33903 datasheet(34/104 Pages) FREESCALE

34 / 104 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

33903/4/5

FUNCTIONAL DESCRIPTION

INTRODUCTION

FUNCTIONAL DESCRIPTION

INTRODUCTION

The MC33903_4_5 is the second generation of System

Basis Chip, combining:

- Advanced power management unit for the MCU, the

integrated CAN interface and for the additional ICs such as

sensors, CAN transceiver.

- Built in enhanced high speed CAN interface (ISO11898-

2 and -5), with local and bus failure diagnostic, protection and

fail-safe operation mode.

- Built in LIN interface, compliant to LIN 2.1 and J2602-2

specification, with local and bus failure diagnostic and

protection.

- Innovative hardware configurable fail-safe state machine

solution.

- Multiple LP Modes, with low current consumption.

- Family concept with pin compatibility; with and without

LIN interface devices.

FUNCTIONAL PIN DESCRIPTION

POWER SUPPLY (VSUP/1 AND VSUP2)

Note: VSUP1 and VSUP2 supplies are internally

connected on part number MC33903BDEK and

MC33903BSEK.

VSUP1 is the input pin for the internal supply and the VDD

regulator. VSUP2 is the input pin for the 5 V-CAN regulator,

LIN’s 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 VSUP/1.

Loss of battery is reported through a bit (called BATFAIL).

This generates a POR (Power On Reset).

VDD VOLTAGE REGULATOR (VDD)

The regulator has two main modes of operation (Normal

Mode and LP Mode). It can operate with or without an

external PNP transistor.

In Normal Mode, without external PNP, the max DC

capability is 150 mA. Current limitation, temperature pre-

warning flag and over-temperature shutdown features are

included. When VDD is turned ON, rise time from 0 to 5.0 V is

controlled. Output voltage is 5.0 V. A 3.3 V option is available

via dedicated part number.

If current higher than 150 mA is required, an external PNP

transistor must be connected to VE (PNP emitter) and VB

(PNP base) pins, in order to increase total current capability

and share the power dissipation between internal VDD

transistor and the external transistor. See External Transistor

Q1 (VE and VB). The PNP can be used even if current is less

than 150 mA, depending upon ambient temperature,

maximum supply and thermal resistance. Typically, above

100-200 mA, an external ballast transistor is recommended.

VDD REGULATOR IN LP MODE

When the device is set in LP VDD ON Mode, the VDD

regulator is able to supply the MCU with a DC current below

typically 1.5 mA (LP-ITH). Transient current can also be

supplied up to a tenth of a mA. Current in excess of 1.5 mA

is detected, and this event is managed by the device logic

(Wake-Up detection, timer start for over-current duration

monitoring or watchdog refresh).

EXTERNAL TRANSISTOR Q1 (VE AND VB)

The device has a dedicated circuit to allow usage of an

external “P” type transistor, with the objective to share the

power dissipation between the internal transistor of the VDD

regulator and the external transistor. The recommended

bipolar PNP transistor is MJD42C or BCP52-16.

When the external PNP is connected, the current is shared

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.

The device is able to operate without an external

transistor. In this case, the VE and VB pins must remain

open.

5 V-CAN VOLTAGE REGULATOR FOR CAN AND

ANALOG MUX

This regulator is supplied from the VSUP/2 pin. A capacitor

is required at 5 V-CAN pin. Analog MUX and part of the LIN

interfaces are supplied from 5 V-CAN. Consequently, the

5 V-CAN must be ON in order to have Analog MUX operating

and to have the LIN interface operating in TXD/RXD Mode.

The 5 V-CAN regulator is OFF by default and must be

turned ON by SPI. In Debug Mode, the 5 V-CAN is ON by

default.

V AUXILIARY OUTPUT, 5.0 AND 3.3 V

SELECTABLE (VB-AUX, VC-AUX, AND VCAUX) -

The VAUX block is used to provide an auxiliary voltage

output, 5.0 or 3.3 V, 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.

An over-current and under-voltage detectors are provided.

33903 Datasheet(PDF) 34 Page - Freescale Semiconductor, Inc

33903 Datasheet(HTML) 34 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL