MPXY8040A6U Datasheet MPXY8040A6U, MPXY8040A6T1 | P4-P6

Sensors

4 Freescale Semiconductor

MPXY8000

The pulse lasts for two cycles of the LFO oscillator as shown

in Figure 4. Since the RST pin is clocked from the same

divider string as the OUT pin, there will also be a pulse on the

OUT pin when the RST pin pulses every 52 minutes.

Figure 4. Pulse on RST

S0 Pin

The S0 pin is used to select the mode of operation as

shown in Ta bl e 1 .

The S0 pin contains an internal Schmitt trigger as part of

its input to improve noise immunity. The S0 pin has an

internal pull-down device in order to provide a low level when

the pin is left unconnected.

S1 Pin

The S1 pin is used to select the mode of operation, as

shown in Ta bl e 1 .

The S1 pin contains an internal Schmitt trigger as part of

its input to improve noise immunity. This pin has an internal

pull-down device to provide a low level when the pin is left

unconnected.

The S1 pin also serves the purpose of enabling factory trim

and test of the device.

The higher V

programming voltage for the internal

EEPROM trim register is also supplied through the S1 pin.

DATA Pin

The DATA pin is the serial data in (SDI) function for setting

the threshold of the voltage comparator.

The DATA pin contains an internal Schmitt trigger as part

of its input to improve noise immunity. This pin has an internal

pull-down device to provide a low level when the pin is left

unconnected.

CLK Pin

The CLK pin is used to provide a clock used for loading

and shifting data into the DATA pin. The data on the DATA pin

is clocked into a shift register on the rising edge of the CLK

pin signal. The data is transferred to the D/A Register on the

eighth falling edge of the CLK pin. This protocol may be

handled by the SPI or SIOP serial I/O function found on some

MCU devices.

The CLK pin contains an internal Schmitt trigger as part of

its input to improve noise immunity. The CLK pin has an

internal pull-down device to provide a low level when the pin

is left unconnected.

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

Figure 4. Data is transferred into the serial shift register on

the rising edge of the CLK pin. On the falling edge of the 8

clock the data in the serial shift register is latched into the

parallel DAR register. The DAR remains powered up

whenever V

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.

OUT

RST

Standby

≈ 3 Sec

2/f

LFO

2/f

LFO

≈ 52 Minutes

Table 2. D/A Threshold Bit Assignment

Function Bit Weight Data Bit

LSB 1 D0

2D1

4D2

Voltage Comparator Threshold Adjust (8 bits) 8 D3

16 D4

32 D5

64 D6

MSB 128 D7

Sensors

Freescale Semiconductor 5

MPXY8000

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, t

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.

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.

Figure 6. Application Example

CLK

Data

Serial Data ∗

DAR Load *

DAR *

(*) Denotes Internal Signal

12345678

MSB

Data

BIT6 BIT5 BIT4 BIT3 BIT2 BIT1 LSB

3.0 V

0.1 µF

MPXY8000

Series

Sensor

Optional

State Machine

or MCU

Transmitter

CLK

RST

OUT

Data

Motion

Sense

Sensors

6 Freescale Semiconductor

MPXY8000

ELECTRICAL SPECIFICATIONS

Maximum ratings are the extreme limits to which the

device can be exposed without permanently damaging it. The

device contains circuitry to protect the inputs against damage

from high static voltages; however, do not apply voltages

higher than those shown in the table below. Keep V

and

OUT

within the range V

≤ (V

or V

OUT

) ≤ V

ELECTRO STATIC DISCHARGE (ESD)

WARNING: This device is sensitive to electrostatic

discharge.

Extra precaution must be taken by the user to protect the

chip from ESD. A charge of over 1000 volts can accumulate

on the human body or associated test equipment. A charge

of this magnitude can alter the performance or cause failure

of the chip. When handling the pressure sensor, proper ESD

precautions should be followed to avoid exposing the device

to discharges which may be detrimental to its performance.

Table 3. Maximum Ratings

Rating Symbol Value Unit

Supply Voltage V

–0.3 to +4.0 V

Short Circuit Capability (all pins excluding V

and V

)

Maximum High Voltage for 5 minutes

Minimum Low Voltage for 5 minutes

Substrate Current Injection

Current from any pin to V

–0.3 VDC) I

SUB

600 µA

Electrostatic Discharge

Human Body Model (HBM)

Charged Device Model (CDM)

Machine Model (MM)

ESD

±1000

±200

Storage Temperature Range

Standard Temperature Range T

stg

–40 to +150 °C

Table 4. Operating Range

These are the limits normally expected in the application which define range of operation.

Characteristic Symbol Min Typ Max Units

Supply Voltage V

2.1 3.0 3.6 V

Operating Temperature Range

Standard Temperature Range T

–40 —

+125 °C

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

STBY

READ

TEMP

PRESS

—

0.6

0.8

1.5

400

1400

1300

1200

0.9

1.2

2.2

600

1800

1700

µA

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P17

MPXY8040A6U

Mfr. #:

Buy MPXY8040A6U

Manufacturer:

NXP / Freescale

Description:

Board Mount Pressure Sensors TPMP 8-LD GULL WING

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MPXY8040A6U

MPXY8040A6U

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