SLVUC03 November   2022

 

  1.   Abstract
  2.   Trademarks
  3. 1About this Manual
  4. 2Information About Cautions and Warnings
  5. 3Items Required for Operation
  6. 4Introduction
  7. 5Setup
    1. 5.1 Switch, Push Button, Connector, and Test Points Descriptions
    2. 5.2 Jumper Configuration
  8. 6Schematics
    1. 6.1 Main Schematic
    2. 6.2 Sub Schematic – Input Circuit
    3. 6.3 Sub Schematic – Auxiliary Power
    4. 6.4 Sub Schematic – I2C Peripherals
    5. 6.5 Sub Schematic – TPS55288-Q1
    6. 6.6 Sub Schematic – HUB
    7. 6.7 Sub Schematic – TIVA
    8. 6.8 Sub Schematic – ESD
  9. 7 Board Views and Layout Prints
  10. 8Bill of Materials

5.2 Jumper Configuration

This section describes the configuration of main jumpers. You can configure the jumpers according to your application.

J1 NTC Header

The J1 header is used to verify the thermal foldback function. The NTC pin actually detects the voltage of external NTC circuit, it can be connected to thermistor(NTC or PTC) divider or NTC_VAR. NTC_VAR is the output of TPL0102, which is a I2C digital potentiometer. If you are sure what type of thermistor to be used on your system, you can put the thermistor and resistor divider on our EVM board to test the thermal foldback function. If you can use I2C to control the output of TPL0102, you can connect to NTC_VAR.Or you can directly apply an external voltage to NTC contact pin without any jumper. The thermistor assembled on the EVM is positive temperature coefficient(PTC).

GUID-20221012-SS0I-S2MQ-SVHZ-CFXXHCL4BGT3-low.pngFigure 5-1 J1 NTC Header

J6 I2C MUX

This header expands the I2C1 connections of TPS25762/72-Q1: it can connect to GPIO expander, I2C temperature sensor and EEPROM. Since I2C bus can support multiple slaves, it is recommended to connect all pins.

GUID-20221012-SS0I-6XCG-WMXG-2QVGQKCGX3H0-low.pngFigure 5-2 J6 I2C MUX

J7 TVSP Connector

Figure 5-3 shows the J7 connector schematic. J7 is the jumper for connecting the TVSP pin to a different resistor. The resistance between the TVSP pin and PGND determines the boot mode, USB PD port I2C addresses and I2C logic thresholds, you can get more details through the TPS25762/72-Q1 data sheet. Default open corresponds to EEPROM boot mode and 0x22/0x26 I2C address for port A/B. For firmware update mode, connect a shunt on the pins 15 and 16 of J7.

In order to support USB connector pin short to VBUS or VBAT protection, it is recommended to connect an RC circuit on TVSP pin as shown in Figure 5-4 .

GUID-20221012-SS0I-WNJH-QJVS-BZ2LHRVFQ4NB-low.png Figure 5-3 J7 TVSP Connector
GUID-20221012-SS0I-HD5N-HQJQ-NXWZD5B8KGCT-low.png Figure 5-4 TVSP Damper Network

J8 USB2ANY Connector, J9 I2C MUX, and J10 Aardvark Connector

J8 and J10 are the I2C connectors for USB2ANY and Aardvark tools. J9 is I2C mux for USB2ANY and Aardvark. The I2C from USB2ANY or Aardvark can be configured to connected to I2C1, I2C2, and I2C3. Since I2C bus can support multiple slaves, it is recommended to connect all pins.

GUID-20221012-SS0I-DDSS-QL88-X3P6BKQQVZHX-low.png Figure 5-5 Connectors and MUX for USB2ANY and Aardvark

J14 External VCONN and Auxiliary Power Enable Connector

J14 is used to choose VCONN source and enable external 5 V, 3.3 V and 1.1 V auxiliary power. 3.3 V and 1.1 V voltage are power source of HUB and TIVA. To make sure the EVM board have full function, we recommend connecting all pins of J14. Schematic is shown in Figure 6-5

J15 DITH/SYNC Connector

J15 is dithering or synchronous selector for TPS55288-Q1. DITH/SYNC pin can be configured to connect to C75 to set a dithering frequency or connect to TPS25762/72-Q1 SYNC output to synchronize the switching frequency.

GUID-20221012-SS0I-DQSV-JV93-3FL2DDGQVF8L-low.png Figure 5-6 J15 DITH/SYNC Connector

J18/J19 GPIO9 configuration

J18 and J19 is used to configure the GPIO9 according to the function of GPIO9 pin.J18 is the header used to configure GPIO9 as an interrupt I/O for I2C. J19 is the header used to configure GPIO9 as an enable signal or discharge signal for Port B.

GUID-20221012-SS0I-8GHN-R1NT-K7J3CDLJQZRM-low.png Figure 5-7 J18/J19 GPIO9 Configuration

J20 Enable Signal for TPS55288-Q1

J20 is the header to configure the enable signal of TPS55288-Q1. The default enable signal is the 3.3V LDO from TPS25772-Q1. It can be configured to GPIO9 or external enable signal as needed.

GUID-20221012-SS0I-V19H-1NBK-H3BBGZT4QPNP-low.png Figure 5-8 J20 Enable Signal for TPS55288-Q1