IFX 1054G Infineon Technologies, IFX 1054G Datasheet - Page 8

• Manufacturer Part Number: IFX 1054G
• Manufacturer: Infineon Technologies

Specifications of IFX 1054G

• Packages: PG-DSO-14
• Transmission Ratemax: 125.0 kbit/s
• Bus Wake-up Capability: Yes
• Additional Features: INH, NERR, NSTB, ENT, WK, RTL, RTH
• Wake-up Inputs: Bus wake-up + wake-up pin
• Standards: ISO11898-3

4
In addition to the Normal operation mode, the IFX1054G offers a Receive - Only mode as well as two Low - Power
operation modes to save power during periods that do not require communication on the CAN bus: Sleep mode,
V
are selected by the microcontroller. In the Low - Power modes neither receiving nor transmitting of messages is
possible.
In Sleep operation mode the lowest power consumption is achieved. In order to minimize the overall current
consumption of the ECU (electronic control unit) the external voltage regulator (5 V supply) is deactivated by the
INH output in this mode, when connected. For that purpose the INH output is switched to high impedance. In
parallel the CANL line is pulled - up to the battery supply voltage via the RTL output and the pull - up paths at the
input pins TxD and RxD are disabled from the internal supply.
To enter the Sleep operation mode the transition mode “Go - to - Sleep” has to be selected
minimum time
IFX1054G will automatically fall in Sleep mode because of the not powered microcontroller.
On a Wake - Up request either by bus line activities or via the WK input, the transceiver is automatically set in
Stand - By mode. Now the voltage regulator (5 V supply) is enabled by the INH output. The WK input reacts to
both, transition from high to low voltage level as well as the other way round. To avoid faulty Wake - Up’s due to
transients on the bus lines or the WK input circuitry respectively, a certain filter time is implemented. As soon as
V
Upon this the microcontroller can activate the Normal operation mode by setting the control inputs NSTB and ENT
high.
The
will remain active. Wake - Up requests via the WK pin or the bus lines are immediately reported to the
microcontroller by setting RxD and NERR low. A power - on condition (
the IFX1054G to
In the Receive - Only mode data on the CAN-bus is transferred to the RxD output, but both output stages, CANH
as well as CANL are disabled. This means that data at the TxD input is not transmitted to the CAN bus. This mode
is useful in combination to a dedicated network - management software that allows separate diagnosis for all
nodes.
A Wake - Up request in the Receive - Only mode is only reported at the RxD-output. The NERR output in this
mode is used to indicate a battery fail condition. When entering the Normal mode the
NERR output becomes high again. This feature is useful e.g. when changing the ECU and therefore a presetting
routine of the microcontroller has to be started.
If either of the supply voltages drops below the specified limits, the transceiver is automatically switched to
Stand - By mode or power - down mode respectively.
Data Sheet
BAT
CC
is provided, the Wake - Up request is monitored on both, the NERR and RxD outputs, by setting them low.
V
Stand - By mode (see
BAT
Stand - By mode corresponds to the Sleep mode, but a voltage regulator connected to the INH output
Operation Modes, Wake - Up
t
h(min)
V
BAT
. After the minimum hold time
Stand - By mode.
Table 1
and
Figure
2). Via the control input pins NSTB and ENT the operation modes
t
h(min)
8
the Sleep mode can be actively selected. Otherwise the
V
BAT
pin is supplied) automatically switches
Operation Modes, Wake - Up
V
BAT
Rev. 1.0, 2009-05-12
-flag is reset and the
(Figure
IFX1054G
2) for a
V
V
BAT
BAT