Robotics RB5 Development Kit Hardware User Manual
Copyright© 2020 Thundercomm Technology Co., Ltd. All rights reserved.
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GPIO G: Connects to GPIO_6 of QRB5165 SoC.
GPIO H: Connects to GPIO_116 of QRB5165 SoC.
GPIO I: Connects to GPIO_93 of QRB5165 SoC.
GPIO J: Connects to GPIO_114 of QRB5165 SoC.
GPIO K: Connects to GPIO_92 of QRB5165 SoC.
GPIO L: Connects to GPIO_109 of QRB5165 SoC.
4.1.4 SPI
The 96Boards specification calls for one SPI bus master to be provided on the low-speed
expansion connector.
RB5 implements a full SPI master with 4 wires: CLK, CS, MOSI, and MISO. All signals go
directly to the QRB5165 SoC. These signals are driven at 1.8 V.
4.1.5 PCM/I2S
The 96Boards specification calls for one PCM/I2S bus to be provided on the low-speed
expansion connector.
The CLK, FS, and DO signals are required while the DI is optional.
RB5 implements a PCM/I2S with 4 wires: CLK, FS, D0~D1. The I2S signals are connected
directly to the QRB5165 SoC. These signals are driven at 1.8 V.
4.1.6 Power and Reset
The 96Boards specification calls for a signal on the low-speed expansion connector that
can power on/off the board and a signal that serves as a board reset signal.
RB5 routes the PWR_BTN_N signal to the KYP_DPWR_N pin of the PM8250 PMIC. This
signal is available on the onboard Power ON button switch (see Section 1.2.2, #20). The
button only provides an ON/Sleep function and not OFF functionality.
A mezzanine implementation of this signal should not drive it with any voltage, the only
allowed operation is to force it to GND to start the board from a sleep mode. A board
shutdown will occur when this signal is held to ground for more than 15 seconds.
RB5 routes the RST_BTN_N (named PM_RESIN_N on the Robotics RB5 Development Kit
schematic) signal to the RESIN_N pin of the PM8250 PMIC. This signal is driven by SW1302,
the onboard reset switch (see Section 1.2.2, #17). This signal is dual purpose, the default
purpose is Volume down, and the second purpose is the Reset function which needs the
software configure setting.
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