NXP Semiconductors
FXTH87E
FXTH87E, Family of Tire Pressure Monitor Sensors
FXTH87ERM
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Reference manual
Rev. 5.0 — 4 February 2019
7 / 183
4.2 Pin description
Table 4. Pin description
Symbol
Pin
Description
PTB1
1
General purpose I/O
PTA2
2
General purpose I/O
PTA1
3
General purpose I/O
PTA0
4
General purpose I/O
RESET
5
External reset
VSS
6
Digital circuit ground
VDD
7
Digital circuit supply voltage
VDDA
8
Analog circuit supply voltage
VSSA
9
Analog circuit ground
RFVSS
10
RF output amplifier ground
RF
11
RF energy data
VREG
12
External stabilization for analog circuits internal regulator
X1
13
External crystal
X0
14
External crystal
BKGD / PTA4
15
BACKGROUND DEBUG mode enable
LFB
16
LF receiver differential input channel B
LFA
17
LF receiver differential input channel A
PTA3
18
General purpose I/O
N/C
19, 20, 21,
22, 23
No Connect: Do not connect PCB pads to signal traces,
power/ground or multi-layer via.
PTB0
24
General purpose I/O
4.3 Recommended application
Example of a simple OOK/FSK tire pressure monitors using the internal PLL-based
RF output stage is shown in
Figure 5
. Any of the PTA[3:0] and PTB[1:0] pins can also
be used as general purpose I/O pins. Refer to
Section 7 "Reset, interrupts and system
configuration"
for details regarding pin multiplexing priorities. Any of the PTA[3:0] pins
that are not used in the application should be handled as described in
Section 8.1
"Unused pin configuration"
.
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