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ISL29501-CS-EVKIT1Z Datasheet(PDF) 9 Page - Intersil Corporation |
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ISL29501-CS-EVKIT1Z Datasheet(HTML) 9 Page - Intersil Corporation |
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9 / 23 page  ISL29501 9 FN8681.3 June 29, 2016 Submit Document Feedback The AFE in conjunction with the gain from the AGC loop allows for selection of different detectors in application design. The ADC relies on the automatic gain control loop to evaluate the optimal setting for data conversion. This prevents saturation when the target is at short range. Functional Overview The following paragraphs provide additional detail to the function of the important blocks in the ISL29501. Additional information may be available in the Related Literature on page 1. Power Supply Pins The ISL29501 will operate with a voltage range from 2.7V to 3.3V. There are three power rails: AVCC, DVCC and EVCC. The AVCC and DVCC supply the digital and analog part of circuits while the EVCC is dedicated to the emitter driver section. Intersil recommends decoupling the analog and digital supplies to minimize supply noise. Noise can be random or deterministic in nature. Random noise is decoupled like in any other system. Synchronous noise (4.5MHz) is seen as crosstalk by the chip and directly affects distance measurements. Crosstalk calibration will mitigate this but it is better to target this frequency directly, particularly on EVCC. Power-On Reset When power is first applied to the DVCC pin, the ISL29501 generates an internal reset. The reset forces all registers to their default values and sets the sequencer to an initial state. Chip Enable (CEn) Pin The CEn pin is an active low input pin. When asserted (pulled low), the device will bias the internal circuit blocks, band gaps, references and I2C interface. Once CEn is enabled writing 0x01 b0 = ‘1’ will disable the chip. It can be re-enabled by writing it back to ‘0’ providing CEn stays low. This allows software control. Register 0x01 defaults to 0 or enabled. Changing chip enable does not alter register values. Sample Start (SS) Pin Sample Start (SS) pin is an input logic signal, which triggers a measurement cycle. This signal is needed to start measurements in free run mode and for each measurement in single shot mode. If a trigger is received during an active measurement the request is ignored. Command Register The command Register (0xB0) allows the user to operate under software control. There are 3 commands that each perform useful functions without hardware interaction. • A soft-start can be initiated by writing 0xB0 to 0x49. This register bit emulates the single shot pin. This acts like the SS pin to start measurements. • A soft-reset can be initiated by writing 0xB0 to 0xD7. This action resets all registers to power-on default values with the exception of brownout bit. This function performs similar to the power cycle. • A soft-clear can be initiated by writing to 0xB0 to 0xD1, this stops all conversions and resets the accumulators and the sensor will stop if it is in continuous mode. This function is a sequencer reset. Interrupt (IRQ) Pin The ISL29501 can be configured to generate interrupts at the completion of a sensing cycle. This allows the host to perform other tasks while a measurement is running. The IRQ pin is an active low output logic pin. It is an open-drain output pin and requires a pull-up resistor to DVCC. The host should service the IRQ request by reading the 0x60 register. The register is cleared upon reading (self clear). If the sensor is set to signal sample mode, then the sensing stops and awaits for the next sample start signal. If the ISL29501 is set to continuous mode, then the IC will begin the next sensing sample according to the preconfigured sampling time period. Sampling Modes The ISL29501 provides two operating sample modes; single shot mode and continuous mode. Single Shot In single shot mode one measurement is made. The sampling period is normally not important since the MCU is controlling each measurement. The duration of the measurement is controlled by the integration time and the MCU latency. This allows the greatest flexibility of the measurement duty cycle and therefore the power consumption. Continuous Mode Continuous mode operation is used for systems where the sensor is continuously gathering data at a predefined integration and sampling period using the internal timing controller. This is the chip default. The data is available to the host after every sample period and the sensor will keep operating in this mode until changed by the MCU. If the interrupt is enabled the IRQ pin will toggle after each measurement. By adjusting the sample period and the sample period range (Registers 0x11 and 0x12) over 3.5 seconds between measurements is possible. For measurement intervals greater than this single shot mode must be used. TABLE 1. Reg0x13 SAMPLING MODES REGISTER BIT PREFERENCE MODE OF OPERATION 0x13[0] 0 Continuous sampling 0x13[0] 1 Single shot sampling |
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