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Hardware Overview
Table 2-1. DRV3946-Q1EVM Detailed Description of Components (continued)
Component
2.1 Connectors and Configuration Headers
The main power connector J14 (I) is where the VBAT supply is connected. The maximum current the connector
can withstand before damage or malfunction occurs is 20 A. To prevent potential damage to the board, ensure
that the supply current does not exceed 20 A. If the current does exceed 20 A, the included 20-A fuse should
protect the board. Protection should not soley rely on the fuse. TI recommends limiting the supply current to
below 20 A to further protect the board.
The output connectors J2, J3, J21, and J8 (L) are the same as the J14 (I) main power connector. The DRV3946-
Q1 is able to drive up to 9 A per channel, the maximum current expected for each connector is 9 A.
The IPROPIx_y headers (A) select the IPROPI resistor for each driver output. See the data sheet for the full list
of suitable IPROPI resistor values. To minimize the board area, only select resistor values are included in the
header. If the user desires to use a resistor value that is not listed in the header, the resistor can be soldered to
the DNP footprint.
Table 2-2
Header Pins
The NAD_FAULT_x headers select the NAD_FAULT resistor values. By default, 8.7 kΩ is chosen for driver A
and 22 kΩ is chosen for driver B. See the data sheet for more information about the NAD_FAULT resistors and
their functions.
Table 2-3
4
DRV3946-Q1EVM User's Guide
D
E
F
G
H
I
J
lists the available IPROPI resistor values in the EVM.
Table 2-2. IPROPI Resistor Selector Headers Values
1-2
3-4
5-6
7-8
9-10
11-12
13-14
15-16
17-18
19-20
lists the available NAD_FAULT resistor values for each header.
Copyright © 2023 Texas Instruments Incorporated
Description
J7: Header for serial communication signals (RX, TX) and
TDIO/TCK for programming main MCU (U3). Shunts are required
for communication between the main MCU (U3) and the ezFET-LITE
debugger.
J5: EZFET-LITE flashing connector. Leave the header disconnected.
J6: USB connector
STATUS LEDs. Refer to
Main signal header. Refer to
U1: DRV3946-Q1 Driver A
J2: Driver A OUT1 and PVDD connector
J3: Driver A OUT2 and PVDD connector
Reverse battery protection, fuse, and EMI filter circuit
Main power supply (VBAT) connector
U8: DRV3946-Q1 Driver B
J8: Driver B OUT1 and PVDD connector
J21: Driver BOUT2 and PVDD connector
Resistor Value to GND
4.7 kΩ
5.6 kΩ
6.8 kΩ
8.25 kΩ
10 kΩ
12 kΩ
15 kΩ
18 kΩ
20 kΩ
DNP
www.ti.com
Section 2.3
Section 2.2
SLVUCC8 – OCTOBER 2021
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