Owner's Manual for Allegro MicroSystems models including: A81411, A81411KEVGTR, A81411KEVGTR-1, A81411 Evaluation Board, A81411, Evaluation Board, Board
3 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Enable The A81411 Evaluation Board can be enabled by pulling either the EN pin high, the ENCAN pin high, or the ENBAT pin high.
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DocumentDocumentAPEK81411 A81411 Evaluation Board User Guide DESCRIPTION The A81411 Evaluation Board is designed to help system designers evaluate the operation and performance of a power management IC. The A81411 Evaluation Board provides connections to a Buck-Boost Pre-Regulator, 5× Linear Regulators and SPI communications. FEATURES · Wide input range: 3.2 to 36 V VIN operating · 2.2 MHz synchronous buck-boost preregulator (VREG: 5.35 V) with internal compensation · Five internal linear regulators with fold-back short-circuit protection VUC: 3.3 V or 5 V (selectable by a pin) regulator for microcontroller VLDOA: 5 V (or 3.3 V factory option) general-purpose low-dropout (LDO) regulator VLDOB: 5 V or 3.3 V (selectable by a pin) always-on LDO regulator VLDOP1 and VLDOP2: Two programmed (5 V or 3.3 V) and enabled via serial-port-interface (SPI) LDO regulators with short-to-battery protection for remote sensors · Two high-voltage enable inputs (ENBAT and ENCAN) Figure 1: A81411 Evaluation Board Table of Contents Description .......................................................................... 1 Features ............................................................................. 1 Using the Evaluation Board ................................................... 2 Performance Data ................................................................ 4 Schematic ........................................................................... 5 Layout ................................................................................ 6 Bill of Materials .................................................................... 7 Related Links....................................................................... 9 Revision History................................................................. 10 Table 1: A81411 Evaluation Board Configurations Configuration Name Part Number VLDOA Output Voltage A81411 A81411KEVGTR A81411KEVGTR-1 5 V 3.3 V Table 2: General Specifications Specification Min Input Operating Voltage 3.2 VIN VLDOB Start Voltage 5.7 VIN UVLO Start Voltage 5.72 VIN VLDOB Stop Voltage 4 VIN UVLO Stop Voltage 2.65 VIN UVLO Hysteresis ENBAT/ENCAN Upper Threshold 2.7 ENBAT/ENCAN Lower Threshold 2.2 ENBAT/ENCAN Hysteresis EN Upper Thresholds EN Lower Thresholds 0.8 Package 40-pin QFN with thermal pad Nom Max 36 6 6.3 5.88 6.12 5 2.9 3.15 2.5 3.2 3.5 2.6 2.9 500 2 Units V V V V V V V V mV V V APEK81411-UM, Rev. 1 MCO-0001836 February 26, 2025 USING THE EVALUATION BOARD This section provides an overview of the connections and configuration options of the A81411 Evaluation Board. Each group of connections highlighted in Figure 2 has a details section below. Figure 2 shows the default jumper positions. The A81411 datasheet contains detailed information on the use and functionality of each pin. Consult the A81411 datasheet for more detailed information than is contained in this user guide. VUC Configuration VIN Connections VLDOB Selection RLOAD Jumpers VOUT Connections SPI Communications Figure 2: A81411 evaluation board connections Power Input Connect a power supply to the green terminal block using two wires and tighten down the screws to clamp the wires in place. Clip leads can be used on the test points located on either side of the green terminal block. Observe the polarity on the board, connect the VIN to the positive supply terminal VBAT and GND to the negative supply terminal. Linear Regulator Outputs All five linear regulators have a test point connected to their output pin and a two pin header for their associated load resistors. While measuring the output voltage, connect the positive probe of the multimeter to the appropriate test point and the negative terminal of the multimeter to a nearby GND connection. To apply the load resistors incorporated on the board, install a two pin jumper on the appropriate two pin header for the desired output load resistor. To measure the output current, remove the two pin jumper and replace it with the two