STP08DP05, STP16DP05 Normal mode and error detection features

August 2007 Rev 3 1/21

AN2478Application note

STP08DP05, STP16DP05Normal mode and error detection features

IntroductionIn applications such as electronic advertising or traffic signs that use an IC to drive a matrix of LEDs, it is very important to verify the correct functionality of each output. STMicroelectronics has introduced the STP08DP05 and STP16DP05 featuring output error detection. This application note shows how to utilize the devices under normal mode operative conditions and how to perform error detection.

www.st.com

http://www.st.com

Contents AN2478

2/21

Contents

1 Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2 Normal mode functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3 Error detection features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4 Error detection output test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.1 Proper supply LED voltage for correct error detection . . . . . . . . . . . . . . . 11

5 Evaluation boards with error detection features using STP08DP05 LED drivers 13

5.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.2 Timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.3 STP08DP05 vs. STP08CDC596 detection diagram . . . . . . . . . . . . . . . . 15

5.4 Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.5 Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

6 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

AN2478 List of figures

3/21

List of figures

Figure 1. Typical application of STP08DP05 and/or STP16DP05 devices . . . . . . . . . . . . . . . . . . . . . 4Figure 2. Typical functionality in normal mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Figure 3. Typical functionality without OE/DM2 signal and the output switching ON according to LE/DM1 signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Figure 4. Error detection sequence for STP08DP05 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Figure 5. Error detection sequence for STP16DP05 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Figure 6. STP08DP05 typical error detection results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Figure 7. Entering output error detection timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Figure 8. Resuming normal mode timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Figure 9. Error detection sequence problem due to LE/DM1 synchronization. . . . . . . . . . . . . . . . . . 10Figure 10. Error detection sequence problem due to OE/DM2 synchronization . . . . . . . . . . . . . . . . . 11Figure 11. Detection circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Figure 12. STEVAL-ILL002V3 or 4 evaluation boards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Figure 13. Timing diagram for the STEVAL-ILL002V3 or 4 evaluation board . . . . . . . . . . . . . . . . . . . 14Figure 14. Detection diagram for STEVAL-ILL002V3 or 4 evaluation board . . . . . . . . . . . . . . . . . . . . 15Figure 15. Detection diagram for STP08DP05 and STP08CDC596 LED drivers . . . . . . . . . . . . . . . . 16Figure 16. Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Device description AN2478

4/21

1 Device description

The STP08DP05 and STP16DP05 are monolithic, low voltage shift registers. The device contains either an 8-bit (STP08DP05) or a 16-bit (STP16DP05) serial-in, parallel-out shift register that feeds an 8-bit or 16-bit D-type storage register. Eight or sixteen regulated currents are present in the output stage that provide 5-80 mA constant current to drive the LEDs. The secondary device functionality (error detection) provides a status check of the LEDs to detect any possible error during driving.

Figure 1. Typical application of STP08DP05 and/or STP16DP05 devices

AN2478 Normal mode functionality

5/21

2 Normal mode functionality

During normal mode status, the serial data present on the SDI pin is transferred to the shift register during the CLK rise time signal transition. After 8 CLK pulses for the STP08DP05, or 16 CLK pulses for the STP16DP05, the data loaded on the SDI pin will be shifted to the SDO pin with a typical delay of 15 ns (depending on the clock). This delay guarantees the correct synchronization of the CLK and SDI signals if two or more devices are cascaded. The data present in any register can be transferred to the respective latch when the Latch - Enable (LE/DM1) is "high" (serial to parallel conversion). After this step, data is transferred to the outputs by the output enable (OE/DM2) which turns ON the LEDs at the current set by the external resistor. It is also possible to use the OE/DM2 pin to modify the output ON/OFF duty cycle. This allows an optimization of dimming when two or more devices are used.

Figure 2. Typical functionality in normal mode

The signals shown on the plot are:

● CLK signal (CH1)

● OE/DM2 signal (CH2)

● Vout level (CH3)

● OutputN (CH4) which turn ON and OFF according to the OE pulse

Under specific applicative conditions, where it is necessary to transfer data directly to the outputs without the OE/DM2 signal (always "low"), the LE/DM1 is synchronized with a CLK signal that transfers the shift register data to the specific output as reported in the following plots.

Normal mode functionality AN2478

6/21

Figure 3. Typical functionality without OE/DM2 signal and the output switching ON according to LE/DM1 signal

AN2478 Error detection features

7/21

3 Error detection features

This feature allows the output status detection to verify the functionality of the LEDs. The error detection includes both open circuit detection and short circuit detection. From "normal mode", the device is switched to "error mode" by a logic sequence on the OE/DM2 and LE/DM1 pins. The eight data bits (STP08DP05) must be set to "1" in order to set all the outputs ON during detection. The data are latched by LE/DM1. After latching, the outputs are ready for the detection process. When the microcontroller switches the OE/DM2 to "low", the device drives the LEDs in order to analyze if an open or short condition has occurred.

In order to set the SDO output pin to the correct output error detection value, during the acquisition time (OE/DM2 "low"), at least two CLK pulses must be applied before the rising edge of OE/DM2 signal. These CLK pulses must be sent after the minimum detection time (typically 500-600 ns). In this way the data loaded into the shift register will be updated (rewritten) with the error detection data when the OE/DM2 signal turns to “high”. Good output results are shown with a "1" logic level, and with a "0" logic level when the output is malfunctioning (short or open condition).

The plots below show all the steps required to perform the error detection for the STP08DP05 and the STP16DP05.

Figure 4. Error detection sequence for STP08DP05

LE and OE

signal for Error

Detection Mode

Feeding 8 bit of CLK signal after entering

the EDM, the SDI signal, set to 1, is

loaded inside the shift register

This signal latches the

Data vs the SDO

Set the Enable “ON”, run 2

CLK cycle minimum, wait

1micro second minimum,

then apply other 1 CLK

cycle

Detection Results shown by SDO.

In this case all the outputs are

Open

After the Detection

Error Windows, an

OE Signal puts the

device in Normal

Mode

Error detection features AN2478

8/21

Figure 5. Error detection sequence for STP16DP05

After OE/DM2 turns to "high", the results of the outputs are synchronized with the CLK signal rise time as shown in Table 1:

The same table can also be used for the STP16DP05, but in this case, 16 CLK pulses are necessary and the results are shown following output 15, output 14, etc.

Table 1. STP08DP05 output error detection sequence after OE acquisition

CLK Pulse after OE turn to "high" level Output results

1° CLK Rise edge Output7








LE and OE Key

Sequence necessary

to Enter in EDM

16 CLK pulses are

required to load the

data setting 1 into

shift register

The LE pulse latches

the data loaded during

the previous state

Set the Enable "ON", run 2

CLK cycle minimum, wait

1micro second minimum,

then apply other 1 CLK cycle

Each CLK pulse shows the

results of single Output

results:Out15;14; 13 etc.

After OE signal turns High,

the SDO pin shows the

results of Error Detection

(Open or Short in this case)

The OE Pulse switches the

device from EDM to Normal

Mode

AN2478 Error detection features

9/21

Figure 6. STP08DP05 typical error detection results

After detection, apply an OE signal to return to normal mode. The following two figures show the pattern necessary to enter error detection mode and return to normal mode.

Figure 7. Entering output error detection timing

Figure 8. Resuming normal mode timing

The Output results are

shown at first CLK pulse

after OE signal turns High

OUT7 OUT0OUT6

Error detection output test circuit AN2478

10/21

4 Error detection output test circuit

During the error detection time, the internal structure of the device allows only an output current test. This is done by comparing the current flowing from the output and the current set by the programming resistor "REXT".

If the read current is typically less than 50% of the current set by "REXT", the device marks the output as malfunctioning, and converts the previous data loaded into the shift register from 1 to 0. These results are then transferred by the SDO pin. Table 2 shows an example of the measured error detection threshold for several output current levels, as set by "REXT".

To correctly run the output error detection, all signals must be synchronized with the falling edge of the CLK signal. This is necessary to avoid any setup/hold time problems. If this rule cannot be applied due to specific application conditions (data generated by a microcontroller, for example), it is possible to start the OE signal typically at 20 ns of delay after the rise time of the CLK signal. The next two plots show a typical error detection mode problem due to wrong error key (LE/DM1 or OE/DM2).

Figure 9. Error detection sequence problem due to LE/DM1 synchronization

Table 2. Error threshold test results

Vdd (V) Iset (mA) Measured error threshold

5 2.27

10 5.32

3.3 20 8.38

50 17.91

80 29.06

5 1.88

10 4.81

5 20 6.44

50 18.54

80 31.36

Error

Detection

Problem

due to OE

signal

No

detection

was

Observed

AN2478 Error detection output test circuit

11/21

Figure 10. Error detection sequence problem due to OE/DM2 synchronization

Only one error detection reading can be taken within the acquisition time window. If two or more readings are required, the complete error detection sequence has to be repeated.

