SP40T datasheet(21/71 Pages) INFINEON

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Data Sheet

Revision1.1

2020-05-14

SP40T

Tire Pressure Monitoring Sensor

Special Features of the SP40T

4.1

Operating Modes

Apart from normal operating mode the SP40T provides additional operating modes for debugging and

programming purposes. These additional operating modes can be selected by sending a proper I2C command

within a specified time interval after power on reset (POR). The I2C command starts with the device address (6CH)

followed by a code for the operating mode to be selected. If the SP40T does not receive any I2C command after

POR or a wrong command it starts up in normal operating mode (“Normal mode”).

4.2

Device states

In normal operation mode the SP40T can be switched into several device states which differ in the number of

enabled circuit blocks. For lowest power consumption unused blocks are disconnected from power supply,

hence not even idle currents remain.

Table 4-1 Operating Modes Overview

Operating mode Device

controlled by

Short Description

I2C

command1)

1) The complete I2C sequence is: [0x6C] [command high byte] [command low byte]

Normal mode

application

code

Normal operating mode for TPMS application

9876H

Program mode

external I2C-

Master

Used for programming application code and user

configuration data. Additional I2C commands allow reading

sensor measurement values.

1F5AH

Debug mode

external I2C-

Master

Used for application code development. Commands for

RAM read/write, program counter manipulation, execute

single step and run until breakpoint/interrupt are available.

FEDCH

Table 4-2 Device states overview

Device state

Short description

Important activated blocks

Run state

application code execution.

• CPU with 12 MHz RC-oscillator

• All other blocks can be activated if needed

Idle state1)

No code execution. Device is

waiting for a wake-up/resume

event. Fast recovery on wake-

up/resume event.

• 12 MHz CPU clock and CPU timer (CPU disabled)

•Optional: ADC

•Optional: TX-state machine, RF-transmitter

•Optional: Timer 0/1

• Optional: LF Receiver with 90 kHz oscillator

Deep idle state2)

No code execution. Device is

waiting for a resume event from

sampling timer or wake-up

event. Intended for equidistant

acceleration raw measurements.

• Wake-up controller with 2.2kHz RC-oscillator

• 90 kHz oscillator

•System controller

• Optional: LF-receiver

Power-down state No code execution. Device is

waiting for a wake-up event.

Lowest current consumption.

• Wake-up controller with 2.2kHz RC-oscillator

• Optional: LF-receiver with 90 kHz oscillator

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