STMicroelectronics STEVAL-IHT005V2 User manual

October 2013 DocID024503 Rev 1 1/27
UM1631
User manual
STEVAL-IHT005V2 - 3.3 V control of ACS®/Triac with STM32™
Introduction
The STEVAL-IHT005V2 demonstration board is designed for the home appliance market,
with a focus on the demonstration of a robust solution with a 3.3 V supplied 32-bit MCU.
Targeted applications are mid-end and high-end washing machines, dishwashers and
dryers with different kinds of ACS®/Triacs.
The demonstration board is based on the recently introduced 48-pin, 32-bit
STM32F100C4T6B MCU running at 24 MHz (RC user-trimmable internal RC clock),
featuring 16 kBytes of Flash memory, 12-bit A/D converter, 5 timers, communication
interfaces, and 4 kBytes of SRAM.
The power supply circuitry is based on the VIPer®16L, an offline converter with an 800 V
avalanche rugged power section, operating at 60 kHz. The power supply provides negative
6 V in buck-boost topology.
The STEVAL-IHT005V2 can control 2 high power loads up to 2830 W thanks to the T1635H,
a 16 A, 600 V high temperature Triac and up to 2050 W thanks to the ACST1635-8FP
a 16 A, 800 V high temperature overvoltage protected ACST device. The high power load
control is based on phase angle control. In order to limit the inrush current and possible
current peaks, the demonstration board features a soft-start routine and a smooth power
change function for the high power loads.
The STEVAL-IHT005V2 can also control 4 low power loads up to 100 W thanks to
3 ACS108-8S, 0.8 A, 800 V overvoltage protected ACS devices and a Z0109, 1 A standard
4 quadrant 600 V Triac.
The demonstration board passed the precompliance tests for EMC directives
IEC 61000-4-4 (burst up to 8 kV) and IEC 61000-4-5 (surge up to 2 kV).
When put in standby mode, the STEVAL-IHT005V2 has an overall standby power
consumption below 500 mW at 264 V/50 Hz.
Figure 1. STEVAL-IHT005V2
www.st.com

Contents UM1631
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Contents
1 Board features and objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Board features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Targeted applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Board operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 How to operate the STEVAL-IHT005V2 . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 MCU programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4 Load and gate control fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1 Phase angle control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2 Full wave control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5 Power supply consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1 Max. output current and standby consumption . . . . . . . . . . . . . . . . . . . . 12
5.2 Gate voltage impact on gate current . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.3 Pulsed gate control and average gate current consumption . . . . . . . . . . 13
6 Board immunity performances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1 Hardware and software features to increase immunity . . . . . . . . . . . . . . 14
Software features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.2 Surge tests results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

DocID024503 Rev 1 3/27
UM1631 Contents
6.3 Burst tests results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.3.1 Test procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.3.2 Test results of the board without hardware modifications . . . . . . . . . . . 15
6.3.3 Input filter influence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.3.4 Noise suppressor influence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.3.5 Gate filtering circuit influence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.3.6 Immunity to relay switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Appendix A STEVAL-IHT005V2 schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
A.1 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
A.2 Demonstration board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
A.3 Test point lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
A.4 Gate resistor calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Gate resistor calculation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Assumptions for calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
A.5 Bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Board features and objectives UM1631
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1 Board features and objectives
1.1 Objectives
The board is designed for promotion of a complete solution for home appliance applications
based on STMicroelectronics™ components. Special emphasis is placed on demonstration
of the robust full 3.3 V solution. Robustness is demonstrated on 4 kV level in class A during
IEC-61000-4-4 (burst) test.
This board also allows designers to check AC switches control feasibility with a 3.3 V supply.
Gate currents can be measured and compared to the information given in AN2986.
Promoted parts are
STM32F100C4T6B - value line 32-bit MCU
T1635H-6T - 16 A 600 V 35 mA high temperature Snubberless™ Triac in TO-220
package
ACST1635-8FP - 16 A 800 V high temperature overvoltage protected AC switch in
TO-220 FPAB package
ACS108-8SA - 0.8 A 800 V 10 mA overvoltage protected ACS device in TO-92
package
Z0109MA - 1 A standard 10 mA 4Q Triac in TO-92 package
VIPer16L - an offline converter with 800 V avalanche rugged power section operating
at 60 kHz.
The ACS108 and Z0109 are controlled in ON/OFF mode with the buttons. These devices
control small loads like valves, pumps, and door locks.
The T1635H and ACST16 are controlled in phase control mode with potentiometers. These
devices control high power loads like drum motors or heating resistors.

