EMC1413-1-AIZL-TR SMSC, EMC1413-1-AIZL-TR Datasheet - Page 14
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EMC1413-1-AIZL-TR
Manufacturer Part Number
EMC1413-1-AIZL-TR
Description
Board Mount Temperature Sensors SMBus Temp Sensor Selectable Address
Manufacturer
SMSC
Datasheet
1.EMC1413-A-AIA-TR.pdf
(49 pages)
Specifications of EMC1413-1-AIZL-TR
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Revision 1.38 (09-30-10)
5.1.3
5.1.4
5.1.5
DP2 / DN3
DN2 / DP3
VDD
DN1
DP1
1
2
3
4
5
The EMC1413-1 SMBus address is hard coded to 1001_100(r/w).
The EMC1413-3 SMBus address is hard coded to 0011_000(r/w).
The EMC1414-1 SMBus address is hard coded to 1001_100(r/w).
THERM Pin Considerations
Because of the decode method used to determine the SMBus Address, it is important that the pull-up
resistance on the THERM pin be within the tolerances shown in
resistor on the THERM pin must be connected to the same 3.3V supply that drives the VDD pin.
For 15ms after power up, the THERM pin must not be pulled low or the SMBus address will not be
decoded properly. If the system requirements do not permit these conditions, the THERM pin must be
isolated from its hard-wired OR’d bus during this time.
One method of isolating this pin is shown in
SMBus Data Bytes
All SMBus Data bytes are sent most significant bit first and composed of 8-bits of information.
SMBus ACK and NACK Bits
The SMBus client will acknowledge all data bytes that it receives. This is done by the client device
pulling the SMBus Data line low after the 8th bit of each byte that is transmitted. This applies to both
the Write Byte and Block Write protocols.
The Host will NACK (not acknowledge) the last data byte to be received from the client by holding the
SMBus data line high after the 8th data bit has been sent. For the Block Read protocol, the Host will
ACK each data byte that it receives except the last data byte.
EMC1413 /
EMC1414
PULL UP RESISTOR ON
Table 5.1 SMBus Address Decode (continued)
10
9
8
7
6
THERM PIN (±5%)
SMCLK
SMDATA
ALERT
THERM / ADDR
GND
Figure 5.2 Isolating THERM Pin
22k
33k
DATASHEET
Multiple Channel 1°C Temperature Sensor with Beta Compensation
14
Figure
+3.3V
SMBUS ADDRESS
0011_100(r/w)b
0111_100(r/w)b
4.7K – 33k
5.2.
Table
5.1. Additionally, the pull-up
SMSC EMC1413/EMC1414
+2.5 - 5V
Shared Therm
22K
Datasheet