AS8520-AQFT

Preliminary Data Sheet AS8520 L IN Tr a ns ce i ve r w it h Vol t ag e Re gu la t or, A t t e nua t or, 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 Voltage attenuator with disable. Factory selectable ratio options of 21 and 481 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 2 Key Features 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 conforming 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 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 PORVSUP LDO PORVCC RESET_VCC_N Control Signals LIN Wakeup Receiver WWD Output VCC Temperature Limiter TSHD RESET_VSUP_N EN Mode Control RESET_VSUP_N VBAT_DIV VBAT Resistive divider Reset Block VCC RESET VSUP RX VSS BUS Slew Control LIN Transceiver LDRIVE1 SPI Interface, Diagnostic, Window Watchdog (WWD) GND CS SCLK SDO SDI GND VCC TX 30k Transmitter VCC LDRIVE2 VSS Relay driver AS8520 www.austriamicrosystems.com/Lin_CompanionIC/AS8520 Revision 0.01 1 - 34 AS8520 Preliminary Data Sheet - C o n t e n t s 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 Detailed System and Block Specifications ............................................................................................................................................... 8 6.1.1 Low Dropout Regulator................................................................................................................................................................. 8 6.1.2 LIN Transceiver ............................................................................................................................................................................ 9 6.1.3 VCC Undervoltage Reset and Window Watchdog...................................................................................................................... 11 7 Detailed Description ................................................................................................................................................................. 14 7.1 Block Description.................................................................................................................................................................................... 14 7.1.1 7.1.2 7.1.3 7.1.4 7.1.5 7.1.6 7.1.7 7.1.8 7.1.9 7.2.1 7.2.2 7.2.3 7.2.4 7.2.5 Voltage Regulator (LDO) ............................................................................................................................................................ 14 Temperature Limiter ................................................................................................................................................................... 14 VSUP Undervoltage Reset ......................................................................................................................................................... 14 RESET........................................................................................................................................................................................ 14 VCC Undervoltage Reset............................................................................................................................................................ 15 Window Watchdog (WWD) ......................................................................................................................................................... 15 Resistive Divider ......................................................................................................................................................................... 16 HV Low Side Relay Driver Switches........................................................................................................................................... 16 LIN Transceiver .......................................................................................................................................................................... 16 Normal Mode .............................................................................................................................................................................. 16 Standby Mode............................................................................................................................................................................. 17 Sleep Mode................................................................................................................................................................................. 17 Temporary Shutdown Mode ....................................................................................................................................................... 17 Thermal Shutdown State ............................................................................................................................................................ 17 7.2 Operating Modes and States.................................................................................................................................................................. 16 7.3 State Diagram......................................................................................................................................................................................... 19 8 Application Information............................................................................................................................................................ 