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TMP108 Scheda tecnica(PDF) 9 Page - Texas Instruments |
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TMP108 Scheda tecnica(HTML) 9 Page - Texas Instruments |
9 / 21 page 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 Submit Documentation Feedback 9 Product Folder Links: TMP108 |
Codice articolo simile - TMP108_15 |
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Descrizione simile - TMP108_15 |
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