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MAX1463 Datasheet(PDF) 13 Page - Maxim Integrated Products |
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MAX1463 Datasheet(HTML) 13 Page - Maxim Integrated Products |
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13 / 49 page  Low-Power Two-Channel Sensor Signal Processor ______________________________________________________________________________________ 13 The CPU can be programmed to measure one or two differential inputs plus the internal temperature sensor defined in user-supplied algorithm. For example, the differential inputs may be measured many times while the temperature may be measured less frequently. On-Chip Temperature Sensing The on-chip temperature sensor is a diode that changes -2mV/°C over the operating range. The ADC converts the temperature sensor in a similar manner as the sensor inputs. During an ADC conversion of the temperature sensor, the ADC automatically uses the internal 1.25V reference as the ADC full-scale reference. The tempera- ture data format is 15-bit plus sign in two’s complement format. There is no programmable gain adjustment for the temperature sensor input. Offset compensation by the CO DAC is provided so that the nominal temperature measurement can be centered at the ADC output mid- scale value. Additional digital gain and offset correction can be provided by the CPU. Output Format There are two output modules in the MAX1463—DOP1 (DAC Op Amp PWM 1) and DOP2 (DAC Op Amp PWM 2). Each of the DOP modules contains a 16-bit DAC, a 12-bit digital PWM converter, a small op amp, and a large op amp with high-output drive capability. Each module can be configured in several different modes to suit a wide range of output signal requirements. Either the DAC or the PWM can be selected as the primary output signal. The DAC output signal must be routed to one of the two op amps before being made available to a device pin. See the DAC, Op Amp, PWM Modules section for details. Additional digital outputs are avail- able on the GPIOs; 4–20mA output format can be accomplished by using the unrouted op amp. Initialization A user-defined initialization routine is required to con- figure the oscillator frequency and, if necessary, vari- ous analog modules, e.g., PGA gain, ADC resolution, ADC clock settings, etc. After the initialization routine, the CPU can start execution of the main program. Power-On Reset The MAX1463 contains a POR circuit to disable CPU execution until adequate VDD voltage is available for operation. Once the power-on state has been reached, the MAX1463 is kept under reset condition for 250µs before the CPU starts execution. Below the VDD thresh- old, all internal CPU registers are set to their POR default state. Power-on control bits for internal modules are reset to the OFF condition. CPU Architecture The CPU provides a wide range of functionality to be incorporated in an embedded system. The CPU can compensate nonlinear and temperature-dependent sen- sors, check for over/underlimit conditions, output sensor or temperature data as an analog signal or pulse-width- modulated digital signal, and execute control strategies. The CPU can perform a limited amount of signal pro- cessing (filtering). A timer is included so that uniform sampling (equally spaced ADC conversions) of the input sensors can be performed. 5 VDC VDD SENSOR VSS VDDF OUTnSM OUT 0.47 µF 0.1µF 100pF INPn INMn GND 100 Ω MAX1463 Figure 2. Basic Bridge Sensor Ratiometric Output Configuration |
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