Infineon SP40PLUS Datasheet

Data Sheet Please read the Important Notice and Warnings at the end of this document Revision 1.2

www.infineon.com 2020-05-14

SP400-11-01

SP40PLUS

Tire Pressure Monitoring Sensor

Quality Requirement Category: Automotive

Features

• Patented Glass-Silicon-Glass MEMS pressure sensor with best-in-class media compatibility

• Calibrated pressure sensor for absolute air pressure measurement

• Z-axis accelerometer for motion detection and angular measurement

• Temperature and supply voltage sensors

• Industry-standard 8051 microcontroller with 12K of Flash memory

• System Controller with flexible wake-up and power management features

• RF Transmitter with fractional-N sigma-delta PLL

• Unique firmware functions for determination of angular wheel position, supporting tire localization (APS)

• LF Receiver allows carrier detection and modulated telegram reception

Applications

• Valve based TPMS-Modules

•OEM

•Aftermarket

•Retrofit

• In Tire TPMS Modules

Description

The SP40PLUS provides a very high level of integration, and is optimized to perform all of the functions necessary
to implement a state-of-the-art Tire Pressure Monitoring System (TPMS) sensor module. With its integrated micro
controller, sensors, and convenient peripherals, the SP40PLUS needs the addition of only a few passive
components and a battery to form a complete TPMS sensor assembly.

Figure 1

PG-DSOSP-14-82

SP40PLUS

Tire Pressure Monitoring Sensor

Table of Contents

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2 Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2 Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.3 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3.1 Pressure Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3.2 z-axis Acceleration Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.3.3 Temperature Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.3.4 Battery Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.3.5 Thermal Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.3.6 General Purpose Digital I/O Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.3.7 Voltage Monitoring and Power On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.3.8 Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.3.9 Supply Currents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.3.10 LF-Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.3.11 RF-Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.3.12 RC Oscillators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.3.13 Wake-up and power-on timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.1 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4 Special Features of the SP40PLUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.1 Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.2 Device states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.3 State Transitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5 Functional Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.1 SP40PLUS Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.2 Wake-up Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.2.1 Interval Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.2.2 LF ON-OFF Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.2.3 LF receiver wake-up/resume events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.2.4 General purpose I/O PP2 wake-up/resume event . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.2.5 Power-on and under-voltage reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5.2.6 Software reset, watchdog reset and flash error reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5.2.7 Thermal Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

5.3 System Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

5.3.1 Sampling Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

5.4 Clock Generators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

5.5 Core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

5.5.1 Timer Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5.5.2 Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Data Sheet 2 Revision 1.2
2020-05-14

SP40PLUS

Tire Pressure Monitoring Sensor

5.5.3 Hardware CRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

5.5.4 I2C Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

5.5.5 UART Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

5.6 Memories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

5.6.1 Lock-byte concept overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

5.6.2 Flash programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

5.6.3 Retention RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

5.6.4 Data RAM and SFRs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

5.6.5 Retention SFRs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

5.7 Power Supply and Reset Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

5.7.1 TX battery voltage detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

5.8 Measurement Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

5.9 RF transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

5.9.1 Manchester/Biphase Encoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

5.9.2 SD-PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

5.9.3 FSK Modulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

5.9.4 Gaussian filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

5.9.5 RF Power Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

5.9.6 ASK modulator and ASK ramping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

5.9.7 Crystal Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

5.9.8 RF Baud-Rate Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

5.10 RF Transmission Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

5.10.1 SOM and EOM Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

5.10.2 Voltage measurement at end of transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

5.11 LF Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

5.11.1 LF Analog Front End (AFE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

5.11.2 LF Digital baseband (DBB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

5.11.3 LF Telegram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

5.11.4 LF state machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

5.12 I/O-Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

6 Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

7 Data Sheet Reference Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

8 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

8.1 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

8.2 Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

8.3 Package axis definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Data Sheet 3 Revision 1.2
2020-05-14

SP40PLUS

Tire Pressure Monitoring Sensor

Introduction

1 Introduction

Measurements of pressure, acceleration, temperature, and battery voltage are performed under software
control, allowing the application software to format and prepare the data for RF transmission. An intelligent
system controller provides flexible wake-up capability in order to reduce energy usage. A calibrated Interval
Timer is included to permit periodic wake-up of the CPU, which in turn can then perform measurements and
transmit data to a receiver. The integrated Z-axis accelerometer may be used by the application software to
detect motion and distinguish between parking and driving situation.

