L9924TR datasheet(21/85 Pages) STMICROELECTRONICS

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L9924

Electrical specifications

5.3.5

Pin “LIN/BSS”

This pin can be used for both LIN and BSS communication protocols. In order to allow the

pin sharing between LIN and BSS protocol (the internal pull-up resistor necessary for LIN is

not used by BSS protocol), it is necessary to select the desired protocol using the

PROT_SEL pin, RC pin and control internal pull-up resistor by bit 4 of SPI register 0x08.

Because of the internal pull-up resistor, when not used (no LIN or BSS protocol) the pin

should be left open and the “wake-up by LIN” function must be disabled by SPI.

LIN general requirements:



Speed communication up to 20 kbit/s (100 kbit/s for Flash).



LIN 2.1 compliant (SAEJ2602 compatible) transceiver.



Functional range from +40 V to -18 V DC at LIN/BSS pin.



GND disconnection fail safe at module level.



Off mode: does not disturb network.



GND shift operation at system level.



Micro controller interface with CMOS compatible I/O pins.



ESD: Immunity against automotive transients per ISO7637 specification



Matched output slopes and propagation delay



In order to further reduce the current consumption in standby mode, the integrated LIN

bus interface offers an ultra low current consumption.

IPSELPU Pull-up current

Active mode

RPSEL current when pull-up to

internal 3.3-V power rail

V(PROT_SEL)=V(GND)

--33

μA

IPSELPD Pull-down current

Power Stand-by mode

RPSEL current when pull-down to

GND

V(PROT_SEL) = VDD

-33

μA

Table 12. Electrical characteristics pin “PROT_SEL” (continued)

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

Table 13. Electrical characteristics pin PROT_SEL and RC pin protocol

PROT_SEL PIN level

RC PIN level

PROTOCOL SELECTED

Low

LIN

Low

High (through ext pull-up resistor)

BSS

High

High (through ext pull-up resistor

for PCM and C-Term)

Low (for RVC)

All other protocols

High

Reserved

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