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TMP103HYFFR bảng dữ liệu(PDF) 8 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  Low-Power, Digital Temperature Sensor with Two-Wire Interface in WCSP
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TMP103HYFFR bảng dữ liệu(HTML) 8 Page - Texas Instruments

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background image
Startup
Startof
Conversion
Delay
(1)
26ms
26ms
Measured
Temperature
T
HIGH
T
LOW
FHBit
(TransparentMode)
Read
Read
Time
Read
FLBit
(TransparentMode)
FHBit
(LatchMode)
FLBit
(LatchMode)
TMP103
SBOS545A
– FEBRUARY 2011 – REVISED MARCH 2011
www.ti.com
CONFIGURATION REGISTER
The latch bit (LC) in the configuration register is used
to latch the value of the flag bits (FH and FL) until the
The Configuration Register is an eight-bit read/write
master issues a read command to the configuration
register used to store bits that control the operational
register. The flag bits are set to '0' if a read command
modes
of
the
temperature
sensor.
Read/write
is received by the TMP103, or if LC = '0' and the
operations are performed MSB first. The format and
temperature is within the temperature limits. The
power-up/reset value of the Configuration Register is
power-on default values for these bits are FH = '0',
shown in Table 5. All registers are updated at the end
FL = '0', and LC = '0'.
of the data byte.
CONVERSION RATE
Table 5. Configuration and Power-Up/Reset
Format
The conversion rate bits, CR1 and CR0 located in the
Configuration Register, configure the TMP103 for
D7
D6
D5
D4
D3
D2
D1
D0
conversion
rates
of
8Hz,
4Hz,
1Hz,
or
ID
CR1
CR0
FH
FL
LC
M1
M0
0.25Hz
(default).
The
TMP103
has
a
typical
0
0
0
0
0
0
1
0
conversion time of 26ms. To achieve different
conversion rates, the TMP103 performs a single
conversion and then powers down and waits for the
TEMPERATURE WATCHDOG FUNCTION
appropriate delay set by CR1 and CR0. Table 6
The TMP103 contains a watchdog function that
shows the settings for CR1 and CR0.
monitors device temperature and compares the result
to the values stored in the temperature limit registers
Table 6. Conversion Rate Settings
(THIGH and TLOW) in order to determine if the device
CR1
CR0
CONVERSION RATE
temperature
is
within
these
set
limits.
If
the
temperature of the TMP103 becomes greater than
0
0
0.25Hz (default)
the value in the THIGH register, then the flag-high bit
0
1
1Hz
(FH) in the configuration register is set to '1'. If the
1
0
4Hz
temperature falls below value in the TLOW register,
1
1
8Hz
then the flag-low bit (FL) is set to '1'. If both flag bits
remain '0', then the temperature is within the
After power-up or general-call reset, the TMP103
temperature window set by the temperature limit
immediately
starts
a
conversion,
as
shown
in
registers, as shown in Figure 8.
Figure 9. The first result is available after 26ms
(typical).
The
active
quiescent
current
during
conversion is 40
μA (typical at +27°C, V+ = 1.8V). The
quiescent current during delay is 1.0
μA (typical at
+27
°C, V+ = 1.8V).
(1) Delay is set by CR1 and CR0.
Figure 9. Conversion Start
SHUTDOWN MODE (M1 =
'0', M0 = '0')
Shutdown mode saves maximum power by shutting
down all device circuitry other than the serial
interface, reducing current consumption to typically
less than 0.5
μA. Shutdown mode is enabled when
Figure 8. Temperature Flag Functional Diagram
bits M1 and M0 (in the Configuration Register) = '00'.
The device shuts down when the current conversion
is completed.
8
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Copyright
© 2011, Texas Instruments Incorporated
Product Folder Link(s): TMP103


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