STM8T141-EVAL evaluation kit

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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.
October 2010
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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www.st.com
Contents
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Contents
1
Description of the STM8T141-EVAL kit . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1
1.2
2
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
STM8T141 plug-in modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
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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List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
STM8T141 main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
STM8T141 configuration color coding and marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Option bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
STM8T141 module pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Copper plane configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
STM8T141 board in standalone mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
STM8T141 board powered through USB supply with earth connection . . . . . . . . . . . . . . . 15
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
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List of figures
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List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
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STM8T141-EVAL evaluation kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
MB858 evaluation board with STM8T141 module plugged-in . . . . . . . . . . . . . . . . . . . . . . . 6
MB858 evaluation board top layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
MB858 evaluation board bottom layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
MB858 evaluation board top copper plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
MB858 evaluation board bottom copper plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
STM8T141 module assembly drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
On-board sensing electrode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
On-board sensing electrode configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
On-board sensing electrode with external antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
STM8T141 programming tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
STM8T141 blank module box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
STM8T141 evaluation board (MB858) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
STM8T141 module (MB856) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
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1
Description of the STM8T141-EVAL kit
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
1.1
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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
MB858 evaluation board
STM8T141 module
Pin 1
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
GND Grab pin
Power supply switch
Current measurement
connector
DIP14 module
footprint
Sensing electrode
Antenna connector
Sensing electrode hatched copper
plane shield/grounding selection
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Description of the STM8T141-EVAL kit
Figure 4.
MB858 evaluation board bottom layout
Battery socket
USB power
connector
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.
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Description of the STM8T141-EVAL kit
1.1.5
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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
Top copper
plane (CP1)
Figure 6.
MB858 evaluation board bottom copper plane
Bottom
copper plane (CP2)
Hatched
copper plane
(HCP)
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1.2
Description of the STM8T141-EVAL kit
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 Table 2 and Figure 7). Refer to Table 4 for the
description of STM8T141 module pins.
Table 2.
STM8T141 configuration color coding and marking
PCB color
Module configuration
PCB marking
LED color
Proximity detection
No marking
Blue
Sensitive Touch detection
White dot ink marking
Red
Green
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
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125 kHz
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Description of the STM8T141-EVAL kit
Table 4.
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STM8T141 module pin description
Pin number
Pin name
1
SHOUT
2
ELEC
3
NC
4
TOUT/POUT
5
NC
Not connected
6
CS
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
14
NC
Figure 7.
Description
Shield output
Electrode
Not connected
Touch/Proximity output
Internal voltage regulator output
Not connected
STM8T141 module assembly drawing
Pin 1
Touch/Proximity
output LED
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2
Getting started with the MB858 evaluation board
Getting started with the MB858 evaluation board
To run the board:
1.
Place the board on a plane surface.
2.
Plug a module in the board according to the device and configuration you intend to
evaluate. Make sure that the module is correctly plugged into the socket.
3.
Switch on the board.
4.
Move your finger or hand close to the touch/proximity electrode:
–
The blue LED switches on to indicate a proximity detection.
–
The red LED switches on to indicate a touch detection.
Note:
To improve sensitivity, connect the MB858 board to your PC through a USB cable. The
board is then ground and powered through the USB interface.
2.1
Using the on-board sensing electrode
A 1.5 mm acrylic panel mounted on the MB858 is used as sensing electrode. To
demonstrate the detection through various dielectric thicknesses, an additional 3 mm panel,
included in the STM8T141-EVAL kit, can be stacked on as shown on Figure 8.
To use the on-board sensing electrode, a jumper must be installed on the JP1 connector as
shown on Figure 9.
Figure 8.
On-board sensing electrode
Touch configuration
Proximity configuration
3 mm panel
1.5 mm panel
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Getting started with the MB858 evaluation board
Figure 9.
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On-board sensing electrode configuration
4x
ai15076
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2.2
Getting started with the MB858 evaluation board
Installing an external shielded antenna
The on-board sensing electrode can be replaced by an external antenna. The user can use
either the antenna provided with the kit, or any other sensing electrode.
To install an external antenna, remove the jumper on JP1, and plug in the antenna.
Figure 10. On-board sensing electrode with external antenna
Caution:
Grabbing the external shield antenna might result in incorrect system behavior.
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Getting started with the MB858 evaluation board
2.3
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Shielding and grounding configuration
The MB858 evaluation board features 3 different independent copper planes (refer to
Section 1.1.5). According to the environment and the application, the overall system
performance and stability can be improved by connecting copper planes to ground or to the
board shield (see Figure 5.).
CP1 and CP2 copper planes can be configured through R1 and R2 resistors, while HCP is
configured through JP3 jumper. The board is delivered with R1 and R2 connected to
ground, and JP3 to the shield.
Table 5 shows how to configure the board jumpers for each copper plane.
Table 5.
Copper plane configuration
Copper plane
Description
Shield connection
CP1
Ground connection
Shield connection
CP2
Ground connection
Shield connection
HCP
Ground connection
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3
Performance
Performance
The touch and proximity sensing technology is highly dependent on the environment. The
application behavior consequently varies when it is moved from a wooden to a metallic
table. In addition, if the application is moved quickly from one place to another, the board
may detect the environment change and consider it as a touch or proximity detection.
To avoid such behavior, turn off the board when you move it. This will force a recalibration.
Table 6 and Table 7 show the MB858 evaluation board performance in typical operating
conditions.
Table 6.
STM8T141 board in standalone mode
Device
Configuration
Description
Performance
–
–
–
–
Sensitive touch
Low power mode with zoom
Battery supply
JP3 connected to shield (SHLD)
Touch configuration using onboard electrode
Touch detection over 7.5 mm
acrylic panel
–
–
–
–
Proximity
Low power mode with zoom
Battery supply
JP3 connected to shield (SHLD)
Proximity configuration using
on-board electrode
Proximity detection in the
range of 3 cm
STM8T141
Table 7.
STM8T141 board powered through USB supply with earth connection
Device
STM8T141
Configuration
–
–
–
–
Description
Proximity
Low power mode with zoom
USB supply
JP3 connected to shield (SHLD)
– Proximity
– Low power mode with zoom
– USB supply
Performance
Proximity/touch configuration
using on-board electrode
Proximity detection in the
range of 5 cm
Proximity/touch configuration
using external antenna
Proximity detection in the
range of 12 cm
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Troubleshooting
4
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Troubleshooting
Table 8 provides the answers to the most common questions related to unexpected behavior
or unspecified operating conditions.
Table 8.
Troubleshooting
Problem
Probable cause
Remedy
No system protection preventing the
Use a casing to protect the PCB
user from touching the PCB.
The LED is switched on when
holding or touching the board
Poor system grounding
In proximity detection, the LED
is switched on when moving the Wrong shielding configuration
hand close to some PCB areas
The LED is switched on when
moving the board
The LED is permanently
switched on after a detection
occurs in proximity
configuration
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Connect board ground to earth by
connecting the USB cable to a HUB
supplied with an earth outlet.
Use the shield output to protect the
corresponding area from detection. A
typical case is electrode back side
detection: to cancel the detection,
configure the electrode back side copper
plane to shield by connecting JP3 to
SHLD.
The surrounding environment
changes very quickly when moving
the board. As a consequence, the
earth reference changes. This can
be interpreted as a detection.
Connect the ground of the board to earth
by connecting the USB cable to a HUB
supplied with an earth outlet.
If the battery charge or quality is not
adequate, the application supply
may decrease upon a detection due
to the current sunk into the LED
when it is switched on. This
changes the detection threshold
and may lock the device on.
– Replace the battery with a new, fully
charged one.
– Use a higher grade battery with better
current stability.
– Use the USB power supply with the
battery removed.
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5
Programming tools
Programming tools
The capacitive sensing devices can be configured through option bytes. Refer to the
STM8T141 datasheet for a detailed description of the option bytes.
The STM8T141 modules can be programmed using the ST-TSLINK programming dongle
and STVP (Visual Programmer) and the STM8T14X-SB socket board (see Figure 11 and
refer to the STM8T14X-SB data brief). For more information on the STM8T141-EVAL
programming tools, visit STMicroelectronics microcontroller support site at
http://www.st.com/mcu.
