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TMP102AIDRLRG4 データシート(PDF) 11 Page - Texas Instruments

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部品番号 TMP102AIDRLRG4
部品情報  Low-Power Digital Temperature Sensor
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ホームページ  http://www.ti.com
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TMP102AIDRLRG4 データシート(HTML) 11 Page - Texas Instruments

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SCL
SDA
t
(LOW)
t
RC
t
FC
t
(HDSTA)
t
(HDSTA)
t
(HDDAT)
t
(SUDAT)
t
(HIGH)
t
(SUSTA)
t
(SUSTO)
t
(BUF)
S
S
P
P
t
RD
t
FD
TMP102
www.ti.com
SBOS397F – AUGUST 2007 – REVISED DECEMBER 2015
7.3.8 General Call
The TMP102 device responds to a two-wire general call address (000 0000) if the eighth bit is 0. The device
acknowledges the general call address and responds to commands in the second byte. If the second byte is
0000 0110, the TMP102 device internal registers are reset to power-up values. The TMP102 device does not
support the general address acquire command.
7.3.9 High-Speed (HS) Mode
In order for the two-wire bus to operate at frequencies above 400 kHz, the master device must issue an HS-
Mode master code (0000 1xxx) as the first byte after a START condition to switch the bus to high-speed
operation. The TMP102 device does not acknowledge this byte, but switches the input filters on SDA and SCL
and the output filters on SDA to operate in HS-mode, allowing transfers of up to 2.85 MHz. 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 TMP102 device switches the input and output filters back to fast-mode operation..
7.3.10 Timeout Function
The TMP102 device resets the serial interface if SCL is held low for 30 ms (typ) between a start and stop
condition. The TMP102 device releases the SDA line if the SCL pin is pulled low and waits for a start condition
from the host controller. To avoid activating the time-out function, maintaining a communication speed of at least
1 kHz for SCL operating frequency is necessary..
7.3.11 Timing Diagrams
The TMP102 device is two-wire, SMBus, and I2C-interface compatible. Figure 7, Figure 8, Figure 9, and
Figure 10 list the various operations on the TMP102 device. Parameters for Figure 7 are defined in the Timing
Requirements table. The bus definitions are defined as follows:
Acknowledge Each receiving device, when addressed, is obliged to generate an acknowledge bit. A device that
acknowledges must pull down the SDA line during the acknowledge clock pulse in such a way that
the SDA line is stable low during the high period of the Acknowledge clock pulse. Setup and hold
times must be taken into account. On a master receive, the termination of the data transfer can be
signaled by the master generating a not-acknowledge (1) on the last byte that has been transmitted
by the slave.
Bus Idle
Both SDA and SCL lines remain high.
Data Transfer The number of data bytes transferred between a START and a STOP condition is not limited and
is determined by the master device. The TMP102 device can also be used for single byte updates.
To update only the MS byte, terminate the communication by issuing a START or STOP
communication on the bus.
Start Data Transfer A change in the state of the SDA line, from high to low, when the SCL line is high, defines a
START condition. Each data transfer is initiated with a START condition.
Stop Data Transfer A change in the state of the SDA line from low to high when the SCL line is high defines a
STOP condition. Each data transfer is terminated with a repeated START or STOP condition.
Figure 7. Two-Wire Timing Diagram
Copyright © 2007–2015, Texas Instruments Incorporated
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