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AS8650B
High-efficient Power Management Device with High-speed CAN
Interface
1 General Description
The AS8650B is a companion IC which combines power
management functions and a fully conforming high-speed CAN
Transceiver in one high performance analog device for automotive
applications. The AS8650B is powered by the battery, provides 4
output voltage levels of which 3 outputs in the range of 1.8V to 3.3V
with a maximum current consumption up to 120mA at the LDO
voltage regulator outputs. An integrated DCDC converter with a very
high efficiency for the 5V output supplies the 3 voltage regulators
and ensures a voltage stability of ±2.5%. The combination of DCDC
converter with low-drop-out voltage regulators makes the AS8650B
suitable for all Automotive Control Units where power efficiency is a
must.
The AS8650B provides a high-speed CAN interface up to 1Mbps
communication rate conforming to ISO 11898-5. The AS8650B
provides wake-up via remote wake-up at CAN bus lines and a local
wake pin. The watchdog unit provides three different timing
functions: start-up, window- and timeout watchdog; configurable via
the SPI and I²C interface.
Voltage monitoring is implemented for the battery supply, DCDC
output and the 3 LDO regulator outputs. Undervoltage will be
signalled on the INTN pin to the microcontroller. All diagnostics and
status flags can be accessed with the SPI interface.
The product is available in a 36-pin QFN (6x6x0.9) package.
Figure 1. AS8650B Block Diagram
VSUP
I2C_EN
CS
SPI
SCLK
I2C
/ SCLK
SPI
SDA
I2C
/ SDI
SPI
SDO
SPI
INTN
I2C
SPI
2 Key Features
DCDC converter for 5V output with very high efficiency
Three voltage regulators providing 3.3V, 2.8V and 1.8V with
accuracy better than 2.5% (Two are adjustable through factory
settings).
High-speed CAN interface (ISO 11898-5) with remote wake-up
Comprehensive voltage monitoring
Configurable watchdog functions for start-up, operation, and
standby
Automatic thermal shutdown protection
Excellent EMC performance with outstanding switching
technology for the DCDC converter
Ambient temperature range from -40°C to +105°C in maximum
load conditions
Lead-free 36-pin QFN (6x6x0.9)
package
3 Applications
The AS8650B provides high efficient and flexible power supply
together with state-of-the-art high-speed CAN Interface for
automotive control units.The device is pin compatible with AS8550
(LIN interface) in order to change from CAN to LIN easy.
AS8650B
DC / DC Converter 5V
FB
LX
V5V_LDO1
V5V_LDO2
V5V_LDO3
V
REG
CANH
SPLIT
CANL
RxD
TxD
High-speed
CAN
Transceiver
Digital
Logic
Configurable
Voltage
Regulator
Configurable
Voltage
Regulator
Configurable
Voltage
Regulator
V
REG
RESET
Watchdog
V
REG
WAKE
GND
www.ams.com/AS8650
Revision 1.1
1 - 46
AS8650B
Datasheet - C o n t e n t s
Contents
1 General Description ..................................................................................................................................................................
5 Absolute Maximum Ratings ......................................................................................................................................................
6.1 Electrical System Specification.............................................................................................................................................................
6.3 Low Drop Out Regulators .....................................................................................................................................................................
6.4 CAN Transceiver ................................................................................................................................................................................
6.6 Digital Timing Specification ................................................................................................................................................................
6.6.1 System Specification and Timings............................................................................................................................................. 16
7.1 Operating Modes and States..............................................................................................................................................................
7.1.1
7.1.2
7.1.3
7.1.4
Normal Mode .............................................................................................................................................................................
7.2 Power Management Strategy .............................................................................................................................................................
7.3 State Diagram.....................................................................................................................................................................................
7.6 Voltage Regulator LDO1.....................................................................................................................................................................
7.7 Voltage Regulator LDO2.....................................................................................................................................................................
7.8 Voltage Regulator LDO3.....................................................................................................................................................................
7.12 CAN Transceiver ..............................................................................................................................................................................
7.12.1
7.12.2
7.12.3
7.12.4
7.12.5
7.12.6
7.13.1
7.13.2
7.13.3
7.13.4
7.13.5
7.13.6
BUS Driver...............................................................................................................................................................................
Normal Receiver ......................................................................................................................................................................
Low Power Receiver................................................................................................................................................................
Local Wake-up Event...............................................................................................................................................................
7.13.9 BUS Wake_up Flag .................................................................................................................................................................
7.13.10 Local Wake_up Flag ..............................................................................................................................................................
7.13.11 OVT_Warning Flag ................................................................................................................................................................
7.13.12 OVT_Recover Flag ................................................................................................................................................................
7.13.13 Bus Failure Flags...................................................................................................................................................................
7.13.14 Local Failure Flags ................................................................................................................................................................
7.16 Status Registers ...............................................................................................................................................................................
29
30
8 Application Information ...........................................................................................................................................................
8.1 Serial Peripheral Interface ..................................................................................................................................................................
8.3 Register Space ...................................................................................................................................................................................
38
9 Package Drawings and Markings ...........................................................................................................................................
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