Figure 11. STM8T141 programming tool
ST-TSLINK
STM8T14X-SB socket board
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Ordering information
6
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Ordering information
Table 9 gives the list of the order codes.
Table 9.
Order codes(1)
Part number
Order codes
STM8T141-EVAL
STM8T141-EVAL
STM8T-MOD
Description
STM8T141 evaluation kit (described in this user manual)
Box containing 10 MB856 blank modules based on
STM8T141AM-MOD STM8T141AM61T (OTP device in SO8 package)
(see Figure 12)(2)
ST-TSLINK
ST-TSLINK
STM8T14X-SB
STM8T14X-SB
Programming dongle for STM8T141 devices and
STM8T14X-SB socket boards.
Socket board for STM8T141 devices.
1. The ST-TSLINK dongle and the STM8T14X-SB socket board are not part of the STM8T141-EVAL
evaluation kit, and must consequently be ordered separately.
2. In addition to the STM8T141-EVAL evaluation kit, additional STM8T141 “blank” modules (STM8T141AMMOD) can be ordered separately, with the device option bytes left unprogrammed.
Figure 12. STM8T141 blank module box
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7
Schematics
Schematics
This section shows the design schematics for the STM8T141-EVAL kit:
●
MB858 evaluation board (see Figure 13)
●
STM8T141 module (see Figure 14)
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D
C
B
SHLD-OUT
R1
0R_0603
1
copper plane 1
3
1
2
3
4
0
USBMINI-B-SMT
VCC
DD+
GND
SHIELD
CN1
2
GND
1
GND
2
1
R2
DNF
0R_0603
copper plane 2
3
TestPin GND
TP1
2xCR2016 (3V165mA)
CN2
SHLD-OUT
GND
BAV70
3
BT1
Battery 20mm
1
2
D1
JP2 IDD
2
A
3
2
1
GND
1
GND
VDD
2
3
2
GND
CS
PROX-OUT
SHLD-OUT
ELECTRODE
ON/OFF
1 S1
JP3
1
2
3
4
5
6
7
GND
1
2
hatched
SHLD-OUT
JUMPER 3 POS
STM8T141
SHLD-OUT
VDD
ELECTRODE
VREG
NC
NC
PROX-OUT SHLD-OUT
NC
NC
CS
CX
VSS
NC
U1
2
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14
13
12
11
10
9
8
CX
JP1
MB858
Revision:
STMicroelectronics
190, avenue Célestin COQ
13106 ROUSSET Cedex
FRANCE
QTOUCH ELECTRODE
K1
C-00
1
4
D
C
B
A
3
4
£
Date: 28/Jul/09
Sheet 1 of 1
File: R:\Mcd\GUILHOT\Altium\MB858c - STM8T14x Evaluation Board\MB858c - STM8T14x Evaluation Board Altium databa
Number:
A4
Size:
2
STM8T14x Evaluation Board
ELECTRODE
JUMPER 3 POS
3
Title
SHLD-OUT
VDD VREG
3
1
1
Schematics
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Figure 13. STM8T141 evaluation board (MB858)
R3
R2
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4
VREG
SH OUT
VDD
T/POUT
STM8T141
SH IN
CX
CS
VSS
U1
C4
47nF_COG_1206
GND GND
0R_0603
2K_1%_0603
3
2
1
5
6
7
8
1µF_X5R_0603
C3
VCC
C2
1µF_X5R_0603
LED CMS 0603
LD1
2K_1%_0603
R4
100K_1%_0603
R1
100nF_X7R_0603
GND
C1
7
6
4
2
1
GND
14
CX 9
VREG 13
STM8T14X Module
VSS
CS
TOUT
ELEC
SH OUT VDD
VCC
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Schematics
Figure 14. STM8T141 module (MB856)
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Reference documents
8
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Reference documents
●
STM8T141 datasheet
●
STM8T14X-SB data brief
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9
Revision history
Revision history
Table 10.
Document revision history
Date
Revision
Changes
10-Sep-2009
1
Initial release
20-Nov-2009
2
Minor modification to Section 1.2.
08-Feb-2010
3
Table 8: updated with an additional problem, cause and remedy.
15-Oct-2010
4
Changed STM8T14X-EVAL to STM8T141-EVAL.
Modified VDD voltage range in Table 1.
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