The integrated microcontroller is instruction set compatible to the standard 8051 processor and is supported by
commercially available C compilers and IDE tool chains. The microcontroller core is supplemented with various
peripherals (e.g. hardware Manchester/BiPhase Encoder/Decoder, CRC Generator/Checker, I2C- and UART­interface) that enable an easy implementation of TPMS application software.

For user specific application code the SP40PLUS includes 12k of on-chip flash memory.

The RF Transmitter block covers both 315 and 434 MHz UHF bands and supports FSK and ASK modulation. The
transmitter contains a fractional-N sigma-delta PLL synthesizer which allows for precise control of carrier
frequency and accurate FSK frequency modulation. A flexible baseband encoder and advanced power
management techniques are used to hold the peak current consumption during RF transmission to a minimum.
An integrated autonomous LF Receiver allows the SP40PLUS to receive diagnostic or operating state commands,
supporting application features such as pressure-on-demand or tire position localization.

Finally, a comprehensive firmware library supports using all above mentioned hardware blocks effectively.
Especially a unique set of Angular Position Sensing (APS) functions allows calculating the instantaneous angular
position of the TPMS module relative to the car chassis which may be used for wheel localization on system level.

Data Sheet 4 Revision 1.2
2020-05-14

SP40PLUS

Tire Pressure Monitoring Sensor

Specification

2 Specification

2.1 Absolute Maximum Ratings

Table 1 Absolute Maximum Ratings

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

Max. Supply Voltage V

ESD robustness HBM V

ESD robustness CDM V

Latch up I

Input voltage V

Peak voltage at
PAOUT pin

DDmax

ESD_HBM

ESD_CDM

LU

In

V

In_LF

V

PAOUT_peak

-0.3 +3.8 V 1.1

-2000 2000 V All pins according to

1.2

EIA/JESD22-A114-B

-4000 4000 V PAOUT pin according to

1.3

EIA/JESD22-A114-B

-500 500 V All pins (According to ESDA

1.4

STM 5.3.1)

-750 750 V Corner pins (According to

1.5

ESDA STM 5.3.1)

-100 +100 mA AEC-Q100 (transient

1.6

current)

-0.3 VDD +

V PP0, PP1, PP2, PP3 1.7

0.3

-0.3 +1.8 V LFP, LFN, XIN 1.8

-0.3 +0.3 V Differential input at LFP

1.9

and LFN

8 V The matching network

1.10
must be designed such
that the peak-voltage at PA
does not exceed this value

Output short-circuit
capability

1)

V

SC

0 3.8 V Short to VDD, GND or

neighbor pin for max.

1.11

10min at VDD=3.8V. Note:

VDDREG and XOUT must
not be shorted to VDD

DC current I
Over pressure p
Burst pressure p
Static acceleration a

DC

max

burst

static

-10 10 mA all pins 1.13

2000 kPa static load 1.14

2000 kPa 10 times 1 sec 1.15

3000 g Device unpowered. Tested

1.16
in z-direction.

Data Sheet 5 Revision 1.2
2020-05-14

SP40PLUS

Tire Pressure Monitoring Sensor

Specification

Table 1 Absolute Maximum Ratings

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

Mechanical shock a

shock

6000 g 0.3 ms half sine pulses. 

1.17
5 shocks in +/- x,y,z­direction, respectively.
Device unpowered.

Storage temperature T

storage

-50 +150 °C Maximal 1000 hours

1.18
accumulated over
lifetime between 125°C
and 150°C. Device not
powered. Temperature
cycling only allowed
between -40°C and 125°C.

1) Refers to following pins: PP0 to PP3 if configured as output, XOUT, VDDREG, PAOUT and VDDPA. For input pins see
parameter input voltage.

Note: Absolute maximum ratings are values beyond recommended operating conditions. They describe

those conditions which the device can withstand for some limited time. After exposure to
maximum ratings the device will remain functional, but the reliability is no longer guaranteed.

