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TMP421 Datenblatt(PDF) 21 Page - Texas Instruments

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Teilenummer TMP421
Bauteilbeschribung  짹1째C Remote and Local TEMPERATURE SENSOR in SOT23-8
PDF  30 Pages
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
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TMP421 Datenblatt(HTML) 21 Page - Texas Instruments

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Frame1Two-WireSlaveAddressByte
Frame2PointerRegisterByte
1
StartBy
Master
ACKBy
TMP421/22/23
ACKBy
TMP421/22/23
Frame3Two-WireSlaveAddressByte
Frame4DataByte1ReadRegister
StartBy
Master
ACKBy
TMP421/22/23
ACKBy
Master
From
TMP421/22/23
1
9
1
9
1
9
1
9
SDA
SCL
0
0
1
R/W
P7
P6
P5
P4
P3
P2
P1
P0
¼
¼
¼
¼
SDA
(Continued)
SCL
(Continued)
SDA
(Continued)
SCL
(Continued)
1
0
0
1
1
0
0
(1)
1
0
0
(1)
R/W
D7
D6
D5
D4
D3
D2
D1
D0
Frame5DataByte2ReadRegister
StopBy
Master
NACKBy
Master
(2)
From
TMP421/22/23
1
9
D7
D6
D5
D4
D3
D2
D1
D0
HIGH-SPEED MODE
TIMEOUT FUNCTION
TMP421
TMP422
TMP423
SBOS398B – JULY 2007 – REVISED MARCH 2008
(1) Slave address 1001100 shown.
(2) Master should leave SDA high to terminate a two-byte read operation.
Figure 19. Two-Wire Timing Diagram for Two-Byte Read Format
In order for the two-wire bus to operate at frequencies
The TMP421/22/23 reset the serial interface if either
above 400kHz, the master device must issue a
SCL or SDA are held low for 30ms (typical) between
High-Speed mode (Hs-mode) master code (0000
a START and STOP condition. If the TMP421/22/23
1xxx) as the first byte after a START condition to
are holding the bus low, the device releases the bus
switch
the
bus
to
high-speed
operation.
The
and waits for a START condition. To avoid activating
TMP421/22/23 do not acknowledge this byte, but
the timeout function, it is necessary to maintain a
switch the input filters on SDA and SCL and the
communication speed of at least 1kHz for the SCL
output filter on SDA to operate in Hs-mode, allowing
operating frequency.
transfers at up to 3.4MHz. After the Hs-mode master
code has been issued, the master transmits a
two-wire slave address to initiate a data transfer
operation. The bus continues to operate in Hs-mode
until a STOP condition occurs on the bus. Upon
receiving the STOP condition, the TMP421/22/23
switch the input and output filters back to fast mode
operation.
Copyright © 2007–2008, Texas Instruments Incorporated
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Product Folder Link(s): TMP421 TMP422 TMP423



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