4.1 Proper supply LED voltage for correct error detection For proper error detection it is necessary to set correct supply voltage for the LEDs, otherwise a wrong LED status can be obtained from the LED drivers. During error detection all outputs should be turned ON at least for 1 µs (LED current is set by external resistor) and the output current and output voltage on the driver is measured in order to detect an open load or short circuit (Figure 11). There are two detection conditions for which the supply LED voltage must be kept in proper range:

1. First detection condition:

If detected current is lower than 50% of current set by the external resistor, it is evaluated as an open load or output short to ground. False error detection can occur if the LED supply voltage is too low, because in this case the detected current is under the defined limit. Minimum voltage for proper error detection can be calculated with the following equation:

Equation 1

Vc: LED supply voltage [V]

VLED_MAX: maximum LED forward voltage [V]

Vout: output voltage for current set by external resistor [V]

2. Second detection condition:

If detected voltage is higher than 2.5 V, it is evaluated as a short on LED or short to Vc. Incorrect error detection can occur if the LED supply voltage is too high, because in this case the detected voltage is above the defined limit. Maximum voltage for proper error detection is calculated with the following equation:

Equation 2

Error

Detection

Problem

due to LE

signal

No

detection

was

Observed

IOutDetect 0.5 Iout•≤

VC VLEDMAX Vout+≥

Vout 2.5 V≥

VC 2.5 VLEDMIN+≤

Error detection output test circuit AN2478

12/21

VLED_MIN: minimum LED forward voltage [V]

For example the STEVAL-ILL002V3 uses the OSRAM LED - LB T68C with the current set to 20 mA. The supply voltage for these LEDs was adjusted to 4.49 V, because the LED voltage range for proper error detection is between 4.3 V and 5.5 V.

Equation 3

Equation 4

where VLED_MAX = 4.1 V and VLED_MIN = 3 V.

Vout = 200 mV - voltage drop on the driver for 20 mA LED current (see datasheet STP16DP05 - same voltage drop as for STP08DP05).

Figure 11. Detection circuit

Vc VLEDMAX Vout 4.1 0.2 4.3 V=+=+≥

Vc 2.5 V+ LEDMIN 2.5 3 5.5 V=+=≤

STP08DP05

Co

ntr

ol

an

d l

og

ic p

art

LED supply

voltage

VLED

Vout

Vc

Iout

AN2478 Evaluation boards with error detection features using STP08DP05 LED drivers

13/21

5 Evaluation boards with error detection features using STP08DP05 LED drivers

5.1 DescriptionThe main aim of this section is to demonstrate two evaluation boards with error detection features using the new STP08DP05 LED drivers: the STEVAL-ILL002V3 with OSRAM LEDs and the STEVAL-ILL002V4 with VISHAY LEDs (Figure 12). The evaluation boards are completely based on an existing solution already described in AN2415, because drivers were replaced by the new STP08DP05. Therefore this section is focused on explaining only the differences in the main features and timing diagram.

Main features of the evaluation board are:

● Brightness regulation

● Blinking speed regulation

● Animated text

● Error detection on outputs

● PC graphic user interface for error detection(GUI)

● DC/DC converter using the L5970D

● Input voltage range of 7 V to 32 V

Two versions of the evaluation boards are available:

● STEVAL-ILL002V3 using OSRAM LEDs

● STEVAL-ILL002V4 using VISHAY LEDs

Figure 12. STEVAL-ILL002V3 or 4 evaluation boards

5.2 Timing diagramThe heart of this application is the microcontroller (ST7LITE39) which sends the data through the SPI to the LED drivers. There are five STP08DP05 LED drivers each with eight outputs assembled to allow independent driving of 40 LEDs during normal operational mode and also to detect the status of incorrect LEDs during error detection mode. The implementation method is described in the timing diagrams in this document.

Evaluation boards with error detection features using STP08DP05 LED drivers AN2478

14/21

The timing diagram for normal operational mode is shown in Figure 13 (left side). The yellow waveform is the clock frequency of the SPI set to 2 MHz. Five bytes are sent to the drivers in order to independently control 40 LEDs . When all data are shifted to the drivers (registers) the latch (red waveform) is switched to high and rewrites the storage registers. The OE pin enables the output driver sink current. Current is modulated by the potentiometer which changes the PWM duty cycle on the OE pin (PWM frequency is set at 244 Hz).

