EVALUATION KIT AVAILABLE MAX17841B Automotive SPI Communication Interface (ASCI) General Description Benefits and Features The MAX17841B ASCI combines an SPI port with Supports Maxims Battery Management UART a universal asynchronous receiver transmitter (UART) Protocol specially designed to interface with Maxim battery SPI Interface Up to 4MHz management devices. UART Baud Rate Programmable Up to 2Mbps The UART can be configured to automatically 3.3V or 5V Operation perform Manchester encoding/decoding, message framing, Ultra-Low Quiescent Curren t parity, wake-up, and keep-alive signaling as required for Maxims battery management UART protocol. Transmit and Receive Buffers with Programmable The UART has programmable baud rates of 0.5Mbps, Interrupts Allow for Queuing of UART Messages 1Mbps, or 2Mbps and supports either single-ended or Manchester Encoder and Decoder Reduces Host differential signaling. For host efficiency, the UART Controller Burden contains a 28-byte transmit buffer and a 62-byte receive Operating Temperature Range from -40C to +105C buffer with host-configurable interrupt events. (AEC-Q100 Type 2) Supports ASIL Requiremen ts Applications Battery Management Systems (BMS) Ordering Information appears at end of data sheet. Electric and Hybrid Vehicles (EV/HEV) Energy Storage Systems (ESS) Simplified Operating Circuit V AA MASTER SLAVE(S) V CC 5V DC DCIN V DDL SUPPLY V AA 1F GNDL 0.1F V AA 1F AGND ISOLATORS 1.5k V CC RXP MAX178xx 15pF MAX17841B TXPL 100k TXNL 1.5k RXN BATTERY MISO DOUT MANAGEMENT 15pF MOSI DIN DEVICE SCLK SCLK SS CS 47 V CC TXP SYSTEM P RXPL 100k RXNL 47 TXN IRQ INT 100 GPIO SHDN 0.01F 19-6790 Rev 2 1/15MAX17841B Automotive SPI Communication Interface (ASCI) Absolute Maximum Ratings DCIN to AGND ........................................................ -0.3V to +6V Maximum Continuous Current into Any Pin .......................20mA V to AGND........................................................... -0.3V to +4V Maximum Average Power for ESD Diodes (Note 1) .... 14.4/W AA V to GNDL ......................................................... -0.3V to +4V Continuous Power Dissipation DDL AGND to GNDL......................................................-0.3V to +0.3V On Multilayer Board (T = +70C) A TXP, TXN to GNDL ................................. -0.3V to (V + 0.3V) 16 TSSOP (derate 11.1mW/C above +70C) .............889mW DDL DOUT to GNDL ..................................... -0.3V to (V + 0.3V) Operating Temperature Range ......................... -40C to +105C DCIN CTG to AGND............................................................-0.3V to +8V Storage Temperature Range ............................ -55C to +150C SHDN to AGND ..................................... -0.3V to (V + 0.3V) Junction Temperature (Continuous) ................................ +150C DCIN CS , DIN, SCLK, INT to GNDL ................................. -0.3V to +6V Soldering Lead Temperature for 10s ............................... +300C RXP, RXN to GNDL ................................................ -30V to +30V Note 1: Average power for time period where is the time constant (in s) of the transient diode current during a hot-plug event. For, example, if is 330s, the maximum average power is 0.793W. Peak current must never exceed 2A. Actual average power during hot-plug must be calculated from the diode current waveform for the application circuit and compared to the maximum rating. Stresses beyond those listed under Absolute Maximum Ratings 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 the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics ( V = 5V, V = V = 3.3V, T = T to T , unless otherwise noted, where T = -40C and T = +105C. Typical values DCIN AA DDL A MIN MAX MIN MAX are at T = +25C. Operation is with the recommended application circuit.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER REQUIREMENTS V = V = V = 3.3V nominal 3.1 3.3 3.5 DCIN AA DDL Supply Voltage V V DCIN V = 5V nominal V = V 4.5 5.0 5.5 DCIN AA DDL V = V = 3.3V 4 10 DCIN AA I V = 0V A SHUTDOWN SHDN V = 5V 1 10 DCIN I SHDN high, f = 0, f = 0 1.0 2.3 5.0 STANDBY SCLK UART Supply Current Continuous SPI writes at 4MHz, 50pF mA I TXP load, 50pF TXN load, f = 1.0 4 6 ACTIVE UART 2Mbps, Transmit Preambles mode REGULATOR 0mA < I < 10mA, VAA Output Voltage V 3.13 3.30 3.46 V AA 4.5V < V < 5.5V DCIN Short-Circuit Current I V = AGND 13.0 26.0 120.0 mA AASC AA V V falling 2.8 2.9 3.0 AARESET AA POR Threshold V V V rising 2.9 3.0 3.1 AAVALID AA POR Hysteresis V 40.0 100 mV AAHYS LOGIC INPUTS (SHDN, CS, DIN, SCLK) Pulldown Resistance (CS) R V = 5V 5.5 12 28.8 M CS CS Pulldown Resistance (SHDN) R V = 5V 0.75 1.5 3.0 M SHDN SHDN Input Leakage Current (DIN, I V , V = 0V -1.0 +1.0 A LKG DIN SCLK SCLK) Input Low Threshold V 0.3 x V V IL DCIN Input High Threshold V 0.7 x V V IH DCIN Maxim Integrated 2 www.maximintegrated.com