NXP Semiconductors
FXTH87E
FXTH87E, Family of Tire Pressure Monitor Sensors
4.2 Pin description
Table 4.ꢀPin description
Symbol
PTB1
PTA2
PTA1
PTA0
RESET
VSS
Pin
1
Description
General purpose I/O
2
General purpose I/O
3
General purpose I/O
4
General purpose I/O
5
External reset
6
Digital circuit ground
VDD
7
Digital circuit supply voltage
Analog circuit supply voltage
Analog circuit ground
VDDA
VSSA
RFVSS
RF
8
9
10
11
12
13
14
15
16
17
18
RF output amplifier ground
RF energy data
VREG
X1
External stabilization for analog circuits internal regulator
External crystal
X0
External crystal
BKGD / PTA4
LFB
BACKGROUND DEBUG mode enable
LF receiver differential input channel B
LF receiver differential input channel A
General purpose I/O
LFA
PTA3
N/C
19, 20, 21, No Connect: Do not connect PCB pads to signal traces,
22, 23
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".
FXTH87ERM
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© NXP B.V. 2019. All rights reserved.
Reference manual
Rev. 5.0 — 4 February 2019
7 / 183
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