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NCV7425
www.onsemi.com
4
Figure 3. Pin Assignment
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
BB
V
CC
LIN
GND
GND
WAKE
INH
OTP_SUP
n.c.
RxD
TxD
RSTN
STB
EN
TEST
n.c.
NCV7425
Table 3. PIN FUNCTION DESCRIPTION
Pin Number Pin Name Description
1 V
BB
Battery supply input
2 LIN LIN bus output/input
3 GND Ground
4 GND Ground
5 WAKE High voltage digital input pin to switch the part from sleep− to standby mode
6 INH Inhibit output
7 OTP_SUP Supply for programming of trimming bits at factory testing, needs to be grounded in the application
8 n.c. not connected
9 n.c. not connected
10 TEST Digital input for factory testing, needs to be grounded in the application
11 EN Enable input for mode control
12 STB Standby mode control input
13 RSTN Reset output; open−drain output with an on−chip pull−up resistor
14 TxD Transmit data input, Low in dominant state
15 RxD Receive data output; Low in dominant state; push−pull output
16 V
CC
Voltage regulator output
FUNCTIONAL DESCRIPTION
Overall Functional Description
LIN is a serial communication protocol that efficiently
supports the control of mechatronic nodes in distributed
automotive applications. The domain is class−A multiplex
buses with a single master node and a set of slave nodes.
NCV7425 is designed as a master or slave node for the
LIN communication interface with an integrated 3.3 V or
5 V voltage regulator having a current capability up to
150 mA for supplying any external components
(microcontroller, CAN node, etc.).
NCV7425 contains the LIN transmitter, LIN receiver,
voltage regulator, power−on−reset (POR) circuits and
thermal shutdown (TSD). The LIN transmitter is optimized
for the maximum specified transmission speed of 20 kBaud
with EMC performance due to reduced slew rate of the LIN
output.
The junction temperature is monitored via a thermal
shutdown circuit that switches the LIN transmitter and
voltage regulator off when temperature exceeds the TSD
trigger level.
NCV7425 has four operating states (normal mode, low
slope mode, standby mode, and sleep mode) that are
determined by the input signals EN, WAKE, STB, and TxD.
Operating States
NCV7425 provides four operating states, two modes for
normal operation with communication, one standby without
communication and one low power mode with very low
current consumption − see Figure 4 and Table 4.