More information about timing diagram in normal operation mode is also written in application note AN2141, since the new STP08DP05 is compatible with the previous versions of the LED drivers.

Complete error detection timing diagram for checking the status of all 40 LEDs on the STEVAL-ILL002V3 or 4 is also shown in Figure 13 (right side). Error detection mode is divided to 5 timing intervals. The first interval allows enterance into error detection mode through generation of a special sequence on the latch and OE pins synchronized by the clock frequency. This sequence is described in Figure 6. When the LED drivers enter error detection mode the high level must be sent through SPI to the outputs and then latched. In the next step the status of incorrect LEDs is detected. An enlarged view of the third timing interval is provided in Figure 14. The OE is set to low level for at least 1 µs (in this case 50 µs) and one clock cycle (yellow) is applied. The status of the LEDs is obtained when OE is turned to high level as shown in the fourth timing interval (the detection result is read on the SDO on the falling edge of the SPI clock). First, the data are read from the last driver E, then from D, etc. To demonstrate the error detection feature the LED diode 39 (see the schematic diagram in Figure 16) was shorted and therefore the results coming from the LED drivers are the following:

● DRIVER A: 1111 1111

● DRIVER B: 1111 1111

● DRIVER C: 1111 1111

● DRIVER D: 1111 1111

● DRIVER E: 1011 1111 (output 6 faults)

As soon as the status of all LEDs is checked the LED drivers should return to the normal operational mode by generating a special sequence during fifth timing interval. The timing diagram for resuming normal mode is also shown in Figure 7.

Figure 13. Timing diagram for the STEVAL-ILL002V3 or 4 evaluation board

Normal

modeError detection mode

Zoom

CLK

SDO

LE

OE

1 2 3 4 5ABCE D


15/21

Figure 14. Detection diagram for STEVAL-ILL002V3 or 4 evaluation board

5.3 STP08DP05 vs. STP08CDC596 detection diagramFigure 15 shows the detection diagram for the STP08DP05 and STP08CDC596 LED drivers.

When the OE pin is "0" the LED drivers check the status of the LEDs. After this the output data (SDO) are read on the falling edge of the clock SPI. The resulting output bits are not the same for both drivers, as shown in the red frames in Figure 15. The seventh bit is read like the first for the STP08DP05, but for the STP08CDC596 the sixth bit is read. Therefore if both drivers are used in the application the LED status obtained from the drivers must be corrected by the SW, otherwise an erroneous status is detected (shifted by one bit).

CLK

LE

OE

SDO

Driver E

Output 6 fault detected


16/21

Figure 15. Detection diagram for STP08DP05 and STP08CDC596 LED drivers

SDO reading when the OE pin is turned to “1”

SDO reading when the OE pin is turned to “1”

STP08DP05 – detection diagram

STP08CDC596 – detection diagram


17/21

5.4 Schematic diagram

Figure 16. Schematic diagram

TxD

RxD

SD

0

SD

0R

DI

TD

O

RD

I

TD

O

RE

S

RE

S

VC

C

VC

C

VC

CV

CC

VC

CV

CC

VC

C

VC

C

VC

CVC

C

VC

C

VC

C

VC

C

Titl

e

Siz

eD

ocum

ent N

umbe

rR

ev<

Doc

><

Rev

Cod

e>

Dia

gnos

tic L

ED

Driv

er

B

Titl

e

Siz

eD

ocum

ent N

umbe

rR

ev<

Doc

><

Rev

Cod

e>

Dia

gnos

tic L

ED

Driv

er

B

Titl

e

Siz

eD

ocum

ent N

umbe

rR

ev<

Doc

><

Rev

Cod

e>

Dia

gnos

tic L

ED

Driv

er

BSTEVAL-ILL002V3 (OSRAM LEDs)

STEVAL-ILL002V4 (VISHAY LEDs)

