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TMP411-Q1 Datasheet(PDF) 22 Page - Texas Instruments

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Part # TMP411-Q1
Description  짹1째C Remote and Local Temperature Sensor With N-Factor and Series Resistance Correction
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMP411-Q1 Datasheet(HTML) 22 Page - Texas Instruments

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TMP411-Q1
SBOS527F – DECEMBER 2010 – REVISED NOVEMBER 2013
www.ti.com
SERIAL INTERFACE
READ/WRITE OPERATIONS
The TMP411-Q1 operates only as a slave device on
Accessing a particular register on the TMP411-Q1 is
either the two-wire bus or the SMBus. Connections to
accomplished by writing the appropriate value to the
either bus are made via the open-drain I/O lines, SDA
Pointer Register. The value for the Pointer Register is
and SCL. The SDA and SCL pins feature integrated
the first byte transferred after the slave address byte
spike suppression filters and Schmitt triggers to
with the R/W bit low. Every write operation to the
minimize the effects of input spikes and bus noise.
TMP411-Q1 requires a value for the Pointer Register
The TMP411-Q1 supports the transmission protocol
(see Figure 14).
for fast (1-kHz to 400-kHz) and high-speed (1-kHz to
When reading from the TMP411-Q1, the last value
3.4-MHz) modes. All data bytes are transmitted MSB-
stored in the Pointer Register by a write operation is
first.
used to determine which register is read by a read
operation. To change the register pointer for a read
SERIAL BUS ADDRESS
operation, a new value must be written to the Pointer
To communicate with the TMP411-Q1, the master
Register. This transaction is accomplished by issuing
must first address slave devices via a slave address
a slave address byte with the R/W bit low, followed
byte. The slave address byte consists of seven
by the Pointer Register byte. No additional data are
address bits, and a direction bit indicating the intent
required. The master can then generate a START
of executing a read or write operation. The address of
condition and send the slave address byte with the
the TMP411A-Q1 and TMP411D-Q1 is 4Ch (1001
R/W bit high to initiate the read command. See
100b).
Figure 15 for details of this sequence. If repeated
reads from the same register are desired, it is not
necessary to continually send the Pointer Register
bytes, because the TMP411-Q1 retains the Pointer
Register value until it is changed by the next write
operation. Note that register bytes are sent MSB-first,
followed by the LSB.
Table 12. THERM Hysteresis Register Format
THERM HYSTERESIS REGISTER (Read = 21h, Write = 21h, POR = 0Ah)
BIT #
D7D7
D6D6
D5D5
D4D4
D3D3
D2D2
D1D1
D0D0
BIT NAME
TH11
TH10
TH9
TH8
TH7
TH6
TH5
TH4
POR VALUE
0
0
0
0
1
0
1
0
22
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