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UM1631 Board features and objectives
1.2 Board features
The board key features and performances are
Complete solution for -3.3 V control
Input voltage range: 90-265 VAC 50/60 Hz
Negative 6 V/3.3 V VDC auxiliary power supply based on the VIPer16L in buck-boost
topology
Total power consumption in standby mode is lower than 0.5 W for 264 V/50 Hz
48-pin, 32-bit value line family STM32F100C4T6B MCU as main controller
Zero voltage switching (ZVS) interrupt to synchronize MCU events with voltage mains
1x T1635H-6T and 1 x ACST1635-8FP for phase control of high power loads
5 discrete power level states with soft change for phase angle controlled devices
1x Z0109 and 3x ACS108 for full wave control of low power loads
1x relay for demonstration of the board noise robustness
“Red” LED to show that the board is supplied from mains
“Green” LED for each ACS/ACST/Triac to show that the device is turned ON
JTAG programming connector
External wire loop for gate current measurement
I2C bus hardware/software ready
18 test pins
IEC 61000-4-4 precompliance test passed (burst up to 8 kV)
IEC 61000-4-5 precompliance test passed (surge up to 2 kV)
RoHS compliant
1.3 Targeted applications
Targeted applications are mid-end and high-end washing machines, dishwashers, dryers,
and coffee machines.
Optionally, this board targets any home-appliance application where the STM32 MCU
controls any type of Triac/ACST/ACS.
1.4 Operating conditions
The board operates in nominal line voltage 110 V/230 V in both 50/60 Hz power nets.
Line voltage: 90-264 V 50/60 Hz
Operating ambient temperature 0 °C to 60 °C
Nominal loads power (for 230 V voltage)
– ACST1635-8FP - 2050 W
– T1635H-6T - 2830 W
– Z0109MA - 96 W
– ACS108-8SA - 105 W

Safety instructions UM1631
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2 Safety instructions
Warning: The high voltage levels used to operate the STEVAL-IHT005V2
board could present a serious electrical shock hazard. This
demonstration board must be used in a suitable laboratory by
qualified personnel only, familiar with the installation, use,
and maintenance of power electrical systems.
2.1 Intended use
The STEVAL-IHT005V2 demonstration board is a component designed for demonstration
purposes only, and not to be used either for domestic installation or for industrial installation.
The technical data as well as the information concerning the power supply and working
conditions should be taken from the documentation included in the kit and strictly observed.
2.2 Installation
Installation instructions for the STEVAL-IHT005V2 demonstration board must be taken from
the present user manual and strictly observed. The components must be protected against
excessive strain. In particular, no components are to be bent, or isolating distances altered
during transportation, handling or use. No contact must be made with electronic
components and contacts. The STEVAL-IHT005V2 demonstration board contains
electrostatically sensitive components that are prone to damage through improper use.
Electrical components must not be mechanically damaged or destroyed (to avoid potential
risks and health injury).
2.3 Electrical connection
Applicable national accident prevention rules must be followed when working on the mains
power supply. The electrical installation must be completed in accordance with the
appropriate requirements (e.g. cross-sectional areas of conductors, fusing, PE
connections). In particular, the programming device must be disconnected from the board
JTAG connector when the board is plugged into the mains.
2.4 Board operation
A system architecture which supplies power to the demonstration board must be equipped
with additional control and protective devices in accordance with the applicable safety
requirements (e.g. compliance with technical equipment and accident prevention rules).
Note: Do not touch the board after disconnection from the mains power supply, as several parts
and power terminals which contain possibly energized capacitors need to be allowed to
discharge completely.