Data Sheet 6 Revision 1.2
2020-05-14

SP40PLUS

Tire Pressure Monitoring Sensor

Specification

2.2 Operating Range

The operating range defines the ambient conditions where the device operates as specified. Certain specified
parameters in this data sheet may depend on additional operating conditions. These additional conditions are
indicated in the corresponding sections.

Table 2 Operating Range

Parameter Symbol Values Unit Note or

Test Condition

Supply Voltage

Min. Typ. Max.

1)

V

DD

VUVRA – 3.6 V Device not in power

down state

VUVRPD – 3.6 V Device in power down

state

Ambient Temperature T

Operating

T

Flash

-40 – 125 °C Normal Operation 3.3

-20 – 90 °C FLASH
programming/erasing

Extended
Temperature Range

T

EXT

-50 150 °C Thermal shutdown
functional. V
to 3.6 V. Exposure to
125°C...150°C maximal
24h over lifetime

z-axis Acceleration a

Operating

-1600 – 1600 g Exceeding this
acceleration will result
in a higher pressure
error as specified.

1) Supply voltage must be connected to VDDBAT pin.

DD

= V

UVRA

Number

3.1

3.2

3.4

3.5

3.6

Data Sheet 7 Revision 1.2
2020-05-14

SP40PLUS

Tire Pressure Monitoring Sensor

Specification

2.3 Characteristics

2.3.1 Pressure Sensor

Table 3 Pressure Sensor 500/750/900kPa Variant

1)2)

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

Input Pressure Range p

Random Error p
ADC resolution p

Measurement Error

3)

in

random

ADC_res

p

Error 100-500

100 900 kPa 7.1

-1.37 1.37 kPa 95% of all measurements 7.2

0.5 kPa/
LSB

1 LSB of a raw measurement
corresponds to 0.5 kPa or less

7.3

-5 5 kPa 0°C to +90°C 7.4

-7 7 kPa -20°C to 0°C

7.5

+90°C to +125°C

-9 9 kPa -40°C to -20°C 7.6

p

Error 500-750

-1.2 1.2 %

-1.6 1.6 %

4)

0°C to +90°C 7.7

4)

-20°C to 0°C

7.8

+90°C to +125°C

4)

-40°C to -20°C 7.9

p

Error 750-900

-2.0 2.0 %

-12 12 kPa 0°C to +125°C 7.10

-14 14 kPa -20°C to 0°C 7.11

-15 15 kPa -40°C to -20°C 7.12

1) Based on averaging two raw values for each measurement

2) Exceeding the maximum z-axis acceleration (parameter 3.6) as defined in the operating range will result in a higher
pressure measurement error than specified

3) The measurement error is understood as total error, including random error (noise)

4) Percentage of actual pressure value

Data Sheet 8 Revision 1.2
2020-05-14

SP40PLUS

Tire Pressure Monitoring Sensor

Specification

2.3.2 z-axis Acceleration Sensor

Table 4 z-axis Acceleration Sensor

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

Input acceleration
Range

Total Acceleration

1)

Error

Random error of
acceleration
compensated values

a

in

a

err_tot

a

rnd_comp_

16

-20 355 g Selectable by firmware function 12.1

-355 20 g 12.2

-6.5 
(-3.0)

-8.5
(-5.0)

-8.5
(-5.0)

-10.5
(-7.0)

-12.5
(-9.0)

-14.5
(-11.0)

-22.5
(-19.0)

-24
(-20.5)

-0.35 +0.35 g 99.7% of all measurements.

+6.5
(+3.0)

+8.5
(+5.0)

+8.5
(+5.0)

+10.5
(+7.0)

+12.5
(+9.0)

+14.5
(+11.0)

+22.5
(+19.0)

+24
(+20.5)

g|a

T = -40°C...90°C

g|a

T = 90°C...125°C

g|a

T = -40°C...90°C

g|a

T = 90°C...125°C

g|a

T = -40°C...90°C

g|a

T = 90°C...125°C

g|a

T = -40°C...90°C

g|a

T = 90°C...125°C

|=0g ... 20g

in

|=0g ... 20g

in

|>20g ... 100g

in

|>20g ... 100g

in

|>100g ... 200g

in

|>100g ... 200g

in

|>200g ... 355g

in

|>200g ... 355g

in

12.3

12.4

12.5

12.6

12.7

12.8

12.9

12.10

12.11
Averaging of 16 ADC-samples.
No external noise sources present.

ADC resolution a

ADC_res

0.057 0.175 g/

1 LSB of a raw measurement

LSB

corresponds to minimal 0.057g and

12.14

maximal 0.175g

Random error of
acceleration raw
values

Accelerometer
resonance frequency

a

rnd_raw_16

f

res_acc

-4 +4 LSB 99.7% of all measurements.
Averaging of 16 ADC-samples.
No external noise sources present.

