Freescale Semiconductor
Advance Information
Document Number: MC33912
Rev. 4.0, 2/2008
LIN System Basis Chip with DC
Motor Pre-driver and Current
Sense
The 33912 is a Serial Peripheral Interface (SPI) -controlled System
Basis Chip (SBC), combining many frequently used functions in an
MCU-based system, plus a Local Interconnect Network (LIN)
transceiver. The 33912 has a 5.0V - 60mA low dropout regulator with
full protection and reporting features. The device provides full SPI-
readable diagnostics and a selectable timing watchdog for detecting
errant operation. The LIN Protocol Specification 2.0 compliant LIN
transceiver has waveshaping circuitry that can be disabled for higher
data rates.
Two 60mA high side switches and two 160mA low side switches
with output protection are available for driving resistive and inductive
loads. All outputs can be pulse-width modulated (PWM). Four high
voltage inputs are available for use in contact monitoring, or as external
wake-up inputs. These inputs can be used as high voltage Analog
Inputs. The voltage on these pins is divided by a selectable ratio and
available via an analog multiplexer.
The 33912 has three main operating modes: Normal (all functions
available), Sleep (V
DD
off, wake-up via LIN, wake-up inputs (L1-L4),
cyclic sense and forced wake-up), and Stop (V
DD
on with limited
current capability, wake-up via CS, LIN bus, wake-up inputs, cyclic
sense, forced wake-up and external reset).
The 33912 is compatible with LIN Protocol Specification 2.0.
Features
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33912
SYSTEM BASIS CHIP WITH LIN
2
ND
GENERATION
AC SUFFIX (Pb-FREE)
98ASH70029A
32-PIN LQFP
ORDERING INFORMATION
Device
Temperature
Range (T
A
)
- 40°C to 125°C
32-LQFP
-40°C to 85°C
Package
Full-duplex SPI interface at frequencies up to 4MHz
LIN transceiver capable of up to 100kbps with wave shaping
MC33912BAC/R2
Two 60mA high side and two 160mA low side protected switches
MC34912BAC/R2
Four high voltage analog/logic Inputs
Configurable window watchdog
5.0V low drop regulator with fault detection and low voltage reset (LVR) circuitry
Current sense module
Switched/protected 5.0V output (used for Hall sensors)
Pb-free packaging designated by suffix code AC
V
BAT
33912
VS1
VS2
VSENSE
HS1
L1
L2
L3
L4
LIN INTERFACE
LIN
VDD
PWMIN
ADOUT0
ADOUT1
MOSI
MISO
SCLK
CS
RXD
TXD
IRQ
RST
LS1
M
MCU
LS2
ISENSEH
ISENSEL
HVDD
HS2
WDCONF
Figure 1. 33912 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2007. All rights reserved.
LGND
PGND
AGND
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
