NXP Semiconductors
Data sheet: Technical Data
Document Number: MC33814
Rev. 9.0, 10/2016
Two cylinder small engine control IC
Powered by SMARTMOS technology, the 33814 delivers a cost-optimized IC
solution for managing one and two-cylinder engines. With six drivers, three pre-
drivers, a 5.0 V regulator for the MCU, a protected external sensor supply, and a
high level of integration, the IC offers an ideal response to contemporary market
requirements. The innovative VRS system optimizes noise immunity under
cranking conditions. Diagnostic and protection features present on all outputs allow
applications to operate with greater safety.
Features:
• Operates over supply voltage range of 4.5 V < V
PWR
< 36 V
• Start-up/shut-down control and power sequence logic with KEYSW input
• MCU supply: V
CC
is a 5.0 V (±2.0%, 200 mA) regulated supply
• Sensor supply: V
PROT
(100 mA) is a V
CC
tracking protected sensor supply
• Three configurable pre-drivers for IGBT or general purpose gate MOSFETs for
ignition and O
2
sensor (HEGO) heater:
• PWM
• Overcurrent shutdown
• Short-to-battery shutdown
• Six low-side drivers with full diagnostics, self-protection and PWM control:
• Two fuel injector drivers, R
DS(on)
= 0.6
Ω,
I
LIMIT
= 1.8 A, to drive typical 12
Ω
high-impedance injectors
• Relay 1 driver, R
DS(on)
= 0.4
Ω,
I
LIMIT
= 3.0 A, to drive fuel pump
• Relay 2 driver, R
DS(on)
= 1.5
Ω,
I
LIMIT
= 1.2 A, to drive power relay
• Lamp driver, R
DS(on)
= 1.5
Ω,
I
LIMIT
= 1.2 A, to drive warning lamp or an LED
• Programmable Tachometer Driver, R
DS(on)
= 20
Ω,
I
shutdown
= 60 mA, to drive
a Tachometer display
• Innovative configurable VRS conditioning circuit, with two different parameter
settings for engine cranking and running mode and an optional automatic mode
to improve noise immunity in cranking conditions
• K-line (ISO9141)
• MCU reset generator and programmable watchdog
• MCU Interface: 16-bit SPI and parallel interface with 5.0 V IO capability
.
V
BAT
V
BAT
Keyswitch
33814
TWO CYLINDER SMALL ENGINE
CONTROL IC
98ASA00737D
AE SUFFIX (PB-FREE)
48-PIN LQFP-EP
Applications:
Small Engine Control for:
• Motor scooters
• Small motorcycles
• Lawn mowers
• Lawn trimmers
• Snow blowers
• Chain saws
• Gasoline-driven electrical generators
• Outboard motors
MC33814
KEYSW VPROT ROUT2
VPWR
LAMPOUT
VPPREF
ROUT1
TACHOUT
VPPSENS
O2HFB
O2HOUT
VCC
O2HSENSP
RESETB
O2HSENSN
V
BAT
MIL
5.0 V Sensor Supply
Relay 2
(Power)
Relay 1
(Fuel Pump)
MCU
TACHOMETER
O2 Heater
V
CC
+5.0 V
RESETB
SPI
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
4
SPI
MRX
MTX
BATSW
RIN1
RIN2
IGNIN1
IGNIN2
INJIN1
INJIN2
VRSOUT
O2HIN
VRSP
VRSN
GND
V
BAT
INJOUT1
Injectors
INJOUT2
ISO9141
IGNFB1
IGNOUT1
IGNFB2
IGNOUT2
IGNSENSP
IGNSENSN
ISO9141
V
BAT
V
BAT
Crankshaft VRS
Figure 1. 33814 simplified application diagram
© 2016 NXP B.V.
Table of Contents
1
2
3
Orderable parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Internal block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Pinout diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.2 Pin definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
General product characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.2 Static electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.3 Dynamic electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4 Timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.5 Typical electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
General IC functional description and application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.1 System controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.2 Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.3 System reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.4 Power supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.5 Drivers blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.6 Pre-driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.7 VRS circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
5.8 ISO9141 bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
5.9 Mode code and revision number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
5.10 SPI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
5.11 SPI registers mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Typical applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
6.1 Output OFF open load fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
6.2 Low voltage operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
6.3 Low-side injector driver voltage clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
6.4 Reverse battery protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
7.1 Package mechanical dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
4
5
6
7
8
33814
2
NXP Semiconductors
1
Orderable parts
Part Number
(1)
MC33814AE
Temperature (T
A
)
-40 °C to 125 °C
Package
48 LQFP-EP
Table 1. Orderable part variations
Notes
1. To order parts in Tape and Reel, add the R2 suffix to the part number.
33814
NXP Semiconductors
3
2
Internal block diagram
VPWR
VPPREF
VPPSENS
V
CC
V
CC
LOGIC CONTROL
Pre-
Regulator
POR,
Overvoltage
Undervoltage
V
PP
+5.0 V
Tracking
Regulator
+5.0 V
Regulator
RESETB
VPROT
VCC
CSB
SI
SCLK
SO
O2HIN
INJIN1
Watchdog
SPI INTERFACE
and REGISTERS
Typical of all 6 Driver Outputs
INJOUT1
INJOUT2
Gate Control
Current Limit
Temperature Limit
Short/Open
(1 of 6 shown)
PARALLEL
CONTROL
SPI Control
Parallel Control
V
PWR
VClamp
75 µA
ROUT1
ROUT2
INJIN2
IGNIN1
lLimit
+
–
R
S
LAMPOUT
TACHOUT
INJGND1
INJGND2
RGND1
RGND2
IGNIN2
RIN1
RIN2
MRX
V
CC
VAnalog
V10.0 Analog
V2.5 Logic
V
Logic
ISO9141
ISO9141
Bandgap
SLEEP/RUN
MTX
KEYSW
CONTROLLER
Bias
Pre-drivers
Ignition 1
START LOGIC
BATSW
To ROUT2
Driver
IGNFB1
IGNOUT1
IGNFB2
IGNOUT2
IGNSENSP
IGNSENSN
O2HFB
O2HOUT
O2HSENSP
O2HSENSN
Ignition 2
Oscillator
To Logic
Control
lLimit
+
–
O2 Heater
Divider
VCC
(SPI CONTROL)
To Logic
Control
lLimit
+
–
33814
4
–
+
VRSP
VRSN
Divide by “N”
N=1-32
(SPI)
VRS CIRCUIT
To TACHOUT Driver
VRSOUT
Note: All current sinks and sources ~50µA
except where indicated
GND
Figure 2. Simplified internal block diagram
NXP Semiconductors
3
3.1
Pin connections
Pinout diagram
IGNOUT2
IGNFB2
IGNOUT1
IGNFB1
ISO9141
INJOUT1
INJGND1
ROUT1
RGND1
INJOUT2
INJGND2
KEYSW
48
47
46
45
44
43
42
41
40
39
38
37
Transparent Top View
13
14
15
16
17
18
19
20
21
22
23
Figure 3. 33814 Pin connections
3.2
Pin definitions
Table 2. 33814 pin definitions
Pin
1
2
Pin Name
O2HFB
O2HOUT
Pin
Function
Input
Output
Formal Name
O2 Sensor Heater
Feedback Input
O2 Sensor Heater
Output
Description
Voltage feedback from drain of O2 Sensor Heater driver FET. If used as IGBT driver,
voltage feedback from collector of IGBT through 10:1 voltage divider (9R:1R).
Pre-driver output for O2 Sensor Heater driven by SPI input or O2HIN pin
3
IGNSENSP
Input
Positive input to the ignition current sense differential amplifier.
Ignition Current
Sense Input Positive Measures current in IGBT emitter resistor (or MOSFET source resistor) for IGNOUT1
and IGNOUT2, if used
Negative input to the ignition current sense differential amplifier.
Ignition Current
Sense Input Negative Measures current in IGBT emitter resistor (or MOSFET source resistor) for IGNOUT1
and IGNOUT2, if used
Negative input to the O2 heater current sense differential amplifier.
O2 Heater Current
Sense Input Negative Measures current in of O2 heater driver MOSFET source resistor (or IGBT emitter
resistor), if used
Positive input to the O2 heater current sense differential amplifier.
O2 Heater Current
Sense Input Positive Measures current in of O2 heater driver MOSFET source resistor (or MOSFET source
resistor) for IGNOUT1 and IGNOUT2, if used
VRS Conditioned
Output
5.0 V Logic Level Output from conditioned VRS differential inputs VRSP, VRSN
4
IGNSENSN
Input
5
O2HSENSN
Input
6
O2HSENSP
Input
7
VRSOUT
Output
SI
VPPREF
GND
SO
VCC
VPPSENS
RESETB
VPROT
LAMPOUT
RGND2
ROUT2
NC
24
O2HFB
O2HOUT
IGNSENSP
IGNSENSN
O2HSENSN
O2HSENSP
VRSOUT
VRSP
VRSN
CSB
VPWR
SCLK
1
2
3
4
5
6
7
8
9
36
35
34
33
32
31
30
29
28
27
26
25
EP
10
11
12
RIN1
RIN2
O2HIN
IGNIN1
IGNIN2
INJIN1
INJIN2
BATSW
MTX
MRX
TACHOUT
NC
33814
NXP Semiconductors
5
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