NCV7321
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10
Table 6. AC CHARACTERISTICS (V
BB
= 5 V to 27 V; T
J
= −40°C to +150°C; unless otherwise specified. For the transmitter
parameters, the following bus loads are considered: L1 = 1 kW / 1 nF; L2 = 660 W / 6.8 nF; L3 = 500 W / 10 nF)
Symbol
Parameter Conditions Min Typ Max Unit
LIN TRANSMITTER
D1
Duty Cycle 1 =
t
BUS_REC(min)
/
(2 x T
BIT
)
TH
REC(max)
= 0.744 x V
BB
TH
DOM(max)
= 0.581 x V
BB
T
BIT
= 50 ms
V
BB
= 7 V to 18 V
0.396 0.5
D2 Duty Cycle 2 =
t
BUS_REC(max)
/
(2 x T
BIT
)
TH
REC(min)
= 0.422 x V
BB
TH
DOM(min)
= 0.284 x V
BB
T
BIT
= 50 ms
V
BB
= 7.6 V to 18 V
0.5 0.581
D3 Duty Cycle 3 =
t
BUS_REC(min)
/
(2 x T
BIT
)
TH
REC(max)
= 0.778 x V
BB
TH
DOM(max)
= 0.616 x V
BB
T
BIT
= 96 ms
V
BB
= 7 V to 18 V
0.417 0.5
D4 Duty Cycle 4 =
t
BUS_REC(max)
/
(2 x T
BIT
)
TH
REC(min)
= 0.389 x V
BB
TH
DOM(min)
= 0.251 x V
BB
T
BIT
= 96 ms
V
BB
= 7.6 V to 18 V
0.5 0.590
Ttx_prop_down Propagation Delay of
TxD to LIN. TxD high
to low
(Note 17) 6
ms
Ttx_prop_up Propagation Delay of
TxD to LIN. TxD low to
high
(Note 17) 6
ms
T_fall LIN Falling Edge Normal Mode; V
BB
= 12 V 22.5
ms
T_rise LIN Rising Edge Normal Mode; V
BB
= 12 V 22.5
ms
T_sym LIN Slope Symmetry Normal Mode; V
BB
= 12 V −4 0 4
ms
LIN RECEIVER
Trec_prop_down
Propagation Delay of
Receiver Falling Edge
0.1 6
ms
Trec_prop_up Propagation Delay of
Receiver Rising Edge
0.1 6
ms
Trec_sym Propagation Delay
Symmetry
Trec_prop_down − Trec_prop_up −2 2
ms
MODE TRANSITIONS AND TIMEOUTS
T_LIN_wake
Duration of LIN
Dominant for Detection
of Wake−up via LIN bus
Sleep Mode 30 90 150
ms
T_to_stb Delay from LIN Bus
Dominant to Recessive
Edge to Entering of
Standby Mode after
Valid LIN Wake−up
Sleep Mode 10
ms
T_WAKE Duration of Low Level
on WAKE Pin for Local
Wake−up Detection
Sleep Mode 7 50
ms
T_enable Duration of High Level
on EN Pin for Tran−
sition to Normal Mode
Version NCV7321D10 2 5 10
ms
Version NCV7321D11/D12/MW2 2 7.5 18.5
ms
T_disable Duration of Low Level
on EN Pin for Tran−
sition to Sleep Mode
Version NCV7321D10 2 5 10
ms
Version NCV7321D11/D12/MW2 2 7.5 18.5
ms
T_TxD_timeout TxD Dominant
Time−Out
Normal Mode, TxD = Low, Guaran−
tees Baudrate as Low as 1 kbps
15 50 ms
17.Values based on design and characterization. Not tested in production.
