SP40T datasheet(53/71 Pages) INFINEON

53 / 71 page

Data Sheet

Revision1.1

2020-05-14

SP40T

Tire Pressure Monitoring Sensor

Functional Descriptions

Figure 5-16 Carrier pulse detection timing

LF wake-up pattern recognition

The LF receiver can be configured for recognition of one or two different wake-up patterns. The pattern length is

either 8 or 16 bit. Following registers are associated with this function:

• LFDPCFG (for definition of pattern number (one or two) and pattern length)

• LFDP0L and LFDP0H (definition of pattern 0)

• LFDP1L and LFDP1H (definition of pattern 1)

Synchronization pattern

The LF receiver expects a fixed synchronization pattern which cannot be changed. It is shown in Figure 5-17. The

synchronization pattern contains code violations with regard to Manchester coded data in order not to be mixed

up with data bytes.

LF data reception

The LF receiver can receive Manchester coded data bytes. The data is stored in a 7 byte data buffer. If more than

7 bytes are received the buffer is overwritten (ring buffer). The receiver can be configured for wake-up after a data

byte has been written into a user-defined address of the data buffer.

Following registers are associated with data reception:

• LFDRXBYTE0 to LFDRXBYTE6 (data buffer)

• LFDERRORFLAGS (indicates overwriting condition for each data register)

• LFDSTATUSFLAGS (indicates pending data for each data register)

Receiver

ON -Time

LF Carrier I:

detected

Settling time

3. 9 ms (±5 %)

Inhibit time

3.74 ms (±5%)

Hold time

2.84 ms (±5%)

Active carrier > 450 µs

t PULSE

Waiting

Hold Counter

Measurement phase

Hold time

restarted

Hold time

restarted

Receiver

ON -Time

Settling time

3. 9 ms (±5 %)

Inhibit time

3.74 ms (±5%)

Hold time

2.84 ms (±5%)

Waiting

Hold Counter

LF CarrierII:

not detected

Inhibit time

3. 74 ms (±5%)

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