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TMP108 Scheda tecnica(PDF) 9 Page - Texas Instruments

Il numero della parte TMP108
Spiegazioni elettronici  Low Power Digital Temperature Sensor With Two-Wire Serial Interface in WCSP
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Startup
Start of
Conversion
Delay
(1)
27 ms
Start of
Conversion
Delay
(1)
27 ms
27 ms
TMP108
www.ti.com
SBOS663 – APRIL 2013
Thermostat Mode (TM)
The thermostat mode bit indicates to the device whether to operate in comparator mode (TM = '0') or interrupt
mode (TM = '1', default). For more information on comparator and interrupt modes, see the High- and Low-Limit
Registers section.
Temperature Watchdog Flags (FL and FH)
The TMP108 uses temperature watchdog flags in the configuration register that indicate the result of comparing
the device temperature at the end of every conversion to the values stored in the temperature limit registers
(THIGH and TLOW). If the temperature of the TMP108 exceeds the value in the THIGH register, then the flag-high bit
(FH) in the configuration register is set to '1'. If the temperature falls below the value in the TLOW register, then
the flag-low bit (FL) is set to '1'. If both flag bits remain '0', then the temperature is within the temperature range
set by the temperature limit registers. In interrupt mode, when any of the flags is set by an under- or
overtemperature event, the SMBus ALERT Response only clears the pin and not the flags. Reading the
configuration register clears both the flags and the pin.
Conversion Rate
The conversion rate bits, CR1 and CR0, configure the TMP108 for conversion rates of 0.25 Hz, 1 Hz, 4 Hz, or 16
Hz. The default rate is 1 Hz. The TMP108 has a typical conversion time of 27 ms. To achieve different
conversion rates, the TMP108 makes a conversion, and then powers down and waits for the appropriate delay
set by CR1 and CR0. Table 8 shows the settings for CR1 and CR0.
Table 8. Conversion Rate Settings
CR1
CR0
CONVERSION RATE
IQ (TYP)
0
0
0.25 Hz
1
μA
0
1
1 Hz (default)
2
μA
1
0
4 Hz
5
μA
1
1
16 Hz
18
μA
After power-up or a general-call reset, the TMP108 immediately starts a conversion, as shown in Figure 9. The
first result is available after 27 ms (typical). The active quiescent current during conversion is 40
μA (typical at
+25°C). The quiescent current during delay is 0.7
μA (typical at +25°C).
(1)
Delay is set by the CR1 and CR0 bits in the configuration register.
Figure 9. Conversion Start
Copyright © 2013, Texas Instruments Incorporated
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