FROM 7V UP TO 32V

INPUT VOLTAGE

D3

D3

C9

470n

F

C9

470n

F

1 2 3

J5C

ON

3J5

CO

N3

D37

D37

D20

D20

D12

D12

GN

D1

SD

I2

CL

K3

/LE

4

55

66

77

88

Vd

d1

6

R-E

XT

15

SD

O1

4

/OE

13

12

12

11

11

10

10

99

U4

ST

P08

DP

05/D

U4

ST

P08

DP

05/D

12

JP1

JUM

PE

R

JP1

JUM

PE

R

D29

D29

C4

100n

F

C4

100n

F

C7

100n

F

C7

100n

F

D4

D4

C8

470n

FC

847

0nF

C1

+1

V+

2

C1

-3

C2

+4

C2

-5

V-

6

T2

OU

T7

R2

IN8

Vd

d1

6

GN

D1

5

T1

OU

T1

4

R1

IN1

3

R1

OU

T1

2

T1

IN1

1

T2

IN1

0

R2

OU

T9

U6

ST

232A

BN

U6

ST

232A

BN

D38

D38

R13

360

R13

360

R4

1K3

R4

1K3

D21

D21

1 2 3 4 5 6 7 8 9 10

20

19

18

17

16

15

14

13

12

11

ST

7lite

3

U8

ST

7lite

3

U8

D13

D13

D30

D30

R9

10k

R9

10k

GN

D1

SD

I2

CL

K3

/LE

4

55

66

77

88

Vd

d1

6

R-E

XT

15

SD

O1

4

/OE

13

12

12

11

11

10

10

99

U5

ST

P08

DP

05/E

U5

ST

P08

DP

05/E

21

L133

uHL1

33uH

C22

100u

F/1

6V

C22

100u

F/1

6V

D5

D5

C12

2.2u

F

C12

2.2u

F

D39

D39

D22

D22

D14

D14

D31

D31

D6

D6

C13

10nF

C13

10nF

C1 2.

2uF

C1 2.

