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TMP421 Datasheet(PDF) 17 Page - Texas Instruments

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Part # TMP421
Description  짹1째C Remote and Local TEMPERATURE SENSOR in SOT23-8
PDF  30 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMP421 Datasheet(HTML) 17 Page - Texas Instruments

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SERIAL BUS ADDRESS
Two-Wire Interface Slave Device Addresses
DX1
DX2
DX3
DX4
SCL
SDA
V+
Q0
Address=1001100
Address=1001101
Address=1001110
Address=1001111
Q1
Q2
Q3
Q4
Q5
V+
SCL
SDA
GND
Q7
DX1
DX2
DX3
DX4
V+
SCL
SDA
GND
DX1
DX2
DX3
DX4
V+
SCL
SDA
GND
DX1
DX2
DX3
DX4
V+
SCL
SDA
GND
Q6
TMP421
TMP422
TMP423
SBOS398B – JULY 2007 – REVISED MARCH 2008
DXN connection should be left unconnected. The
polarity of the transistor for external channel 2 (pins 3
To communicate with the TMP421/22/23, the master
and 4) sets the least significant bit of the slave
must first address slave devices via a slave address
address. The polarity of the transistor for external
byte. The slave address byte consists of seven
channel 1 (pins 1 and 2) sets the next least
address bits, and a direction bit indicating the intent
significant bit of the slave address.
of executing a read or write operation.
Table 9. TMP421 Slave Address Options
TWO-WIRE SLAVE
The TMP421 supports nine slave device addresses
ADDRESS
A1
A0
and
the
TMP422
supports
four
slave
device
0011 100
Float
0
addresses.
The
TMP423
has
one
of
two
0011 101
Float
1
factory-preset slave addresses.
0011 110
0
Float
The slave device address for the TMP421 is set by
0011 111
1
Float
the A1 and A0 pins according to Table 9.
0101 010
Float
Float
The slave device address for the TMP422 is set by
1001 100
0
0
the connections between the external transistors and
1001 101
0
1
the TMP422 according to Figure 15 and Table 10. If
1001 110
1
0
one of the channels is unused, the respective DXP
1001 111
1
1
connection should be connected to GND, and the
Table 10. TMP422 Slave Address Options
TWO-WIRE SLAVE ADDRESS
DX1
DX2
DX3
DX4
1001 100
DXP1
DXN1
DXP2
DXN2
1001 101
DXP1
DXN1
DXN2
DXP2
1001 110
DXN1
DXP1
DXP2
DXN2
1001 111
DXN1
DXP1
DXN2
DXP2
Figure 15. TMP422 Connections for Device Address Setup
Copyright © 2007–2008, Texas Instruments Incorporated
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Product Folder Link(s): TMP421 TMP422 TMP423



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