probes of an ammeter. Output Voltage Configuration The A81411 has the ability to configure five LDO outputs between either 5 V or 3.3 V outputs. The VUC and VLDOB regulator output voltages are pin selectable between 3.3V or 5V. These two regulators each have a three-pin jumper labeled VUCSEL and VLDOBSEL for easy configuration. For either regulator, place a two-pin jumper between the middle pin and the side marked with either 3.3 V or 5 V to select the output voltage for those regulators. The VLDOA regulator output voltage is a factory option. Two different A81411 part numbers are available for either the 3.3 V or 5 V option. The two VLDOP1 and VLDOP2 are selectable for either 5 V or 3.3 V and can be enabled by way of SPI communications. The VLDOB regulator is an always-on regulator. It starts regulation when the VIN voltage is above the undervoltage threshold, even if none of the available enable pins are high. SPI Communications The A81411 has a General User Interface (GUI) for easy communications through the SPI port to a PC using an FTDI cable, downloadable from the Allegro website. See the datasheet for detailed MCU SPI communication instructions. 2 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Enable The A81411 Evaluation Board can be enabled by pulling either the EN pin high, the ENCAN pin high, or the ENBAT pin high. For convenience, the ENCAN and ENBAT pins each have a switch to pull either of these pins high and enable the part. The EN pin has a test point to which an external signal such as that from a microcontroller can be used to enable the A81411. The external signal applied to the EN pin must be above 2 V and not more than 5 V. Diagnostic Outputs The A81411 incorporates a series of outputs to alert the microprocessor if any faults occur. Each one of these pins have a test point connected to them for easy access. Those signals include a Watchdog Fault (WD_Fn), power on reset (NPOR), a fault flag (FFn) and a gate driver enable (POE). Switching Frequency The switching frequency of the pre-regulator is fixed at 2.2 MHz typical, and is decreased to 1.1 MHz if the VIN voltage is increased above 19 V. It can be monitored by connecting an oscilloscope probe to the LX1 test point and GND. Startup Procedure To begin using the A81411 Evaluation Board, follow the instructions below and refer to the diagram in Figure 2 or the test point descriptions outlined in the A81411 Test Point Descriptions table. 1. Ensure the VUCSEL & VLDOB jumpers are in the proper positions for the desired output voltage. 2. Install the jumpers required to connect the regulated output load resistors on the A81411 Evaluation Board. 3. Apply an input voltage across the VBAT terminals above UVLO (5.88 V typical) with a minimum supply current of 1.5 A. 4. In addition to VLDOB, which is already operational, provide an enable signal between EN, ENBAT, or ENCAN to activate VREG and the other LDOs. Table 3: A81411 Test Point Descriptions Test Point Description VBAT Positive terminal for input voltage connection or connect wires to the VBAT screw down test block. V+ on the right. GND Negative terminal for input voltage connection or connect wires to the VBAT screw down test block. GND on left. ENCAN High level enable for wake by CAN. ENBAT Ignition enable input from the key/switch via a series resistor. Vin_S Vin_Sense is connected close to the DUT and is used to sense the actual voltage appearing on the input pin LX1 Switching node of the pre-regulator (2.2 MHz). VREG Output voltage of the pre-regulator. VLDOP1 Output voltage of VLDOP1 regulator (enabled and configured through SPI). VLDOP2 Output voltage of VLDOP2 regulator (enabled and configured through SPI). VUC Output voltage of VUC regulator (Select 3.3 V or 5 V using VUCSEL jumper). VLDOA Output voltage of VLDOA regulator (5 V or 3.3 V factory setting). VLDOB Output voltage of VLDOB regulator, always ON (Select 3.3 V or 5 V using VLDOBSEL jumper). nERROR Active low input used to drive POE low. AMUXO Output of the Analog Multiplexer. NPOR Reset output to the MCU EN Input to enable the A81411 (5 V max). WD_IN Watchdog input from MCU. POE Power on enable. FFn Fault flag, active low. WD_Fn Watchdog fault flag, active low. 3 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com EVALUATION BOARD PERFORMANCE DATA The following section provides performance data for the A81411 evaluation board. Figure 3: Startup sequence triggered on VIN Figure 4: Normal operation, nERROR and NPOR pins remain high 4 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com SCHEMATIC LAYOUT The figure below shows the A81411 evaluation board schematic. Figure 5: A81411 evaluation board schematic 5 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Figure 6: PCB top layer Figure 7: PCB inner layer 1 (PGND plane) Figure 8: PCB inner layer 2 (PGND plane) Figure 9: PCB bottom layer 6 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com BILL OF MATERIALS Table 4: A81411 Version Evaluation Board Bill of Materials ELECTRICAL COMPONENTS Designator Quantity Comment Description C1, C5, C16, C17 4 C2 1 C4 1 C6 1 C7 1 C8 1 C10 1 C11 1 C12, C13, C14, C15 4 C18 1 D1 1 R1, R2 2 0.10 µF 4.7 µF 47 µF 1 µF 0.10 µF 4.7µF 4.7 µF 10 µF 2.2 µF 0.47 µF Diode (Schottky)_ DO221BC 1.0 k CAP CER 0.1 µF 50 V X7R 0402 CAP CER 4.7 µF 50 V X5R 0805 CAP ALUM 47 µF 20 % 50 V SMD CAP CER 1 µF 25 V X7R 0805 CAP CER 0.1 µF 50 V X7R 0805 CAP CER 47 µF 10 V X6S 1210 CAP CER 4.7 µF 25 V X5R 0603 CAP CER 10 µF 10 V X5R 0603 CAP CER 2.2 µF 16 V X5R 0402 CAP CER 0.47 µF 50 V X7R 0805 Diode, Schottky, 45 V, 3 A, DO-221BC Resistor, 1.0 k, 1/8 W, 1%, 0805 R3 1 0 Resistor, 0, 1W, 2512 R4 1 R5, R6, R7, R8 4 U1 1 L1 1 100 475 A81411 2.2 µH Resistor,100 , 1/8 W, 1%, 0805 Resistor, 475 1/4 W, 1%, 1206 Buck-Boost Pre-Regulator, 5× Linear Regulators and SPI Inductor, 2.2 µH, 12.2 A, 10.3 m Manufacturer Murata Murata Nichicon Murata Murata Murata Murata Murata Murata Murata Vishay Semiconductors Vishay Dale Stackpole Electronics Panasonic Panasonic Allegro MicroSystems Coilcraft Manufacturer Part Number GCM155R71H104KE02D GRT21BR61H475ME13L UBC1H470MNS1GS GRM219R71E105KA88D GRM21BR71H104KA01L GRT32EC81A476ME13L GRM188R61E475KE11D GRT188R61A106KE13D GRM155R61C225KE11D GCM21BR71H474KA55L V4PAL45-M3/I CRCW08051K00FKTA RMCF2512ZT0R00 ERJ-6ENF1000V ERJ-8ENF4750V A81411KEVTR-T XGL6030-222MEC Continued on next page... 7 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com A81411 Version Evaluation Board Bill of Materials (continued) OTHER COMPONENTS Designator Quantity Comment Description Manufacturer GND1, GND2, GND4 3 GND Ground Bar, 18 AWG Bus Bar, 12 mm Body Alpha Wire J1, J2 2 VLDOBSEL. VUCSEL CONN HEADER VERT 3POS 2.54 MM Wurth Electronics J3, J4, J5, J6, J7 VUC_RL, VLDOA_ 5 RL, VLDOB_RL, VLDOP1_RL, CONN HEADER VERT 2POS 2.54MM Wurth Electronics VLDOP2_RL J8 1 SPI CONN HEADER VERT 5POS 2.54 mm for SPI with VCC pin Wurth Electronics MS1, MS2, MS3, MS4 4 M3 screw PAN HEAD SCREW_M3 X 8 MM CROSS SL Wurth Electronics STND1, STND2, STND3, STND4 4 M3 Standoff 15 mm 'Standoffs & Spacers 5.0 HEX 15.0 mm NYLON Keystone Electronics SW1, SW2 2 ENCAN, ENBAT SW, SPT ITT C&K TP1, TP2, TP3, TP4, TP7, TP9, TP10, TP12, TP13 'VBAT, VIN_S, LX1, 9 VREG, VUC, VLDOA, Test Point, Red, Through Hole Mount, VLDOB, VLDOP1, 1.6 mm Keystone Electronics VLDOP2 TP5, TP6, TP8 3 GND Test Point, Black, Through Hole Mount, 1.6 mm Keystone Electronics TP11, TP14, TP15, TP16, TP17, TP18, TP19, TP20, TP21, TP22 NPOR, nERROR, 1 EN, ENCAN, ENBAT, WD_Fn, FFn, AMUXO, Test Point, Yellow, Through Hole Mount, 1.6 mm POE, WD_IN Keystone Electronics X1 1 VBAT Terminal Block, 5.08 mm, Vertical, 2 position TE Connectivity C3 1 DNP CAP CER 0.1 µF 50 V X7R 0805 Murata C9 1 DNP CAP CER 22 µF 25 V X7R 1210 Murata Manufacturer Part Number 297 SV005 61300311121 61300211121 61300511121 97790803111 25512 SDA01H1SBD 5010 5011 5014 282837-2 GCM21BR71H104KA37K GRM32ER71E226ME15L 8 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com RELATED LINKS Product page: https://www.allegromicro.com/en/products/regulate/regulators/multiple-output-regulators/a81411 Datasheet: https://www.allegromicro.com/~/media/files/datasheets/A81411-Datasheet 9 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Revision History Number Date February 10, 2025 1 February 26, 2025 Initial release Updated Features section Description Copyright 2025, Allegro MicroSystems. Allegro MicroSystems reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro's products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro's product can reasonably be expected to cause bodily harm. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. Copies of this document are considered uncontrolled documents. 10 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com