FXTH870x6：飞思卡尔高效能TPMS传感器手册

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飞思卡尔半导体（Freescale Semiconductor）的FXTH870x6是一款高度集成的胎压监测传感器，旨在提供高效能和精确度。该产品具有以下几个关键特性： 1. **压力传感器**：FXTH870x6配备了两种预校准的压力测量范围，分别是100-450千帕(kPa)和100-900 kPa，适应于不同车辆轮胎的压力监测需求。 2. **温度传感器**：为了确保全面的轮胎健康状态监控，该传感器集成了温度感应功能，有助于识别可能影响轮胎性能的温度变化。 3. **可选加速度计**：提供了XZ轴或Z轴的加速度计选项，具有可调整的偏移量设置，能够检测车辆行驶中的动态信息，如颠簸等。 4. **ADC10电压参考和多通道模拟至数字转换器**：内置的10位ADC10负责外部输入信号的采样，支持两个额外的输入通道，确保信号的精确转换。 5. **嵌入式微控制器(S08 Core)**：这款传感器采用带有SIM接口的8位MCU，拥有512 KB RAM和8 KB Flash，其中一部分用于存储出厂固件和校准数据。 6. **低功耗参数寄存器**：64字节的低功耗寄存器用于存储可自定义的运行参数，有助于优化设备功耗管理。 7. **高效状态机设计**：内部采用专门的状态机来序列化测量和传输过程，这显著降低了传感器在工作时的能耗。 8. **射频通信能力**：内置315/434 MHz射频发射器，允许传感器与接收器进行无线通信，实时发送胎压数据至车载系统或外部诊断设备。 FXTH870x6作为一款功能强大的TPMS（轮胎压力监测系统）传感器，结合了高精度的压力和温度测量、加速度计选项以及智能节能设计，为现代车辆提供了一体化的轮胎健康监控解决方案。它的设计旨在满足汽车制造商对于可靠性和低功耗的严苛要求，是现代车辆安全及舒适性的重要组成部分。

FXTH870x6

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16 Freescale Semiconductor, Inc.

ADC10

The internal asynchronous ADC10 clock is always used as the conversion clock. The ADC10 can continue operation during

STOP4 mode. Conversions can be initiated while the MCU is the STOP4 mode. All ADC10 module registers contain their reset

values following exit from STOP1 mode.

LFR

When the MCU enters STOP mode the detectors in the LFR will remain powered up depending on the states of the bits selecting

the periodic sampling. Refer to Section 12 for more details.

Bandgap Reference

The bandgap reference is enabled whenever the sensor measurement interface requires sensor or voltage measurements.

TPM1

When the MCU enters STOP mode, the clock to the TPM1 module stops and the module halts operation. If the MCU is configured

to go into STOP1 mode, the TPM1 module will be reset upon wakeup from STOP and must be re-initialized.

Voltage Regulator

The voltage regulator enters a low-power standby state when the MCU enters any of the STOP modes except STOP4 (LVDSE

= 1 or ENBDM = 1).

Temperature Sensor

The temperature sensor is powered up on command from the MCU.

Temperature Restart

When the MCU enters a STOP mode the temperature restart will remain powered up if the TRE bit is set. If the temperature restart

level is reached the MCU will restart from the reset vector.

3.5.5 RFM Module in STOP Modes

The RFM’s external crystal oscillator (XCO), bit rate generator, PLL, VCO, RF data buffer, data encoder, and RF output stage will

remain powered up in STOP modes during a transmission, or if the SEND bit has been set and DIRECT mode has been enabled.

RF Output

When the RFM finishes a transmission sequence the external crystal oscillator (XCO), bit rate generator, PLL, VCO, RF data

buffer, data encoder, and RF output stage will remain powered up if the SEND bit is set.

3.5.6 P-cell in STOP Modes

The P-cell is powered up only during a measurement if scheduled by the sensor measurement interface. Otherwise it is powered

down.

3.5.7 Optional g-Cell in STOP Modes

The g-cell is powered up only during a measurement if scheduled by the sensor measurement interface. Otherwise it is powered

down.

FXTH870x6

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18 Freescale Semiconductor, Inc.

4.3 MCU Register Addresses and Bit Assignments

The registers in the FXTH870x6 are divided into these four groups:

• Direct-page registers are located in the first 80 locations in the memory map; these are accessible with efficient direct

addressing mode instructions.

• The parameter registers begin at address $0050; these are also accessible with efficient direct addressing mode

instructions.

• High-page registers are used less often, so they are located above $1800 in the memory map. This leaves more room in the

direct page for more frequently used registers and variables.

• The nonvolatile register area consists of a block of 16 locations in FLASH memory at $FFB0:FFBF. Nonvolatile register

locations include:

— Three values that are loaded into working registers at reset

— An 8-byte back door comparison key that optionally allows the user to gain controlled access to secure memory.

Because the nonvolatile register locations are FLASH memory, they must be erased and programmed like other FLASH memory

locations.

Direct page registers are located within the first 256 locations in the memory map, so they are accessible with efficient direct

addressing mode instructions, which requires only the lower byte of the address. Bit manipulation instructions can be used to

access any bit in any direct-page register. Tab le 3 is a summary of all user-accessible direct-page registers and control bits.

Those related to the TPMS application and modules are described in detail in this specification.

The register names in column two of the following tables are shown in bold to set them apart from the bit names to the right. Cells

that are not associated with named bits are shaded. A shaded cell with a 0 indicates this unused bit always reads as a 0. Shaded

cells with dashes indicate unused or reserved bit locations that could read as 1s or 0s.

$DFEE:DFEF Vsm SMI

$DFF0:DFF1 Vtpm1ovf TPM1

$DFF2:DFF3 Vtpm1ch1 TPM1

$DFF4:DFF5 Vtpm1ch0 TPM1

$DFF6:DFF7 Vwuktmr PWU

$DFF8:DFF9 Vlvd Sys Ctrl - LVD

$DFFA:DFFB

Reserved

$DFFC:DFFD Vswi SWI opcode

$DFFE:DFFF Vreset

Sys Ctrl - POR, PRF, COP, LVD

Temp Restart, Illegal opcode or address

Table 3. MCU Direct Page Register Summary

AddressRegister NameBit 7654321Bit 0

$0000 PTAD

PTAD[4:0]

$0001 PTAPE

PTAPE[3:0]

$0002 Reserved

$0003 PTADD PTADD[3:0]

$0004 PTBD

PTBD[1:0]

$0005 PTBPE

PTBPE[1:0]

$0006 Reserved

$0007 PTBDD PTBDD[1:0]

$0008 Reserved

$0009 Reserved

$000A Reserved

$000B Reserved

$000C KBISC 0 0 0 0 KBF KBACK KBIE KBIMOD

Table 2. Vector Summary (continued)

User Vector Addr Vector Name Module Source

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