MPXY8020A6T1 데이터 시트보기 (PDF) - Freescale Semiconductor
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MPXY8020A6T1
Freescale Semiconductor
MPXY8020A6T1 Datasheet PDF : 16 Pages
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Table 1. Operating Modes
S1
S0
Operating Mode
0
0 Standby/Reset
0
1 Measure Pressure
1
0 Measure Temperature
1
1 Output Read
Pressure
Measure
System
OFF
ON
OFF
OFF
Circuitry Powered
Temp
Measure
System
A/D Output
Comp.
OFF
OFF
OFF
OFF
ON
OFF
OFF
ON
LFO
Oscill.
ON
ON
ON
ON
Serial Data
Counter
ACTIVE
RESET
RESET
ACTIVE
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.
MPXY8020A
VDD
VSS
To Other VDD Loads
0.1 µF
VDD
To Power Supply
VSS
To Other VSS Returns
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.
OUT
2/f LFO
2/f LFO
Operation
Measure
Standby
Measure
3 Sec
Wake Up
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.
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.
Sensor Devices
Freescale Semiconductor
MPXY8000
3
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