ST STM8T141-EVAL Manuale utente

October 2010 Doc ID 15952 Rev 4 1/24

UM0742

User manual

STM8T141-EVAL evaluation kit

Introduction

The STM8T141-EVAL is an evaluation kit which introduces developers to

STMicroelectronics STM8T141 touch and proximity capacitive sensor.

It contains an STM8T141 evaluation board, the MB858, plus a set of preconfigured plug-in

modules which can evaluate STM8T141 device performances in either touch or proximity

detection (depending on the module which has been plugged in).

The evaluation kit features are the following:

■Touch detection with on-board PCB sensing electrode and 1.5 mm dielectric panel

■Easy dielectric adjustment by stacking acrylic panels

■Proximity detection with on-board PCB sensing electrode or plug-in antenna

■Standalone power configuration using an on-board battery

■External power supply through USB interface

■Electrode grounding or shielding configured by jumper

Table 1. STM8T141 main features

Features STM8T141

Sensing channel 1

Proximity detection range A few cm

Outputs 1 (Touch or Proximity)

Sampling capacitor External

Active shield Yes

VDD 2.0 to 5.5 V

IDD in Normal power mode (typ) 30 µA

IDD in Low power mode 11 µA

Packages SO8 narrow or UFDFPN8 (2 x 3 mm)

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Contents UM0742

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Contents

1 Description of the STM8T141-EVAL kit . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 MB858 evaluation board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.1.1 Module socket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.1.2 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.1.3 On-board sensing electrode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.1.4 Antenna connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.1.5 Copper planes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.2 STM8T141 plug-in modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2 Getting started with the MB858 evaluation board . . . . . . . . . . . . . . . . 11

2.1 Using the on-board sensing electrode . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.2 Installing an external shielded antenna . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.3 Shielding and grounding configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5 Programming tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

8 Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

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UM0742 List of tables

Doc ID 15952 Rev 4 3/24

List of tables

Table 1. STM8T141 main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Table 2. STM8T141 configuration color coding and marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Table 3. Option bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Table 4. STM8T141 module pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 5. Copper plane configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Table 6. STM8T141 board in standalone mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 7. STM8T141 board powered through USB supply with earth connection . . . . . . . . . . . . . . . 15

Table 8. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 9. Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Table 10. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

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List of figures UM0742

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List of figures

Figure 1. STM8T141-EVAL evaluation kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2. MB858 evaluation board with STM8T141 module plugged-in . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3. MB858 evaluation board top layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 4. MB858 evaluation board bottom layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 5. MB858 evaluation board top copper plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 6. MB858 evaluation board bottom copper plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 7. STM8T141 module assembly drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 8. On-board sensing electrode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 9. On-board sensing electrode configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 10. On-board sensing electrode with external antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 11. STM8T141 programming tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 12. STM8T141 blank module box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 13. STM8T141 evaluation board (MB858) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 14. STM8T141 module (MB856) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

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UM0742 Description of the STM8T141-EVAL kit

Doc ID 15952 Rev 4 5/24

1 Description of the STM8T141-EVAL kit

The STM8T141-EVAL kit (see Figure 1) includes:

●1 STM8T141 evaluation board (MB858)

●4 STM8T141 preconfigured plug-in modules (MB856)

●1 antenna shielding cable

●1 additional 3 mm acrylic panel

Figure 1. STM8T141-EVAL evaluation kit

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Description of the STM8T141-EVAL kit UM0742

6/24 Doc ID 15952 Rev 4

1.1 MB858 evaluation board

Figure 2 shows the MB858 evaluation board, while Figure 3 and Figure 4 show the board

top and bottom layout.

