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MPXY8020A Datasheet(PDF) 3 Page - Freescale Semiconductor, Inc

Part No. MPXY8020A
Description  Tire Pressure Monitoring Sensor Temperature Compensated and Calibrated, Fully Integrated Digital Output
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MPXY8020A Datasheet(HTML) 3 Page - Freescale Semiconductor, Inc

 
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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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