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DLVR-L60G Fiches technique(PDF) 5 Page - All Sensors Corporation |
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DLVR-L60G Fiches technique(HTML) 5 Page - All Sensors Corporation |
5 / 18 page All Sensors DS-0300 Rev A Operation Overview The DLVR is a digital sensor with a signal path that includes a sensing element, a 14 bit analog to digital converter, a DSP and an IO block that supports either an I2C or SPI interface (see Figure 1 below). The sensor also includes an internal temperature reference and associated control logic to support the configured operating mode. The sensing element is powered down while not being sampled to conserve power. Since there is a single ADC, there is also a multiplexer at the front end of the ADC that selects the signal source for the ADC. o T Zero Vs Gnd I2C/SPI rawP/ rawT Pressure Wake Temperature Sample Over Sample Enable Sensor P/T/Z Select 2 1 0 A D DSP Control Logic I/O Figure 1 - DLVR Essential Model The ADC performs conversions on the raw sensor signal (P), the temperature reference (T) and a zero reference (Z) during an ADC zero cycle. It also has an oversampling mode for a noise reduced output. A conversion cycle that is mesuring pressure is called a Normal cycle. A cycle where either a temperature measurement or zeroing is being performed is called a Special cycle. The DSP receives the converted pressure and temperature information and applies a multi-order transfer function to compensate the pressure output. This transfer function includes compensation for span, offset, temperature effects of span, temperature effects of offset and second order temperautre effects of both span and offset. There is also linearity compensa- tion for gage devices and front to back linearity compensation for differential devices. There are two effective operating modes of the sensor 1) Free Running and 2) Triggered. The control logic performs the synchronization of the internal functions according the factory programmed Power/Speed option (see Table 1). The Control Logic also determines the Delay between ADC samples, the regularity of the Special cycles and whether or not the ADC per- forms the Over Sampling. Refer to Figure 2 for the communication model associated with the operating modes listed below. Free Running Mode: In the free running mode, conversion cycles are initiated internally at regular intervals. There are three options available that operate in the Free Running mode (F, N and L). Two of these (F and N) run continuously while the third option (L) has an approximate 6 ms delay between conversion cycles. All three options have Special cycles inserted at regular intervals to accomplish the ADC zeroing and temperature measurements. Two of the options utilize oversampling. Refer to Table 1 for specific option controls. Triggered Mode: In the Triggered Mode, a conversion cycle is initiated by the user (or host uP). There are two availabe methods to wake the sensor from sleep mode. The first method (Wake All) is to wake the sensor and perform all three measurement cycles (Z, T and P). This provides completely fresh data from the sensor. The second method (Wake P) is to wake the sensor from sleep and only perform the pressure measurement (P).When using this second method, it is up to the user to interleave Wake All commands at regular intervals to ensure there is sufficiently up to date temperature information. Also, the Wake Pressure method is only available from the I2C interface (not available using a SPI interface). Page 5 |
Numéro de pièce similaire - DLVR-L60G |
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Description similaire - DLVR-L60G |
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