5.1 6 6.9 kHz Mechanical excitation of the
SP40PLUS in this frequency range

12.16

12.17

must be avoided (e.g. PCB sawing
process)

1) Total error specifications are based on averaging 16 raw values for each measurement and they include random error
(noise). The total error may be reduced by 3.5g by periodically (e.g. every 3 months) using the automatic acceleration
offset compensation function Lib_Comp_Auto_Acc_Offset(). The reduced errors are put into brackets.

Data Sheet 9 Revision 1.2
2020-05-14

SP40PLUS

Tire Pressure Monitoring Sensor

Specification

2.3.3 Temperature Sensor

Table 5 Temperature Sensor

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

Measurement range T

Measurement error

1)

Random error T

range

T

Error

random

-40 +125 °C 14.1

-3 +3 °C 14.2

-1 +1 °C 95% of all

14.4

measurements

1) The measurement error is understood as total error, including random error (noise)

2.3.4 Battery Sensor

Table 6 Battery Sensor

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

Measurement range V

Measurement error

1)

V

range

Error

VUVRA 3.6 V see Table 10 for V

-3 – +3 % percentage of

UVRA

15.1

15.2

measurement value

1) The measurement error is understood as total error, including random error (noise)

2.3.5 Thermal Shutdown

Table 7 Thermal Shutdown

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

Thermal Shutdown

T

HOT TH

119 122 125 °C 16.1

HOT threshold

Thermal Shutdown

T

HOT RE

115 120 123.5 °C 16.2

HOT release

Hysteresis T

Thermal Shutdown

HYST

T

COLD TH

1.5 4 °C 16.3

-40 -37 -34 °C 16.4

COLD threshold

Thermal Shutdown

T

COLD RE

-38.5 -35 -30 °C 16.5

COLD release

Data Sheet 10 Revision 1.2
2020-05-14

SP40PLUS

Tire Pressure Monitoring Sensor

Specification

2.3.6 General Purpose Digital I/O Pins

Table 8 Digital I/O Pins - Operating Range

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

Digital Pin Output

I

out DIG

-4 4 mA Pins PP0 to PP3 17.1

Current

Digital Pin Input High
Voltage

Digital Pin Input Low
Voltage

V

IH

V

IL

0.8V

DD

V

- 0.05 V for lowest current

DD

0.2V

50 mV for lowest current

V functional 17.2

consumption

V functional 17.4

DD

1)

17.3

17.5

consumption

1) If the digital I/O pins are left open and the internal pull resistors are activated the +/-50mV criterion is fulfilled

Table 9 Digital I/O Pins - Electrical Characteristics

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

Digital Pin-Output High

V

OH

V

-0.3 V at 1 mA load current 18.1

DD

Voltage

Digital Pin-Output Low

V

OL

0.3 V 18.2

Voltage

Digital Pin Input
Capacitance

C

in

10 pF PP0, PP1 and PP3 18.3

20 pF PP2 18.4

Digital Pin Input current
(PP0, PP1, PP3)

Digital Pin Input current
(PP2)

I

in_PP0_1_3

I

in_PP2

-1 1 µA PP0, PP1, PP3 configured
as input

-1 1 µA PP2 configured as input
T = -40°C...+90°C

-1.5 1.5 µA PP2 configured as input
T = +90°C...+125°C

18.5

18.6

18.7

Data Sheet 11 Revision 1.2
2020-05-14

SP40PLUS

Tire Pressure Monitoring Sensor

Specification

2.3.7 Voltage Monitoring and Power On

Table 10 Voltage Monitoring and Power On

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

Under Voltage Reset
(measured at VDDBAT
pin)

