AS8650B-ZQFM-01 ams

AS8650B High-efficient Power Management Device with High-speed CAN Interface 1 General Description 2 Key Features DCDC converter for 5V output with very high efficiency The AS8650B is a companion IC which combines power management functions and a fully conforming high-speed CAN Three voltage regulators providing 3.3V, 2.8V and 1.8V with Transceiver in one high performance analog device for automotive accuracy better than 2.5% (Two are adjustable through factory applications. The AS8650B is powered by the battery, provides 4 settings). output voltage levels of which 3 outputs in the range of 1.8V to 3.3V High-speed CAN interface (ISO 11898-5) with remote wake-up with a maximum current consumption up to 120mA at the LDO voltage regulator outputs. An integrated DCDC converter with a very Comprehensive voltage monitoring high efficiency for the 5V output supplies the 3 voltage regulators Configurable watchdog functions for start-up, operation, and and ensures a voltage stability of 2.5%. The combination of DCDC standby converter with low-drop-out voltage regulators makes the AS8650B suitable for all Automotive Control Units where power efficiency is a Automatic thermal shutdown protection must. Excellent EMC performance with outstanding switching The AS8650B provides a high-speed CAN interface up to 1Mbps technology for the DCDC converter communication rate conforming to ISO 11898-5. The AS8650B Ambient temperature range from -40C to +105C in maximum provides wake-up via remote wake-up at CAN bus lines and a local load conditions wake pin. The watchdog unit provides three different timing Lead-free 36-pin QFN (6x6x0.9) package functions: start-up, window- and timeout watchdog configurable via the SPI and IC interface. Voltage monitoring is implemented for the battery supply, DCDC 3 Applications output and the 3 LDO regulator outputs. Undervoltage will be The AS8650B provides high efficient and flexible power supply signalled on the INTN pin to the microcontroller. All diagnostics and together with state-of-the-art high-speed CAN Interface for status flags can be accessed with the SPI interface. automotive control units.The device is pin compatible with AS8550 The product is available in a 36-pin QFN (6x6x0.9) package. (LIN interface) in order to change from CAN to LIN easy. Figure 1. AS8650B Block Diagram VSUP AS8650B I2C EN FB CSSPI DC / DC Converter 5V SCLKI2C /SCLKSPI I2C LX SPI SDAI2C / SDISPI SDOSPI V5V LDO1 V5V LDO2 INTN V5V LDO3 Configurable VREG Voltage CANH Regulator SPLIT High-speed CAN CANL Digital Configurable Transceiver VREG Logic RxD Voltage Regulator TxD Configurable VREG Watchdog Voltage RESET Regulator WAKE GND www.ams.com/AS8650 Revision 1.1 1 - 46AS8650B Datasheet - Contents Contents 1 General Description .................................................................................................................................................................. 1 2 Key Features............................................................................................................................................................................. 1 3 Applications............................................................................................................................................................................... 1 4 Pin Assignments ....................................................................................................................................................................... 4 4.1 Pin Descriptions.................................................................................................................................................................................... 4 5 Absolute Maximum Ratings ...................................................................................................................................................... 6 6 Electrical Characteristics........................................................................................................................................................... 7 6.1 Electrical System Specification............................................................................................................................................................. 8 6.2 DCDC Converter .................................................................................................................................................................................. 8 6.3 Low Drop Out Regulators..................................................................................................................................................................... 9 6.4 CAN Transceiver ................................................................................................................................................................................ 10 6.4.1 Timing Diagrams........................................................................................................................................................................ 12 6.5 Undervoltage Detection...................................................................................................................................................................... 13 6.6 Digital Timing Specification ................................................................................................................................................................ 13 6.6.1 System Specification and Timings............................................................................................................................................. 16 7 Detailed Description................................................................................................................................................................ 17 7.1 Operating Modes and States.............................................................................................................................................................. 17 7.1.1 Normal Mode ............................................................................................................................................................................. 17 7.1.2 Receive-Only Mode ................................................................................................................................................................... 17 7.1.3 Standby Mode............................................................................................................................................................................ 17 7.1.4 Sleep Mode................................................................................................................................................................................ 17 7.2 Power Management Strategy............................................................................................................................................................. 17 7.3 State Diagram..................................................................................................................................................................................... 20 7.4 Initialization Sequence........................................................................................................................................................................ 20 7.5 DCDC Converter ................................................................................................................................................................................ 22 7.6 Voltage Regulator LDO1..................................................................................................................................................................... 22 7.7 Voltage Regulator LDO2..................................................................................................................................................................... 22 7.8 Voltage Regulator LDO3..................................................................................................................................................................... 22 7.9 Over-Temperature Monitor ................................................................................................................................................................. 22 7.10 Undervoltage Reset.......................................................................................................................................................................... 22 7.11 Reset Block...................................................................................................................................................................................... 23 7.12 CAN Transceiver .............................................................................................................................................................................. 24 7.12.1 BUS Driver............................................................................................................................................................................... 24 7.12.2 Normal Receiver ...................................................................................................................................................................... 24 7.12.3 Low Power Receiver................................................................................................................................................................ 24 7.12.4 Operating Modes ..................................................................................................................................................................... 24 7.12.5 Local Wake-up Event............................................................................................................................................................... 24 7.12.6 Remote Wake-up..................................................................................................................................................................... 25 7.13 Internal Flags.................................................................................................................................................................................... 26 7.13.1 VSUP UV flag ........................................................................................................................................................................ 26 7.13.2 VSUP POK flag...................................................................................................................................................................... 26 7.13.3 V5V UV flag ........................................................................................................................................................................... 26 7.13.4 V5V POK flag......................................................................................................................................................................... 26 7.13.5 VLDO2 UV flag ...................................................................................................................................................................... 26 7.13.6 VLDO2 POK flag.................................................................................................................................................................... 26 www.ams.com/AS8650 Revision 1.1 2 - 46