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MPXY8020A Datasheet(PDF) 3 Page - Freescale Semiconductor, Inc |
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MPXY8020A Datasheet(HTML) 3 Page - Freescale Semiconductor, Inc |
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3 / 17 page 
Sensors Freescale Semiconductor 3 MPXY8000 PIN FUNCTIONS The following paragraphs give a description of the general function of each pin. VDD and VSS Pins Power is supplied to the control IC through VDD and VSS. VDD is the positive supply and VSS is the digital and analog ground. The control IC operates from a single power supply. Therefore, the conductors to the power supply should be connected to the VDD and VSS pins and locally decoupled as shown in Figure 2. Figure 2. Recommended Power Supply Connections OUT Pin The OUT pin normally provides a digital signal related to the voltage applied to the voltage comparator and the threshold level shifted into an 8-bit register from an external device. When the device is placed in the standby mode the OUT pin is driven high and will be clocked low when an overflow is detected from a clock divider (divide by 16384) driven by the LFO. This allows the OUT pin to wake up an external device such as an MCU. Figure 3. Pulse on OUT Pin During Standby Mode RST Pin The RST pin is normally driven high and will be clocked low when an overflow is detected from total clock divider (divide by 16,777,216) driven by the LFO. This allows the RST pin to reset an external device such as an MCU. This pulse will appear on the RST pin approximately every 52 minutes regardless of the operating mode of the device. Table 1. Operating Modes S1 S0 Operating Mode Circuitry Powered Serial Data Counter Pressure Measure System Temp Measure System A/D Output Comp. LFO Oscill. 0 0 Standby/Reset OFF OFF OFF ON ACTIVE 0 1 Measure Pressure ON OFF OFF ON RESET 1 0 Measure Temperature OFF ON OFF ON RESET 1 1 Output Read OFF OFF ON ON ACTIVE To Other VDD Loads MPXY8020A VDD VSS 0.1 µF VDD VSS To Other VSS Returns To Power Supply 2/f LFO OUT Operation Wake Up Measure Standby Measure 3 Sec 2/f LFO |
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