ST AN3240 Application note

AN3240

Application note

Ultrasound HV pulser demonstration board

Introduction

This application note describes all the possible demo applications helpful in carrying out a
full evaluation of STHV748 functions.

The STHV748 high-voltage, high-speed pulser generator features four independent
channels. It is designed for medical ultrasound applications, but can also be used for other
piezoelectric, capacitive, or MEMS transducers.

The device contains a controller logic interface circuit, level translators, MOSFET gate
drivers, noise blocking diodes, and high-power P-channel and N-channel MOSFETs as
output stages for each channel. There is also a clamping-to-ground circuitry, anti-leakage,
an anti-memory effect block, a thermal sensor, and a HV receiver switch (HVR_SW), which
guarantees a strong decoupling during the transmission phase.

Moreover, the STHV748 includes self-biasing and thermal shutdown blocks (see block
diagram in Figure 1). Each channel can support up to five active output levels with two half
bridges. The output stage of each channel is able to provide ±2 A peak output current. In
order to reduce power dissipation during continuous wave mode, the peak current is limited
to 0.6 A (a dedicated half bridge is used).

December 2010 Doc ID 17689 Rev 1 1/32

www.st.com

Contents AN3240

Contents

1 STHV748 - pinout configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 STHV748 block diagram and truth table . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 STHV748 PCB demo description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4 PCB demo description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.0.1 Capacitances and resistances list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

5 Operating supply conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.1 Load selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2 Fixed STHV748 pins on PCB demo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6 Demonstration kit composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

6.1 Method 1 (flexible - based on BNC PCB adapter) . . . . . . . . . . . . . . . . . . 18

6.1.1 How to drive the STHV748 for method 1 . . . . . . . . . . . . . . . . . . . . . . . . 19

6.2 Method 2 (use of the motherboard based on the STM3210E-EVAL) . . . . 20

6.2.1 Motherboard communication setting . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.2.2 Motherboard driving performance for the PCB demo . . . . . . . . . . . . . . 22

6.2.3 Turn on demo system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6.2.4 Turn off demo system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

6.2.5 Acquisition examples of PW, CW and PC mode . . . . . . . . . . . . . . . . . . 27

6.3 Method 3 (LabView interface - use of the HSDIO PCB connector) . . . . . 29

7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

2/32 Doc ID 17689 Rev 1

AN3240 List of tables

List of tables

Table 1. Pinout configuration table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Table 2. STHV748 truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 3. Capacitances and resistances list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 4. C1 head connector pin vs STHV748 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Table 5. DC working supply conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 6. Current consumption in CW mode, @ 5 MHz, HVP/M1=±5 V, no-load . . . . . . . . . . . . . . . 15

Table 7. Power-up sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 8. Special pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Table 9. STM3210E-EVAL pin configuration table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Table 10. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Doc ID 17689 Rev 1 3/32

List of figures AN3240

List of figures

Figure 1. STHV748 single channel block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 2. PCB demo schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 3. PCB top layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 4. C1 (CONN1) head connector description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 5. PCB demo image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 6. Load configuration schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 7. Demonstration kit composition (PCB demo plus BNC PCB adapter) . . . . . . . . . . . . . . . . . 18

Figure 8. PCB adapter image, top layout and top schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 9. Demonstration kit system image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 10. Inputs set of generators for PW mode (4 cycles - TX0 pulser Chx) . . . . . . . . . . . . . . . . . . 19

Figure 11. Diodes LED status on the PCB adapter which indicates IN4=1 and IN3=0 . . . . . . . . . . . . 20

Figure 12. Demonstration kit based on the STM3210E-EVAL system . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 13. Demonstration kit based on the STM3210E-EVAL system image . . . . . . . . . . . . . . . . . . . 21

Figure 14. STM3210E-EVAL pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 15. PW mode functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 16. CW mode functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 17. PC mode functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 18. Supply connection for demonstration kit with the STM3210E-EVAL . . . . . . . . . . . . . . . . . 23

Figure 19. Main menu on STM3210E-EVAL display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 20. Main menu selection on the STM3210E-EVAL display . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 21. Example of “Continuous Mode” selection on the STM3210E-EVAL display. . . . . . . . . . . . 25