V

UVRA

V

UVRPD

1.6 1.7 V applies in run- and idle-state

and if RF transmission is
ongoing

1)

1.2 1.6 V applies in all other device

19.1

19.2

states

Reset Release
Threshold

2)

V

THR

1.8 1.9 V applies for a reset triggered

by under voltage and power-

19.3

on reset

RF Undervoltage

V

MIN

1.8 1.9 V 19.4

3)

Warning Level

Brown-out Detection
Threshold

1) During TX-interframe in TX-low-power, when the analog circuits are switched off, 19.1 does not apply

2) The device will be released from undervoltage reset or power-on reset only if voltage at VDDBAT pin exceeds V

3) A flag is set if voltage at VDDBAT pin falls below V

4) The brown-out detector monitors the internal 1.5V domain

4)

V

THR_BOD

1.15 1.25 V 19.5

during RF transmission

MIN

2.3.8 Flash memory

THR

Table 11 Flash Memory

1)

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

Flash memory data
retention time

Flash write cycles N

Flash line write time t

t

Ret Flash

write

write_line

10 y Defect rate < 1ppm over

lifetime.

100 20.2

6msIncluding time for

20.1

20.3

verification. I2C Baud-rate =
400 kbit/s

1) Endurance, data retention, and operational life qualified according AEC-Q100-005D1

Data Sheet 12 Revision 1.2
2020-05-14

SP40PLUS

Tire Pressure Monitoring Sensor

Specification

2.3.9 Supply Currents

Table 12 Supply Currents at 3.0V supply voltage

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

Supply current in
power down state

1)

Supply current in idle
state (CPU gated off)

Supply current in run

2)

state

Supply current at
thermal shutdown

3)

LF-receiver supply
current in LF carrier
detection mode
(digital filter off)

4)

LF-receiver supply
current in LF carrier
detection mode
(digital filter on)

4)

I

PWD_3V

I

IDLE_3V

I

RUN_3V

I

TSD_3V

I

LFCD_3V

I

LFCDFilter_3V

245 540 nA +25°C 21.1

8.5 µA +125°C 21.2

0.15 µA -40°C 21.3

280 400 µA +25°C 21.4

400 µA +125°C 21.5

280 µA -40°C 21.6

0.85 1.05 mA +25°C 21.7

0.95 mA +125°C 21.8

0.83 mA -40°C 21.9

85 116 µA +125°C 21.10

62 110 µA -40°C 21.11

3.3 4 µA +25°C 21.12

10 µA +125°C 21.13

3.5 µA -40°C 21.14

4 6 µA +25°C 21.15

11 µA +125°C 21.16

4 µA -40°C 21.17

LF-receiver supply
current in LF data
reception mode

4)

Supply current at RF­transmission

I

LF_3V

I

RFTX_3V

3.85 6 µA +25°C 21.18

11 µA +125°C 21.19

4 µA -40°C 21.20

5.5 7 mA 315MHz, -40...+125°C 21.21

5.7 7 mA 434MHz, -40...+125°C 21.22

CW or FSK
CPU off

Supply current during
RF interframe timing
(CPU off)

Supply current in
deep idle state

5)

I

TXIF_3V

2.1 12 µA +25°C 21.24

34 µA +125°C 21.25

1.8 µA -40°C 21.26

I

DEEP_3V

2.1 12 µA +25°C 21.27

25 100 µA +125°C 21.28

1.7 µA -40°C 21.29

1) PP0, PP1, PP2, PP3 not connected

2) Measured while code is running from flash, executing a mix of read/write operations on retention RAM, SFRs and RAM

3) I

is the always ON current. Average current for clocked operation is I

TSD

4) The LF-receiver supply currents at each temperature are measured by substracting the power down current with LF­Receiver being turned off from the power down current with LF-Receiver being activated in the specific mode.

TSD_avg=IPWD

+(I

TSD-IPWD

)*2.9/16/Interval_Mul_16ms

Data Sheet 13 Revision 1.2
2020-05-14

SP40PLUS

Tire Pressure Monitoring Sensor

Specification

5) Measured with the Data Sheet Reference Board, 50 Ohm RF output terminated with 50Ohm, VDDPA = 2.1V

2.3.10 LF-Receiver

Table 13 LF Receiver Operating Conditions

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

LF Carrier Frequency

LF Data Rate DR

LF Data Duty Cycle DC

LF Data amplitude
change speed

1) LF sensitivity levels are only valid for the specified carrier frequency range.

