDA address and responds to the
acknowledges in order to complete the MDA read
command accordingly. In order for MDA to function
transaction.
correctly, different product versions of the TMP103
must be used in the system; see Table 9.
NOISE
Multiple Device Access Write
The TMP103 is a very low-power device and
The master transmits an MDA write address followed
generates very low noise on the supply bus. Applying
by the pointer address of the register to be accessed;
an RC filter to the V+ pin of the TMP103 can further
see Table 2. Following the pointer, all of the TMP103
reduce any noise the TMP103 might propagate to
devices on the bus acknowledge and wait for the next
other components. RF in Figure 10 should be less
byte of data to be written to the addressed registers.
than 5k
Ω and CF should be greater than 10nF.
When the data byte is received by the TMP103
devices, they store and acknowledge the transmitted
byte. The TMP103s store the same data on all
devices on the bus in one transaction; see Figure 14.
Multiple Device Access Read
Note that before an MDA read transaction can begin,
the master must first send an MDA write transaction
in order to set the appropriate pointer address of the
register to be accessed, as stated in the previous
section. The master can then transmit an MDA read
address followed by a read byte for each TMP103
used on the bus. For example, if a TMP103A and
TMP103B are used on the same bus and an MDA
read address is sent, the address must be followed
Figure 10. Noise Reduction
by two bytes of data and two master acknowledges.
Copyright
© 2011, Texas Instruments Incorporated
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