cd00277876

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
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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
5
6
Operating supply conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1
Load selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2
Fixed STHV748 pins on PCB demo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Demonstration kit composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.1
Method 1 (flexible - based on BNC PCB adapter) . . . . . . . . . . . . . . . . . . 18
6.1.1
6.2
6.3
7
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Capacitances and resistances list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
How to drive the STHV748 for method 1 . . . . . . . . . . . . . . . . . . . . . . . . 19
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
Method 3 (LabView interface - use of the HSDIO PCB connector) . . . . . 29
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Doc ID 17689 Rev 1
AN3240
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.
Pinout configuration table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
STHV748 truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Capacitances and resistances list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
C1 head connector pin vs STHV748 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
DC working supply conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Current consumption in CW mode, @ 5 MHz, HVP/M1=±5 V, no-load . . . . . . . . . . . . . . . 15
Power-up sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Special pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
STM3210E-EVAL pin configuration table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
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List of figures
AN3240
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.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
Figure 30.
4/32
STHV748 single channel block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
PCB demo schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
PCB top layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
C1 (CONN1) head connector description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
PCB demo image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Load configuration schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Demonstration kit composition (PCB demo plus BNC PCB adapter) . . . . . . . . . . . . . . . . . 18
PCB adapter image, top layout and top schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Demonstration kit system image. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Inputs set of generators for PW mode (4 cycles - TX0 pulser Chx) . . . . . . . . . . . . . . . . . . 19
Diodes LED status on the PCB adapter which indicates IN4=1 and IN3=0 . . . . . . . . . . . . 20
Demonstration kit based on the STM3210E-EVAL system . . . . . . . . . . . . . . . . . . . . . . . . 20
Demonstration kit based on the STM3210E-EVAL system image . . . . . . . . . . . . . . . . . . . 21
STM3210E-EVAL pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
PW mode functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
CW mode functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
PC mode functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Supply connection for demonstration kit with the STM3210E-EVAL . . . . . . . . . . . . . . . . . 23
Main menu on STM3210E-EVAL display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Main menu selection on the STM3210E-EVAL display . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Example of “Continuous Mode” selection on the STM3210E-EVAL display. . . . . . . . . . . . 25
Exit the mode selected on the STM3210E-EVAL display . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Reset key on the STM3210E-EVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
PW mode (HVP0=60 V HVM0=-60 V 100 W//300 pF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
CW mode HVP1=5 V HVM1=-5 V 100 W//300 pF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
CW mode HVP1=10 V HVM1=-10 V 100 W//300 pF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
PC mode HVP0=60 V HVM0=-60 V 100 W//300 pF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
LabView equipment used to develop the STHV749 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
STHV748 LabView PC control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
STHV748 demo system for LabView evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
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AN3240
1
STHV748 - pinout configuration
STHV748 - pinout configuration
Table 1.
Pinout configuration table
Pin number
Pin name
1
AGND
2
RIF_HVM1_1
3
HVM1_A
4
HVM0_A
5
HVOUT_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
Table 1.
6/32
AN3240
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
1
0
0
0
1
HVM0
1
0
0
1
0
HVP0
1
x
0
1
1
HVR_SW
1
0
1
0
1
HVM1
1
0
1
1
0
HVP1
1
0
1
1
1
HZ
1
1
1
1
1
HVR_SW
1
1
0
0
1
Max HVM0 & HVM1
1
1
0
1
0
Max HVP0 & HVP1
1
1
1
0
1
CW HVM1
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STHV748 block diagram and truth table
Table 2.
AN3240
STHV748 truth table (continued)
Global
8/32
Per channel
State
THSD
IN4
IN3
IN2
IN1
1
1
1
1
0
CW HVP1
0
x
x
x
x
HZ
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AN3240
3
STHV748 PCB demo description
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.
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PCB demo description
Figure 2.
AN3240
4
PCB demo schematic
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PCB demo description
10/32
!-V
AN3240
4.0.1
PCB demo description
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(1)
R14
SM0805
75 Ω
LV
R15
SM0805
75 Ω
LV
R16
SM0805
75 Ω
LV
R1ChA
SM2512
200 Ω
2W
R1ChB
SM2512
200 Ω
2W
R1ChC
SM2512
200 Ω
2W
R1ChD
SM2512
200 Ω
2W
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PCB demo description
Table 3.