Figure 22. Exit the mode selected on the STM3210E-EVAL display . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 23. Reset key on the STM3210E-EVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 24. PW mode (HVP0=60 V HVM0=-60 V 100 W//300 pF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 25. CW mode HVP1=5 V HVM1=-5 V 100 W//300 pF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 26. CW mode HVP1=10 V HVM1=-10 V 100 W//300 pF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 27. PC mode HVP0=60 V HVM0=-60 V 100 W//300 pF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 28. LabView equipment used to develop the STHV749 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 29. STHV748 LabView PC control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 30. STHV748 demo system for LabView evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

4/32 Doc ID 17689 Rev 1

AN3240 STHV748 - pinout configuration

1 STHV748 - pinout configuration

Table 1. Pinout configuration table

Pin number Pin name

1AGND

2 RIF_HVM1_1

3HVM1_A

4HVM0_A

5HVOUT_A

6 HVP0_A

7 RIF_HVP1_1

8 HVP1_A

9 HVP1_B

10 RIF_HVP0_1

11 HVP0_B

12 HVOUT_B

13 HVM0_B

14 HVM1_B

15 RIF_HVM0_1

16 D_CTR

17 IN4

18 IN1_B

19 IN2_B

20 IN3_B

21 VDDP_1

22 GND_PWR_3

23 XDCR_B

24 LVOUT_B

25 LVOUT_C

26 XDCR_C

27 GND_PWR_2

28 VDDM_1

29 IN3_C

30 IN2_C

31 IN1_C

32 THSD

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STHV748 - pinout configuration AN3240

Table 1. Pinout configuration table (continued)

Pin number Pin name

33 AGND_1

34 RIF_HVM1

35 HVM1_C

36 HVM0_C

37 HVOUT_C

38 HVP0_C

39 RIF_HVP1

40 HVP1_C

41 HVP1_D

42 RIF_HVP0

43 HVP0_D

44 HVOUT_D

45 HVM0_D

46 HVM1_D

47 RIF_HVM0

48 DGND

49 DVDD

50 IN1_D

51 IN2_D

52 IN3_D

53 VDDP

54 GND_PWR_1

55 XDCR_D

56 LVOUT_D

57 LVOUT_A

58 XDCR_A

59 GND_PWR

60 VDDM

61 IN3_A

62 IN2_A

63 IN1_A

64 EN

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AN3240 STHV748 block diagram and truth table

2 STHV748 block diagram and truth table

Figure 1. STHV748 single channel block diagram

Table 2. STHV748 truth table

Global Per channel State

THSD IN4 IN3 IN2 IN1

1 x x 0 0 Clamp

10001 HVM0

10010 HVP0

1x011 HVR_SW

10101 HVM1

10110 HVP1

10111 HZ

11111 HVR_SW

11001Max HVM0 & HVM1

1 1 0 1 0 Max HVP0 & HVP1

11101 CW HVM1

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STHV748 block diagram and truth table AN3240

Table 2. STHV748 truth table (continued)

Global Per channel State

THSD IN4 IN3 IN2 IN1

11110 CW HVP1

0xxxx HZ

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AN3240 STHV748 PCB demo description

3 STHV748 PCB demo description

The STHV748 PCB demo can drive four transducers as 4-channel transmitters/receivers for
ultrasound and other applications. The demo board consists of one STHV748 in a 64-lead
9x9x1 mm QFN package.

The STHV748 can deliver up to a ±2.0 A source and sink current to a capacitive transducer.
It is designed for medical ultrasound imaging and ultrasound material NDT applications.

The STHV748 output waveforms can be displayed directly for each channel Ch A/B/C/D
using an oscilloscope by connecting the scope probe to the J1, J2, J3, and J4 jumpers,
moreover, the user can select whether or not to connect the onboard equivalent load, a 300
pF 200 V capacitor paralleled with a 100 Ω, 2 W resistor (or alternatively, 200 Ω//50 pF -
200 Ω//250 pF - no-load). A coaxial cable can also be used to easily connect the user
transducer.

IN1/2/3/4, for each channel available in IC, is controlled via the 13 pins of the C1 (CONN1)
head connector on the board (34 pins).

The main issues in this PCB design are the capacitance values, to ensure good filtering and
an effective decoupling between the low voltage inputs (IN1, IN2, IN3, IN4, and EN for each
channel) and the HV switching signals (XDCR, HVOUT, etc.,) which is ensured by the layer
separation used.

