Renesas RL78/G11 User manual

USER'S MANUAL
R01AN3905EC0101 Rev.1.01 Page 1 of 19
Oct. 08, 2018
RL78/G11
High-end Gas Cooker
Introduction
This user's manual describes a Renesas ultra-low-power microcontroller RL78/G11 application for a high-end gas stove,
through the internal timer array unit, buzzer output control circuit, A/D converter and other functions.
Target Device
RL78/G11
R01AN3905EC0101
Rev.1.01
Oct.
08, 2018

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 2 of 19
Oct. 08, 2018
Contents
1. Outline of System Function...........................................................................................3
1.1 Introduction of High-end Gas Cooker.......................................................................................3
1.2 Introduction of Control System................................................................................................. 3
1.3 Introduction of Operation...........................................................................................................4
2. Introduction of Hardware...............................................................................................5
2.1 Introduction of PCB .................................................................................................................... 5
2.2 Hardware Block Diagram............................................................................................................6
2.3Main MCU..................................................................................................................................... 7
2.4 Power Supply Circuit.................................................................................................................. 8
2.5 High Voltage Pulse Ignition Circuit........................................................................................... 8
2.6 Micro Switch Circuit....................................................................................................................9
2.7 Flame Temperature Detection Circuit.......................................................................................9
2.8 Gas Detection Circuit................................................................................................................10
2.9Anti-dry Protection Circuit.......................................................................................................10
2.10 Electromagnetic Valve Control Circuit ...................................................................................11
2.11 Buzzer Output Controller Circuit.............................................................................................11
3. Schematic, PCB and Bill of Materials .........................................................................12
3.1 Schematic ..................................................................................................................................12
3.2 PCB............................................................................................................................................. 14
3.3 Bill of Materials..........................................................................................................................15
4. Introduction of Software..............................................................................................17
4.1 Integrated Development Environment....................................................................................17
4.2 List of Option Byte Setting.......................................................................................................17
4.3 Flow Chart..................................................................................................................................18
4.3.1 Flow Chart of Firmware Main Program.............................................................................18
5. Sample Code ................................................................................................................19
6. Reference Documents..................................................................................................19

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 3 of 19
Oct. 08, 2018
1. Outline of System Function
1.1 Introduction of High-end Gas Cooker
Nowadays, gas cooker has been popularized in every household, and this also has a high demand on the control and
safety of gas stove. The introduction of the high-end gas stove in this user's manual is optimized for handling and
safety.
The high-end gas stove uses a 9V battery as power supply. Lightly press the micro switch to start the ignition. The high
voltage pulse ignition allows faster gas ignition, and the gas detecting device can effectively alarm to avoid gas leakage
and improve the safety; the flame temperature detection (thermocouple temperature feedback) can get the flame
temperature in real time to avoid flameout; the anti-dry protection device can avoid occurrence of danger and waste of
gas effectively.
1.2 Introduction of Control System
The high-end gas cooker consists of micro switch, high voltage pulse ignition, gas detection, anti-dry protection, flame
temperature detection (thermocouple temperature feedback), alarm and electronic circuit with RL78/G11 MCU as its
core. For schematic diagram of control system, see Figure 1.1.
RL78/G11
Micro Switch
Flame
thermocouple
detection
High voltage
pulse ignition
Electromagnetic
valve
Anti-dry
protection
Gas detection
Power
Alarm
Figure 1.1 Schematic Diagram of Control System

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 4 of 19
Oct. 08, 2018
1.3 Introduction of Operation
(1) The gas detection timer starts automatically after the power is turned on.
(2) When time (10 ms) is up, it begins to detect gas concentration, and if the concentration is too high, the buzzer will
sound.
(3) When it is not in burning state, if micro switch is pressed, it will start ignition process (4); otherwise, it returns to (2);
But when it is in burning state, micro switch signals would be blocked, and it enters (5).
(4) The electromagnetic valve is opened and the high voltage pulse ignition starts. Then the flame temperature is
detected, and if the flame temperature is too low, that means ignition failure, then the ignition failure process starts,
otherwise, it enters (5).
(5) The flame temperature is detected. If the flame temperature is too low, it can prevent accidental flameout, that is, the
electromagnetic valve will be closed and the alarm sounds.
(6) The temperature of the pot bottom is detected. If the temperature is too high, it will start the anti-dry protection, that
is, the electromagnetic valve will be closed and the anti-dry protection alarm sounds.
(7) Repeat (2) ~ (6).

