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MPXY8020A Datasheet(PDF) 5 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) 5 Page - Motorola, Inc

 
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MPXY8020A
5
Motorola Sensor Device Data
Output Threshold Adjust
The state of the OUT pin is driven by a voltage comparator
whose output state depends on the level of the input voltage
on the sample capacitor and the level of an adjustable 8–bit
threshold voltage. The threshold is adjusted by shifting data
bits into the D/A Register (DAR) via the DATA pin while
clocking the CLK pin. The timing of this data is shown in Fig-
ure 6. Data is transferred into the serial shift register on the
rising edge of the CLK pin. On the falling edge of the 8th
clock the data in the serial shift register is latched into the
parallel DAR register. The DAR remains powered up when-
ever VDD is present. The serial data is clocked into the DATA
pin starting with the MSB first. This sequence of threshold
select bits is shown in Table 2.
Table 2. D/A Threshold Bit Assignments
Function
Bit Weight
Data Bit
LSB
1
D0
2
D1
4
D2
Voltage Comparator Threshold Adjust (8 bits)
8
D3
16
D4
32
D5
64
D6
MSB
128
D7
An analog to digital (A/D) conversion can be accomplished
with eight (8) different threshold levels in a successive
approximation algorithm; or the OUT pin can be set to trip at
some alarm level. The voltage on the sample capacitor will
maintain long enough for a single 8–bit conversion, but may
need to be refreshed with a new measured reading if the
read interval is longer than the specified hold time, tSH.
The counter that determines the number of clock pulses
into the device is reset whenever the device is placed into the
Measure Pressure or Measure Temperature Modes. This
provides a means to reset the data transfer count in case the
clock stream is corrupted during a transmission. In these two
modes the DATA and CLK pins should not be clocked to re-
duce noise in the captured pressure or temperature data.
Any change in the DAR contents should be done during the
Standby or Output Read Modes.
Both the serial bit counter and the state of the DAR are un-
defined following power up of the device. The serial bit count-
er can be reset by cycling either the SO pin or the S1 pin to a
high level and then back low. The DAR can then be reset to
the lowest level by holding the DATA pin low while bursting
the CLK pin with eight (8) clock pulses.
Figure 6. Serial Data Timing
CLK
Data
Serial Data ∗
DAR Load *
DAR *
( * ) Denotes Internal Signal
12
3
4
5
6
7
8
MSB
MSB
Data
BIT6
BIT5
BIT4
BIT3
BIT2
BIT1
LSB
BIT6
BIT5
BIT4
BIT3
BIT2
BIT1
LSB
Pressure Sensor Output
The pressure channel compares the output of its analog
measurement circuit to the D/A reference voltage. The de-
vice is calibrated at two different nominal values depending
on the calibration option.
Temperature Sensor Output
The temperature channel compares the output of a posi-
tive temperature coefficient (PTC) resistor driven by a
switched current source. The current source is only active
when the temperature channel is selected.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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