DocID024503 Rev 1 7/27
UM1631 Getting started
3 Getting started
3.1 Connection diagram
Figure 2 shows an image of the board with proper connection of each application.
Figure 2. Board connector
Note: Connect loads and voltage probes before applying line voltage.
3.2 How to operate the STEVAL-IHT005V2
Line voltage must be connected in position as described in Figure 2. The demonstration
board can be operated with or without the load. Even if no load is connected to the
demonstration board, all signals are present and can be displayed on the oscilloscope.
Red LED D6 signals the board is properly supplied from the mains. It also signals that high
voltage is present on the demonstration board.
It is recommended, although not required, to turn both potentiometers to the OFF position
before powering the demonstration board. The board is ready to operate after passing all
initialization routines, like mains frequency recognition, that take approximately 2 s.
Potentiometer R65 controls T1 (T1635H) and potentiometer R66 controls T2 (ACST16).
Output power level is adjusted by changing the position of the related potentiometer. Power
regulation is divided into 5 steps where position 1 means minimum power and position 5
means maximum power. LED D11 for T1 (T1635H) and LED D12 for T2 (ACST16) signal

Getting started UM1631
8/27 DocID024503 Rev 1
that the gate control signal is applied. If the load (example motor) is running and the LED
lights up, it indicates the MCU properly controls the Triac(s).
Blue, black and white buttons control the 3x ACS108 and Z01 in ON/OFF mode with zero
voltage synchronization. The blue button S1 controls ACS1, black button S2 controls ACS2,
black button S3 controls ACS3 and white button S4 controls T3. The different colors are
used for easy recognition of the controlled device.
ACS2 and ACS3 are controlled with 2 ms gate pulses. This is sufficient for loads with RMS
current approximately in the range of 100 mA - 500 mA. Smaller loads should be controlled
with ACS1, which has continuous gate control.
T3 is controlled with 2 ms pulses and is used for comparison with ACS2 and ACS3 behavior.
LED D10 for T3 (Z01), LED (D7) for ACS1 (ACS108-8S), LED D8 for ACS2 (ACS108-8S)
and LED D9 for ACS3 (ACS108-8S) signals that the gate control signal is applied.
The red button S5 controls relay R1. Relay is controlled in the continuous DC mode. The DC
control starts in zero voltage for control coil.
Note: The coil control in zero voltage does not lead to accurate “Zero Voltage Switching” of the
power contacts.
Button control is used in a two-step control. When the button is first pushed it turns the
related device ON. A second push of the button turns the related device OFF. All devices
controlled by buttons are set in the OFF position after reset.
Figure 3. Overview of the demonstration board operation

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UM1631 Getting started
3.3 MCU programming
Once the demonstration board has the mains cable and load cable correctly connected, it
can be powered on. The STEVAL-IHT005V2 demonstration board goes to wait-for-signal
mode immediately after powering it on.
A JTAG connector for MCU programming is used when software modifications are
necessary.
Warning: Programming device has to be galvanically isolated from
mains when programmed directly on mains.
3.4 Load and gate control fitting
Gate current pulse is generated by the MCU. The length of the pulse is set by software.
Gate current pulse length is important. Its value must be set according to the minimum load
current. The load current has to reach the AC switch latching current value to keep the
device ON after the gate pulse is removed. Latching current (IL) is specified in the AC switch
datasheet - ACS108-8S. It is important to check this point for low power loads when RMS
current is low and it takes a long time to reach the latching current level. When gate current
is removed before the load current reaches latching current, the device may turn off. Refer
to the AN302 application note for further information on latching current.
The maximum value and length of the gate current the board can provide depends on power
supply rating. The power supply used in the demonstration board is able to provide 120 mA
continuously in full range of the operating voltage.

