NXP Semiconductors
FXTH87E
FXTH87E, Family of Tire Pressure Monitor Sensors
FXTH87ERM
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2019. All rights reserved.
Reference manual
Rev. 5.0 — 4 February 2019
158 / 183
Address
Routine
Description
E03C
Reserved
Reserved
E03F
TPMS_RF_SET_TX
Initiate RF transmission
E042
TPMS_RF_DYNAMIC_POWER
Adjusts PA for uniform power output
E045
TPMS_MSG_INIT
Initialization of the emulated serial communication
E048
TPMS_MSG_READ
Reading data from emulated serial interface
E04B
TPMS_MSG_WRITE
Writing data on emulated serial interface
E04E
TPMS_CHECKSUM_XOR
Calculates a checksum for given buffer in XOR
E051
TPMS_CRC8
Calculates CRC8 on portion of memory
E054
TPMS_CRC16
Calculates CRC16 on portion of memory
E057
TPMS_SQUARE_ROOT
Calculates square root
E05A
TPMS_READ_ID
Reads device ID stored in FLASH
E05D
TPMS_LF_ENABLE
Enable/Disable LF for Carrier or Data
E060
TPMS_LF_READ_DATA
Reading LF data
E063
[1]
TPMS_WIRE_AND_ADC_CHECK
Performs checks of internal bond wires
E066
TPMS_FLASH_WRITE
Write to FLASH
E069
TPMS_FLASH_CHECK
Performs checksum on NXP firmware FLASH
E06C
TPMS_FLASH_ERASE
Erases one page (512 bytes) of FLASH at a time
E06F
TPMS_READ_DYNAMIC_ACCEL
Offsets Z-axis acceleration with one of 15 steps
E072
TPMS_RF_ENABLE
Enable RFM
E075
TPMS_FLASH_PROTECTION
Lock out FLASH
E078
Reserved
Reserved
E07B
TPMS_MULT_SIGN_INT16
Multiple two signed 16-bit numbers together
E07E
TPMS_VREG_CHECK
Verify that external capacitor connected to V
REG
pin
E081
TPMS_PRECHARGE_VREG
Precharge external capacitor on V
REG
pin
E084
Reserved
Reserved
E087
TPMS_READ_ACCEL_CONT_START
Enable the TPMS_READ_ACCEL_CONT function.
E08A
TPMS_READ_ACCEL_CONT
Take continuous acceleration readings and store to assigned
location.
E08D
TPMS_READ_ACCEL_CONT_STOP
Disable the TPMS_READ_ACCEL_CONT function.
[1]
The Wire and ADC Check firmware routine is designed to return a conversion value of 0x00. In cases of combined elevated temperature and low battery
voltage, noise in the ADC system may result in a value above just above 0x00. Under these conditions, a false error result may be possible. Users are
advised to call the Wire and ADC Check in conditions of minimal noise in order to minimize the possibility of false error results. Characterizations indicate
the probability of false errors is minimized when the battery voltage is above 2.7V at any rated temperature, or when the battery voltage falls below 2.7V,
the temperature is below 85oC. It is recommended that when needed, the application call the Wire and ADC Check when the temperature is below 85oC
and battery voltage is above 2.2V at minimum.
16.2.1.2 FXTH87E dual XZ-axis firmware routines
The details on the use and execution of each firmware routine is documented in the
CodeWarrior project file that is supplied by NXP. Any future updates to these firmware
routines will be contained in that file. A summary of the firmware routines available is
given in
Table 162
.
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