NXP Semiconductors
FXTH87E
FXTH87E, Family of Tire Pressure Monitor Sensors
FXTH87ERM
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© NXP B.V. 2019. All rights reserved.
Reference manual
Rev. 5.0 — 4 February 2019
4 / 183
3 General Information
3.1 Overall block diagram
The block diagram of the FXTH87E is shown in
Figure 1
. This diagram covers all the
main blocks mentioned above and their main signal interactions. Power management
controls and bus control signals are not shown in this block diagram for clarity.
USER
FLASH
MEMORY
RAM
MEMORY
512
TPM1
TIMER/PWM
2-CHAN
LVD
RTI
TIMER
MCU CORE
S08
AVDD
TEMP
TEMP
SENSOR
AVDD
AVSS
PRESS
SENSOR
LFA
PTA1
ADC10
10-BIT
6-CHAN
BKGD/
PTA4
LFB
64-BYTE
PARAMETER
REGISTER
XI
XO
RF
MCU
TRANSDUCERS
TEMP
RESTART
OSC
BIT
RATE
GEN
256-BIT
DATA
BUFFER
DATA
ENCODE
XTAL
OSC
VOLT
REG
RF
AMP
VCO/PLL
FRACTL
DIVIDER
PWU
TIMER
MFO
8 s
RESET
DX
VSENS
VTP
BANDGAP
REF
V0
LFO
1 ms
LFI
SMI
GP
I/O
KBI
aaa-027989
KEYBOARD
WAKEUP
MFO
FIRMWARE
MEMORY
PTA0
P
SE
N
SO
R
M
EA
SU
R
EM
EN
T
IN
TE
R
FA
C
E
(S
M
I)
R
F
C
O
N
TR
O
LL
ER
LFO
LF
RECVR
(LFR)
RFM
VREG
PTA2
VDD
VDD
VSS
RVSS
PTA3
V
1
V2
RF LVD
AVDD
RFVDD
VREG
PTB0
PTB1
XZ
Z
XZ
ACCEL
(OPTION)
Z
ACCEL
(OPTION)
HFO
1, 2, 4,
or 8 MHZ
FREE-RUNNING
COUNTER
Figure 1. FXTH87E overall block diagram
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