Rainbow Electronics ATA6662 - Manual (Page 11)

11
4916E–AUTO–02/07
ATA6662 [Preliminary]
9 Internal Timers
9.1
Dominant time for wake-up via
LIN bus
V
LIN
= 0V 6 T
BUS
30 90 150 µs A
9.2
Time of low pulse for wake-up
via pin WAKE
V
WAKE
= 0V 3 T
WAKE
7 35 50 µs A
9.3
Time delay for mode change
from pre-normal mode to normal
mode via pin EN
V
EN
= 5V 2 T
norm
2 7 15 µs A
9.4
Time delay for mode change
from normal mode into sleep
mode via pin EN
V
EN
= 0V 2 T
sleep
2 7 12 µs A
9.5 TXD dominant time out timer V
TXD
= 0V 4 T
dom
6 9 20 ms A
9.6
Power-up delay between
V
S
= 5V until INH switches to
high
V
VS
= 5V T
VS
200 µs A
10
LIN Bus Driver (see Figure 6-1 on page 12 )
Bus load conditions: Load1, small, 1 nF 1 k
Ω
; Load2, big, 10 nF 500
Ω
; R
RXD
= 5 k
Ω
; C
RXD
= 20 pF;
The following two rows specify the timing parameters for proper operation at 20.0 kBits/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
= 50 µs
D1 = t
bus_rec(min)
/ (2
×
t
Bit
)
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
= 50 µs
D2 = t
bus_rec(max)
/ (2
×
t
Bit
)
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
= 96 µs
D3 = t
bus_rec(min)
/ (2
×
t
Bit
)
LIN D3 0.417 A
10.4 Duty cycle 4
TH
Rec(max)
= 0.389
×
V
S
TH
Dom(max)
= 0.251
×
V
S
V
S
= 7.0V to 18V
t
Bit
= 96 µs
D4 = t
bus_rec(min)
/ (2
×
t
Bit
)
LIN D4 0.590 A
11
Receiver Electrical AC Parameters of the LIN Physical Layer
LIN receiver, RXD load conditions (C
RXD
): 20 pF, R
pull-up
= 5 k
Ω
11.1
Propagation delay of receiver
(see
Figure 6-1 on page 12 )
t
rec_pd
= max(t
rx_pdr
, t
rx_pdf
)
V
S
= 7.0V to 18V
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
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