Functional description UM1631
10/27 DocID024503 Rev 1
4 Functional description
Two different types of ACS/Triac control are implemented. Phase angle control and full
wave control. The gate control signal is synchronized with zero voltage crossing signal
(ZVC). The MCU operation is also synchronized with ZVC signal. ZVC signal is sent directly
to the MCU input pin that is set as external interrupt.
4.1 Phase angle control
Control of T1 (T1635H) and T2 (ACST16) is based on phase angle control.
Figure 4. Phase angle control description
Phase angle control is based on changing the firing angle (delay). The firing angle
determines the power that is delivered to the load. The shorter the firing angle (delay), the
higher the power.
Firing angle and gate control pulse are defined by software. Table 1 shows initial setting of
firing angle.
4.2 Full wave control
Control of T3 (Z0109), ACS1, ACS2, and ACS3 (all ACS108-8S) is based on full wave pulse
control.
Table 1. Firing angle delay
Level 1 Level 2 Level 3 Level 4 Level 5
Firing angle (delay) 8.5 ms 6.9 ms 5.2 ms 3.6 ms 2.0 ms
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DQJOH
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DocID024503 Rev 1 11/27
UM1631 Functional description
Figure 5. Full wave control description
Full wave pulse control is based on sending gate control pulse immediately after ZVC
signal. Gate control pulse length is defined by the software.
Refer to Table 2 for default gate current pulse duration for all AC switches. Duration of each
pulse is set separately for 50 Hz and 60 Hz mains.
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Table 2. Initial gate current pulse duration
Device Variable name for 50 Hz mains
Initial gate
pulse
duration
(ms/timer
steps)(1)
Variable name for 60 Hz mains
Initial gate
pulse
duration
(ms/timer
steps)(1)
ACS1 ACS_1_SWITCHTIME_50HZ 10/100 ACS_1_SWITCHTIME_60HZ 8.3/83
ACS2 ACS_2_SWITCHTIME_50HZ 2/20 ACS_2_SWITCHTIME_60HZ 1.6/16
ACS3 ACS_3_SWITCHTIME_50HZ 2/20 ACS_3_SWITCHTIME_60HZ 1.6/16
Z0109 Z0109_SWITCHTIME_50HZ 2/20 Z0109_SWITCHTIME_60HZ 1.6/16
ACST16 ACST16_SWITCHTIME_50HZ 1/10 ACST16_SWITCHTIME_60HZ 0.8/8
T1635H T1635H_SWITCHTIME_50HZ 1/10 T1635H_SWITCHTIME_60HZ 0.8/8
1. The timer step is 100 µs.

Power supply consumption UM1631
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5 Power supply consumption
5.1 Max. output current and standby consumption
Non-isolated SMPS based on the VIPer16 in buck-boost topology is designed to provide
output voltage of -6 V. Maximum output current is 120 mA. -3.3 V voltage supply necessary
to supply MCU consists of linear regulator LM337.
Standby consumption has been measured in full range of the supply voltage. The standby
power consumption fulfills the requirement of maximum total power consumption to be
below 500 mW.
Total power consumption of the board in standby mode at supply voltage of 264 Vrms/50 Hz
was 499 mW (output current 10 mA at output voltage -6 V).
The power supply uses mains voltage for self supply from high voltage current generator.
Standby power consumption can be reduced by using the configuration with VIPer16 supply
made from the low voltage side. Refer to the AN2872 application note and VIPer16
datasheet for further information on power supply design.
5.2 Gate voltage impact on gate current
Gate voltage VGT varies with load current as shown in Figure 4 Figure 6?. This variation is
significant and cannot be neglected mainly for devices that are controlled in DC mode and
with low power supply level such as 3.3 V.
Figure 6. Example of VGT variation with load current in quadrants 2 and 3
(0.2 A RMS) for a Z0103 (Tj= 85 °C, IG0 = 7.5 mA)

