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TMP139AIYAHT Scheda tecnica(PDF) 15 Page - Texas Instruments

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Il numero della parte TMP139AIYAHT
Spiegazioni elettronici  TMP139 0.5 째C Accuracy, JEDEC DDR5 Grade B, Digital Temperature Sensor With I2C and I3C Interface
PDF  58 Pages
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

TMP139AIYAHT Scheda tecnica(HTML) 15 Page - Texas Instruments

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S or Sr
0
SA
1
0
HID2
HID1
HID0
R/W=0
RA = Register Address [7:0]
ACK/NACK
Data(RA)
Data(RA+1)
ACK/NACK
ACK
ACK
ACK
...
ACK
Sr
0
SA
1
0
HID2
HID1
HID0
R/W=1
Data(RA+N)
Sr or P
NACK
Figure 7-7. I2C Read Operation
7.4.3.3 Host I2C Read Operation in Default Read Address Pointer Mode
The TMP139 provides a default read address pointer mode as shown in Figure 7-8 to read a specific register on
the I2C bus. Since the number of bytes to be sent by the host are two less than a standard I2C read operation,
this mode provides for a more efficient polling mechanism. The MR18 register, bit DEF_RD_ADDR_POINT_EN
is used to enable the mode and bits DEF_RD_ADDR_POINT_Start are used to set the default read address
pointer to a specific register in the register map. When enabled, the TMP139 shall set the internal read address
pointer to the specific register when there is a Stop condition on the bus.
Data(DEF_ADDR_POINTER)
Data(DEF_ADDR_POINTER+1)
ACK/NACK
ACK
ACK
...
ACK
S or Sr
0
SA
1
0
HID2
HID1
HID0
R/W=1
Data(DEF_ADDR_POINTER+N)
Sr or P
NACK
Figure 7-8. I2C Default Read Address Pointer Mode
There can be two specific cases in this mode of operation. In the first case as shown in Figure 7-9, there is a
normal I2C read preceding the default read mode. If a Stop precedes the Start, then the internal read address
pointer shall be set to the default address pointer and subsequent data reads shall result in the data bytes sent
by the TMP139 corresponding to the default read address pointer. If a Repeated Start is issued instead of a
Stop, then the TMP139 shall send data based on the default read address pointer.
www.ti.com
TMP139
SNIS217 – DECEMBER 2020
Copyright © 2021 Texas Instruments Incorporated
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