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MPXY8020A Datasheet(PDF) 3 Page - Motorola, Inc

Part No. MPXY8020A
Description  TIRE PRESSURE MONITORING SENSOR TEMPERATURE COMPENSATED AND CALIBRATED FULLY INTEGRATED DIGITAL OUTPUT
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Maker  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
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MPXY8020A Datasheet(HTML) 3 Page - Motorola, Inc

 
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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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