Doc ID 17689 Rev 1 9/32

4 PCB demo description

Figure 2. PCB demo schematic

Doc ID 17689 Rev 1 10/32

AN3240 PCB demo description

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AN3240 PCB demo description

4.0.1 Capacitances and resistances list

Table 3. Capacitances and resistances list

Name Type Value Class

C2ChD SMC0805 250 pF 100 V

C3 SMC1206 0.22 µF 100 V

C4 SMC1206 0.22 µF 100 V

C5 SMC1206 0.22 µF 100 V

C6 SMC1206 0.22 µF 100 V

C7 SMC1206 0.22 µF 100 V

C8 SMC1206 0.22 µF 100 V

C9 SMC1206 0.22 µF 100 V

CLVA SMC0805 20 pF LV

CLVB SMC0805 20 pF LV

CLVC SMC0805 20 pF LV

CLVD SMC0805 20 pF LV

Cm1 SMC0603 3.5 nF LV

Cm2 SMC0603 3.5 nF LV

Cm3 SMC0603 3.5 nF LV

Cm4 SMC0603 3.5 nF LV

Cp1 SMC0603 20 nF LV

Cp2 SMC0603 20 nF LV

Cp3 SMC0603 20 nF LV

Cp4 SMC0603 20 nF LV

Cs1 SMC1206 0.22 µF 100 V

R1 SM0805 10 kΩ LV

R10 SM2010 50 Ω 250 mW

R11 SM2010 50 Ω 250 mW

R12 SM2010 50 Ω 250 mW

R13 SM0805 75 Ω LV

R14 SM0805 75 Ω LV

R15 SM0805 75 Ω LV

R16 SM0805 75 Ω LV

R1ChA SM2512 200 Ω 2 W

R1ChB SM2512 200 Ω 2 W

(1)

R1ChC SM2512 200 Ω 2 W

R1ChD SM2512 200 Ω 2 W

Doc ID 17689 Rev 1 11/32

PCB demo description AN3240

Table 3. Capacitances and resistances list (continued)

Name Type Value Class

R2 SM0805 10 kΩ LV

R2ChA SM2512 200 Ω 2 W

R2ChB SM2512 200 Ω 2 W

R2ChC SM2512 200 Ω 2 W

R2ChD SM2512 200 Ω 2 W

R3 SM2010 50 Ω 250 mW

R4 SM2010 50 Ω 250 mW

R5 SM2010 50 Ω 250 mW

R6 SM2010 50 Ω 250 mW

R7 SM2010 50 Ω 250 mW

R8 SM2010 50 Ω 250 mW

R9 SM2010 50 Ω 250 mW

RLVA SM0805 200 Ω LV

RLVB SM0805 200 Ω LV

RLVC SM0805 200 Ω LV

RLVD SM0805 200 Ω LV

C1 SMC1206 0.22 µF 100 V

C10 SMC1206 0.22 µF 100 V

C11 SMC1206 0.22 µF 100 V

C12 SMC1206 0.22 µF 100 V

C13 SMC1206 0.22 µF 100 V

C14 SMC1206 0.22 µF 100 V

C15 SMC1206 0.22 µF 100 V

C16 SMC1206 0.22 µF 100 V

C17 SMC0603 0.22 µF LV

C18 SMC0603 0.22 µF LV

C19 SMC0603 0.22 µF LV

C1ChA SMC0805 50 pF 100 V

C1ChB SMC0805 50 pF 100 V

C1ChC SMC0805 50 pF 100 V

C1ChD SMC0805 50 pF 100 V

C2 SMC1206 0.22 µF 100 V

C20 SMC0603 0.22 µF LV

C21 SMC0603 0.22 µF LV

C22 SMCVF 22 µF 100 V

12/32 Doc ID 17689 Rev 1

AN3240 PCB demo description

Table 3. Capacitances and resistances list (continued)

Name Type Value Class

C23 SMCVF 22 µF 100 V

C24 SMCVF 22 µF 100 V

C25 SMCVF 22 µF 100 V

C26 SMCVC 22 µF 16 V

C27 SMCVC 22 µF 16 V

C28 SMCVC 22 µF 16 V

C2ChA SMC0805 250 pF 100 V

C2ChB SMC0805 250 pF 100 V

C2ChC SMC0805 250 pF 100 V

1. LV stands for Low voltage class

Figure 3. PCB top layout

Figure 4. C1 (CONN1) head connector description

Doc ID 17689 Rev 1 13/32

PCB demo description AN3240

Table 4. C1 head connector pin vs STHV748 pinout

Channel

A

C

B

D

All channel 26 IN4 17

CN1-pin (head

connector)