12/32
AN3240
Capacitances and resistances list (continued)
Name
Type
Value
Class
R2
SM0805
10 kΩ
LV
R2ChA
SM2512
200 Ω
2W
R2ChB
SM2512
200 Ω
2W
R2ChC
SM2512
200 Ω
2W
R2ChD
SM2512
200 Ω
2W
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
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
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PCB demo description
Table 4.
AN3240
C1 head connector pin vs STHV748 pinout
Channel
CN1-pin (head
connector)
STHV748 pin name
STHV748 pin number
31
IN1_A
63
33
IN2_A
62
14
IN3_A
61
34
IN1_C
31
23
IN2_C
30
17
IN3_C
29
9
IN1_B
18
13
IN2_B
19
15
IN3_B
20
1
IN1_D
50
5
IN2_D
51
19
IN3_D
52
26
IN4
17
A
C
B
D
All channel
Figure 5.
14/32
PCB demo image
Doc ID 17689 Rev 1
AN3240
5
Operating supply conditions
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:
Table 6.
The high voltage pins must be HVP0 ≥ HVP1 and HVM1 ≥
HVM0
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
2
VDDM or VDD
3
VDD or VDDM
4
HVM0
5
HVP0
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Operating supply conditions
Table 7.
AN3240
Power-up sequence (continued)
Power up sequence
Note:
6
HVM1 or HVP1
7
HVP1 or HVM1
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.
16/32
Load configuration schematic
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AN3240
5.2
Operating supply conditions
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 Table 8.
Table 8.
Special pin connections
Special pins on the PCB demo
Name
Description
Status on board
EN 64-pin
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
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
THSD 32-pin
Thermal shutdown pin
Active – forced to 3 V through R2=10
kΩ. The user can monitor the THSD
status on TP1 (test point)
D_CTR 16-pin
Delay control pin
Not active – forced directly to ground
EXPOSED-PAD
Substrate
Not active – connected to ground
through Cs1=0.22 µF
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Demonstration kit composition
6
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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 Table 2 and Figure 8). The composition of the demonstration kit is
shown in Figure 7 and 9.
Figure 7.
Figure 8.
Demonstration kit composition (PCB demo plus BNC PCB adapter)
PCB adapter image, top layout and top schematic
!-V
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Demonstration kit composition
Figure 9.
6.1.1
Demonstration kit system image
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)
,1
,1
&+
,1
&+
,1
9
,1
9'&JHQHUDWRU
9
,1
9'&JHQHUDWRU
([WHUQDOVHWRIJHQHUHWRUV
IRU3:PRGHF\FOHV
7
7BFO
+93
;'&5
+90
Note:
!-V
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.
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Demonstration kit composition
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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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Demonstration kit composition
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.
Channel
A
STM3210E-EVAL pin configuration table
Gates
CN1-pin
(motherboard side)
(motherboard side)
PA0
STHV748 pin name
STHV748 pin number
31
IN1_A
63
PA1
33
IN2_A
62
PC0
14
IN3_A
61
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Demonstration kit composition
Table 9.
Channel
STM3210E-EVAL pin configuration table (continued)
Gates
CN1-pin
(motherboard side)
(motherboard side)
PA2
C
B
D
All
channel
6.2.2
AN3240
STHV748 pin name
STHV748 pin number
34
IN1_C
31
PA3
23
IN2_C
30
PC2
17
IN3_C
29
PB0
9
IN1_B
18
PB1
13
IN2_B
19
PC1
15
IN3_B
20
PA6
1
IN1_D
50
PA7
5
IN2_D
51
PC3
19
IN3_D
52
PC5
26
IN4
17
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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Demonstration kit composition
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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Demonstration kit composition
6.2.3
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Turn on demo system
1.
First step:
Connect all supplies as indicated in Figure 18 based on the following power up sequence
(see Table 7):
2.
–
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)
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:
–
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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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Demonstration kit composition
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
Demonstration kit composition
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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Demonstration kit composition
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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
Demonstration kit composition
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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Demonstration kit composition
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Figure 29. STHV748 LabView PC control panel
Figure 30. STHV748 demo system for LabView evaluation
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7
Revision history
Revision history
Table 10.
Document revision history
Date
Revision
21-Dec-2010
1
Changes
Initial release.
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