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UM1631 Power supply consumption
ACS devices have lower VGT variation with load current than Triacs and that is why they are
more suitable for 3.3 V applications as the gate current variation is lower.
Refer to the AN2986 application note for further details and for gate resistor calculation.
5.3 Pulsed gate control and average gate current consumption
Table 3 gives the initial gate current pulse widths for each AC switch, and the maximum
pulse width that may be programmed to keep the overall consumption below the maximum
capability of the VIPer16 supply.
Current consumption of the MCU and six signal LEDs, when turned ON, was estimated at
25 mA. Total current consumption of the board when all Triacs/AC switches are ON with
maximum gate current pulse is 95 mA (T1 and T2 have 1 ms gate current pulse as
described above).
Table 3. Application current consumption
Device PCB
label
Gate
resistor
[]
IGT
(Tj= 25 °C)
[mA]
IGT
(Tj= 0 °C)
[mA]
Gate current
pulse
duration
[ms]
Maximum
average
current
[mA]
Max. gate
current pulse
duration (DC
mode) [ms]
T1635H-6T T1 30 35 50 1 5 N/A(1)
ACST1635-8FP T2 30 35 50 1 5 N/A(1)
Z0109MA T3 112 10 15 2 3 10
ACS108-8SA ACS1 112 10 15 10 15 10
ACS108-8SA ACS2 112 10 15 2 3 10
ACS108-8SA ACS3 112 10 15 2 3 10
1. Device is controlled in phase angle control, long pulse is not desired.

Board immunity performances UM1631
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6 Board immunity performances
6.1 Hardware and software features to increase immunity
Software features
Software features to improve board immunity are
Filtering procedure for button and potentiometer control
Software watchdog
Hardware features to improve board immunity are
Input varistor
ACS-ACST technology and Transil™ as an option for T1635H-6T
47 nF input X2 capacitor
Noise suppressor circuits are implemented (10 nF X2 capacitor and 75 resistor)
R-C-R filter on gate implemented (RG/2, 10 nF, RG/2)
Layout golden rules for immunity improvement
Power tracks far from signal tracks
VSS map
Noise suppressor and R-C-R gate filter close to AC switches and Triacs
Input MCU pins have implemented filter capacitor 10 nF
Any branch in the VDD map has implemented a capacitor to decrease the VDD variation
6.2 Surge tests results
Standard IEC 61000-4-5 tests were performed with surge level of 2 kV, which is required for
home appliances. Mains voltage used for the tests was 230 Vrms/50 Hz.
The ACST16 device is protected against overvoltage spikes up to 2 kV with implemented
crowbar technology. See the ACST16 datasheet for further details.
ACS devices are protected against overvoltage spikes up to 2 kV with implemented crowbar
technology. See the ACS108-8S datasheet for further details.
The Z01 Triac is protected thanks to the noise suppressor circuit and high impedance of the
load (refer to the AN437 application note for snubber design).
The T1635H is protected with Transil P6KE400CA. This is a different implementation of the
crowbar technology. The purpose here is to propose overvoltage protection with a crowbar
technology. This method presents the advantage of not aging contrary to the varistor
technology.

