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PDF AS8520 Data sheet ( Hoja de datos )
| Número de pieza | AS8520 | |
| Descripción | LIN Transceiver | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS8520 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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Preliminary Data Sheet
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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
LIN Transceiver
Slew
Control
VCC
AS8520
SPI
Interface,
Diagnostic,
Window
Watchdog
(WWD)
GND
GND
TX
CS
SCLK
SDO
SDI
www.austriamicrosystems.com/Lin_CompanionIC/AS8520
Revision 0.01
1 - 34
1 page  
AS8520
Preliminary Data Sheet - Pin Assignments
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Table 1. Pin Descriptions
Pin Name
VCC
VSS
NC
NC
NC
EN
Pin Number
19
20
21
22
23
24
Description
Regulated 5V/3.3V supply for loads up to 50mA,
OTP selectable (factory programmable)
GND
Not connected.
Not connected.
Not connected.
High voltage compatible. Enable pin with pull down to VSS, active high.
www.austriamicrosystems.com/Lin_CompanionIC/AS8520
Revision 0.01
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5 Page 
AS8520
Preliminary Data Sheet - Electrical Characteristics
Figure 3. LIN Timing Diagram
tbit
TXD
tbit
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LIN
Vth_rec(max)
Vth_dom(max)
Vth_rec(min)
Vth_dom(min)
tbus_dom(max)
tbus_rec(min)
tbus_dom(min)
tbus_rec(max)
6.1.3 VCC Undervoltage Reset and Window Watchdog
The values in this table are valid for normal and standby modes. All parameters are tested unless mentioned.
Table 10. Electrical Characteristics
Symbol
Parameter
Conditions
Min Typ Max
Vuvr_off
Vuvr_on
VCC under-voltage threshold off
VCC under voltage threshold on
Rising edge of VCC
Falling edge of VCC
2.55
2.3
2.95
2.7
Vuvr1_off
VCC under voltage threshold off
(Default)
Rising edge of VCC
3.0
3.4
Vuvr1_on
VCC under voltage threshold on
(Factory Option)
Falling edge of VCC
2.75
3.15
Vuvr2_off
VCC under voltage threshold off
(Factory Option)
Rising edge of VCC
3.5
3.9
Vuvr2_on
VCC under voltage threshold on
(Factory Option)
Falling edge of VCC
3.25
3.65
Vuvr3_off
VCC under-voltage threshold off
(Factory Option)
Rising edge of VCC
4.0
4.4
Vuvr3_on
VCC under voltage threshold on
(Factory Option)
Falling edge of VCC
3.75
4.15
Vhyst_vcc
Hysteresis of under-voltage threshold
on/off VCC
Default and all other OTP options
0.1 0.25 0.4
trr Spike filter on VCC
To remove disturbance
4
Vsuvr_off VSUP under-voltage threshold off
3.85
Vsuvr_on VSUP under-voltage threshold on
BOR level (considered to be the Master
Reset for AS8520)
3.25
Hysteresis on under-voltage threshold
on/off VSUP
0.2 0.5 0.7
WD_TCL
WWD non-service time
(if factory enabled)
RESET will be generated1
0-75 0 -100 0-125
WD_TSV
WWD Service – time
(if factory enabled)
RESET will not be generated
75-150 100-200 125-250
Units
V
V
V
V
V
V
V
V
V
µs
V
V
V
ms
ms
www.austriamicrosystems.com/Lin_CompanionIC/AS8520
Revision 0.01
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS8520.PDF ] | |
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