20 8.1 Initialization............................................................................................................................................................................................. 20 8.2 Wake-Up................................................................................................................................................................................................. 21 8.3 Over-Temperature Shutdown ................................................................................................................................................................. 21 8.4 LIN BUS Transceiver .............................................................................................................................................................................. 21 8.4.1 Transmit Mode............................................................................................................................................................................ 21 8.4.2 Receive Mode............................................................................................................................................................................. 21 8.5 RX and TX Interface ............................................................................................................................................................................... 22 8.5.1 Input TX ...................................................................................................................................................................................... 22 8.5.2 Output RX ................................................................................................................................................................................... 22 8.6 MODE Input EN...................................................................................................................................................................................... 23 8.7 Serial Port Interface................................................................................................................................................................................ 25 8.7.1 Device Configuration using 4-Wire Serial Port ........................................................................................................................... 25 8.8 Control and Diagnosis Registers ............................................................................................................................................................ 29 8.8.1 Definition of Control and Status Registers.................................................................................................................................. 29 8.9 ESD/EMC REMARKS ............................................................................................................................................................................ 31 www.austriamicrosystems.com/Lin_CompanionIC/AS8520 Revision 0.01 2 - 34 AS8520 Preliminary Data Sheet - C o n t e n t s 8.9.1 General Remarks........................................................................................................................................................................ 31 8.9.2 ESD-Test .................................................................................................................................................................................... 31 8.9.3 EMC........................................................................................................................................................................................... 31 9 Package Drawings and Markings............................................................................................................................................ 32 10 Ordering Information.............................................................................................................................................................. 34 www.austriamicrosystems.com/Lin_CompanionIC/AS8520 Revision 0.01 3 - 34 AS8520 Preliminary Data Sheet - P i n A s s i g n m e n t s 4 Pin Assignments Figure 2. Pin Assignments (Top View) EN 24 VSUP 1 23 22 21 VSS 20 VCC 19 18 RESET LIN 2 17 TX VSS 3 AS8520 24 pin QFN-24 16 RX VBAT_DIV 4 15 CS VBAT 5 14 SDO LDRIVE1 6 7 8 9 10 11 13 12 SDI SCLK LDRIVE 2 4.1 Pin Descriptions Table 1. Pin Descriptions Pin Name VSUP LIN VSS VBAT_DIV VBAT LDRIVE1 LDRIVE2 NC NC NC NC SDI SCLK SDO CS RX TX RESET Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Positive Power Supply LIN Bus GND Attenuated battery voltage Battery voltage sensing line Low side driver Low side driver Not connected. Not connected. Not connected. Not connected. Serial data in Serial clock Serial data out Chip select for Serial Interface LIN transceiver receive signal LIN transceiver transmit signal Digital Output referenced to VCC, active low Description www.austriamicrosystems.com/Lin_CompanionIC/AS8520 Revision 0.01 4 - 34 AS8520 Preliminary Data Sheet - P i n A s s i g n m e n t s 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 5 - 34 AS8520 Preliminary Data Sheet - A b s o l u t e M a x i m u m R a t i n g s 5 Absolute Maximum Ratings Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in Section 6 Electrical Characteristics on page 7 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 2. Absolute Maximum Ratings Parameter VSUP EN VCC DC Supply Voltage LIN VBAT LDRIVE1, LDRIVE2 RESET, RX, TX, CS, SCLK, SDO, SDI, VBAT_DIV Input current (latchup