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MAX1463 Datasheet(PDF) 12 Page - Maxim Integrated Products |
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MAX1463 Datasheet(HTML) 12 Page - Maxim Integrated Products |
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12 / 49 page  Low-Power Two-Channel Sensor Signal Processor 12 ______________________________________________________________________________________ Typical Application Circuit Analog ratiometric output configuration (Figure 2) pro- vides an output that is proportional to the power-supply voltage. Ratiometricity is an important consideration for automotive, battery-operated instruments, and some industrial applications. Detailed Description The MAX1463 is a highly integrated, low-power, two- channel sensor signal processor optimized for industri- al and process control applications, such as pressure sensing and compensation, RTD and thermal-couple linearization, weight sensing and classification, and remote process monitoring with limit indication. The MAX1463 incorporates a 16-bit CPU, user-pro- grammable 4kB of FLASH memory, 128 bytes of FLASH user information, 16-bit ADC, two 16-bit DACs, two 12-bit PWM digital outputs, four rail-to-rail op amps, SPI interface, two GPIOs, and one on-chip temperature sensor. Each sensor signal can be amplified, compensated for temperature, linearized, and the offset and full scale can be adjusted to the desired value. The MAX1463 can provide outputs as analog voltage (DAC) or digital (PWM, GPIOs), or simple on/off alarm indication (GPIOs). The uncommitted op amps can be used to provide 4–20mA outputs or for additional gain and fil- tering. Each DAC output is routed to either a small or large op amp. Large op amps are capable of driving heavier external loads. The unused circuit functions can be turned off to save power. All sensor linearization and on-chip temperature com- pensation is done by a user-defined algorithm stored in FLASH memory. The user-defined algorithm is pro- grammed over the serial interface and stored in 4kB of integrated FLASH memory. The MAX1463 uses an internal 4MHz oscillator or an externally supplied 4MHz clock. CPU code execution and ADC operation is fully synchronized to minimize the noise interference of a CPU-based sensor proces- sor system. The internal clock can be routed off chip for driving external circuit components to maintain system synchronization and to avoid clock-beat noise often found in multiclock systems. The CPU sequentially exe- cutes instructions stored in FLASH memory. Sensor Input The MAX1463 provides two differential signal inputs, INP1-INM1 and INP2-INM2. These inputs can also be configured as four singled-ended signals. Each input can have a common-mode range from VDD to VSS and a programmable gain range of 0.94V/V to 240V/V. The differential input signals are summed with the output of the coarse offset DAC (CO DAC) for offset correction prior to being amplified by the programmable gain amplifier (PGA). The resulting signal is applied to the differential input of the ADC for conversion. DO DI SCLK CS tCSS tCL tCH tCSH tSC tCS tDS tDH tDS tDH tCSI tCSS tCL tCH tSC tCSH tDO tTR tDV tDV tDO tTR Figure 1. Serial Interface Timing Diagram |
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