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 5 of 19
Oct. 08, 2018
2. Introduction of Hardware
2.1 Introduction of PCB
The demo board of the high-end gas cooker is shown in Figure 2.1.
Figure 2.1 Demo Board of High-end Gas Cooker
Gas
detection
E1 emulator
interface
RL78/G11
Anti-dry
protection
Alarm
Micro switch
Extern
power
Electromagnetic
valve control
Ignition
feedback
High voltage
pulse ignition

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 6 of 19
Oct. 08, 2018
2.2 Hardware Block Diagram
The hardware block diagram of the high-end gas cooker lighting is shown in Figure 2.2.
P55
LDO V
DD
Powersupply
5V
RL78/G11
(20Pin)
Lift
ANI17
ANI16
On-Chip Debug
TOOL0
Lift
Right
Alarm control
P30
Left micro switch
P121
Gas detection
P137
9V Battery
P56
Right
Ignition control
Anti-dry
protection
ANI3
ANI2
Lift
Right
Flame
temperature
detection
P122
Right micro
switch
P31
P32
Electromagnetic
valve control
P22
P23
Figure 2.2 High-end Gas Cooker Hardware Block Diagram

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 7 of 19
Oct. 08, 2018
2.3 Main MCU
The demo board of the high-end gas cooker uses RL78/G11 (R5F1056AASP main MCU. The Flash ROM size of
RL78/G11 is 16 KB and the RAM size is 1.5 KB. The used peripheral functions of RL78/G11 and their applications are
shown in Table 2.1.
Table 2.1 The Used Peripheral Functions and Their Applications
Peripheral functions
Usage
TAU
10ms timer, plus oscillation
Buzzer output controller
Alarm controller
ANI16, ANI17
Anti-dry protection
ANI0, ANI1
Flame temperature detection
P22, P23
Electromagnetic valve control
P122, P121, P31, P33
Micro switch
P54
Oscillation circuit control
P55, P56
Ignition control
P137
Gas detection
The interface control circuit of RL78/G11 is shown in Figure 2.3.
Figure 2.3 Interface Control Circuit of RL78/G11

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 8 of 19
Oct. 08, 2018
2.4 Power Supply Circuit
The power section needs to connect with external 9V DC, then gets stable 5V for power supply through ME6209A50.
The power supply circuit is shown in Figure 2.4.
Figure 2.4 Power Supply Circuit
2.5 High Voltage Pulse Ignition Circuit
The high voltage pulse ignition circuit is composed of an oscillating circuit and a high-voltage circuit.
The high voltage pulse ignition circuit is shown in Figure 2.5.
Figure 2.5 High Voltage Pulse Ignition Circuit

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 9 of 19
Oct. 08, 2018
2.6 Micro Switch Circuit
The high voltage pulse ignition starts/stops according to the pin status of the micro switch.
The micro switch circuit is shown in Figure 2.6.
Figure 2.6 Micro Switch Circuit
2.7 Flame Temperature Detection Circuit
After the high voltage pulse ignition begins, it starts to detect the voltage signal of thermocouple feedback. Then it will
judge whether the ignition is successful by voltage signal. If the ignition is successful, it will continue to detect flame
temperature; but if the ignition fails, the alarm will be turned on to alert people.
The flame temperature detection circuit is shown in Figure 2.7.
Figure 2.7 Flame Temperature Detection Circuit

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 10 of 19
Oct. 08, 2018
2.8 Gas Detection Circuit
The high-end gas cooker's gas detection circuit is composed of a MQ-4 gas detection sensor and a LM393B voltage
comparator. When the concentration of natural gas exceeds the standard, the DOUT pin outputs a low level, at the same
time the LED1 (alarm lamp) lights up, then it will disable ignition and close the electromagnetic valve and give an
alarm tone.
The gas detection circuit is shown in Figure 2.8.
Figure 2.8 Gas Detection Circuit
2.9 Anti-dry Protection Circuit
The high-end gas stove uses a thermal resistance temperature sensor as anti-dry protection device. The outer layer of the
sensor is a heat insulation layer, so that the flame temperature interference can be avoided; the top is a temperature
measuring layer which can cling to the bottom of the pot when the pot is put on the stove, so as to detect the pot
temperature in real time and judge whether the pot is in boil-dry state. If the pot is in boil-dry state, gas supply will be
stopped and the alarm buzzer will sound.
The anti-dry protection circuit is shown in Figure 2.9.
Figure 2.9 Anti-dry Protection Circuit