31 IN1_A 63

33 IN2_A 62

14 IN3_A 61

34 IN1_C 31

23 IN2_C 30

17 IN3_C 29

9IN1_B18

13 IN2_B 19

15 IN3_B 20

1 IN1_D 50

5 IN2_D 51

19 IN3_D 52

STHV748 pin name STHV748 pin number

Figure 5. PCB demo image

14/32 Doc ID 17689 Rev 1

AN3240 Operating supply conditions

5 Operating supply conditions

Table 5. DC working supply conditions

Operating supply voltages

Symbol Parameter Min Typ Max Value

VDDP Positive supply voltage 2.7 3 3.6 V

VDDM Negative supply voltage -2.7 -3 -3.6 V

VDD Positive logic voltage 2.4 3 Min(3.6,VDDP+0.3) V

HVP0 TX0 high voltage positive supply 95 V

HVP1 TX1 high voltage positive supply 95 V

HVM0 TX0 high voltage negative supply -95 V

HVM1 TX1 high voltage negative supply -95 V

Warning: The high voltage pins must be HVP0 ≥ HVP1 and HVM1 ≥

HVM0

Table 6. Current consumption in CW mode, @ 5 MHz, HVP/M1=±5 V, no-load

Current consumption

Symbol Parameter value

IVDDP Positive supply current 8.6 mA

IVDDM Negative supply current 13.5 mA

IDVDD Positive logic current 0.11 mA

IHVP1 TX1 high voltage positive supply current 14.5 mA

IHVM1 TX1 high voltage negative supply current 11 mA

Table 7. Power-up sequence

Power up sequence

1 VDDP

2VDDM or VDD

3 VDD or VDDM

4HVM0

5 HVP0

Doc ID 17689 Rev 1 15/32

Operating supply conditions AN3240

Table 7. Power-up sequence (continued)

Power up sequence

6 HVM1 or HVP1

7 HVP1 or HVM1

Note: VDD: Logic voltage, 0 to 3 V (B5 conn.)

VDDP: Positive supply voltage 0 to 3 V (B6 conn.)

VDDM :Negative supply voltage -3 V to 0 (B7 conn.)

HVM0: TX0 high voltage negative supply, (B3 conn.)

HVP0:TX0 High voltage positive supply, (B1 conn.)

HVM1:TX1 high voltage negative supply, (B4 conn.)

HVP1:TX1 High voltage positive supply, (B2 conn.)

5.1 Load selection

It is possible to select the following load configuration for each channel (ChA/B/C/D) using
J1, J2, J3, and J4:

● 100 Ω // 300 pF

● 200 Ω // 50 pF

● 200 Ω // 250 pF

● No-load

Figure 6. Load configuration schematic

16/32 Doc ID 17689 Rev 1

AN3240 Operating supply conditions

5.2 Fixed STHV748 pins on PCB demo

In order to clarify some special pin behavior, a short explanation is given:

EN allows the minimizing of the power consumption. If EN=0, the self-voltage reference is
not supplied. By supplying the reference externally, the total power consumption is reduced.

THSD is a thermal flag. The output stage of the THSD pin is a Nch-MOS open-drain, so it is
necessary to connect the external pull-up resistance (R2≥10 kΩ) to the positive low-voltage
supply (see Figure 2). If the internal temperature surpasses 160 °C, THSD goes down and
puts all the channels into HZ state. By externally forcing THSD to a positive low-voltage
supply, the thermal protection is disabled.

D_CTR can be used to optimize 2nd HD performance by tuning the fall propagation delay
(TDF - see the datasheet, STHV748; 5-level, ±90 V, 2 A high speed pulser with four
independent channels). If D_CTR is equal to ground, TDF has the nominal value. If D_CTR
is being varied from 2 V to 4.2 V, TDF can be changed from -1 ns to +600 ps, with respect to
the nominal value.

EXPOSED-PAD is internally connected to the substrate. It can be floating or connected to a
100 V capacitance toward ground, in order to reduce noise during the receiving phase. The
fixed configuration of the PCB application pins described is given in Tab le 8 .

Table 8. Special pin connections

Special pins on the PCB demo

Name Description Status on board

Enable pin

With EN=1, the IC internally generates the reference

voltages on REF_HVP1/0 (7, 10, 39, 42-pin) and

REF_HVM1/0 (2, 15, 34, 47-pin). These voltages are set

EN 64-pin

THSD 32-pin Thermal shutdown pin

D_CTR 16-pin Delay control pin Not active – forced directly to ground

EXPOSED-PAD Substrate

VDDP below HVP and VDDP above HVM, respectively:

REF_HVM# = HVM# + VDDP

REF_HVP# = HVP# - VDDP

When EN=0, it is required that an external voltage is

applied to REF_HVM# and REF_HVP# pins (see the

STHV748 datasheet).

Active – forced to 3 V through

R1=10 kΩ

Active – forced to 3 V through R2=10

kΩ. The user can monitor the THSD

status on TP1 (test point)

Not active – connected to ground

through Cs1=0.22 µF

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Demonstration kit composition AN3240

6 Demonstration kit composition

There are essentially 3 methods to drive the STHV748 demo board, for each of them the
user must connect a custom PCB adapter, via the C1 connector, to drive the IC pulser.

6.1 Method 1 (flexible - based on BNC PCB adapter)

In this case, the demo board, described in Section 3, is being connected up, via the C1
connector, to a custom PCB adapter with 8 BNC connectors. A couple of BNC are dedicated
to IN1 and IN2 for each channel and usable for the external waveforms generator. In
addition, 2 switches are dedicated to connecting IN3 and IN4 to 0V or VDD, in accordance
with the truth table (see Tab l e 2 and Figure 8). The composition of the demonstration kit is
shown in Figure 7 and 9.

Figure 7. Demonstration kit composition (PCB demo plus BNC PCB adapter)

Figure 8. PCB adapter image, top layout and top schematic

18/32 Doc ID 17689 Rev 1

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AN3240 Demonstration kit composition

Figure 9. Demonstration kit system image

6.1.1 How to drive the STHV748 for method 1

The user simply needs a clock generator (or an AVG) in a way to drive pins IN1 and IN2 with
a proper time pulse width, consequently, it is possible to fix a truth table state for XDCR
using the 2 switches on the PCB adapter connected to VDD supply or GND, which control
IN3 and IN4. See the example diagram below (Figure 10):

Figure 10. Inputs set of generators for PW mode (4 cycles - TX0 pulser Chx)

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9'&JHQHUDWRU

([WHUQDOVHWRIJHQHUHWRUV

IRU3:PRGHF\FOHV

&+

&+

,1

,1



9

,1



,1

9

+93

;'&5

+90









7

7BFO

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Note: The DC generators, shown in Figure 10, are symbolic, in the truth table the VDD voltage is

selected by the user through the J9 jumper on the PCB demo, which supplies the switches
on the PCB adapter.

In Figure 10, an example of a TX0 pulser in PW mode setting, is described. It is possible to
pass easily to a TX1 pulser PW mode in the same example shown in Figure 10, in fact, it is
enough to change the IN3 status, through the switch on the PCB adapter, from 0 to VDD
(IN4=0 - not touched). This simple commutation on switch IN3 allows 4 cycles for the TX1
pulser.

Doc ID 17689 Rev 1 19/32

Demonstration kit composition AN3240

In the same manner the user fixes the other states, such as CW mode (IN3=VDD,
IN4=VDD) or MaxHV0 and HV1 mode (IN3=0, IN4=VDD), by just changing the switch
position on the PCB adapter.

The status of switches IN3 and IN4 is being monitored by two SMD LED diodes, for each
switch, on the PCB adapter (D1 red and D2 green close to IN3, D3 red and D4 green close
to IN4).

As shown in Figure 11, the red light near the switch indicates state 1 (when VDD voltage is
active, the switch button is in the left position) while the green light indicates state 0 (when 0
is active, the switch button is in the right position).

Figure 11. Diodes LED status on the PCB adapter which indicates IN4=1 and IN3=0

When the switch button is in the center position the status is on HZ.

6.2 Method 2 (use of the motherboard based on the STM3210E­EVAL)

The demo kit, in this solution, is made up of a motherboard based on the STM3210E-EVAL
plus the PCB demo mentioned into Section 3 (see Figure 12). It doesn't require any manual
driving because the STM3210E-EVAL microcontroller is programmed to deliver some demo
patterns.

Figure 12. Demonstration kit based on the STM3210E-EVAL system

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Figure 13. Demonstration kit based on the STM3210E-EVAL system image

6.2.1 Motherboard communication setting

The STM3210E-EVAL system communicates with the PCB demo through the C1 connector,
following the signal setting represented in Figure 14.

