L9613B(1999) Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

fabricante

L9613B
(Rev.:1999)

DATA INTERFACE

STMicroelectronics 

L9613B

ELECTRICAL CHARACTERISTICS (continued)

Symbol

CKI,LO,RX

fLI-LO

fK-RX

fTX-K

fLI-LO

fK-RX

fTX-K

Parameter

Internal output capacities

Transmission frequency

Rise Time

Fall Time

tOFF,LI-LO

tOFF,K-RX

tOFF,TX-K

tON,LI-LO

tON,K-RX

tON,TX-K

tdSB ON

tdSB OFF

Switch OFF time

Switch ON time

Standby reaction time

Test Condition

Min.

9V < VS < 16V,

130

(external loads)

Tmin ≥ 20 ⋅ RKO ⋅ CK - Kline

for the definition of tr, tf see

FIG. 1,

2)

Typ.

0.4

Max.

20

2

Unit

pF

kHz

µs

9V < VS < 16V,

(external loads)

Tmin ≥ 20 ⋅ RKO ⋅ CK - Kline

for the definition of tr, tf see

FIG. 1

0.4

2

µs

1.3

3

µs

9V < VS < 16V,

(external loads)

Tmin ≥ 20 ⋅ RKO ⋅ CK - Kline

VTX = 0V, IK ≥ 7mA

VLI = 0V, 9V < VS < 16V

see FIG. 2

1.3

3

µs

10

20

µs

20

40

µs

Note 2) Speed limitation related to external capacitance CextRX, LO and internal impedance CLO,RX, RLO, RRX for rise time.

tr = RLO,RX ⋅ (CLO,RX + Cext RX, LO) ⋅ 1.38.

Note 3) In case of spikes on VCC ≥ 0.5V KOUT will be switched On for typical 10µs which represents the standby tdSB reaction time.

FUNCTIONAL DESCRIPTION

The L9613B is a monolithic bus driver designed to provide bidirectional serial communication in automo-

tive applications.

The device provides a bidirectional link, called K, to the VBat related diagnosis bus. It also includes a

separate comparator L which is also able to be linked to the VBat bus. The input TX and output RX of K

are related to VCC with her integrated pull up resistances. Also the L comparator output LO has a pull

up resistance connected to VCC.

All VBat bus defined inputs LI and K have supply voltage dependent thresholds together with sufficent

hysteresis to suppress line spikes. These pins are protected against overvoltages, shorts to GND and

VS and can also be driven beyond VS and GND. These features are also given for TX, RX and LI only

taking into account the behaviour of the internal pull up resistances. The thermal shut down function

switches OFF the K output if the chip temperature increases above the thermal shut down threshold. To

reactivate K again the chip temperature must decrease below the K switch ON temp. To achieve no fault

for VS undervoltage conditions the outputs will be switched OFF and stay at high impedance. The de-

vice is also protected against reverse battery condition. During lack of VS or GND all pins shows high

impedance characteristic. To realize a lack of the VS related bus line LI and K the outputs LO and RX

shows defined ON status. Supressing all 4 classes of ”Schaffner” signals (Schaffner 1; 2; 3a,b; 4) all

pins can be load with short energy pulses of max. ±0.2mJ. All these features together with a high possi-

ble baud rate >130Kbaud, controlled output slopes for low EMI, a wide power supply voltage range and

a real standby function with zero power consumption ISSB typ ≤ 1µA during system depowering VCC

≤0.5V make this device high efficient for automotive bus system.

After wake up of the system from SB condition the first output signal will have an additional delay time

tdtyp ≤ 5µs.

The typical output voltage behaviour for the K, LO, RX outputs as a function of the output current is

shown in Fig.5. Fig.6 shows a waveform of the output signal when the low level changes from RON ⋅ IOUT

to IOUT ⋅ 2 ⋅ RON + UBE state. This variation occurs due to too low output current or after a negative tran-

sient forced to the output or to the supply voltage line.

4/10

Share Link: