33912 datasheet(36/47 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33912

FUNCTIONAL DEVICE OPERATIONS

LOGIC COMMANDS AND REGISTERS

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),

High Side Status Register (HSSR), and the Low Side Status

VMS - Voltage Monitor Status

This read-only bit indicates that one or more bits in the

VSR are set.

1 = Voltage Monitor bit set

0 = None

Figure 21. Voltage Monitor Status

LINS - LIN Status

This read-only bit indicates that one or more bits in the

LINSR are set.

1 = LIN Status bit set

0 = None

Figure 22. 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

Figure 23. High Side Status

LSS - Low Side Switch Status

This read-only bit indicates that one or more bits in the

LSSR are set.

1 = Low Side Status bit set

0 = None

Figure 24. Low Side Status

Mode Control Register - MCR

The Mode Control Register (MCR) allows switching

between the operation modes and to configure the 33912.

Writing the MCR will return the VSR.

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

Table 8. System Status Register

Read

VMS

LINS

HSS

LSS

VMS

BATFAIL

VDDOT

VSUV

VSOV

LINS

LINOC

LINOT

TXDOM

RXSHORT

Table 9. Mode Control Register - $0

Write

HVSE

LINPE

MOD2

MOD1

Reset

Value

Reset

Condition

POR

HS2OP

HS2CL

HS1OP

HS1CL

HSS

LS2OP

LS2CL

LS1OP

LS1CL

LSS

33912 Datasheet(PDF) 36 Page - Freescale Semiconductor, Inc

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