1)

f

LF

AC

LF

LF

SLF

115 125 135 kHz 22.1

3.8 3.9 4.2 kbit/s 22.2

45 50 55 % 22.3

1.5 Vpp/s Valid for input signals

22.4

up to 10mVpp

Table 14 LF Receiver Characteristics

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

Input differential

C

LF diff

2.5 3.9 10 pF at 125kHz 23.1

capacitance

Input differential
resistance

R

LF diff

1 MOhm at 125kHz, AGC inactive, -

40°C to 90°C

1-(T/°C -90)/70 MOhm at 125kHz, AGC inactive,

23.4

23.5

90°C <=T<= 125°C

LF Receiver settling

t

ON_Set.

3.9 ms After receiver power-on 23.6

time after power on

Table 15 LF Receiver Characteristics (Data Reception Mode)

1)2)

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

LF Data Threshold
settling time

LF Telegram
Detection Sensitivity

t

Settling

S

nodet

S

det

2 ms During LF- telegram

preamble

0.1 mVpp 24.2

1.3 mVpp -20°C to 90°C 24.3

24.1

2.5 mVpp -40°C to 125°C 24.4

1) LF telegram detection sensitivity specified for 100% modulation depth.

2) Specified sensitivities require calling Lib_LF_Sensitivity() in application code, [1].

Data Sheet 14 Revision 1.2
2020-05-14

SP40PLUS

Tire Pressure Monitoring Sensor

Specification

Table 16 LF Receiver Characteristics (Carrier Detection Mode)

1)

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

LF Carrier Detection
Sensitivity

Carrier Detector Filter

2)

Time

1) Specified sensitivities require calling Lib_LF_Sensitivity() in application code, [1].

2) Specified carrier detector filter times require calling Lib_LF_Pulse_Width() in application code, [1].

S

S

t

t

t

CD 1

CD 2

CD 3

nodet

det

0.33 mVpp 25.1

3.35 mVpp 25.2

140 200 240 µs 25.9

350 500 650 µs 25.10

700 1000 1300 µs 25.11

2.3.11 RF-Transmitter

Table 17 RF Transmitter Characteristics

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

Transmit Frequency f

TX

314 316 MHz 28.1

433 435 MHz 28.2

1)

RF Data Rate DR

RF Data Rate
tolerance

2)

RF Output Power

3)

DR

P

RF

RF

RF TOL

-1 1 % 28.4

4 5 6 dBm 2.5V <=VDD<=3.6V

20 kbit/s Manchester Coded 28.3

28.5

+25 to +60 °C

3 7 dBm 1.8V<=VDD < 2.5V

28.6

-40 to 0 °C

3 7 dBm 2.5V <=VDD<=3.6V

28.7

-40 to +25 °C

3 6 dBm 2.5V <=VDD<=3.6V

28.8

+60 to +125 °C

2 6 dBm 1.8V<=VDD < 2.5V

28.9

0 to +125 °C

FSK frequency shift 0 +/-40 +/-75 kHz programmable

28.10

see [2]

RF Data Duty Cycle DC

ASK Modulation depth MD

1) Parameters have been measured with the Data Sheet Reference Board at the 50 Ohm RF output.

2) Specification applies for following data-rates: 4096, 4200, 9600, 10000 and 19200 Baud. For other data-rates the
tolerance may increase to up to +/- 1.5%.

3) Valid for voltage at pin VDDPA = 2.1V

4) FSK duty cycle is characterized by eye-diagram evaluation

5) ASK duty cycle is defined at -3dB of the maximum RF power during ASK on

RF

RF

45 50 55 % valid for FSK4) and ASK5)

90 % 28.12

28.11

Data Sheet 15 Revision 1.2
2020-05-14

SP40PLUS

Tire Pressure Monitoring Sensor

Specification

Table 18 RF Crystal Oscillator

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

Crystal Frequency f

Crystal oscillator drive
current

XTAL

I

Xtal_drive

25.920 26 26.080 MHz 29.1

1.5 mA This parameter reflects

29.2
the driving capability of
the crystal oscillator

Crystal Oscillator
startup time

t

Xtal_start

1msFor crystals

recommended by IFX

29.3

2.3.12 RC Oscillators

Table 19 RC Oscillator Characteristics

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

Temperature drift of

2.2kHz oscillator

Total tolerance of

2.2kHz oscillator

1)

Temperature drift of
90kHz oscillator

TD2k -0.075 +0.075 %/K 30.1

TOL2k

tot

-30 30 % -40 to +125°C and over

30.2
lifetime

TD90k -0.05 +0.05 %/K 30.4

Total tolerance of
90kHz oscillator

2)

Temperature drift of

TOL90k

TD12M -0.05 +0.05 %/K 30.7

-5 5 % -40 to +125°C and over

tot

lifetime

30.5

12MHz oscillator

Total tolerance of

TOL12M

12MHz oscillator

1) The 2.2kHz oscillator is the clock source for the interval timer and the ON-OFF timer. The timers can be calibrated with
firmware functions. The calibration error is reported in the description of the FW function. This error is only valid if
temperature stays constant.

2) The 90kHz oscillator is the clock source for the sampling timer and the interframe timer. The timers can be calibrated
with firmware functions. The calibration error is reported in the description of the FW function. This error is only valid if
temperature stays constant.

-8 8 % -40 to +125°C and over

tot

lifetime

30.8

2.3.13 Wake-up and power-on timing

Data Sheet 16 Revision 1.2
2020-05-14

SP40PLUS

Tire Pressure Monitoring Sensor

Specification

Table 20 Wake-up and power-on timing

Parameter Symbol Values Unit Note or Test Condition Number

Min. Typ. Max.

Power on time t

ini

10.2 ms Time after exceeding V

THR

until

31.1

start of I2C handler

Normal mode delay
time

t

NM_delay

110 µs Time after I2C command for

normal mode sent until

31.2

application code execution start

Resume from deep
idle time

t

resume

750 µs Time from resume event during

deep-idle to application code

31.3

execution start.

Mode selection time t

LF Wake-up time

1)

MS

t

LF wake-up

2.1 2.8 4.2 s see Chapter 4.2.5 31.4

5.3 ms Time from LF wake-up event

31.5
during power-down to
application code execution start.

IT Wake-up time

1)

t

IT wake-up

6 ms Time from interval timer elapsed

31.6
during power-down to
application code execution start.

PP2 Wake-up time

t

PP2 wake-

up

6 ms Time from level-change detected

at PP2 during power-down to

31.7

1)

application code execution start.

1) Note: the device stays in power-down most of the wake-up time and only 550µs(max) in run-state before application
code execution starts

Data Sheet 17 Revision 1.2
2020-05-14

131412

11

10

9

8

213

4

5

6

7

output_en

SP40PLUS

Tire Pressure Monitoring Sensor

Pin Description

3 Pin Description

3.1 Pin Configuration

Figure 1 Pin Configuration

3.2 Pin Description

Table 21 Pin Description

Pin No. Name Pin Type Buffer Type Function

1SCL/PP0Digital I/O General Purpose-I/O I2C Clock

2 SDA/PP1 Digital I/O General Purpose-I/O I2C Data

3 PP2 Digital I/O General Purpose-I/O UART RX data

Data Sheet 18 Revision 1.2
2020-05-14

output_en

SP40PLUS

Tire Pressure Monitoring Sensor

Pin Description

Table 21 Pin Description (cont’d)

Pin No. Name Pin Type Buffer Type Function

4GNDD

5 PP3 Digital I/O General Purpose-I/O UART TX data

1)

Supply Digital Ground

6XINAnalog Crystal oscillator input

7XOUTAnalog Crystal oscillator output

8LFNAnalog LF receiver negative input

9LFPAnalog LF receiver positive input

Data Sheet 19 Revision 1.2
2020-05-14

SP40PLUS

Tire Pressure Monitoring Sensor

Pin Description

Table 21 Pin Description (cont’d)

Pin No. Name Pin Type Buffer Type Function

10 VDDREG Supply Regulated voltage output (1.5V)

2)

11 GNDA

1)

Supply Analog Ground

12 PAOUT Analog

output

13 VDDPA Analog

output

RF power amplifier output

Regulated voltage for PA

14 VDDBAT Supply Power supply

1) GNDD and GNDA are shorted internally via leadframe

2) Note: this pin is only intended for stabilization of the internal voltage of the SP40PLUS by an external capacitor. It
must not be used as external current source.