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UM1631 Board immunity performances
6.3 Burst tests results
6.3.1 Test procedure
Standard IEC 61000-4-4 tests were implemented. The tests were performed at a frequency
of 100 kHz and power supply voltage of 254 Vrms/50 Hz. Parameters of the spikes:
Td= 0.7 ms, Tr= 300 ms. All affected couplings were tested. Spikes were applied against
the plate and related polarity (+/-) and the mains wire is mentioned: L+, L-, N+, N-, LN+,
LN-. The board was tested during OFF state (all AC switches were turned OFF).
Protective earth (PE) wire is not connected on the board which is why the couplings with PE
were not tested.
6.3.2 Test results of the board without hardware modifications
The target voltage level of the board immunity against burst spikes was 4 KV without any
influence on the board performance (class A).
MCU STM32F100C4T6B was not disturbed by the burst spikes up to 6 kV (class A). Burst
spikes up to 8 kV caused the MCU to reset but it recovers without external intervention
(class B). Reset procedure did not influence the immunity of the devices with higher
immunity.
Table 4 shows immunity level of the ACS/Triacs against the burst spikes. The immunity is
defined by voltage level of spurious triggering.
6.3.3 Input filter influence
A 47 nF, X2 capacitor is implemented as the input filter. To achieve 4 kV immunity against
the burst spikes for all the AC switches, it was necessary to add two other X2 capacitors:
100 nF and 220 nF, as each of them influenced a different type of coupling. These two
capacitors are not included on the STEVAL-IHT005V2 board as only Z0109 was below 4 kV
level.
Table 4. Immunity level of ACS/Triacs in class A
STEVAL-IHT005V2 VIN 254 VAC - 50 Hz L+ L- N+ N- LN+ LN-
T1635H (150 W light bulb load) > 8 kV > 8 kV > 8 kV > 8 kV > 8 kV > 8 kV
ACST16 (150 W light bulb load) > 8 kV > 8 kV > 8 kV > 8 kV > 8 kV > 8 kV
Z0109 (75 W light bulb load) 4.5 kV 4.1 kV 3.7 kV 4.6 kV 4.0 kV 3.7 kV
ACS1 (75 W light bulb load) 7.4 kV 6.7 kV > 8 kV 7.1 kV 7.3 kV 7.0 kV
ACS2 (150 W light bulb load) > 8 kV > 8 kV > 8 kV > 8 kV 7.6 kV 7.1 kV
ACS3 (150 W light bulb load) > 8 kV > 8 kV > 8 kV > 8 kV 7.6 kV 7.1 kV

Board immunity performances UM1631
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Note: A. No changes in functionality. The board works properly, no reset occurring.
B. Reset occurs, but the board recovers without external intervention.
C. Application does not recover without external intervention.
Two states were tested. Standby mode, when all devices are OFF, and “ON + level 3" when
all devices are turned ON: the devices controlled in full wave mode (T3, ACS1, ACS2,
ACS3) are ON for the whole period and phase angle controlled devices (T1, T2) are ON at
level 3 (5.2 ms delay after zero voltage crossing signal).
6.3.4 Noise suppressor influence
The noise suppressor circuit that consists of X2 capacitor 10 nF (C2, C12, C14, C19, C21,
C23) and resistor 75 (R13, R19, R28, R43, R51, R60) has significant influence on burst
immunity of the devices, as shown in the tests results below (to compare with Table 5
results).
Table 5. IEC-61000-4-4 results with input filter modification
STEVAL-IHT005V2
VIN 254 VAC - 50 Hz 2 kV 4 kV 6 kV 8 kV
Standby
+ L
ON + level 3 (5.2 ms)
A
A
A
A
B
B
B
B
Standby
+ N
ON + level 3 (5.2 ms)
A
A
A
A
B
B
B
B
Standby
+ L +N
ON + level 3 (5.2 ms)
A
A
A
A
B
B
B
B
Standby
- L
ON + level 3 (5.2 ms)
A
A
A
A
B
B
B
B
Standby
- N
ON + level 3 (5.2 ms)
A
A
A
A
B
B
B
B
Standby
- L +N
ON + level 3 (5.2 ms)
A
A
A
A
B
B
B
B
Table 6. Immunity of the high power devices without RC noise suppressor
STEVAL-IHT005V2
VIN 254 VAC - 50 Hz L+ L- N+ N- LN+ LN-
T1635H (150 W light bulb load) 1.7 kV 1.6 kV 1.9 kV 1.7 kV 2.1 kV 1.7 kV
ACST16 (150 W light bulb load) 4.6 kV 3.5 kV 4.8 kV 3.1 kV 3.3 kV 3.1 kV

