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MPXY8020A Datasheet(PDF) 3 Page - Motorola, Inc |
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MPXY8020A Datasheet(HTML) 3 Page - Motorola, Inc |
3 / 16 page MPXY8020A 3 Motorola Sensor Device Data Operating Modes The device has several operating modes dependent on the applied voltages to the S1 and S0 pins as shown in Table 1. In all the modes listed the channel multiplexers, D/A Reg- ister, LFO, and the output pulse dividers will always be pow- ered up as long as there is a voltage source connected to the VDD pin. When only the S0 pin is at a logic one the pressure mea- suring circuit in the device is powered up and the pressure output signal is connected to the sample capacitor through a multiplexer. When the S0 pin returns to the low state the mul- tiplexer will first turn off to store the signal on the sample ca- pacitor before powering down the measuring circuitry. When only the S1 pin is at a logic one the temperature measuring circuit in the device is powered up and the tem- perature output signal is connected to the sample capacitor through a multiplexer. When the S1 pin returns to the low state the multiplexer will first turn off to store the signal on the sample capacitor before powering down the measuring cir- cuitry. NOTE: All of the EEPROM trim bits will be powered up re- gardless of whether the pressure or temperature measuring circuitry is activated. NOTE: If the voltage on the S1 pin exceeds 2.5 times the voltage on the VDD pin the device will be placed into its Trim/ Test Mode. NOTE: If the VDD supply source is switched off in order to reduce current consumption, it is important that all input pins be driven LOW to avoid powering up the device. If any input pin (S1, S0, DATA, or CLK) is driven HIGH while the VDD supply is switched off, the device may be pow- ered up through an ESD protection diode. In such a case, the effective VDD voltage will be about 0.3 V less than the voltage applied to the input pin, and the full device IDD current will be drawn from the device driving input. Table 1. Operating Modes Circuitry Powered S1 S0 Operating Mode Pressure Measure System Temp Measure System A/D Output Comp. LFO Oscill. Serial Data Counter 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 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 3. Figure 3. Recommended Power Supply Connections To Other VDD Loads MPXY8020A VDD VSS 0.1 µF VDD VSS To Other VSS Returns To Power Supply Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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