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 11 of 19
Oct. 08, 2018
2.10 Electromagnetic Valve Control Circuit
The high-end gas cooker will start the ignition after receiving the switch response. At this time, the gas control valve
will be opened.
The electromagnetic valve control circuit is shown in Figure 2.10.
Figure 2.10 Electromagnetic Valve Control Circuit
2.11 Buzzer Output Controller Circuit
The high-end gas cooker has alarm function. If ignition failure lasts for a long time, gas leakage or boil-dry will occur
and the buzzer will sound.
The buzzer output controller circuit is shown in Figure 2.11.
Figure 2.11 Buzzer Output Controller Circuit

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 12 of 19
Oct. 08, 2018
3. Schematic, PCB and Bill of Materials
3.1 Schematic
The schematics of the high-end gas stove are shown in Figure 3.1 and Figure 3.2.
Figure 3.1 Schematic (1/2)

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 13 of 19
Oct. 08, 2018
Figure 3.2 Schematic (2/2)

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 14 of 19
Oct. 08, 2018
3.2 PCB
The PCB of the high-end gas stove lighting is shown in Figure 3.3.
Figure 3.3 PCB

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 15 of 19
Oct. 08, 2018
3.3 Bill of Materials
The bill of materials of the high-end gas stove is shown in Table 3.1 and Table 3.2.
Table 3.1 Bill of Materials
Designator
Quantity
Part Name
Manufacturer
Description
VR1
1
―
―
Adjustable resistance (10K)
C1, C7, C8
1
GRM21BR71E104KA01L
Murata
Capacitor (0.1uF, 16VDC, ±10%, 0805)
C2
1
GRM188R71C474KA88D
Murata
Capacitor (0.47uF,16VDC, ±10%, 0805)
C3, C4, C28
2
GRM21BR71A105KA01L
Murata
Capacitor (1uF,10VDC, ±10%, 0805)
C10, C11, C13, C14
4
GCM188R71H223KA37J
Murata
Capacitor (0.022uF, 50VDC, ±10%, 0603)
C12, C15
2
GRM216R71H103KA01J
Murata
Capacitor (0.01uF, 50VDC, ±10%, 0805)
C27
1
GRM188R61A106KE69D
Murata
Capacitor (10uF, 10VDC, ±10%, 0603)
C40
1
GRM216R71H152KA01D
Murata
Capacitor (0.001uF, 50VDC, ±10%, 0603)
C9 CBB22
1
CBB22 400V682
―
Capacitor (680000P,400VDC)
CBB1, CBB2
2
104k 400
―
Capacitor (0.1uF,400VDC)
CH1, CH2
2
―
―
High pressure bag (28UH,400UH)
D1, D2, D3, D4, D5, D6,
D7, D8, D9, Z1, Z2, Z3,
Z4 13 1N4007 TOSHIBA General Rectifier 50V 1A SMA/DO-214AC
E1
1
2514-6002
3M Limited
Header 7x2, 14-Pin, 2.54mm
JMP1, JMP2
1
146850
TE Connectivity
CON 3X1, 2.54mm
JMP3, JMP4
2
146850
TE Connectivity
CON 2X1, 2.54mm
L1, L2
2
―
―
Magnetic beads
LED1
1
XZMDK54W-1
SunLED
Action LED (green, 0805)
LED2
1
XZMG54W-1
SunLED
Action LED (green, 0805)
Q1, Q2, Q3, Q4, Q5 5 MMSS8050
Micro
Commercial Co TRANS NPN 25V 1.5A SOT-23
Q6 1 MMSS8550
Micro
Commercial Co TRANS PNP 25V 1.5A SOT-23
R1, R2
2
ERJ6ENF3831V
Panasonic
Resistor (3.8KΩ, ±1% 0805)
R3, R5
2
ERJ6GEYJ202V
Panasonic
Resistor (2KΩ, ±5% 0805)
R4, R7, R16, R18, R21,
R23, R30, R31, R42 9 ERJ6GEYJ103V Panasonic Resistor (10KΩ, ±5% 0805)
R6
1
ERJ6GEYJ392V
Panasonic
Resistor (3.9KΩ, ±5% 0805)
R8, R12, R43, R45, R46,
R55 6 ERJ6GEYJ102V Panasonic Resistor (1KΩ, ±5% 0805)
R9, R11
2
ERJ6GEYJ912V
Panasonic
Resistor (9.1KΩ, ±1% 0805)
R10, R13
1
ERJ6GEYJ122V
Panasonic
Resistor (1.2KΩ, ±1% 0805)
R14
1
ERJ6GEYJ154V
Panasonic
Resistor (15MΩ, ±5% 0805)
R15, R53
2
ERJ6GEYJ511V
Panasonic
Resistor (510Ω, ±5% 0603)
R17, R19, R20, R22,
R24, R25 6
ERJ6GEYJ204V
Panasonic Resistor (20MΩ, ±5% 0805)
R32, R33
2
ERJ6GEYJ203V
Panasonic
Resistor (20KΩ, ±5% 0805)
R40
1
ERJ6GEYJ5R1V
Panasonic
Resistor (5.1Ω, ±5% 0805)
R41, R54
2
ERJ6GEYJ101V
Panasonic
Resistor (100Ω, ±5% 0805)
R44
1
ERJ6GEYJ471V
Panasonic
Resistor (470Ω, ±5% 0805)
SCR1, SCR2 2 X0605 ST
SCR(VDRM>600V, VGT=0.8V,
IGT<20mA)

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 16 of 19
Oct. 08, 2018
Table 3.2 Bill of Materials
Designator
Quantity
Part Name
Manufacturer
Description
SP1
1
AT-1224-TWT-5V-2-R
PUI Audio,Inc.
AUDIO MAGNETIC XDCR 3-7V TH
SW2
1
1825910-6
TE Connectivity
Push Switch (6x6mm DIP)
U1
1
R5F1056AASP
Renesas
MCU RL78/G11 20PIN (LSSOP-20)
U2
1
ME6209
Micro One
Low Power Consumption LDO
U4
1
EE13
―
Transformer
U7 1 MQ-4
SparkFun
Electronics Gas Detection
U8
1
LM393 B
TI
Dual voltage comparator
Z5
1
―
―
Zener diode(10V)

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 17 of 19
Oct. 08, 2018
4. Introduction of Software
4.1 Integrated Development Environment
The integrated development environments of the high-end gas stove are shown in Table 4.1 and Table 4.2.
Table 4.1 Integrated Development Environments (CS+ for CC)
Item
Contents
Integrated development environment
CS+ for CC V5.00.00 (Renesas Electronics Corporation)
C complier
CC-RL V1.04 (Renesas Electronics Corporation)
Debugger
E1 (Renesas Electronics Corporation)
Table 4.2 Integrated Development Environments (e2studio)
Item
Contents
Integrated development environment
e2studio V5.2.0.020 (Renesas Electronics Corporation)
C complier
CC-RL V1.04 (Renesas Electronics Corporation)
Debugger
E1 (Renesas Electronics Corporation)
4.2 List of Option Byte Setting
The option byte setting of the high-end gas stove is shown in Table 4.3.
Table 4.3 Option Byte Setting
Address
Setting
Description
000C0H/010C0H
11101110B
Watchdog timer operation is stopped (count is stopped after reset)
000C1H/010C1H
11111111B
LVD: closed
000C2H/010C2H
11100000B
HOCO: 24 MHz, operation voltage range: 4.0 V~5.5 V
000C3H/010C3H
10000100B
On-chip debugging is enabled.

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 18 of 19
Oct. 08, 2018
4.3 Flow Chart
4.3.1 Flow Chart of Firmware Main Program
The flow chart of firmware main program is shown in Figure 4.1.
Start
Time out?
Gas leakage alarm
processing
Disable interrupt
Hrdware Initialization
Gas leakage?Get micro switch status
Pulse ignition process
Flame temperature
detection process
Boil-dry detection
process
No
Yes
Yes
No
Start interval timer:
10ms
Figure 4.1 Flow Chart of Firmware Main Program

RL78/G11 High-end Gas Cooker
R01AN3905EC0101 Rev.1.01 Page 19 of 19
Oct. 08, 2018
5. Sample Code
The sample code is available on the Renesas Electronics Website.
6. Reference Documents
User's Manual
RL78/G11 User's Manual: Hardware (R01UH0637E)
RL78 Family User's Manual: Software (R01US0015E)
The latest versions of the documents are available on the Renesas Electronics Website.
Technical Updates/Technical News
The latest information can be downloaded from the Renesas Electronics website.
Website and Support
Renesas Electronics Website
http://www.renesas.com/
Inquiries
http://www.renesas.com/contact/
All trademarks and registered trademarks are the property of their respective owners.

A-1
Revision History
Rev.
Date
Description
Page
Summary
1.00
Sep. 15, 2017
-
First edition issued
1.01
Oct. 08, 2018
7, 16
Change MCU name from R5F1056A to R5F1056AASP