immunity) Iscr Min -0.3 Max 18 42 -0.3 -0.3 -27 -27 -0.3 -0.3 -100 ±2 ±4 Electrostatic Discharge (ESD) ±8 ±6 ±0.5 ±0.1 Total operating power dissipation (all supplies and outputs) Pt Thermal Package Resistance (Rth) Storage temperature (Tstrg) Package body temperature (Tbody) Humidity non-condensing 5 -55 0.75 33 +150 +260 85 W K/W ºC ºC % The reflow peak soldering temperature (body temperature) is specified according IPC/JEDEC JSTD-020C “Moisture/Reflow Sensitivity Classification for Non hermetic Solid State Surface Mount Devices”. kV VSUP + 0.3 7 +40 +42 50 VCC + 0.3 100 Units V V V V V V V mA Norm: Jedec 78 For on board signals VCC, TX, RX, Reset, CS, SCLK, SDO, SDI, VBAT_DIV, EN For VBAT, VSUP, VSS, LDRIVE1, LDRIVE2 LIN to GND, HBM Model LIN to GND, IEC6100-4-2 LIN to GND, CDM LIN to GND, MM QFN 24 in still air, soldered on JEDEC standard board @125º ambient, static operation = no time limit Soldered on JEDEC standard board @125º ambient, static operation = no time limit Comments Transient up to 500ms duration www.austriamicrosystems.com/Lin_CompanionIC/AS8520 Revision 0.01 6 - 34 AS8520 Preliminary Data Sheet - E l e c t r i c a l C h a r a c t e r i s t i c s 6 Electrical Characteristics Table 3. Electrical Characteristics Symbol Operating Conditions Normal operating condition VSUP VSS TAMB Isupp Positive Supply Voltage Negative Supply Voltage Ambient temperature Supply Current DC/AC Characteristics for Digital Inputs and Outputs Enable Input VIH VIL ILEAK Ipd_en TX, CS Input VIH VIL ILEAK Ipu SDI, SCLK VIH VIL ILEAK Ipd_spi RESET, SDO VOH VOL RX VOH VOL Ipu_reset High level output voltage Low level output voltage Pull-up current VSUP ≥ 6V, I = 1 mA VSUP ≥ 6V, I = 1 mA Pulled up to VCC -100 VCC-0.5 VSS + 0.4 -30 V V µA High level output voltage Low level output voltage VSUP ≥ 6V, I = 1 mA VSUP ≥ 6V, I = 1 mA VCC-0.5 VSS + 0.4 V V High level input voltage Low level input voltage Input leakage current Pull down current SDI, SCLK pulled to VSS -1 30 0.8VCC 0.2VCC +1 100 V V µA µA High level input voltage Low level input voltage Input leakage current Pull up current TX = VCC RX, TX,CS pulled to VCC -1 -100 0.8VCC 0.2VCC +1 -30 V V µA µA High level input voltage Low level input voltage Input leakage current Pull down current EN = L EN = VCC = 5V -1 30 0.8VCC 0.2VCC +1 100 V V µA µA 1 Parameter Conditions Min 6 Typ Max 18 27 42 Units V V V V ºC mA Jump-start/ over-voltage condition Load dump condition 0 Max junction temperature (TJ) 150ºC -40 +125 65 1. All pull-up, pull-downs are implemented with active devices. RESET, RX, SDO have been measured with 10pF load. www.austriamicrosystems.com/Lin_CompanionIC/AS8520 Revision 0.01 7 - 34 AS8520 Preliminary Data Sheet - E l e c t r i c a l C h a r a c t e r i s t i c s 6.1 Detailed System and Block Specifications Table 4. System Specifications Symbol Parameter Conditions No load on VCC, LIN inactive, VSUP = 14V, RES_DIV enabled IDDnom Current consumption normal mode No load on VCC, LIN active, VSUP = 14V, RES_DIV enabled No load on VCC, LIN inactive, VSUP = 14V, RES_DIV disabled IDDstby IDDsleep Current consumption standby mode Current consumption sleep mode @ 85ºC ambient (no load) @125ºC ambient (no load) @ 85ºC ambient (no load) @ 125ºC ambient (no load) Min Typ 300 700 250 40 45 30 35 µA µA µA Max Units 6.1.1 Low Dropout Regulator The LDO is a linear voltage regulator, which provides a regulated (band-gap stabilized) output voltage (VCC) from the battery supply voltage (VSUP). (6V < VSUP < 18V; -40ºC < TJ < +150ºC; all voltages are with respect to ground (VSS); positive current flows into the pin), normal operating mode if not otherwise mentioned. Table 5. LDO Block Specifications Symbol VSUP Parameter Battery Voltage Range Conditions Default, Need safe operating area calculations with package Rth Load < 50mA Factory option, load < 50mA 50 to 65mA VCC Output Voltage Range Factory option, 50 to 65mA Standby mode @ ICC < 5mA Load-dump condition, Iload < 50mA Factory option, Standby mode @ ICC < 5mA ICC_SH dVCC1 LOREG_SM LOREG_NM CL1 ESR1 CL2 ESR2 CSUP1E ESR1_CSUP CSUP2C ESR2_CSUP Output Short Circuit Current Line Regulation Load Regulation (Standby mode) Load Regulation (Normal mode) Output Capacitor (Electrolytic) Output Capacitor (Ceramic) Input capacitor (Electrolytic) Input capacitor (Ceramic) For EMC suppression For EMC suppression Normal mode Standby mode ΔVCC / ΔVSUP ΔVCC / ΔICCn (for Iload > 500uA) ΔVCC / ΔICCn (for Iload > 500uA) 2.2 1 100 0.02 10 1 100 0.02 3 50 5 Min 6 4.85 3.15 4.5 2.9 4.5 3.3 Typ 12 5.0 3.3 Max 18 5.15 3.45 5.15 3.45 5.5 5.5 3.6 250 250 8 10 1 10 10 220 1 100 10 220 1 mA mV/V mV/mA mV/mA µF Ω nF Ω µF Ω nF Ω V Units V www.austriamicrosystems.com/Lin_CompanionIC/AS8520 Revision 0.01 8 - 34 AS8520 Preliminary Data Sheet - E l e c t r i c a l C h a r a c t e r i s t i c s 6.1.2 LIN Transceiver (4.5V < VCC < 5.5V; 6V < VSUP < 18V; -40ºC < TJ < 150ºC, VBUS is the voltage on the LIN node. All voltages are with respect to ground (VSS); positive current flows into the pin. Table 6. DC Electrical Characteristics Symbol Driver Ibus_lim LIN_VOL Pull-up resistor Ibus_leak_rec Receiver Ibus_leak_dom Ibus_no_GND Ibus_no_bat Vbus_dom Vbus_rec Vbus_cnt Vhys Vbus_cnt = (Vth_dom + Vth_rec)/2 Vhys = (Vth_dom – Vth_rec) 1 1 Parameter Conditions Current limitation in Dominant State LIN = VSUP_max Output Voltage BUS (dominant state), ILIN = 40mA (short-circuit condition tested at VOL = 2.5V) Normal mode (recessive BUS level on TX pin) Driver OFF; VSUP = 7.3V, 8V