DocID024503 Rev 1 17/27
UM1631 Board immunity performances
6.3.5 Gate filtering circuit influence
The gate filtering circuit has an influence mainly on sensitive devices. When the gate
filtering circuit is removed, the immunity of Z01 decreases to 2 kV and immunity of ACS108
is decreased to 4 kV. Gate filtering circuit is not mandatory to pass IEC-61000-4-4 tests for
ACS108.
There is no influence on 35 mA IGT devices, when the gate filtering circuit is removed.
6.3.6 Immunity to relay switching
Relay is connected on the board. The relay cannot be controlled in zero voltage mode.
Switching of the relay produces very high dV/dt, other devices must be immune to this type
of noise. Immunity tests of the devices against relay switching have been performed.
Figure 7 shows turn-off behavior of the relay. (The dV/dt observed during turn-off is
1 kV/µs.) Observed peak voltage during turn-off was +/-1300 V. The dV/dt observed during
turn-on was 4 kV/µs. The load was 1.4 H inductor with serial resistance 12 , (RMS current
0.52 A). The Triacs and ACS/ACST switches were not disturbed by these spikes.
Figure 7. dV/dt behavior during relay turn-off

Board immunity performances UM1631
18/27 DocID024503 Rev 1
Figure 8. dV/dt behavior during turn-on

