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PDF MPXY8040A6U Data sheet ( Hoja de datos )
| Número de pieza | MPXY8040A6U | |
| Descripción | Tire Pressure Monitoring Sensor Temperature Compensated | |
| Fabricantes | Motorola Inc | |
| Logotipo |  |
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Freescale Semiconductor
Technical Data
Tire Pressure Monitoring Sensor
Temperature Compensated
and Calibrated, Fully Integrated,
Digital Output
The Freescale Semiconductor MPXY8000 series sensor is an 8-pin tire
monitoring sensor which is comprised of a variable capacitance pressure
sensing element, a temperature sensing element, and an interface circuit (with
a wake-up feature) all on a single chip. It is housed in a Super-Small Outline
Package (SSOP), which includes a media protection filter. Specifically designed
for the low power consumption requirements of tire pressure monitoring
systems, it can combine with a Freescale Semiconductor remote keyless entry
(RKE) system to facilitate a low-cost, highly integrated system.
Detailed Description
The block diagram of the MPXY8000 series sensor is shown in Figure 1. The
pressure sensor is a capacitive transducer constructed using surface
micromachining, the temperature sensor is constructed using a diffused
resistor, and the interface circuit is integrated onto the same die as the sensors
using a standard silicon CMOS process.
The conditioning of the pressure signal begins with a capacitance to voltage
conversion (C to V) followed by a switched capacitor amplifier. This amplifier
has adjustable offset and gain trimming. The offset and gain are factory
calibrated, with calibration values stored in the EEPROM trim register. This
amplifier also has temperature compensation circuits for both sensitivity and
offset, which also are factory adjusted using the EEPROM trim register.
The pressure is monitored by a voltage comparator, which compares the
measured value against an 8-bit threshold adjusted by a serial input. By
adjusting the threshold and monitoring the state of the OUT pin the external
device can check whether a low-pressure threshold has been crossed, or
perform up to 8-bit A/D conversions.
The temperature is measured by a diffused resistor with a positive
temperature coefficient driven by a current source, thereby creating a voltage.
The room temperature value of this voltage is factory calibrated using the
EEPROM trim register. A two-channel multiplexer can route either the pressure
or temperature signal to a sampling capacitor that is monitored by a voltage
comparator with variable threshold adjust, providing a digital output for
temperature.
An internal low frequency, low power 5.4 kHz oscillator with a 14-stage
divider provides a periodic pulse to the OUT pin (divide by 16384 for 3 seconds).
This pulse can be used to wake up an external MCU to begin an interface with
the device. An additional 10-stage divider will provide a pulse every 52 minutes
which can be used to reset an external MCU.
The power consumption can be controlled by several operational modes
selected by external pins.
MPXY8000
Rev 1, 12/2004
MPXY8020A
MPXY8040A
TIRE PRESSURE
MONITORING SENSOR
MPXY8020A:
OPTIMIZED FOR 250 kPa – 450 kPa
MPXY8040A:
OPTIMIZED FOR 500 kPa – 900 kPa
SUPER SMALL OUTLINE PACKAGE
CASE 1352-03
PIN ASSIGNMENT
S1/VPP 1
VDD 2
VSS 3
OUT 4
8 SO
7 CLK
6 DATA
5 RST
8-pin Super Small Outline Package (SSOP)
ORDERING INFORMATION
Shipped In Rails
Shipped in Tape &
Reel
MPXY8020A6U
MPXY8040A6U
MPXY8020A6T1
MPXY8040A6T1
© Freescale Semiconductor, Inc., 2004. All rights reserved.
1 page  
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
reduce 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
undefined following power up of the device. The serial bit
counter can be reset by cycling either the SO pin or the
S1/VPP 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.
1 2345678
CLK
Data MSB BIT6 BIT5 BIT4 BIT3 BIT2 BIT1 LSB
Serial Data ∗
MSB BIT6 BIT5 BIT4 BIT3 BIT2 BIT1 LSB
DAR Load *
DAR *
Data
(*) Denotes Internal Signal
Figure 5. Serial Data Timing
Pressure Sensor Output
The pressure channel compares the output of its analog
measurement circuit to the D/A reference voltage. The device
is calibrated at two different nominal values depending on the
calibration option.
Temperature Sensor Output
The temperature channel compares the output of a
positive temperature coefficient (PTC) resistor driven by a
switched current source. The current source is only active
when the temperature channel is selected.
APPLICATIONS
Suggested application example is shown in Figure 6.
+
3.0 V
0.1 µF
VDD
MPXY8000
Series
Sensor
VSS
S1
S0
Data
CLK
RST
OUT
Optional
Motion
Sense
State Machine
or MCU
RF
Transmitter
Figure 6. Application Example
Sensor Devices
Freescale Semiconductor
MPXY8000
5
5 Page 
SENSOR CHARACTERISTICS (MPXY8040A)
Pressure Transfer Function
kPa = 5.0 x Output ± (Pressure Error)
Output = 8-bit digital pressure measurement (between 0-255)
T[°C] \ VDD[V]
–40
–20
0
25
70
100
125
Pressure Error [±kPa]: 50 kPa ≤ P < 500 kPa
2.1 2.3
2.5
2.7
3.0
80 75
70
70
70
70 60
55
55
55
60 50
45
45
45
55 45
40
40
40
70 55
50
50
50
80 70
65
65
65
90 85
80
80
80
T[°C] \ VDD[V]
–40
–20
0
25
70
100
125
Pressure Error [±kPa]: 500 kPa ≤ P ≤ 900 kPa
2.1 2.3
2.5
2.7
3.0
75 65
60
60
60
50 35
25
25
25
40 30
20
20
20
40 30
20
20
20
40 30
20
20
20
60 45
35
35
35
90 85
80
80
80
3.3
70
55
45
45
50
65
80
3.3
60
40
25
25
25
45
80
3.6
75
60
55
50
55
70
80
3.6
65
50
35
35
35
60
80
Areas marked in grey indicate the typical operating range.
(*) Output will max out (255 counts) at 1,275 kPa or higher, but pressure sensor output is not specified above 900 kPa.
Sensor Devices
Freescale Semiconductor
MPXY8000
11
11 Page | ||
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| PDF Descargar | [ Datasheet MPXY8040A6U.PDF ] | |
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