Rainbow Electronics ATA6664 - Manual (Page 14)

14
9146E–AUTO–03/11
Atmel ATA6663/ATA6664
10
LIN Bus Driver AC Parameter with Different Bus Loads
Load 1 (small): 1nF, 1k
Ω
; Load 2 (large): 10nF, 500
Ω
; R
RXD
= 5k
Ω
; C
RXD
= 20pF;
Load 3 (medium): 6.8nF, 660
Ω
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
TH
Rec(max)
= 0.744
×
V
S
TH
Dom(max)
= 0.581
×
V
S
V
S
= 7.0V to 18V
t
Bit
= 50µs
D1 = t
bus_rec(min)
/ (2
×
t
Bit
)
6 D1 0.396 A
10.2 Duty cycle 2
TH
Rec(min)
= 0.422
×
V
S
TH
Dom(min)
= 0.284
×
V
S
V
S
= 7.0V to 18V
t
Bit
= 50µs
D2 = t
bus_rec(max)
/ (2
×
t
Bit
)
6 D2 0.581 A
10.3 Duty cycle 3
TH
Rec(max)
= 0.778
×
V
S
TH
Dom(max)
= 0.616
×
V
S
V
S
= 7.0V to 18V
t
Bit
= 96µs
D3 = t
bus_rec(min)
/ (2
×
t
Bit
)
6 D3 0.417 A
10.4 Duty cycle 4
TH
Rec(min)
= 0.389
×
V
S
TH
Dom(min)
= 0.251
×
V
S
V
S
= 7.0V to 18V
t
Bit
= 96µs
D4 = t
bus_rec(max)
/ (2
×
t
Bit
)
6 D4 0.590 A
11
Receiver Electrical AC Parameters of the LIN Physical Layer
LIN receiver, RXD load conditions: C
RXD
= 20pF, R
pull-up
= 5k
Ω
11.1
Propagation delay of receiver
(see
Figure 6-1 on page 15 )
t
rec_pd
= max(t
rx_pdr
, t
rx_pdf
)
V
S
= 7.0V to 18V
1 t
rx_pd
6 µs A
11.2
Symmetry of receiver
propagation delay rising edge
minus falling edge
t
rx_sym
= t
rx_pdr
– t
rx_pdf
V
S
= 7.0V to 18V
1 t
rx_sym
–2 +2 µs A
6. Electrical Characteristics (Continued)
5V < V
S
< 27V, T
j
= –40°C to +150°C
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