NXP FXTH87EG116T1

The FXTH87EK116 is a compact (7 x 7 mm), fully integrated tire pressure monitoring sensor (TPMS) featuring low transmission power consumption, large user memory capacity, and a dual-axis accelerometer architecture. This TPMS solution integrates an 8-bit MCU, a pressure sensor, an XZ-axis accelerometer, and an RF transmitter.

• Long battery life
• Power optimization software
• Pin-to-pin electrical compatibility with FXTH87-based customer applications
• Firmware subroutines compatible with FXTH87-based customer software
• Pressure sensor with one of three calibrated pressure ranges
• Temperature sensor
• Dual XZ-axis accelerometer with adjustable offset options
• Voltage reference measured by ADC10
• Six-channel, 10-bit ADC (ADC10) with two external I/O inputs
• 8-bit MCU
• S08 core with SIM and interrupts
• 512 RAM
• 16 kB flash memory
• 64-byte low-power parameter registers
• Dedicated state machine for sequencing routine measurements and transmissions to reduce power consumption
• Internal 315/434-MHz RF transmitter
• External crystal oscillator
• PLL-based output with fractional-N divider
• OOK and FSK modulation capability
• Programmable data rate generator
• Manchester, biphase, or NRZ data encoding
• 256-bit RF data buffer with variable-length interrupt
• Direct MCU access to RF transmitter for custom formats
• Low power consumption
• Differential input low-frequency detector/decoder on dedicated signal pins
• Seven multi-function GPIO pins
• Four pins connectable to optional internal pull-up/pull-down resistors and STOP4 wake-up interrupt
• Two of seven pins connectable to one ADC10 channel
• Two of seven pins connectable to one TPM1 channel
• Real-time interrupt driven by LFO with intervals of 2, 4, 8, 16, 32, 64, or 128 ms
• LFO-driven free-running counter, low-power wake-up timer, and periodic reset
• Watchdog timeout with selectable time and clock source
• Two-channel general-purpose timer/PWM module (TPM1)
• Internal oscillator
• MCU bus clock at 0.5, 1, 2, and 4 MHz (1, 2, 4, and 8 MHz HFO)
• Low-frequency, low-power clock (LFO) with 1 ms period
• Medium-frequency controller clock (MFO) with 8 μs period
• Low-voltage detection
• Ambient temperature restart in hardware (over/under temperature detected by software)