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MPXY8021A Datasheet(PDF) 2 Page - Freescale Semiconductor, Inc

Part No. MPXY8021A
Description  Tire Pressure Monitoring Sensor Temperature Compensated and Calibrated, Fully Integrated, Digital Output
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MPXY8021A Datasheet(HTML) 2 Page - Freescale Semiconductor, Inc

 
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MPXY8021A
Sensors
2
Freescale Semiconductor
Figure 1. MPXY8021A Sensor Block Diagram
OPERATING MODES
The device has several operating modes dependent on
the applied voltages to the S1 and S0 pins as shown in
Table 1. In all the modes listed the channel multiplexers, D/A
Register, LFO, and the output pulse dividers will always be
powered up as long as there is a voltage source connected to
the VDD pin.
When only the S0 pin is at a logic one the pressure
measuring circuit in the device is powered up and the
pressure output signal is connected to the sample capacitor
through a multiplexer. When the S0 pin returns to the low
state the multiplexer will first turn off to store the signal on the
sample capacitor before powering down the measuring
circuitry.
When only the S1 pin is at a logic one the temperature
measuring circuit in the device is powered up and the
temperature output signal is connected to the sample
capacitor through a multiplexer. When the S1 pin returns to
the low state the multiplexer will first turn off to store the signal
on the sample capacitor before powering down the
measuring circuitry.
NOTE: All of the EEPROM trim bits will be powered up
regardless of whether the pressure or temperature
measuring circuitry is activated.
NOTE: If the voltage on the S1 pin exceeds 2.5 times the
voltage on the VDD pin the device will be placed into
its Trim/Test Mode.
NOTE: If the VDD supply source is switched off in order to
reduce current consumption, it is important that all
input pins be driven LOW to avoid powering up the
device.
If any input pin (S1, S0, DATA, or CLK) is driven HIGH
while the VDD supply is switched off, the device may be
powered up through an ESD protection diode. Such a case
should be avoided. The effective source voltage of the device
will be less than the applied voltage due to diode voltage
drop. In addition, the entire source current will be drawn from
the input pin.
8-Bit
Current
Source
+
-
f
LF
AVSS
AVSS
AVSS
Digital
Control
Power
Control
Clock
Gen
PX
PREF
P-Cell
C to V
Convert
AMP
fHF
Internal HF
OSC.
P-Off
Trim
P-Gain
Trim
P-TCO
Trim
P-TCS
Trim
T-Off
Trim
2-Chan
MUX
t
PTC
Res.
2-Chan
MUX
VDD
S1
S0
CLK
Data
RST
OUT
VSS
COMP
3-Chan
MUX
Lock
Internal LF
OSC.
14-Stage
Divider
Sample CAP
10-Stage
|Divider
8-Bit
D/A
Register


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