aduc7030 Analog Devices, Inc., aduc7030 Datasheet - Page 132

• Manufacturer Part Number: aduc7030
• Description: Integrated Precision Battery Sensor For Automotive
• Manufacturer: Analog Devices, Inc.

ADuC7030/ADuC7033
LIN (LOCAL INTERCONNECT NETWORK) INTERFACE
The ADuC7030/ADuC7033 features a high voltage physical
interface between the ARM7 MCU core and an external LIN
bus. The LIN interface operates as a slave only interface
operating from 1-20KBaud, and is compatible with the LIN2.0
standard. The pull-up resistor required for a slave node is on-
chip, reducing the need for external circuitry. The LIN protocol
is emulated using the on-chip UART, an IRQ, a dedicated LIN
Timer and the high voltage transceiver which is also
incorporated on-chip. This is shown in Figure 41. The LIN is
clocked from the Low Power Oscillator, for the Break Timer,
and a 5MHz output from the PLL which is used for the synch
byte timing.
GPSDAT[21]
GP2DAT[29]
131kHz
LHS INTERRUPT
5MHz
GPIO12
IRQEN[7]
AND
ADuC7030
ADuC7030
HARDWARE
LHSVAL0
LHSVAL1
UART
LHS
RxD ENABLE
LHSCON0[8]
GP2CON[20]
FUNCTION
RxD
TxD
SELECT
GPIO12
INTERRUPT
LOGIC
LHS
Figure 41. LIN I/O, Block Diagram
DISABLE
OUTPUT
SHORT-CIRCUIT
HVCFG0[1:0]
Rev. PrE | Page 132 of 150
LIN MODE
HVCFG1[2]
CONTROL
FOUR LIN
INTERRUPT
SOURCES
BREAK LHSSTA[0]
START LHSSTA[1]
STOP LHSSTA[2]
BREAK
ERROR LHSSTA[4]
INPUT
VOLTAGE
THRESHOLD
REFERENCE
BPF
TRIP REFERENCE
SHORT-CIRCUIT
INTERNAL
LIN MMR DESCRIPTION
The LIN Hardware Synchronization (LHS) functionality is
controlled via five MMRs. The function of each MMR is
described below:.
LHSSTA:
LHSCON0:
LHSCON1:
LHSVAL0:
LHSVAL1:
VDD
PROTECTION
INTERNAL
SHORT-CIRCUIT
SENSE
RESISTOR
VOLTAGE
LIN ENABLE
(INTERNAL
HVCFG0[5]
OVER
LHS Status Register. This MMR contains
information flags which describe the current
status on the interface.
LHS Control Register 0. This MMR controls the
configuration of the LHS Timer.
Dictates which edge of the LIN Synchronization
byte the LHS starts/stops counting.
LHS Synchronization 16Bit Timer, which is
controlled by LHSCON0.
LHS Start and Stop Edge Control Register
LHS Break Timer Register
PULL-UP)
Preliminary Technical Data
EXTERNAL
IO_VSS
LIN PIN
SCR
VDD
MASTER ECU
PROTECTION
DIODE
MASTER ECU
PULL-UP
C
LOAD