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new products
New-Tech Magazine l 67
to Meet Strict Environmental
Regulations
Renesas Electronics Corporation
(TSE: 6723), a premier supplier of
advanced semiconductor solutions,
today announced the 32-bit RH850/
E1M-S2 microcontrollers (MCUs)
for automotive powertrain control
applications, such as engine or
transmission control, that provide
high performance and advanced
functionality to enable improved
fuel efficiency. The RH850/
E1M-S2 MCUs include four product
versions, including the most high-
end R7F701216EABA (BGA304,
320MHz).
In recent years, regulations
covering automobile fuel efficiency
and CO2 emissions have become
increasingly strict. Some current
regulations(Note 1) stipulate that
CO2 emissions must be reduced by
10 percent from their current level by
2018. To meet these targets, engine
control systems must optimize the
ignition and fuel injection timing
to match a variety of conditions,
such as current combustion and
driving
status.
Transmission
control systems, for their part, must
instantly select the optimal gear
ratio to match the driving conditions,
which change moment by moment,
in order to minimize power loss in
the transmission.
The new RH850/E1M-S2 MCUs
bring more precise control to
powertrain control systems by
boosting processing performance
to accommodate the increasing
number of calculations required. At
the same time, the RH850/E1M-S2
MCUs boost network performance
to match the larger volume of
control data resulting from the
use of more sensors and provides
stronger security functionality to
prevent unauthorized access to
control systems.
Key features of the new RH850/
E1M-S2:
(1) Newly developed high-
performance G3MH CPU core to
help boost fuel efficiency
The RH850/E1M-S2 MCUs are built
around Renesas’ new and improved
G3MH CPU core. The G3MH core
has improved access latency
towards memory and peripheral
functions while retaining an industry-
leading operating frequency of
320 MHz at Tj (Note 2) = 150°C.
This results in an improved engine
control system responsiveness of
approximately 30 percent (Note
3) compared with earlier Renesas
products.
(2) High-speed network functionality
to accommodate the use of more
sensors and communication with
other vehicle control units
The
RH850/E1M-S2
MCUs
support the Single Edge Nibble
Transmission (SENT, Note 4)
digital communication standard for
sensors and CANFD (Note 5), which
accommodates the increase in the
volume of data from the increasing
number of sensors and the need for
high-speed data transfer to other
vehicle control units respectively.
a) Support for SENT communication
standard for sensor data
The number of sensors used in
automobiles to provide information
on the vehicle or environment status
is growing rapidly, and these sensors
are becoming more sophisticated.
The new RH850/E1M-S2 MCUs are
equipped with six Renesas SENT
(RSENT) channels compliant with
the SENT communication standard
for sensor data. This enables the
MCUs to handle communication of
digitized data from approximately 50
sensors. Since a single signal line
can be used for multiple sensors,
it can contribute to overall weight
reduction of the wiring harnesses
as well.
b) Support for CAN FD high-speed
communication
Intended as a next-generation
automotive CAN communication
standard, the CAN FD accelerates
the maximum throughput. It
also supports a mode allowing
connection to CAN buses using the
earlier standard.
(3) Enhanced security functionality