33910 Datasheet, PDF (33/44 Pages) Freescale Semiconductor, Inc – LIN System Basis Chip with 2x60mA High Side Drivers

FUNCTIONAL DEVICE OPERATIONS
LOGIC COMMANDS AND REGISTERS
REGISTER DEFINITIONS
System Status Register - SYSSR
The system status register (SYSSR) is always transferred
with every SPI transmission and gives a quick system status
overview. It summarizes the status of the voltage status
register (VSR), LIN status register (LINSR) and the HSSR.
Table 8. System Status Register
S7
S6
S5
S4
Read
VMS
LINS
HSS
–.
VMS - Voltage Monitor Status
This read-only bit indicates that one or more bits in the
voltage status register (VSR) are set.
1 = Voltage Monitor bit set
0 = None
BATFAIL
VDDOT
VSUV
VSOV
VMS
Figure 20. Voltage Monitor Status
LINS - LIN Status
This read-only bit indicates that one or more bits in the LIN
status register (LINSR) are set.
1 = LIN Status bit set
0 = None
LINOC
LINOT
TXDOM
RXSHORT
LINS
Figure 21. LIN Status
HSS - High Side Switch Status
This read-only bit indicates that one or more bits in the
HSSR are set.
1 = High Side Status bit set
0 = None
HS1CL
HS1OP
HS2CL
HS2OP
HSS
Figure 22. High Side Status
Mode Control Register - MCR
The MCR allows to switch between the operation modes
and to configure the 33910. Writing the MCR will return the
voltage status register (VSR).
Table 9. Mode Control Register - $0
C3
C2
C1
C0
Write
HVSE
LINPE
MOD2
MOD1
Reset
Value
1
1
-
-
Reset
Condition
POR
POR
-
-
HVSE - High-Voltage Shutdown Enable
This write-only bit enables/disables automatic shutdown of
the high side and the low side drivers during a high-voltage
VSOV condition.
1 = automatic shutdown enabled
0 = automatic shutdown disabled
LINPE - LIN pull-up enable.
This write-only bit enables/disables the 30kΩ LIN pull-up
resistor in Stop and Sleep modes. This bit also controls the
LIN bus wake-up threshold.
1 = LIN pull-up resistor enabled
0 = LIN pull-up resistor disabled
Analog Integrated Circuit Device Data
Freescale Semiconductor
33910
33