NXP Semiconductors UM11227 - Page 202

NXP Semiconductors
UM11227
NTM88 family of tire pressure monitor sensors
UM11227 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved.
User manual Rev. 6 — 24 April 2020
202 / 205
Fig. 31. Radio frequency transmission
randomization ................................................ 108
Fig. 32. Radio frequency transmission initial and
interframe time intervals ................................108
Fig. 33. LFSR implementation ....................................110
Fig. 34. Manchester data bit encoding (POL = 0) .......112
Fig. 35. Manchester data bit encoding (POL = 1) .......113
Fig. 36. Bi-Phase data bit encoding (POL = 0) ...........113
Fig. 37. Bi-Phase data bit encoding (POL = 1) ...........114
Fig. 38. Pre-charge diagram .......................................116
Fig. 39. VCO calibration state machine ......................117
Fig. 40. Analog to digital converter block diagram ......131
Fig. 41. Slave SPI state machine ...............................138
Fig. 42. SPI message response protocol ................... 138
Fig. 43. SPI signal timing diagram ............................. 139
Fig. 44. Sensor measurement interface block
diagram ..........................................................141
Fig. 45. Automatic measurement protocol ..................143
Fig. 46. Direct measurement protocol ........................ 144
Fig. 47. Initial and subsequent settling time protocol ...144
Fig. 48. Low power direct measurement protocol .......145
Fig. 49. System integration module block diagram .....153
Fig. 50. SIM reset exit diagram .................................. 154
Fig. 51. SIM MCU mode control .................................155
Fig. 52. Power management controller module block
diagram ..........................................................163
Fig. 53. Power management controller state
transition diagram ..........................................164
Fig. 54. Power management controller low voltage
detection transitions state diagram ................165
Fig. 55. FMC program and erase command flow
diagram ..........................................................171
Fig. 56. FMC burst program flow diagram ..................173
Fig. 57. Flash block protection protocol ......................175
Fig. 58. Battery check circuit ...................................... 188
Fig. 59. Example single axis accelerometer data flow
for measurements ......................................... 190
Fig. 60. Electrical schematic diagram .........................192
Fig. 61. Recommended power supply connections .... 193
Fig. 62. RESET pin timing ..........................................193