AS8650B datasheet(2/47 Pages) AMSCO

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AS8650B

High-efficient Power Management Device with High-speed CAN

Interface

www.ams.com/AS8650

Revision 1.1

1 - 46

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.

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.

DC / DC Converter 5V

I2C

SPI

High-speed

CAN

Transceiver

Watchdog

CSSPI

SCLKI2C /SCLKSPI

I2C_EN

CANH

RxD

TxD

RESET

Configurable

Voltage

Regulator

Configurable

Voltage

Regulator

Configurable

Voltage

Regulator

VREG

Digital

Logic

INTN

WAKE

V5V_LDO1

V5V_LDO2

V5V_LDO3

GND

VSUP

VREG

SPLIT

CANL

SDAI2C/ SDISPI

SDOSPI

AS8650B

Figure 1. AS8650B Block Diagram

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