AS8520 Datasheet, PDF (1/34 Pages) ams AG – LIN Transceiver with Voltage Regulator, Attenuator, Relay Drivers, MCU Interface for Automotive Applications

Preliminary Data Sheet
AS8520
LIN Transceiver with Voltage Regulator, Attenuator,
Relay Drivers, MCU Interface for Automotive Applications
1 General Description
The AS8520 is a companion IC for sensor and actuator LIN slaves.
The device provides application specific add-ons, such as the
resistive attenuator for battery voltage sensing, a micro controller
interface to control 2 relay drivers, to access control register, and
diagnosis options. The AS8520 has a window watchdog which can
be enabled as a factory option.
Micro controller 4-wire interface for relay driver control, device
configuration, status and diagnosis read out, register read /
write
Operating modes: Normal and Standby or Normal and Sleep as
a factory option
Window Watchdog with timing options if factory enabled
Backup registers to store MCU data during VCC shut down
2 Key Features
Voltage attenuator with disable. Factory selectable ratio options
of 21 and 481
Operating voltage 6 to 18V, max. 42V for 500 ms
Linear, low-drop voltage regulator: VCC = 5V ± 3% or VCC =
3.3V as a factory option
50mA load current
Typical 35 µA quiescent current in standby mode
Undervoltage detection with reset output, factory adjustable
undervoltage threshold and reset time
LIN bus transceiver with load independent slew control con-
forming to LIN 2.0 and SAE J2602, short circuit protection, TX
time out fail safe feature, over temperature warning and shut
down
Figure 1. AS8520 Lin Transceiver Block Diagram
Two low side relay drivers RON < 5Ω
-40ºC to +125ºC ambient operating temperature
AEC Q 100 automotive qualified
6kV ESD on LIN pin according to IEC 61000-4-2
24bit chip ID for traceability and module ID
24-pin QFN (6x6) package
3 Applications
The AS8520 is suitable for small actuator or sensor LIN slaves. The
device is ideal for LIN 2.0/2.1 network applications like Window lift
actuators, Sunroof actuators, Seat actuators and battery sensors.
VSUP
EN
VBAT_DIV
VBAT
VSS
BUS
LDRIVE1
LDRIVE2
VSS
LDO
VCC
POR-
VSUP
RESET_VSUP_N
Temperature
Limiter
TSHD
Mode
Control
Control
Signals
RESET_VSUP_N ^LIN
Wakeup
POR-
VCC
RESET_VCC_N
Reset
WWD Output Block
Resistive
divider
VSUP
Receiver
RESET
VCC
30k
Transmitter
RX
VCC
Relay driver
Slew
Control
VCC
LIN Transceiver
AS8520
SPI
Interface,
Diagnostic, ^GND
Window
Watchdog
(WWD)
GND
TX
CS
SCLK
SDO
SDI
www.austriamicrosystems.com/Lin_CompanionIC/AS8520
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