Rainbow-electronics ATA6670 Manual de usuario descargar pdf (Pagina 15)

9204C–AUTO–09/11

Atmel ATA6670 [Preliminary]

LIN Bus Driver AC Parameter with Different Bus Loads

Load 1 (small): 1nF, 1kΩ; Load 2 (large): 10nF, 500Ω; R

RXD

= 5kΩ; C

RXD

= 20pF;

Load 3 (medium): 6.8nF, 660Ω characterized on samples; 10.1 and 10.2 specifies the timing parameters for proper

operation at 20Kbit/s, 10.3 and 10.4 at 10.4Kbit/s.

10.1 Duty cycle 1

Rec(max)

= 0.744 × V

Dom(max)

= 0.581 × V

= 7.0V to 18V

Bit

= 50µs

D1 = t

bus_rec(min)

/(2 × t

Bit

)

LIN D1 0.396 A

10.2 Duty cycle 2

Rec(min)

= 0.422 × V

Dom(min)

= 0.284 × V

= 7.0V to 18V

Bit

= 50µs

D2 = t

bus_rec(max)

/(2 × t

Bit

)

LIN D2 0.581 A

10.3 Duty cycle 3

Rec(max)

= 0.778 × V

Dom(max)

= 0.616 × V

= 7.0V to 18V

Bit

= 96µs

D3 = t

bus_rec(min)

/(2 × t

Bit

)

LIN D3 0.417 A

10.4 Duty cycle 4

Rec(min)

= 0.389 × V

Dom(min)

= 0.251 × V

= 7.0V to 18V

Bit

= 96µs

D4 = t

bus_rec(max)

/(2 × t

Bit

)

LIN D4 0.590 A

Receiver Electrical AC Parameters of the LIN Physical Layer

LIN receiver, RXD load conditions: C

RXD

= 20pF, R

pull-up

= 5kΩ

11.1

Propagation delay of receiver

(see Figure 6-1 on page 16)

rec_pd

= max(t

rx_pdr

, t

rx_pdf

)

= 7.0V to 18V

RXD t

rx_pd

6µsA

11.2

Symmetry of receiver

propagation delay rising edge

minus falling edge

rx_sym

= t

rx_pdr

– t

rx_pdf

= 7.0V to 18V

RXD t

rx_sym

–2 +2 µs A

6. Electrical Characteristics (Continued)

5V < V

< 27V, T

= –40°C to +150°C; the values below are valid for each of the two nearly identical integrated LIN transceivers unless

otherwise specified.

No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type*

*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter

1 2 ... 10 11 12 13 14 15 16 17 18 19 20

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