Data Sheet 20 Revision 1.2
2020-05-14

SP40PLUS

Tire Pressure Monitoring Sensor

Special Features of the SP40PLUS

4 Special Features of the SP40PLUS

4.1 Operating Modes

Apart from normal operating mode the SP40PLUS 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 (6C
followed by a code for the operating mode to be selected. If the SP40PLUS does not receive any I2C command
after POR or a wrong command it starts up in normal operating mode (“Normal mode”).

Table 22 Operating Modes Overview

H

)

Operating mode Device

controlled by

Normal mode application

Short Description I2C

command

Normal operating mode for TPMS application 9876

1)

H

code

Program mode external I2C-

Master

Used for programming application code and user
configuration data. Additional I2C commands allow reading

1F5A

H

sensor measurement values.

Debug mode external I2C-

Master

Used for application code development. Commands for
RAM read/write, program counter manipulation, execute

FEDC

H

single step and run until breakpoint/interrupt are available.

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

4.2 Device states

In normal operation mode the SP40PLUS 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 23 Device states overview

Device state Short description Important activated blocks

Run state application code execution.

Idle state

1)

No code execution. Device is
waiting for a wake-up/resume
event. Fast recovery on wake­up/resume event.

• CPU with 12 MHz RC-oscillator

• All other blocks can be activated if needed

• 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 state

2)

No code execution. Device is
waiting for a resume event from
sampling timer or wake-up

• Wake-up controller with 2.2kHz RC-oscillator

• 90 kHz oscillator

•System controller

event. Intended for equidistant
acceleration raw measurements.

Data Sheet 21 Revision 1.2
2020-05-14

• Optional: LF-receiver

Run state

Power down

state

Deep idle

state

Thermal

shutdown

Idle state

TX low power

state

I2C

Handler

Valid I2C

comman

d or time-

out

Resume

Enter

idle

System

Reset

Enter

power-

down

Wake-

up

Resume

Enter

deep

idle

Enter

TX low

power

Enter

power

down

Resume

Wakeup/

Resume boot

sequence

Resume

Enter

thermal

SD

SequenceDevic e state

Reset boot

sequence

SP40PLUS

Tire Pressure Monitoring Sensor

Special Features of the SP40PLUS

Table 23 Device states overview (cont’d)

Device state Short description Important activated blocks

Power-down state No code execution. Device is

waiting for a wake-up event.
Lowest current consumption.

TX low power state Power-down state where TX

state-machine can be operated.
Device wakes-up/resumes on
interval-timer elapsed or
transmission end. Other events
are postponed.

Thermal shutdown

3)

state

Almost all circuits shut off.
Resume only if temperature
returns to normal operating
range.

1) In idle state the CPU is halted. When device resumes from idle code execution immediately continues behind the point
of entering idle state.

2) In deep idle the CPU is shut off. When device resumes from deep idle code execution restarts from reset vector.

3) In thermal shutdown the CPU is shut off. When device resumes from thermal shutdown code execution restarts from
reset vector.

• Wake-up controller with 2.2kHz RC-oscillator

• Optional: LF-receiver with 90 kHz oscillator

• Wake-up Controller with 2.2kHz RC-oscillator

• Optional: LF Receiver with 90 kHz oscillator

• 90kHz oscillator

•TX state machine

• RF-transmitter when needed by TX state machine

• Temperature detector

• Wake-up Controller with 2.2kHz RC-oscillator

4.3 State Transitions

Figure 2 shows the possible state transitions in normal mode. The central device state is run state because only

in run state the state transitions can be configured. Entering other states from run state is controlled by
application code, either by calling firmware functions [1] or setting control bits [2]. State transitions from other
states are controlled by hardware events, e.g. timer events or LF receiver events.

Figure 2 State transitions in normal mode

Data Sheet 22 Revision 1.2
2020-05-14