NXP Semiconductors
FXTH87E
FXTH87E, Family of Tire Pressure Monitor Sensors
FXTH87ERM
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Reference manual
Rev. 5.0 — 4 February 2019
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Six-channel, 10-bit analog-to-digital converter (ADC10) with two external
I/O inputs
•
8-bit MCU
–
S08 Core with SIM and interrupt
–
512 RAM
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16 KB FLASH
–
64-byte, low-power, parameter registers
•
Dedicated state machines to sequence routine measurement and transmission
processes for reduced power consumption
•
Internal 315-/434-MHz RF transmitter
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External crystal oscillator
–
PLL-based output with fractional-n divider
–
OOK and FSK modulation capability
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Programmable data rate generator
–
Manchester, Bi-Phase or NRZ data encoding
–
256-bit RF data buffer variable length interrupt
–
Direct access to RF transmitter from MCU for unique formats
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Low-power consumption
•
Differential input LF detector/decoder on independent signal pins
•
Seven multipurpose GPIO pins
–
Four pins can be connected to optional internal pullups/pulldowns and STOP4
wakeup interrupt
–
Two of seven pins can be connected to a channel on the ADC10
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Two of seven pins can be connected to a channel on the TPM1
•
Real-time Interrupt driven by LFO with interrupt intervals of 2, 4, 8, 16, 32, 64, or 128
ms
•
Free-running counter, low-power, wakeup timer and periodic reset driven by LFO
•
Watchdog timeout with selectable times and clock sources
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Two-channel general purpose timer/PWM module (TPM1)
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Internal oscillators
–
MCU bus clock of 0.5, 1, 2, and 4 MHz (1, 2, 4, and 8 MHz HFO)
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Low frequency, low power time clock (LFO) with 1 ms period
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Medium frequency, controller clock (MFO) of 8 μs period
•
Low-voltage detection
•
Normal temperature restart in hardware (over- or under-temperature detected by
software)
2.3 Configuration options
Table 1. Configuration options
Pressure range
Accelerometer
configuration
X-axis range
Z-axis range
Package
Z
N/A
–285 g to +400 g
–215 g to +305 g
100 to 500 kPa
XZ
–80 g to +90 g
–285 g to +400 g
Z
NA
–285 g to +400 g
–215 g to +305 g
100 to 900 kPa
XZ
–80 g to +90 g
–285 g to +400 g
98ASA00432D
(7 x 7 x 2.2 mm)
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