Figure 2. MB858 evaluation board with STM8T141 module plugged-in

1. This photo is not contractual.

2. Pin 1 identifies the first pin of the module (refer to Table 4).

Figure 3. MB858 evaluation board top layout

Pin 1

STM8T141 module

MB858 evaluation board

Sensing electrode

DIP14 module

footprint

Antenna connector

Sensing electrode hatched copper

plane shield/grounding selection

Power supply switch

Current measurement

connector

GND Grab pin

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UM0742 Description of the STM8T141-EVAL kit

Doc ID 15952 Rev 4 7/24

Figure 4. MB858 evaluation board bottom layout

1.1.1 Module socket

The MB858 evaluation board features an SDIP14 socket to connect the STM8T141 module

(see Figure 3).

1.1.2 Power supply

The evaluation board can be powered by two different sources:

●A 6 V DC battery supply unit composed of two 3 V CR2016 batteries.

●A 5 V DC power supply delivered by the J1 USB connector (cable not provided) (see

Figure 4).

A dual-anode protection diode (D1) prevents power supply current injection.

IDD current can be monitored by connecting an ammeter to JP2 connector (see Figure 3).

Caution: Switch S1 power switch off to preserve batteries when the evaluation board is stored with a

module plugged into it.

1.1.3 On-board sensing electrode

A copper sensing plate deposited on the PCB is used as a sensing electrode for touch and

proximity detection (refer to Figure 3).

1.1.4 Antenna connector

JP1 connector allows to connect an external antenna instead of the on-board sensing

electrode.

USB power

connector

Battery socket

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Description of the STM8T141-EVAL kit UM0742

8/24 Doc ID 15952 Rev 4

1.1.5 Copper planes

Two copper planes (CP1, CP2) and one hatched copper plane (HCP) were laid out onto the

PCB (see Figure 5).

Figure 5. MB858 evaluation board top copper plane

Figure 6. MB858 evaluation board bottom copper plane

Top copper

plane (CP1)

Bottom

Hatched

copper plane (CP2)

copper plane

(HCP)

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UM0742 Description of the STM8T141-EVAL kit

Doc ID 15952 Rev 4 9/24

1.2 STM8T141 plug-in modules

The STM8T141-EVAL includes a set of plug-in modules (see Section 1.1). They allow a

quick and simple evaluation of the STM8T141 main features and performances for different

option byte configurations:

●3 modules configured in proximity mode / no marking

●1 module configured in sensitive touch mode / white marking

The modules incorporate one LED. To allow quick identification of the module configuration

(touch or proximity) when the demonstration is running, the following color codes are used:

●Blue LED corresponds to the proximity configuration

●Red LED corresponds to the touch configuration

Refer to Section 5 for information on programming tools.

The STM8T141 plug-in module PCB is green.

The STM8T141 touch/proximity output (TOUT/POUT) is connected to an LED which is

turned on when a touch or proximity detection occurs. The LED color depends on the

STM8T141 module configuration (refer to Ta bl e 2 and Figure 7). Refer to Ta ble 4 for the

description of STM8T141 module pins.

Table 2. STM8T141 configuration color coding and marking

PCB color Module configuration PCB marking LED color

Green Proximity detection No marking Blue

Sensitive Touch detection White dot ink marking Red

Table 3. Option bytes

Mode Sensitive touch description Standard proximity description

Power mode Low power mode with zoom Low power mode with zoom

Sensitivity threshold Sensitive touch Standard proximity

Recalibration timeout 15 seconds 15 seconds

TOUT/POUT output mode Active Active

Sampling conversion

period 20 ms 20 ms

Charge transfer frequency 125 kHz 125 kHz

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Description of the STM8T141-EVAL kit UM0742

10/24 Doc ID 15952 Rev 4

Figure 7. STM8T141 module assembly drawing

Table 4. STM8T141 module pin description

Pin number Pin name Description

1 SHOUT Shield output

2ELECElectrode

3 NC Not connected

4 TOUT/POUT Touch/Proximity output

5 NC Not connected

6CS

Capacitive sensing channel pin to external sampling

capacitance CS

7 VSS Ground

8 NC Not connected

9 CX Capacitive sensing channel pin to RX (CX serial resistor)

10 NC Not connected

11 NC Not connected

12 NC Not connected

13 VREG Internal voltage regulator output

14 NC Not connected

Touch/Proximity

output LED

Pin 1

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