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TSS400-S2 Datasheet(PDF) 9 Page - Texas Instruments |
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TSS400-S2 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 32 page TSS400-S2 µPOWER PROGRAMMABLE HIGH-PRECISION SENSOR SIGNAL PROCESSOR SLMS002 – D4101, OCTOBER 1993 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 measurement range and conversion formulas (continued) If the input voltage is below the lower limit (VImin), the value 00016 is returned. If the input voltage is above the upper limit (VImax), the value FFF16 is returned. The NEG status bit is set in both cases. The ZERO status bit is set if 00016 is returned. battery check Since the TSS400-S2 is ideal for battery applications, an internal supply voltage check is available. This operation is executed by the instructions ADJBATT and CHKBATT. ADJBATT measures the internal reference voltage and puts the results in the FLAC register. By setting the supply voltage at a minimum acceptable level and executing the ADJBATT instruction, a representative value is placed in the FLAC register. Saving this number in a storage register or EEPROM location enables it to be recalled for use by the CHKBATT instruction when the current supply voltage needs to be checked against the preset acceptable minimum. To perform these operations, an internal stable reference is connected to the input of the ADC and a measurement is made. Due to the ratiometric nature of the conversion, the measured value is an indication of the TSS400-S2 supply voltage. The ADJBATT instruction performs this operation and stores the result in the FLAC register. The CHKBATT instruction performs the same operation but compares the resulting measurement to the number in the FLAC register and sets the positive ( POS ) and negative ( NEG ) status bits according to the result. programmable current source A programmable current source ratiometric to SVDD is available for supplying a fixed current to the analog sensors. When turned on, the current source sends a constant current out of the addressed analog input ( An ). The voltage generated by the external sensor is measured with the same An input. The voltage used for A / D conversions and the reference voltage ( Vref) used to set the current of the current source are both proportional to SVDD and have a fixed ratio to one another. This ensures optimum tracking. The current source is activated by digit latch DL13. When DL13 is set to 1 and SVDD is on, the current source is on. When DL13 is set to 0, the current source is off. Figure 3 shows a diagram of the programmable current source. The current I is programmed by an external resistor Rext, which is connected between SVDD and Ri. This current is given by the following equation: I An + V Rext Rext VRext is approximately 0.24 × SVDD The programmable current range that the current source can supply to the ADC input is: 0.15 mA to 2.4 mA × (SVDD/V) V I + I An R I with R I + sensor resistance V I + V Rext R I Rext |
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