Figure 14. STM3210E-EVAL pin connection

Table 9. STM3210E-EVAL pin configuration table

Channel

A

Gates

(motherboard side)

PA 0 3 1 I N1 _ A 6 3

PA 1 3 3 I N2 _ A 6 2

PC0 14 IN3_A 61

CN1-pin

(motherboard side)

STHV748 pin name STHV748 pin number

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Table 9. STM3210E-EVAL pin configuration table (continued)

Channel

C

B

D

All

channel

Gates

(motherboard side)

PA 2 3 4 I N 1 _C 3 1

PA 3 2 3 I N 2 _C 3 0

PC2 17 IN3_C 29

PB0 9 IN1_B 18

PB1 13 IN2_B 19

PC1 15 IN3_B 20

PA 6 1 I N 1_ D 5 0

PA 7 5 I N 2_ D 5 1

PC3 19 IN3_D 52

PC5 26 IN4 17

CN1-pin

(motherboard side)

STHV748 pin name STHV748 pin number

6.2.2 Motherboard driving performance for the PCB demo

The STM3210E-EVAL demonstration board (motherboard) has been programmed to show
the STHV748’s main functions. In particular, the firmware installed into the internal memory
allows the PCB demo to be driven in a way that the STHV748 pulser performs an example
of three work conditions:

● Pulse wave mode (PW), (see Figure 15)

● Continuous wave mode (CW), (see Figure 16)

● Pulse cancellation mode (PC), (see Figure 17)

Figure 15. PW mode functions

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Figure 16. CW mode functions

Figure 17. PC mode functions

Figure 18. Supply connection for demonstration kit with the STM3210E-EVAL

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6.2.3 Turn on demo system

1. First step:

Connect all supplies as indicated in Figure 18 based on the following power up sequence
(see Ta bl e 7):

– 1st USB connection (power supply for the motherboard and digital supply DVDD

for the STHV748)

– 2nd analog low voltage connections for the daughter board (VDDP=+3 V,

VDDM=-3 V)

– 3rd high voltage power supply connections for the daughter board (HVP0/1=+90 V,

HVM0/1=-90 V)

2. Second step:

– After the power supply connections, the onboard display appears as follows

(Figure 19):

Figure 19. Main menu on STM3210E-EVAL display

3. Third step:

– By moving the “Joystick” key up and down the user can select one of the three

modes available (PW, CW or PC mode) in the “Main menu”. When the user has
selected a mode the Joystick key must be pressed to descend into the mode menu
(see Figure 20).

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Figure 20. Main menu selection on the STM3210E-EVAL display

– Assuming that the user has descended into the “Continuous Mode” menu, it is

possible to manage the PW mode. In fact, by moving the Joystick key “Generate
Signals” can be selected (see Figure 21). The Joystick key must now be pressed
to run the PW mode function. If the user wants to change the choice, it is enough
to select and press “Return” to go to the main menu and choose another function,
such as CW or PC.

Figure 21. Example of “Continuous Mode” selection on the STM3210E-EVAL display

– After having run the mode, the user can stop the “Continuous Mode” and return to

the previous menu just by pressing the Joystick key on the board (see Figure 22).

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Figure 22. Exit the mode selected on the STM3210E-EVAL display

6.2.4 Turn off demo system

4. Fourth step

Demo off can be executed by following the power down sequence:

– 1st high voltage power off (HVP0/1=+90 V, HVM0/1=-90 V)

– 2nd low voltage power off (VDDP=+3 V, VDDM=-3 V)

– 3rd unplug the USB connection (power off supply for the motherboard)

Figure 23. Reset key on the STM3210E-EVAL

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6.2.5 Acquisition examples of PW, CW and PC mode

Figure 24. PW mode (HVP0=60 V HVM0=-60 V 100 Ω//300 pF)

Figure 25. CW mode HVP1=5 V HVM1=-5 V 100 Ω//300 pF

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Figure 26. CW mode HVP1=10 V HVM1=-10 V 100 Ω//300 pF

Figure 27. PC mode HVP0=60 V HVM0=-60 V 100 Ω//300 pF

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6.3 Method 3 (LabView interface - use of the HSDIO PCB connector)

The user, who has the possibility of using LabView equipment, as shown in Figure 28, can
evaluate the STHV748 detailed functions.

Figure 28. LabView equipment used to develop the STHV749

In this case, customized software has been developed (STHV748.vi) to manage all
channels in such a way as to test them in several working conditions (see the PC display -

Figure 29).

In the case of the user having the LabView chain, previously mentioned, it's possible to
connect the PCB demo to the LabView system through a PCB connector shown in

Figure 30.

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Figure 29. STHV748 LabView PC control panel

Figure 30. STHV748 demo system for LabView evaluation

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AN3240 Revision history

7 Revision history

Table 10. Document revision history

Date Revision Changes

21-Dec-2010 1 Initial release.

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AN3240

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