1 General description

The NTM88 family consists of small (4 mm x 4 mm x 1.98 mm), fully integrated tire pressure monitoring sensors (TPMS). The devices described in this data sheet, NTM88Jxx5S, provide low transmitting power consumption, large customer memory size, and single- or dual-axis accelerometer architecture. The NTM88Jxx5S TPMS solution integrates an 8-bit microcontroller (MCU), pressure sensor, accelerometers in four ranges, programmable RF transmitter and flexible LF receiver. The sensor supports seven GPIOs, client SPI, and a 2-channel timer / pulse-width module.

2 Features and benefits

• Optional pressure ranges1

• Optional accelerometer ranges: See Section 3.

• Transducer measurement interfaces with low-power AFE:

– 10-bit compensated pressure sense element

– 10-bit compensated accelerometers

– 8-bit compensated internal device temperature measurement

– 8-bit compensated internal device voltage measurement

– Two I/O pins can be used for external signals

• 8-bit S08 compact instruction set controller:

– 64 bytes low-power “always on“ NVM parameter registers

– 512 bytes SRAM

– 16 kB flash memory (512 bytes reserved for NXP coefficients)

– Family of NXP firmware libraries available via royalty-free license

• Programmable RF transmitter

– Characterized for RF carrier typical of 315 MHz or 434 MHz

– Characterized for FSK in ~3 kHz increments or OOK modulation

– Characterized for baud rate examples of 9.6 kbp/s, 19.2 kbp/s, and 38.4 kbp/s

• Flexible 125 kHz LF receiver:

– Capability for ASK or OOK demodulation

– Automated Manchester decoding

• Two channel timer / pulse-width module

• Client SPI to support host access to internal peripherals, registers, and memory

• Seven GPIOs with programmable multiplexing to support software development, external analog voltage input, timer, SPI, and wake-up

• Qualified in compliance with AEC-Q100, Rev. H

• Long battery service life

• Internal temperature sensor

• Internal voltage sensor

• Six-channel, 8-, 10-, or 12-bit analog-to-digital converter (ADC10) with two external I/O inputs

• Internal 315-/434-M Hz RF transmitter

– External crystal oscillator

– PLL-based output with fractional-n divider

– OOK and FSK modulation capability

– 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

– Low-power consumption

• Differential input LF detector/decoder on independent signal pins

• Real-time Interrupt driven by LFO with intervals of 2, 4, 8, 16, 32, 64, or 128 ms

• Free-running counter, low-power, wake up timer and periodic reset driven by LFO

• Watchdog timeout with selectable times and clock sources

• Two-channel general-purpose timer/PWM module (TPM1)

• Internal oscillators

– MCU bus clock of 0.5, 1, 2, and 4 MHz (1, 2, 4, and 8 MHz HFO)

– Low frequency, low-power time clock (LFO) with 1 ms period

– Medium frequency, controller clock (MFO) of 8 μs period

• Low-voltage detection