SLVUBX4A November   2020  – February 2022 LP8764-Q1

 

  1.   Trademarks
  2. 1Introduction
  3. 2Getting Started
    1. 2.1 Getting Started: Single EVM
    2. 2.2 Getting Started: Multiple EVM Evaluation
    3. 2.3 GUI Tool
  4. 3EVM Details
    1. 3.1 Terminal Blocks
    2. 3.2 Test Point Descriptions
    3. 3.3 Configuration Headers
    4. 3.4 Stack-up Headers
    5. 3.5 Connectors
    6. 3.6 Dip Switches
    7. 3.7 EVM Control and GPIO
  5. 4Customization
    1. 4.1 Changing the Communication Interface
    2. 4.2 Changing the Phase Configuration
  6. 5Schematic, Layout, and Bill of Materials
  7. 6Additional Resources
  8. 7Revision History

3.3 Configuration Headers

There are four headers available to configure the EVM function. Header J22 configures controller and target mode of operation. Header J20, as shown in the silk screen picture in Figure 3-1, is used to configure the EVM to match the feature setting written to the LP8764x-Q1 configuration registers. J32 is used to select the PMIC IO voltage, either 1.8 V or 3.3 V. The fifth header is J25 which allows VCCA to be powered from the USB connection and the configuration of GPIO2, I2C2 or SPI.

Figure 3-1 EVM Header J20
Table 3-3 Header J20 Description
Option PinsConfigurationDescription
SPI_ENOpen (Default)I2C Mode. The signal path for I2C communication between the MCU and the PMIC is enabled.
ClosedSPI mode. The signal path for SPI communication between the MCU and the PMIC is enabled.
GPIO3, SDA2/SDOOpen (Default)GPIO mode. GPIO2 from PMIC is connected to PM7 of the MCU through a level translator.
GPIO3,SDA2/SDO: ClosedI2C Mode (J20 VIO, I2C/SPI: Open)Q&A Watchdog mode. GPIO3 of the PMIC should be in the Alternative function to support the Q&A Watchdog and the I2C mode is selected. This setting should also be done on connector J25 by closing GPIO2 to SCL2/CS if I2C2 is wanted to be used.
SPI mode (J20 VIO, I2C/SPI: Closed)SPI mode, Chip Select. GPIO2 and GPIO3 of the PMIC should be in the Alternative function to support SPI communication. This setting should also be done on connector J25 by closing GPIO2 to SCL2/CS if I2C2 is wanted to be used.
GPIO6, nERR_MCU, GPIO7Open (Default)GPIO mode. GPIO6 of the PMIC is connected to PP5 of the through a level translator.
GPIO6, nERR_MCU Closed

System error count down input signal from the MCU. VIO Select must be 3.3 V. GPIO6 or GPIO7 of the PMIC should be in the Alternative function to support the system error count down from the MCU.
nERR_MCU, GPIO7 Closed
GPIO2, TRIG_WDG, GPIO4Open (Default)GPIO mode. GPIO7 of the PMIC is connected to PH0 of the through a level translator.
GPIO2, TRIG_WDG Closed

Trigger signal for trigger mode watchdog. VIO Select must be 3.3 V. GPIO7 or GPIO6 of the PMIC should be in the Alternative function to support the trigger mode watchdog signal.
TRIG_WDG, GPIO4 Closed
Table 3-4 Header J32 VIO Voltage Select
ConfigurationDescription
OpenNot Allowed for single or controller EVM, 1.8 V or 3.3 V must be selected. Leave open on target EVM.
VIO Select, 3.3 V: Closed (Default)VIO is 3.3 V.
VIO Select, 1.8 V: ClosedVIO is 1.8 V.
Table 3-5 Header J25, VCCA, GPIO2/I2C/SPI
ConfigurationDescription
3.3V, VCCA: Closed (Default)3.3 V from TLV733P-Q1 (U11) is connected to VCCA. The input for U11 is the 5 V from the USB connection (VBUS). VBUS is not intended to support heavy load conditions. 2 W should be the maximum power drawn from the USB.
EN_5V0, 3.3V, VCCA, 5.0V OpenOn board 5V regulator is disabled and VCCA isolated from other on board supplies. VCCA should be powered from J9.
EN_5V0, 3.3V: Closed 5V on board regulator (powered from USB) is enabled. 5V regulated supply can be used to power VCCA.
VCCA, 5.0V: Closed 5V on board regulator (powered from USB) is connected to the LP8764-Q1 VCCA. 5V on board regulator is not intended for heavy load condition.
SCL2/CS, GPIO2: OpenGPIO mode. GPIO2 of the PMIC is connected to IO2 of the MCU.
SCL2/CS, GPIO2: Closed (Default)I2C mode (J22 SPI_EN: Open)Q&A Watchdog mode. GPIO2 and GPIO3 of the PMIC should be in the Alternative function to support the Q&A Watchdog and the I2C mode selected. This setting should also be done on connector J20 by closing GPIO3 to SDA2/SDO if I2C2 is wanted to be used.
SPI mode (J22 SPI_EN: Closed)SPI mode, Chip Select. GPIO2 and GPIO3 of the PMIC should be in the Alternative function to support SPI communication. This setting should also be done on connector J20 by closing GPIO3 to SDA2/SDO.
Note:

The PMIC device can be configured for a power good level of 3.3 V or 5.0 V for the VCCA pin. If VCCA_VMON feature is enabled please check that the input voltage is correct and use sense connection to compensate IR voltage drop with heavy load currents. Align the VCCA/3.3V/5.0V jumper with the PMIC configuration. The default PMIC configuration supports the whole recommended VCCA voltage range.