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TMP112AIDRLR Arkusz danych(PDF) 9 Page - Texas Instruments |
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TMP112AIDRLR Arkusz danych(HTML) 9 Page - Texas Instruments |
9 / 25 page CONFIGURATION REGISTER CONVERSION RATE EXTENDED MODE (EM) Startup Startof Conversion Delay (1) 26ms 26ms ALERT (AL Bit) SHUTDOWN MODE (SD) THERMOSTAT MODE (TM) TMP112 www.ti.com ......................................................................................................................................................... SBOS473B – MARCH 2009 – REVISED JUNE 2009 The Configuration Register is a 16-bit read/write The conversion rate bits, CR1 and CR0, configure the register used to store bits that control the operational TMP112 for conversion rates of 8Hz, 4Hz, 1Hz, or modes of the temperature sensor. Read/write 0.25Hz. The default rate is 4Hz. The TMP112 has a operations are performed MSB first. The format and typical conversion time of 26ms. To achieve different power-up/reset values of the Configuration Register conversion rates, the TMP112 makes a conversion are shown in Table 7. For compatibility, the first byte and then powers down and waits for the appropriate corresponds to the Configuration Register in the delay set by CR1 and CR0. Table 8 shows the TMP75 and TMP275. All registers are updated byte settings for CR1 and CR0. by byte. Table 8. Conversion Rate Settings Table 7. Configuration and Power-Up/Reset CR1 CR0 CONVERSION RATE Formats 0 0 0.25Hz BYTE D7 D6 D5 D4 D3 D2 D1 D0 0 1 1Hz OS R1 R0 F1 F0 POL TM SD 1 0 4Hz (default) 1 0 1 1 0 0 0 0 0 1 1 8Hz CR1 CR0 AL EM 0 0 0 0 2 After a power-up or general-call reset, the TMP112 1 0 1 0 0 0 0 0 immediately starts a conversion, as shown in Figure 12. The first result is available after 26ms (typical). The active quiescent current during The Extended mode bit configures the device for conversion is 40 µA (typical at +27°C). The quiescent Normal mode operation (EM = 0) or Extended mode current during delay is 2.2 µA (typical at +27°C). operation (EM = 1). In Normal mode, the Temperature Register and high- and low-limit registers use a 12-bit data format. Normal mode is used to make the TMP112 compatible with the TMP75. Extended mode (EM = 1) allows measurement of temperatures above +128°C by configuring the Temperature Register, and high- and low-limit registers, for 13-bit data format. (1) Delay is set by CR1 and CR0. Figure 12. Conversion Start The AL bit is a read-only function. Reading the AL bit provides information about the comparator mode status. The state of the POL bit inverts the polarity of data returned from the AL bit. For POL = 0, the AL bit reads as '1' until the temperature equals or exceeds The Shutdown mode bit saves maximum power by THIGH for the programmed number of consecutive shutting down all device circuitry other than the serial faults, causing the AL bit to read as '0'. The AL bit interface, reducing current consumption to typically continues to read as '0' until the temperature falls less than 0.5 µA. Shutdown mode is enabled when below TLOW for the programmed number of the SD bit = '1'; the device shuts down when current consecutive faults, when it again reads as '1'. The conversion is completed. When SD = '0', the device status of the TM bit does not affect the status of the maintains a continuous conversion state. AL bit. The Thermostat mode bit indicates to the device whether to operate in Comparator mode (TM = 0) or Interrupt mode (TM = 1). For more information on Comparator and Interrupt modes, see the High- and Low-Limit Registers section. Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): TMP112 |
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