MPXY8021A MOTOROLA | Alldatasheet
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© Motorola, Inc. 2004 MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order Number: MPXY8021A Rev. 0, 07/2004 REV 0 Tire Pressure Monitoring Sensor Temperature Compensated and Calibrated, Fully Integrated, Digital Output General Description The Motorola MPXY8021A 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 Motorola remote keyless entry (RKE) system to facilitate a low-cost, highly integrated system. Detailed Description The block diagram of the MPXY8021A 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. MPXY8021A SUPER SMALL OUTLINE PACKAGE CASE 1352-03 PIN ASSIGNMENT TIRE PRESSURE MONITORING SENSOR MPXY8021A: OPTIMIZED FOR 250 kPa 450 kPa S1/VPP 1 VDD 2 VSS 3 OUT 4 8-pin Super Small Outline Package (SSOP) 8 SO
7 CLK
6 DATA
5 RST
ORDERING INFORMATION
Shipped In Rails Shipped in Tape & Reel MPXY8021A6U MPXY8021A6T1 Freescale Sem iconductor, I Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com nc...
Figure 1. MPXY8021A Sensor Block Diagram Freescale Semiconductor, Inc.
capacitor before powering down the measuring circuitry. capacitor before powering down the measuring circuitry. driven LOW to avoid powering up the device. Table 1. Operating Modes The following paragraphs give a description of the general function of each pin. Power is supplied to the control IC through VDD and VSS. ground. The control IC operates from a single power supply. Figure 2. Recommended Power Supply Connections Freescale Semiconductor, Inc.
the OUT pin to wake up an external device such as an MCU. Figure 3. Pulse on OUT Pin During Standby Mode Figure 4. Pulse on RST Pin EEPROM trim register is also supplied through the S1 pin. the threshold of the voltage comparator. SPI or SIOP serial I/O function found on some MCU devices.
3 Sec
Freescale Semiconductor, Inc.
sequence of threshold select bits is shown in Table 2. Table 2. D/A Threshold Bit Assignment bursting the CLK pin with eight (8) clock pulses. Figure 5. Serial Data Timing temperature channel is selected. Freescale Semiconductor, Inc.
MPXY8021A Motorola Sensor Device Data
APPLICATIONS
Suggested application example is shown in Figure 6. Figure 6. Application Example the table below. Keep VIN and VOUT within the range VSS ≤ (VIN or VOUT) ≤ VDD. Freescale Semiconductor, Inc.
Motorola Sensor Device Data MPXY8021A Operating Range The limits normally expected in the application which define range of operation. Characteristic Symbol Min Typ Max Units Supply Voltage V DD 2.1 3.0 3.3 V Operating Temperature Range Standard Temperature Range T A TL 40 TH +125 °C Pressure Operating Range MPXY8021A P 637.5 50 637.5 kPa Supply Current Drain Standby Mode −40°C to +85°C +85°C to +100°C +100°C to +125°C Read Mode −40°C to +125°C Measure Temperature Mode −40°C to +125°C Measure Pressure Mode −40°C to +10°C +10°C to +60°C +60°C to +125°C ISTBY ISTBY ISTBY IREAD ITEMP IPRESS IPRESS IPRESS 0.6 0.8 1.5 400 400 1400 1300 1200 0.9 1.2 2.2 600 600 1800 1700 1700 µA µA µA µA µA µA µA µA Freescale Sem iconductor, I Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com nc...
MPXY8021A Motorola Sensor Device Data
Electrical Characteristics
+2.1 V ≤ VDD ≤ +3.6 V, TL ≤ TA ≤ TH, unless otherwise specified. Figure 7. Temperature Error vs Temperature at VDD = 3.0 V Freescale Semiconductor, Inc.
+2.1 V ≤ VDD ≤ +3.6 V, TL ≤ TA ≤ TH, unless otherwise specified. Figure 8. Control Timing Test Load for OUT and RST Pins Freescale Semiconductor, Inc.
MPXY8021A Motorola Sensor Device Data SENSOR CHARACTERISTICS (MPXY8021A) Pressure Transfer Function kPa = 2.5 x Output ± (Pressure Error) Output = 8-bit digital pressure measurement (between 0-255) Pressure Error (±kPa): 50 kPa ≤ P < 250 kPa Pressure Error (±kPa): 250 kPa ≤ P ≤ 450 kPa Pressure Error (±kPa): 450 kPa < P ≤ 637.5 kPa Areas marked in grey indicate the typical operating range. Freescale Sem iconductor, I Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com nc...
MPXY8021A Motorola Sensor Device Data MECHANICAL SPECIFICATIONS Maximum Ratings Maximum ratings are the extreme limits to which the device can be exposed without permanently damaging it. Keep VIN and VOUT within the range VSS ≤ (VIN or VOUT) ≤ VDD. NOTES: 1. Tested for 5 minutes at 25°C. Media Compatibility Media compatibility is as specified in Motorola document SPD TPM Media Test. Rating Symbol Value Unit Maximum Pressure1 pmax 1400 kPa 1 Centrifugal Force Effects (3 axis) Pressure measurement change less than 1% FSS g CENT 2000 g Unpowered Shock (three sides, 0.5 mSec duration) g shock 2000 g Freescale Sem iconductor, I Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com nc...
Motorola Sensor Device Data MPXY8021A PACKAGE DIMENSIONS CASE 1352-03 ISSUE B DATE 04/14/04 .420 .400 .050 AM0.004 BC A B A0.006 BC
2 PLACES 4 TIPS
.300 .280 .300 .280 .025 .019 .014 .160 .140 GAGE PLANE DETAIL G .014.041 .031 .006 .000 NOTES: 1. CONTROLLING DIMENSION: INCH. 2. INTERPRET DIMENSIONS AND TOLERANCES PER ASME Y14.5M-1994. 3. DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH AND PROTRUSIONS SHALL NOT EXCEED 0.006 PER SIDE. 4. ALL VERTICAL SURFACES TO BE 5˚ MAXIMUM. 5. DIMENSION DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.008 MAXIMUM. C 0.004 DETAIL G SEATING PLANE .292 .272 .175 .155 .011 .009 CASE 1352-03 ISSUE B Freescale Sem iconductor, I Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com nc...
MPXY8021A Motorola Sensor Device Data NOTES Freescale Sem iconductor, I Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com nc...
Motorola Sensor Device Data MPXY8021A NOTES Freescale Sem iconductor, I Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com nc...
HOW TO REACH US: USA/EUROPE/LOCATIONS NOT LISTED : JAPAN: Motorola Japan Ltd.; SPS, Technical Information Center Motorola Literature Distribution 3-20-1 Minami-Azabu. Minato-ku, Tokyo 106-8573, Japan P.O. Box 5405, Denver, Colorado 80217 81-3-3440-3569 1-800-521-6274 or 480-768-2130 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Centre 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong 852-26668334 HOME PAGE: http://motorola.com/semiconductors MPXY8021A Information in this document is provided solely to enable system and software implementers to use Motorola products. There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the informa tion in this document. Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, represen tation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Typical parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may var y over time. All operating parameters, including Typicals must be validated for each customer application by customers technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as compon ents in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and di stributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of persona l injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufa cture of the part. MOTOROLA and the Stylized M Logo are registered in the US Patent and Trademark Office. All other product or service names are t he property of their respective owners. © Motorola, Inc. 2004 Freescale Sem iconductor, I Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com nc...