DocID024503 Rev 1 19/27
UM1631 STEVAL-IHT005V2 schematic
Appendix A STEVAL-IHT005V2 schematic
A.1 Schematic
Figure 9. STEVAL-IHT005V2 schematic
PB5
41
VSS_3
47
PB8
45
PC13
2
PA14
37
PB6
42
PA3 13
PB7
43
VDD_3
48
BOOT0
44
PB9
46
VBAT
1
VSSA
8NRST 7PD1 6
PB10 21
PB2 20
PB1 19
PB0 18
PA7 17
PA6 16
PA4 14
VDDA
9
PA0
10
PA1
11
PA2
12
PC14
3
PC15
4
PD0
5
PA15
38
VDD_2 36
PB14 27 PB13 26
PB3
39
PB12 25
VDD_1
24
VSS_1 23
VSS_2 35
PA13 34 PA12 33 PA11 32 PA10 31
PA9 30 PA8 29
PB15 28
PB11 22
PB4
40
PA5 15
STM32F100CB
VDD
VDD
VDD
GND
GND
GND
GND
100 nF
C6
C7 100 nF
100 nF
C5
R5 D1
1N4007
D2
1N4007
F/450 V F/450 V
CE 2 CE3
VDD
1 mH
L1
Drain
7
Drain
8
S1
FB 4
VDD 2
LIM
3
COMP
5
Viper16L
1 nFC4
N.A.
C3
N/A
R7
N/A
R6
CE1
D4 STTH1R06
D3
STTH1R06
X247 nF/305 V
C11
L
N
1 2 3
J2
Header_3
R1 R2 ZVC signal
R4
R3
100 nF
C1
1 mH L2
-6 V
CE4
ADJ
1
IN
2OUT 3
U2
LM337
CE5
R18 Res R15 Res
N/A
CE6
-3.3 V
0 V
-6 V
VDD VDD
1 2 3
J4
Header_3
10 nF C20
10 nF C22
10 nF C24
Cap
N/A
R9
ACS_1
ACS_2
ACS_3
T1635H ACST1635
Z0109
R57
ACS_3
ACS_2
ACS_
1
X2 10 nF/305 V
C19
R43
X2
10 nF
C23
R60
X2 10 nF/305 V
C21
R51
R12 N/A
R14 Varistor
R13
X2
10 nF/ 305 V
C2
VDD
10 nF C10
T1635H
1 2 3
J3
Header_3
R19
X2 10 nF/
305 V
C12
VDD
10 nF C13
Cap
R17R16
ACST1635
R28
X2
10 nF/ 305 V
C14
VDD
10 nF C16
Z0109
ZVC signal
VDD
C8
10 nF
C9
L3
BC547A
Q2
1
2
N/A
XT1
100 nF
C27
R63
GND
VDD
R55
BUTTON_ACS_1
BUTTON_ACS_2
BUTTON_ACS_3
BUTTON_Z0109
BUTTON_ACS_1 BUTTON_ACS_ 2BUTTON_ACS_
3BUTTON_Z0109
PO
TENTIOMETER_T1635H
POTENTIOMETER_ACST1635
VDD
GND
GND
R34
VDD
10k
R27
R29
R23
-6
V
VDD
1
2
3
4
Relay
-RAS0515
K1
GND NRST
NRST
R21
100 nF C15
GND
VDD
BC557A Q1
relay
relay
I2C_SCL
I2C_SDA
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
CN1 JTAG
PB3 R42
R45 R46
VDD
VDD
PA13
PA13
PA14
PA15
PB4
NRST_JTAG
NRST_JTAG
PA14 PA15
PB4
1 2 3
J1 Header_3
VDD
relay_out
relay_out
R65 RPot
VDD
VDD
GND
GND
POTENTIOMETER_ACST1635
POTENTIOMETER_T1635H
N/A
C17
N/A
C18 N/A
R30
LED_ACS_1
LED_ACS_2
LED_ACS_3
LED_Z0109
VDD
R35 D7
LED
LED_ACS_1
VDD
R37 D8
LED
LED_ACS_2
VDD
R40 D9
LED
LED_ACS_3
VDD
R44 D10
LED
LED_Z0109
VDD
R32 D6
LED -6 V
LED_ACST1635
LED_T1635H
VDD
R47 D11
LED
LED_T1635H
VDD
R52 D12
LED
LED_ACST1635
R41
R50
R59
R33
R26
R11
I2C_SCL
I2C_SDA
D5 1N4007
-6 V
1 2 3 4
P1 Header4
VDD
GND
ON/OFF signal
R58
R48 R49
R38 R39
R25R24
R22 R20
VDDVDD
R8 R10
R66
RPot
12
34
S3 button
100 nF C28
R64
GND
VDD
R56
12
34
S4 button
100 nF C26
R62
GND
VDD
R54
12 34
S2 button
100 nF C25
R61
GND
VDD
R53
12 34
S1 button
OUT
COM
G
ACS1
ACS108
-8S
OUT
COM
G
ACS2
ACS108
-8S
OUT
COM
G
ACS3
ACS108-8S
T3
Z0109
1
ZVC
testpoint
1-6 V
testpoint
1
N_VDD
testpoint
1-3.3 V
testpoint
1VDD
testpoint
1
L
testpoint
1
G_T2
testpoint
1
G_T3
testpoint
1
G_ACS1
testpoint
1
G_ACS2
testpoint
1
G_ACS3
testpoint
1A2_T1
testpoint
1A2_T3
testpoint
1
OUT_ACS1
testpoint
1
OUT_ACS 3
testpoint
1
OUT_ACS 2 testpoint
1
OUT_T2
testpoint
BUTTON_RELA
Y
100 nF C29
R68
GND
VDD
R67
12
34
S5 button
BUTTON_RELAY
PB3
PB3
T2
ACST1635
T1
T1635H
1
2
TR1
P6 KE400CA
R69
R70
GND
1 nF C30
GND
1
G_T1
testpoint
10 nF
C32
GND
10 nF
C33
GND
10 nF
C34
GND
10 nF
C35
GND
10 nF
C36
GND
10 nF C37
GND
10 nF C38
GND
1 nF C31
GND
AM07459V1
/305 V

STEVAL-IHT005V2 schematic UM1631
20/27 DocID024503 Rev 1
A.2 Demonstration board layout
Figure 10. STEVAL-IHT005V2 - top layer
Figure 11. STEVAL-IHT005V2 - bottom layer