mc33905s Freescale Semiconductor, Inc, mc33905s Datasheet - Page 28

• Manufacturer Part Number: mc33905s
• Description: System Basis Chip Gen2 With High Speed Can And Lin Interface
• Manufacturer: Freescale Semiconductor, Inc

Basis Chip, combining:
integrated CAN interface and for additional ICs such as
sensors, CAN transceiver.
2 and -5), with local and bus failure diagnostic, protection and
fail safe operation mode.
POWER SUPPLY (VSUP1 AND VSUP2)
and the VDD regulator. VSUP2 is the input pin for the 5V-
CAN regulator, LINs interfaces and I/O functions. The VSUP
block includes over and under-voltage detections which can
generate interrupt. The device includes a loss of battery
detector connected to VSUP1.
This generates a POR (Power On Reset).
VDD VOLTAGE REGULATOR (VDD)
Mode and Low Power Mode). It can operate with or without
an external PNP transistor.
capability is 150mA. Current limitation, temperature pre
warning flag and over temperature shutdown features are
included. When VDD is turned ON, rise time from 0 to 5.0V is
controlled. Output voltage is 5.0V. A 3.3V option is available
via dedicated part number.
transistor must be connected to VEM (PNP emitter) and VB
(PNP base) terminals, in order to increase total current
capability and share the power dissipation between internal
VDD transistor and the external transistor. See
Transistor Q1 (VE and
current is less than 150mA, depending upon ambient
temperature, maximum supply and thermal resistance.
Typically, above 100-200mA, an external ballast transistor is
recommended.
VDD REGULATOR IN LOW POWER MODE
VDD regulator is able to supply the MCU with a DC current
below typ 1.5mA (
supplied up to tenth of mA. Current in excess of 1.5mA is
detected, and this event is managed by the device logic
(wake-up detection, timer start for over current duration
monitoring or watchdog refresh).
28
33904/5
FUNCTIONAL DESCRIPTION
INTRODUCTION
The MC33904_5 is the second generation of System
- Advanced power management unit for the MCU, the
- Built in enhanced high speed CAN interface (ISO11898-
VSUP1 pin is the input pin for the device internal supply
Loss of battery is reported through a bit (called BATFAIL).
The regulator has two main modes of operation (Normal
In Normal Mode, without external PNP, the max DC
If current higher than 150mA is required, an external PNP
When the device is set in Low Power V
L
P-ITH
VB). The PNP can be used even if
). Transient current can also be
DD
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
ON Mode, the
External
INTRODUCTION
specification, with local and bus failure diagnostic and
protection.
machine solution.
with pin compatibility.
EXTERNAL TRANSISTOR Q1 (VE AND VB)
external P type transistor, with the objective to share the
power dissipation between the internal transistor of the V
regulator and the external transistor. The bipolar PNP
recommended transistor are MJD42C or BCP52-16.
between the internal path transistor and the external PNP,
with the following typical ratio: 1/3 in the internal transistor
and 2/3 in the external PNP. The PNP activation and control
is done by SPI.
transistor. In this case the V
open.
VOLTAGE REGULATOR FOR CAN INTERFACE
SUPPLY (5V-CAN)
is required at 5V-CAN terminal. Analog MUX and part of the
LIN interfaces are supplied from 5V-CAN.
by SPI. In Debug mode 5V-CAN is ON be default.
V AUXILIARY OUTPUT, 5V AND 3.3V SELECTABLE
(VB-AUX, VC-AUX, AND VCAUX) - Q2
output, 5 or 3.3V, selectable by the SPI. It uses an external
PNP pass transistor for flexibility and power dissipation
constraints. The external recommended bipolar transistors
are MJD42C or BCP52-16.
OFF. V
information will disable Vaux, and flags are reported in the
SPI and can generate INT.
- Built in LIN interface, compliant to LIN 2.1 and J2602-2
- Innovative and hardware configurable fail safe state
- Multiple low power modes, with low current consumption.
- Family concept; with and without LIN interface devices
The device has a dedicated circuit to allow usage of an
When the external PNP is connected, the current is shared
The device is able to operate without an external
This regulator is supplied from the VSUP2 pin. A capacitor
5V-CAN regulator is OFF by default and must be turn ON
The VAUX block is used to provide an auxiliary voltage
An over-current and under voltage detectors are provided.
V
Vaux is OFF by default and must be turned ON by SPI.
AUX
AUX
is controlled via the SPI, and can be turned ON or
low threshold detection and over-current
Analog Integrated Circuit Device Data
EM
and VB pins must remain
Freescale Semiconductor
DD