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TMP103AYFFR Scheda tecnica(PDF) 8 Page - Texas Instruments |
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TMP103AYFFR Scheda tecnica(HTML) 8 Page - Texas Instruments |
8 / 23 page 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 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated Product Folder Link(s): TMP103 |
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