2uF

C15

100n

F

C15

100n

F

D40

D40

D23

D23

C11

470n

FC

1147

0nF

D15

D15

VO

UT

1V

IN8

GND 2

GND 3

GND 6

GND 7

INHIB 5

U7

LE50

/SO

U7

LE50

/SO

C5

100n

F

C5

100n

F

D32

D32

C16

10nF

C16

10nF

C19

10uF

/35V

C19

10uF

/35V

GN

D1

SD

I2

CL

K3

/LE

4

55

66

77

88

Vd

d1

6

R-E

XT

15

SD

O1

4

/OE

13

12

12

11

11

10

10

99

U1

ST

P08

DP

05/A

U1

ST

P08

DP

05/A

D7

D7

D24

D24

C18

22nF

C18

22nF

D16

D16

C20

220p

F

C20

220p

F

D33

D33

R3 1k

3

R3 1k

3

C10

470n

FC

1047

0nF

D8

D8

C17

100n

F

C17

100n

F

D41

ST

PS

340U

D41

ST

PS

340U

D25

D25

D17

D17

R5

1k3

R5

1k3

1 3

2 R2

10k

R2

10k

D34

D34

D9

D9

C14 10

nF

C14 10

nF

D26

D26

D18

D18

R6

1k3

R6

1k3

13579

2468

10

J1IC

PJ1

ICP

D1

D1

D35

D35

C6

100n

F

C6

100n

F

D44

SM

AJ3

3A-T

R

D44

SM

AJ3

3A-T

R

D10

D10

6 8 2 4

37

51

IO5

L597

0DIO

5L5

970D

1 3

2R1

10k

R1

10k

12

JP2

JUM

PE

RJP

2JU

MP

ER

D27

D27

D19

D19

R7

1k3

R7

1k3

+C2

10uF

+C2

10uF

+C

21 220u

F/2

5V+C

21 220u

F/2

5V

D2

D2

SW

2

SW

PU

SH

BU

TT

ON

SW

2

SW

PU

SH

BU

TT

ON

D36

D36

R8

10k

R8

10k

D42

GR

EE

N L

ED

D42

GR

EE

N L

ED

R14

560

R14

560

D11

D11

R12

2K2

R12

2K2

R10

4k7

R10

4k7

GN

D1

SD

I2

CL

K3

/LE

4

55

66

77

88

Vd

d1

6

R-E

XT

15

SD

O1

4

/OE

13

12

12

11

11

10

10

99

U2

ST

P08

DP

05/B

U2

ST

P08

DP

05/B

R11

6k8

R11

6k8

GN

D1

SD

I2

CL

K3

/LE

4

55

66

77

88

Vd

d1

6

R-E

XT

15

SD

O1

4

/OE

13

12

12

11

11

10

10

99

U3

ST

P08

DP

05/C

U3

ST

P08

DP

05/C

SW

1

SW

PU

SH

BU

TT

ON

SW

1

SW

PU

SH

BU

TT

ON

D28

D28

C3

100n

F

C3

100n

F

5 9 4 8 3 7 2 6 1

P1

CO

NN

EC

TO

R D

B9

P1

CO

NN

EC

TO

R D

B9


18/21

5.5 Bill of materials

Table 3. Bill of materials

Item Qty Reference Part Description Order code Supplier

1 2 C1,C12 2.2 µF/50 V Electrolytic capacitor

2 1 C2 10 µF/35 V Electrolytic capacitor

3 7C3,C4,C5,C6,C7,C15,

C17100 nF/50 V

Ceramic capacitor SMD 0805

4 4C8,C9,C10,

C11470 nF/16 V

Ceramic capacitor SMD 0805

5a 2 C14,C16 10 nF/50 VCeramic capacitor SMD

0805

5b 1 C13 10 nF/50 VCeramic capacitor SMD

1206

6 1 C18 22 nF/50 VCeramic capacitor SMD

0805

7 1 C19 10 µF/35 V Tantal capacitor

8 1 C20 220 pF/50 VCeramic capacitor SMD

0805

9 1 C21 220 µF/25 V Electrolytic capacitor

10 1 C22 100 µF/16 V Tantal capacitor

11 40

D1,D2,D3,D4,D5,D6,

D7,D8,D9,D10,

D11,D12,

D13,D14,D15,D16,

D17,D18,

D19,D20,D21,D22,

D23,D24,

D25,D26,D27,D28,

D29,D30,

D31,D32,D33,D34,

D35,D36,

D37,D38,D39,D40

LED

OSRAM SMD BLUE LED LB T68C-P2S1-35 OR VISHAY SMD GREEN

LED

VLMTG31N2S1 - GS08

OSRAM

OR VISHAY

12 1 D41 STPS340U Diode STPS340U STMicroelectronics

13 1 D42 GREEN LED SMD LED 1206

14 1 D44 SMAJ33A-TR Transil SMAJ33A-TR STMicroelectronics


19/21

15 1 IO5 L5970D DC/DC converter L5970D STMicroelectronics

16 2 JP1,JP2 JUMPER Jumpers + switches

17 1 J1 ICP Programming connector

18 1 J5 CON3 Input connector

19 1 L1 33 µH Inductor DO3316P-333ML COILCRAFT

20 1 P1 CONNECTOR DB9 CAN connector - 9 pins

21a 2 R1,R2 10 k Potenciometers with axis

21b 2 R8,R9 10 k SMD resistors 0805

22 5R3,R4,R5,

R6,R71k3 SMD resistors 1206

23 1 R10 4k7 SMD resistors 0805

24 1 R11 6k8 SMD resistors 1206

25 1 R12 2K2 SMD resistors 1206

26 1 R13 360 SMD resistors 1206

27 1 R14 560 SMD resistors 1206

28 2 SW1,SW2 SW PUSHBUTTON Switch

29 5U1,U2,U3,

U4,U5STP08DP05 LED drivers STP08DP05TTR STMicroelectronics

30 1 U6 ST232ABN RS232 driver ST232ABD STMicroelectronics

31 1 U7 LE50/SO Linear voltage regulator LE50ABD STMicroelectronics

32 1 U8 ST7lite3 Microcontroller ST7FLITE39F2M6 STMicroelectronics

Table 3. Bill of materials (continued)

Item Qty Reference Part Description Order code Supplier

Conclusion AN2478

20/21

6 Conclusion

The new features of STP08DP05 and STP16DP05 allow improved control of the application. The full detection test enables the device to provide feedback to the microcontroller, and the feedback of the error detection can be managed locally or remotely.

7 Revision history

Table 4. Document revision history

Date Revision Changes

07-Mar-2007 1 Initial release

22-May-2007 2 Minor text changes

31-Aug-2007 3– From Section 4.1 to Section 5.5 added

– Chapter 6 modified

AN2478

21/21

Please Read Carefully:

Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve theright to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at anytime, without notice.

All ST products are sold pursuant to ST’s terms and conditions of sale.

Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes noliability whatsoever relating to the choice, selection or use of the ST products and services described herein.

No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of thisdocument refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party productsor services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of suchthird party products or services or any intellectual property contained therein.

UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIEDWARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIEDWARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWSOF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.

UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOTRECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAININGAPPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY,DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVEGRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK.

Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately voidany warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, anyliability of ST.

ST and the ST logo are trademarks or registered trademarks of ST in various countries.

Information in this document supersedes and replaces all information previously supplied.

The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.

© 2007 STMicroelectronics - All rights reserved

STMicroelectronics group of companies

Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America

www.st.com

Documents

STP08DP05, STP16DP05 Normal mode and error detection features